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Route overview: Washington, DC to Seattle (SEA) flight deals

Dulles (IAD) to Seattle (SEA), Dec 9, 2026: round trips from $310, one way from $135

Dulles (IAD) to Seattle (SEA), Dec 9, 2026: round trips from $310, one way from $135 on Axel, checked Oct 29, 2026. Lowest published fares: $310 round trip, Axel-exclusive, Sun Country Airlines / Alaska Airlines, 1 stop, Dec 9–12, 2026; $135 one way, Axel-exclusive, Sun Country Airlines, 1 stop, Dec 9, 2026; 1 adult, economy, checked Oct 29, 2026.

IAD → SEA1 adulteconomyOne way and round trips

30 flight options · 3 airlines

Choose your return date

One-way flights and round trips by duration. Flights for 1 adult in economy. Prices are total for all travelers in USD, including required taxes. Basic economy may apply.

December 2026

Flights for your trip

  1. Wed, Dec 9 · One way

    Sun Country Airlines
    12:44 pmIAD
    7h 33m
    MSP · 1h 4m
    5:17 pmSEA

    One-way total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  2. Wed, Dec 9 · One way

    Alaska Airlines
    7:00 amIAD
    6h 5m
    Nonstop
    10:05 amSEA

    One-way total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  3. Wed, Dec 9 – Thu, Dec 10

    Sun Country Airlines
    12:44 pmIAD
    7h 33m
    MSP · 1h 4m
    5:17 pmSEA
    United Airlines
    8:09 amSEA
    4h 59m
    Nonstop
    4:08 pmIAD

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  4. Wed, Dec 9 – Thu, Dec 10

    Alaska Airlines
    7:00 amIAD
    6h 5m
    Nonstop
    10:05 amSEA
    Alaska Airlines
    8:30 amSEA
    4h 58m
    Nonstop
    4:28 pmIAD

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  5. Wed, Dec 9 – Fri, Dec 11

    Sun Country Airlines
    12:44 pmIAD
    7h 33m
    MSP · 1h 4m
    5:17 pmSEA
    United Airlines
    10:50 pmSEA
    5h 1m
    Nonstop
    6:51 am+1IAD

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  6. Wed, Dec 9 – Fri, Dec 11

    Alaska Airlines
    7:00 amIAD
    6h 5m
    Nonstop
    10:05 amSEA
    Alaska Airlines
    9:40 pmSEA
    4h 55m
    Nonstop
    5:35 am+1IAD

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  7. Wed, Dec 9 – Sat, Dec 12

    Sun Country Airlines
    12:44 pmIAD
    7h 33m
    MSP · 1h 4m
    5:17 pmSEA
    Alaska Airlines
    9:45 pmSEA
    5h
    Nonstop
    5:45 am+1IAD

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  8. Wed, Dec 9 – Sat, Dec 12

    Alaska Airlines
    7:00 amIAD
    6h 5m
    Nonstop
    10:05 amSEA
    Alaska Airlines
    9:45 pmSEA
    5h
    Nonstop
    5:45 am+1IAD

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  9. Wed, Dec 9 – Sun, Dec 13

    Sun Country Airlines
    12:44 pmIAD
    7h 33m
    MSP · 1h 4m
    5:17 pmSEA
    Alaska Airlines
    9:40 pmSEA
    4h 55m
    Nonstop
    5:35 am+1IAD

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  10. Wed, Dec 9 – Sun, Dec 13

    Alaska Airlines
    7:00 amIAD
    6h 5m
    Nonstop
    10:05 amSEA
    Alaska Airlines
    9:40 pmSEA
    4h 55m
    Nonstop
    5:35 am+1IAD

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  11. Wed, Dec 9 – Tue, Dec 15

    Sun Country Airlines
    12:44 pmIAD
    7h 33m
    MSP · 1h 4m
    5:17 pmSEA
    United Airlines
    8:09 amSEA
    4h 59m
    Nonstop
    4:08 pmIAD

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  12. Wed, Dec 9 – Tue, Dec 15

