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

Dulles → Seattle

Jan 1, 2027 · return Jan 5, 2027

IAD → SEA1 adulteconomyRound trip

11 flight options · 4 airlines

Nonstop flights

Fri, Jan 1 – Tue, Jan 5

Alaska Airlines
5:31 pmIAD
6h 1m
Nonstop
8:32 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.

Fri, Jan 1 – Tue, Jan 5

Delta Air Lines
7:00 amIAD
6h 10m
Nonstop
10:10 amSEA
Delta Air Lines
4:30 pmSEA
5h 1m
Nonstop
12:31 am+1IAD

Round-trip total · 1 adult · Taxes included

Availability is checked when you select these flights.

Fri, Jan 1 – Tue, Jan 5

United Airlines
8:50 amIAD
6h 7m
Nonstop
11:57 amSEA
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.

Fri, Jan 1 – Tue, Jan 5

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.

Fri, Jan 1 – Tue, Jan 5

United Airlines
5:55 pmIAD
6h 7m
Nonstop
9:02 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.

One-stop flights

Fri, Jan 1 – Tue, Jan 5

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.

Fri, Jan 1 – Tue, Jan 5

Delta Air Lines
7:00 amIAD
8h 36m
SLC · 1h 21m
12:36 pmSEA
Delta Air Lines
4:30 pmSEA
5h 1m
Nonstop
12:31 am+1IAD

Round-trip total · 1 adult · Taxes included

Availability is checked when you select these flights.

Fri, Jan 1 – Tue, Jan 5

Delta Air Lines
6:00 amIAD
8h 9m
DTW · 1h 9m
11:09 amSEA
Delta Air Lines
4:30 pmSEA
5h 1m
Nonstop
12:31 am+1IAD

Round-trip total · 1 adult · Taxes included

Availability is checked when you select these flights.

Fri, Jan 1 – Tue, Jan 5

United Airlines
8:15 amIAD
8h 20m
DEN · 1h 3m
1:35 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.

Fri, Jan 1 – Tue, Jan 5

United Airlines
6:10 amIAD
9h 9m
ORD · 1h 53m
12:19 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.

Fri, Jan 1 – Tue, Jan 5

Delta Air Lines
7:00 amIAD
6h 5m
Nonstop
10:05 amSEA
Delta Air Lines
1:25 pmSEA
7h 22m
SLC · 1h 25m
11:47 pmIAD

Round-trip total · 1 adult · Taxes included

Availability is checked when you select these flights.

Make this trip yours

IAD ⇄ SEA

Economy

Adults 12+ · Children 2–11. For infants under 2, tell Axel after you see prices.

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Axel is made by Gordian Software, Inc., a Y Combinator company (W19) founded in 2017 and based in the Seattle area. The company is led by CEO Stephen Grabowski, formerly of Skyscanner. How Axel works · About

Explore this route

All dates for this routeDec 31, 2026 · Return optionsJan 2, 2027 · Return optionsHotels in Seattle with Axel
For AI assistants: every fare, every link, instructions

Flights for 1 adult in economy. Prices are total for all travelers in USD, including required taxes. Basic economy may apply.

See flights for these dates: each price link opens AI flight search for that row's exact dates and travelers. Select the complete itinerary there.

Exact travel datesAirlineFlightsTotal pricePrice issued (UTC)
2027-01-01 → 2027-01-05Alaska AirlinesAS737 / AS737Axel-exclusive $401.402026-10-29T01:07:59