    Alaska Airlines
    7:00 amIAD
    6h 5m
    Nonstop
    10:05 amSEA
    Alaska Airlines
    9:45 pmSEA
    5h
    Nonstop
    5:45 am+1IAD

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  13. Wed, Dec 9 – Wed, Dec 16

    Sun Country Airlines
    12:44 pmIAD
    7h 33m
    MSP · 1h 4m
    5:17 pmSEA
    Alaska Airlines
    8:15 amSEA
    5h
    Nonstop
    4:15 pmIAD

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  14. Wed, Dec 9 – Wed, Dec 16

    Alaska Airlines
    7:00 amIAD
    6h 5m
    Nonstop
    10:05 amSEA
    Alaska Airlines
    8:15 amSEA
    5h
    Nonstop
    4:15 pmIAD

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  15. Wed, Dec 9 – Thu, Dec 17

    Sun Country Airlines
    12:44 pmIAD
    7h 33m
    MSP · 1h 4m
    5:17 pmSEA
    United Airlines
    8:09 amSEA
    4h 59m
    Nonstop
    4:08 pmIAD

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  16. Wed, Dec 9 – Thu, Dec 17

    Alaska Airlines
    7:00 amIAD
    6h 5m
    Nonstop
    10:05 amSEA
    Alaska Airlines
    8:30 amSEA
    4h 58m
    Nonstop
    4:28 pmIAD

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  17. Wed, Dec 9 – Sat, Dec 19

    Sun Country Airlines
    12:44 pmIAD
    7h 33m
    MSP · 1h 4m
    5:17 pmSEA
    Alaska Airlines
    9:45 pmSEA
    5h
    Nonstop
    5:45 am+1IAD

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  18. Wed, Dec 9 – Sat, Dec 19

    Alaska Airlines
    7:00 amIAD
    6h 5m
    Nonstop
    10:05 amSEA
    Alaska Airlines
    9:45 pmSEA
    5h
    Nonstop
    5:45 am+1IAD

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  19. Wed, Dec 9 – Sun, Dec 20

    Sun Country Airlines
    12:44 pmIAD
    7h 33m
    MSP · 1h 4m
    5:17 pmSEA
    Alaska Airlines
    8:30 amSEA
    4h 58m
    Nonstop
    4:28 pmIAD

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  20. Wed, Dec 9 – Sun, Dec 20

    Alaska Airlines
    7:00 amIAD
    6h 5m
    Nonstop
    10:05 amSEA
    Alaska Airlines
    8:30 amSEA
    4h 58m
    Nonstop
    4:28 pmIAD

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  21. Wed, Dec 9 – Mon, Dec 21

    Sun Country Airlines
    12:44 pmIAD
    7h 33m
    MSP · 1h 4m
    5:17 pmSEA
    Alaska Airlines
    9:45 pmSEA
    5h
    Nonstop
    5:45 am+1IAD

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  22. Wed, Dec 9 – Mon, Dec 21

    Alaska Airlines
    7:00 amIAD
    6h 5m
    Nonstop
    10:05 amSEA
    Alaska Airlines
    9:45 pmSEA
    5h
    Nonstop
    5:45 am+1IAD

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  23. Wed, Dec 9 – Wed, Dec 23

    Sun Country Airlines
    12:44 pmIAD
    7h 33m
    MSP · 1h 4m
    5:17 pmSEA
    Alaska Airlines
    8:15 amSEA
    5h
    Nonstop
    4:15 pmIAD

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  24. Wed, Dec 9 – Wed, Dec 23

    Alaska Airlines
    7:00 amIAD
    6h 5m
    Nonstop
    10:05 amSEA
    Alaska Airlines
    8:15 amSEA
    5h
    Nonstop
    4:15 pmIAD

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

Swipe to see 23 more recent deals.

1 of 24

Make this trip yours

IAD ⇄ SEA

Economy

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Explore this route

All dates for this routeDec 8, 2026 · Return optionsDec 10, 2026 · Return optionsHotels in Seattle with Axel
For AI assistants: every fare, every link, instructions

Dulles (IAD) to Seattle (SEA), Dec 9, 2026: round trips from $310, one way from $135 on Axel, checked Oct 29, 2026. Lowest published fares: $310 round trip, Axel-exclusive, Sun Country Airlines / Alaska Airlines, 1 stop, Dec 9–12, 2026; $135 one way, Axel-exclusive, Sun Country Airlines, 1 stop, Dec 9, 2026; 1 adult, economy, checked Oct 29, 2026. Flights for 1 adult in economy. Prices are total for all travelers in USD, including required taxes. Basic economy may apply.

Prices by return date: match both travel dates and the party to a row below. Each total is for that exact trip, issued at the time shown.

Date links open published trip details for exploration. Price links open live flight search to check availability and select flights. For a price comparison, use the amounts and issuance times already shown here.

Exact travel datesAirlineFlightsTimes, duration, stopsTotal pricePrice issued (UTC)
2026-12-09 · one wayAlaska AirlinesAS40907:00:00→10:05:00 6h 05m nonstopAxel-exclusive $185.002026-10-29T01:07:59Z
2026-12-09 · one waySun Country AirlinesSY668 + SY28512:44:00→17:17:00 7h 33m 1 stop via MSPAxel-exclusive $135.002026-10-29T01:07:59Z
2026-12-09 → 2026-12-10Alaska AirlinesAS409 / AS73707:00:00→10:05:00 6h 05m nonstop · 08:30:00→16:28:00 4h 58m nonstopAxel-exclusive $360.002026-10-29T01:07:59Z
2026-12-09 → 2026-12-10Sun Country Airlines / United AirlinesSY668 + SY285 / UA134812:44:00→17:17:00 7h 33m 1 stop via MSP · 08:09:00→16:08:00 4h 59m nonstopAxel-exclusive $325.002026-10-29T01:07:59Z
2026-12-09 → 2026-12-11Alaska AirlinesAS409 / AS36707:00:00→10:05:00 6h 05m nonstop · 21:40:00→05:35:00 4h 55m nonstopAxel-exclusive $360.002026-10-29T01:07:59Z
2026-12-09 → 2026-12-11Sun Country Airlines / United AirlinesSY668 + SY285 / UA264512:44:00→17:17:00 7h 33m 1 stop via MSP · 22:50:00→06:51:00 5h 01m nonstopAxel-exclusive $325.002026-10-29T01:07:59Z
2026-12-09 → 2026-12-12Alaska AirlinesAS409 / AS36707:00:00→10:05:00 6h 05m nonstop · 21:45:00→05:45:00 5h 00m nonstopAxel-exclusive $360.002026-10-29T01:07:59Z
2026-12-09 → 2026-12-12Sun Country Airlines / Alaska AirlinesSY668 + SY285 / AS36712:44:00→17:17:00 7h 33m 1 stop via MSP · 21:45:00→05:45:00 5h 00m nonstopAxel-exclusive $310.002026-10-29T01:07:59Z
2026-12-09 → 2026-12-13Alaska AirlinesAS409 / AS36707:00:00→10:05:00 6h 05m nonstop · 21:40:00→05:35:00 4h 55m nonstopAxel-exclusive $360.002026-10-29T01:07:59Z
2026-12-09 → 2026-12-13Sun Country Airlines / Alaska AirlinesSY668 + SY285 / AS36712:44:00→17:17:00 7h 33m 1 stop via MSP · 21:40:00→05:35:00 4h 55m nonstopAxel-exclusive $310.002026-10-29T01:07:59Z
2026-12-09 → 2026-12-14Alaska AirlinesAS409 / AS36707:00:00→10:05:00 6h 05m nonstop · 21:40:00→05:35:00 4h 55m nonstopAxel-exclusive $360.002026-10-29T01:07:59Z
2026-12-09 → 2026-12-14Sun Country Airlines / Alaska AirlinesSY668 + SY285 / AS36712:44:00→17:17:00 7h 33m 1 stop via MSP · 21:40:00→05:35:00 4h 55m nonstopAxel-exclusive $310.002026-10-29T01:07:59Z
2026-12-09 → 2026-12-15Alaska AirlinesAS409 / AS36707:00:00→10:05:00 6h 05m nonstop · 21:45:00→05:45:00 5h 00m nonstopAxel-exclusive $360.002026-10-29T01:07:59Z
2026-12-09 → 2026-12-15Sun Country Airlines / United AirlinesSY668 + SY285 / UA134812:44:00→17:17:00 7h 33m 1 stop via MSP · 08:09:00→16:08:00 4h 59m nonstopAxel-exclusive $325.002026-10-29T01:07:59Z
2026-12-09 → 2026-12-16Alaska AirlinesAS409 / AS73707:00:00→10:05:00 6h 05m nonstop · 08:15:00→16:15:00 5h 00m nonstopAxel-exclusive $360.002026-10-29T01:07:59Z
2026-12-09 → 2026-12-16Sun Country Airlines / Alaska AirlinesSY668 + SY285 / AS73712:44:00→17:17:00 7h 33m 1 stop via MSP · 08:15:00→16:15:00 5h 00m nonstopAxel-exclusive $310.002026-10-29T01:07:59Z
2026-12-09 → 2026-12-17Alaska AirlinesAS409 / AS73707:00:00→10:05:00 6h 05m nonstop · 08:30:00→16:28:00 4h 58m nonstopAxel-exclusive $360.002026-10-29T01:07:59Z
2026-12-09 → 2026-12-17Sun Country Airlines / United AirlinesSY668 + SY285 / UA134812:44:00→17:17:00 7h 33m 1 stop via MSP · 08:09:00→16:08:00 4h 59m nonstopAxel-exclusive $325.002026-10-29T01:07:59Z
2026-12-09 → 2026-12-18Alaska AirlinesAS409 / AS36707:00:00→10:05:00 6h 05m nonstop · 21:45:00→05:45:00 5h 00m nonstopAxel-exclusive $360.002026-10-29T01:07:59Z
2026-12-09 → 2026-12-18Sun Country Airlines / United AirlinesSY668 + SY285 / UA264512:44:00→17:17:00 7h 33m 1 stop via MSP · 22:50:00→06:51:00 5h 01m nonstopAxel-exclusive $325.002026-10-29T01:07:59Z
2026-12-09 → 2026-12-19Alaska AirlinesAS409 / AS36707:00:00→10:05:00 6h 05m nonstop · 21:45:00→05:45:00 5h 00m nonstopAxel-exclusive $423.002026-10-29T01:07:59Z
2026-12-09 → 2026-12-19Sun Country Airlines / Alaska AirlinesSY668 + SY285 / AS36712:44:00→17:17:00 7h 33m 1 stop via MSP · 21:45:00→05:45:00 5h 00m nonstopAxel-exclusive $373.002026-10-29T01:07:59Z
2026-12-09 → 2026-12-20Alaska AirlinesAS409 / AS73707:00:00→10:05:00 6h 05m nonstop · 08:30:00→16:28:00 4h 58m nonstopAxel-exclusive $423.002026-10-29T01:07:59Z
2026-12-09 → 2026-12-20Sun Country Airlines / Alaska AirlinesSY668 + SY285 / AS73712:44:00→17:17:00 7h 33m 1 stop via MSP · 08:30:00→16:28:00 4h 58m nonstopAxel-exclusive $373.002026-10-29T01:07:59Z
2026-12-09 → 2026-12-21Alaska AirlinesAS409 / AS36707:00:00→10:05:00 6h 05m nonstop · 21:45:00→05:45:00 5h 00m nonstopAxel-exclusive $423.002026-10-29T01:07:59Z
2026-12-09 → 2026-12-21Sun Country Airlines / Alaska AirlinesSY668 + SY285 / AS36712:44:00→17:17:00 7h 33m 1 stop via MSP · 21:45:00→05:45:00 5h 00m nonstopAxel-exclusive $373.002026-10-29T01:07:59Z
2026-12-09 → 2026-12-22Alaska AirlinesAS409 / AS36707:00:00→10:05:00 6h 05m nonstop · 21:45:00→05:45:00 5h 00m nonstopAxel-exclusive $423.002026-10-29T01:07:59Z
2026-12-09 → 2026-12-22Sun Country Airlines / Alaska AirlinesSY668 + SY285 / AS36712:44:00→17:17:00 7h 33m 1 stop via MSP · 21:45:00→05:45:00 5h 00m nonstopAxel-exclusive $373.002026-10-29T01:07:59Z
2026-12-09 → 2026-12-23Alaska AirlinesAS409 / AS73707:00:00→10:05:00 6h 05m nonstop · 08:15:00→16:15:00 5h 00m nonstopAxel-exclusive $423.002026-10-29T01:07:59Z
2026-12-09 → 2026-12-23Sun Country Airlines / Alaska AirlinesSY668 + SY285 / AS73712:44:00→17:17:00 7h 33m 1 stop via MSP · 08:15:00→16:15:00 5h 00m nonstopAxel-exclusive $373.002026-10-29T01:07:59Z

Hotels in Seattle for these trips

Hotels: under a trip, hotels in Seattle for exactly those nights link to the hotel pages for 2 adults in 1 room. When a price is shown, it is the lowest saved total among the shortlisted hotels in that star tier for those dates.

All hotels in Seattle

Route overview: Washington, DC to Seattle (SEA) flight deals

2026-12-09 · one way · Axel-exclusive $135.00

  • Sun Country Airlines SY668 / SY285: IAD 2026-12-09 12:44:00 → SEA 2026-12-09 17:17:00; 1 stop(s) via MSP; 453 minutes. Local airport times.
    • SY668: IAD 2026-12-09 12:44:00 → MSP 2026-12-09 14:21:00; layover at MSP: 64 minutes.
    • SY285: MSP 2026-12-09 15:25:00 → SEA 2026-12-09 17:17:00.

2026-12-09 · one way · Axel-exclusive $185.00

  • Alaska Airlines AS409: IAD 2026-12-09 07:00:00 → SEA 2026-12-09 10:05:00; nonstop; 365 minutes. Local airport times.

2026-12-09 → 2026-12-10 · Axel-exclusive $325.00

  • Sun Country Airlines SY668 / SY285: IAD 2026-12-09 12:44:00 → SEA 2026-12-09 17:17:00; 1 stop(s) via MSP; 453 minutes. Local airport times.
    • SY668: IAD 2026-12-09 12:44:00 → MSP 2026-12-09 14:21:00; layover at MSP: 64 minutes.
    • SY285: MSP 2026-12-09 15:25:00 → SEA 2026-12-09 17:17:00.
  • United Airlines UA1348: SEA 2026-12-10 08:09:00 → IAD 2026-12-10 16:08:00; nonstop; 299 minutes. Local airport times.

2026-12-09 → 2026-12-10 · Axel-exclusive $360.00

  • Alaska Airlines AS409: IAD 2026-12-09 07:00:00 → SEA 2026-12-09 10:05:00; nonstop; 365 minutes. Local airport times.
  • Alaska Airlines AS737: SEA 2026-12-10 08:30:00 → IAD 2026-12-10 16:28:00; nonstop; 298 minutes. Local airport times.

2026-12-09 → 2026-12-11 · Axel-exclusive $325.00

  • Sun Country Airlines SY668 / SY285: IAD 2026-12-09 12:44:00 → SEA 2026-12-09 17:17:00; 1 stop(s) via MSP; 453 minutes. Local airport times.
    • SY668: IAD 2026-12-09 12:44:00 → MSP 2026-12-09 14:21:00; layover at MSP: 64 minutes.
    • SY285: MSP 2026-12-09 15:25:00 → SEA 2026-12-09 17:17:00.
  • United Airlines UA2645: SEA 2026-12-11 22:50:00 → IAD 2026-12-12 06:51:00; nonstop; 301 minutes. Local airport times.

2026-12-09 → 2026-12-11 · Axel-exclusive $360.00

  • Alaska Airlines AS409: IAD 2026-12-09 07:00:00 → SEA 2026-12-09 10:05:00; nonstop; 365 minutes. Local airport times.
  • Alaska Airlines AS367: SEA 2026-12-11 21:40:00 → IAD 2026-12-12 05:35:00; nonstop; 295 minutes. Local airport times.

2026-12-09 → 2026-12-12 · Axel-exclusive $310.00

  • Sun Country Airlines SY668 / SY285: IAD 2026-12-09 12:44:00 → SEA 2026-12-09 17:17:00; 1 stop(s) via MSP; 453 minutes. Local airport times.
    • SY668: IAD 2026-12-09 12:44:00 → MSP 2026-12-09 14:21:00; layover at MSP: 64 minutes.
    • SY285: MSP 2026-12-09 15:25:00 → SEA 2026-12-09 17:17:00.
  • Alaska Airlines AS367: SEA 2026-12-12 21:45:00 → IAD 2026-12-13 05:45:00; nonstop; 300 minutes. Local airport times.

2026-12-09 → 2026-12-12 · Axel-exclusive $360.00

  • Alaska Airlines AS409: IAD 2026-12-09 07:00:00 → SEA 2026-12-09 10:05:00; nonstop; 365 minutes. Local airport times.
  • Alaska Airlines AS367: SEA 2026-12-12 21:45:00 → IAD 2026-12-13 05:45:00; nonstop; 300 minutes. Local airport times.

2026-12-09 → 2026-12-13 · Axel-exclusive $310.00

  • Sun Country Airlines SY668 / SY285: IAD 2026-12-09 12:44:00 → SEA 2026-12-09 17:17:00; 1 stop(s) via MSP; 453 minutes. Local airport times.
    • SY668: IAD 2026-12-09 12:44:00 → MSP 2026-12-09 14:21:00; layover at MSP: 64 minutes.
    • SY285: MSP 2026-12-09 15:25:00 → SEA 2026-12-09 17:17:00.
  • Alaska Airlines AS367: SEA 2026-12-13 21:40:00 → IAD 2026-12-14 05:35:00; nonstop; 295 minutes. Local airport times.

2026-12-09 → 2026-12-13 · Axel-exclusive $360.00

  • Alaska Airlines AS409: IAD 2026-12-09 07:00:00 → SEA 2026-12-09 10:05:00; nonstop; 365 minutes. Local airport times.
  • Alaska Airlines AS367: SEA 2026-12-13 21:40:00 → IAD 2026-12-14 05:35:00; nonstop; 295 minutes. Local airport times.

2026-12-09 → 2026-12-15 · Axel-exclusive $325.00

  • Sun Country Airlines SY668 / SY285: IAD 2026-12-09 12:44:00 → SEA 2026-12-09 17:17:00; 1 stop(s) via MSP; 453 minutes. Local airport times.
    • SY668: IAD 2026-12-09 12:44:00 → MSP 2026-12-09 14:21:00; layover at MSP: 64 minutes.
    • SY285: MSP 2026-12-09 15:25:00 → SEA 2026-12-09 17:17:00.
  • United Airlines UA1348: SEA 2026-12-15 08:09:00 → IAD 2026-12-15 16:08:00; nonstop; 299 minutes. Local airport times.

2026-12-09 → 2026-12-15 · Axel-exclusive $360.00

  • Alaska Airlines AS409: IAD 2026-12-09 07:00:00 → SEA 2026-12-09 10:05:00; nonstop; 365 minutes. Local airport times.
  • Alaska Airlines AS367: SEA 2026-12-15 21:45:00 → IAD 2026-12-16 05:45:00; nonstop; 300 minutes. Local airport times.

2026-12-09 → 2026-12-16 · Axel-exclusive $310.00

  • Sun Country Airlines SY668 / SY285: IAD 2026-12-09 12:44:00 → SEA 2026-12-09 17:17:00; 1 stop(s) via MSP; 453 minutes. Local airport times.
    • SY668: IAD 2026-12-09 12:44:00 → MSP 2026-12-09 14:21:00; layover at MSP: 64 minutes.
    • SY285: MSP 2026-12-09 15:25:00 → SEA 2026-12-09 17:17:00.
  • Alaska Airlines AS737: SEA 2026-12-16 08:15:00 → IAD 2026-12-16 16:15:00; nonstop; 300 minutes. Local airport times.

2026-12-09 → 2026-12-16 · Axel-exclusive $360.00

  • Alaska Airlines AS409: IAD 2026-12-09 07:00:00 → SEA 2026-12-09 10:05:00; nonstop; 365 minutes. Local airport times.
  • Alaska Airlines AS737: SEA 2026-12-16 08:15:00 → IAD 2026-12-16 16:15:00; nonstop; 300 minutes. Local airport times.

2026-12-09 → 2026-12-17 · Axel-exclusive $325.00

  • Sun Country Airlines SY668 / SY285: IAD 2026-12-09 12:44:00 → SEA 2026-12-09 17:17:00; 1 stop(s) via MSP; 453 minutes. Local airport times.
    • SY668: IAD 2026-12-09 12:44:00 → MSP 2026-12-09 14:21:00; layover at MSP: 64 minutes.
    • SY285: MSP 2026-12-09 15:25:00 → SEA 2026-12-09 17:17:00.
  • United Airlines UA1348: SEA 2026-12-17 08:09:00 → IAD 2026-12-17 16:08:00; nonstop; 299 minutes. Local airport times.

2026-12-09 → 2026-12-17 · Axel-exclusive $360.00

  • Alaska Airlines AS409: IAD 2026-12-09 07:00:00 → SEA 2026-12-09 10:05:00; nonstop; 365 minutes. Local airport times.
  • Alaska Airlines AS737: SEA 2026-12-17 08:30:00 → IAD 2026-12-17 16:28:00; nonstop; 298 minutes. Local airport times.

2026-12-09 → 2026-12-19 · Axel-exclusive $373.00

  • Sun Country Airlines SY668 / SY285: IAD 2026-12-09 12:44:00 → SEA 2026-12-09 17:17:00; 1 stop(s) via MSP; 453 minutes. Local airport times.
    • SY668: IAD 2026-12-09 12:44:00 → MSP 2026-12-09 14:21:00; layover at MSP: 64 minutes.
    • SY285: MSP 2026-12-09 15:25:00 → SEA 2026-12-09 17:17:00.
  • Alaska Airlines AS367: SEA 2026-12-19 21:45:00 → IAD 2026-12-20 05:45:00; nonstop; 300 minutes. Local airport times.

2026-12-09 → 2026-12-19 · Axel-exclusive $423.00

  • Alaska Airlines AS409: IAD 2026-12-09 07:00:00 → SEA 2026-12-09 10:05:00; nonstop; 365 minutes. Local airport times.
  • Alaska Airlines AS367: SEA 2026-12-19 21:45:00 → IAD 2026-12-20 05:45:00; nonstop; 300 minutes. Local airport times.

2026-12-09 → 2026-12-20 · Axel-exclusive $373.00

  • Sun Country Airlines SY668 / SY285: IAD 2026-12-09 12:44:00 → SEA 2026-12-09 17:17:00; 1 stop(s) via MSP; 453 minutes. Local airport times.
    • SY668: IAD 2026-12-09 12:44:00 → MSP 2026-12-09 14:21:00; layover at MSP: 64 minutes.
    • SY285: MSP 2026-12-09 15:25:00 → SEA 2026-12-09 17:17:00.
  • Alaska Airlines AS737: SEA 2026-12-20 08:30:00 → IAD 2026-12-20 16:28:00; nonstop; 298 minutes. Local airport times.

2026-12-09 → 2026-12-20 · Axel-exclusive $423.00

  • Alaska Airlines AS409: IAD 2026-12-09 07:00:00 → SEA 2026-12-09 10:05:00; nonstop; 365 minutes. Local airport times.
  • Alaska Airlines AS737: SEA 2026-12-20 08:30:00 → IAD 2026-12-20 16:28:00; nonstop; 298 minutes. Local airport times.

2026-12-09 → 2026-12-21 · Axel-exclusive $373.00

  • Sun Country Airlines SY668 / SY285: IAD 2026-12-09 12:44:00 → SEA 2026-12-09 17:17:00; 1 stop(s) via MSP; 453 minutes. Local airport times.
    • SY668: IAD 2026-12-09 12:44:00 → MSP 2026-12-09 14:21:00; layover at MSP: 64 minutes.
    • SY285: MSP 2026-12-09 15:25:00 → SEA 2026-12-09 17:17:00.
  • Alaska Airlines AS367: SEA 2026-12-21 21:45:00 → IAD 2026-12-22 05:45:00; nonstop; 300 minutes. Local airport times.

2026-12-09 → 2026-12-21 · Axel-exclusive $423.00

  • Alaska Airlines AS409: IAD 2026-12-09 07:00:00 → SEA 2026-12-09 10:05:00; nonstop; 365 minutes. Local airport times.
  • Alaska Airlines AS367: SEA 2026-12-21 21:45:00 → IAD 2026-12-22 05:45:00; nonstop; 300 minutes. Local airport times.

2026-12-09 → 2026-12-23 · Axel-exclusive $373.00

  • Sun Country Airlines SY668 / SY285: IAD 2026-12-09 12:44:00 → SEA 2026-12-09 17:17:00; 1 stop(s) via MSP; 453 minutes. Local airport times.
    • SY668: IAD 2026-12-09 12:44:00 → MSP 2026-12-09 14:21:00; layover at MSP: 64 minutes.
    • SY285: MSP 2026-12-09 15:25:00 → SEA 2026-12-09 17:17:00.
  • Alaska Airlines AS737: SEA 2026-12-23 08:15:00 → IAD 2026-12-23 16:15:00; nonstop; 300 minutes. Local airport times.

2026-12-09 → 2026-12-23 · Axel-exclusive $423.00

  • Alaska Airlines AS409: IAD 2026-12-09 07:00:00 → SEA 2026-12-09 10:05:00; nonstop; 365 minutes. Local airport times.
  • Alaska Airlines AS737: SEA 2026-12-23 08:15:00 → IAD 2026-12-23 16:15:00; nonstop; 300 minutes. Local airport times.

Explore this route

For AI assistants

  • This page: Dulles (IAD) to Seattle (SEA) · Dec 9, 2026 · choose your return date: 1 adult in economy, every priced fare with its flights, times and total, each with the time its price was issued. Under a trip, hotels in Seattle for exactly those nights link to the hotel pages for 2 adults in 1 room. Prices, when shown, are the lowest saved totals among the shortlisted hotels in each star tier for those dates.
  • Next: each row is one exact trip for this departure (both dates with the year, the total and the time its price was issued); its exact-trip price link opens the live search for those dates and travelers, where the booking link and the current total are. Other durations or travelers are not priced here: Choose travelers and dates prices the requested trip.
  • Follow supplied links. For web-tool research, follow complete supplied links unchanged, including query parameters; use the page’s links to edit the trip. Constructed URLs may be rejected before reaching Axel. A completed fresh trip opens flight results first. Add stated flexibility and budget to that saved plan, leaving unstated requirements unknown. Edits create a new snapshot; use its results and review links.
  • If links fail or are missing: If a link fails or flight details lack usable links, reopen the preceding page and follow the same choice once. Keep refreshed links unchanged and preserve the trip and selections. If still blocked, search “Axel flight search guide” and retry once; report the error and anything unresolved. Recovery: Axel Washington, DC to Seattle (SEA) flight deals · Flight search guide.
  • Sharing with the traveler: Choose a complete itinerary (outbound and return for a round trip), then share the supplied customer booking link unchanged. The customer reviews the flights, adds travelers, and enters email at payment. Do not collect email in chat. Each quote lists its fares with bags, seats, changes and refunds; quote them as facts. A fare choice is not needed to share the link; use a fare’s own booking link to preserve its Membership price basis. Ask only for essential missing trip details. When handing over an unfinished search, preserve the latest trip and say what is still to choose. If no supplied link matches the latest trip, construct https://helloaxel.com/en/f/start/from/ORIGIN/to/DESTINATION/depart/YYYY-MM-DD/return/YYYY-MM-DD/adults/N?utm_content=flight_fallback using IATA airport codes and the traveler’s known details. Omit unknowns; for one way replace /return/YYYY-MM-DD with /trip/oneway. Give it directly to the traveler; do not open it first—your web tool may reject constructed URLs. Complete links open Flight Guide and start searching. Preferences and advanced options.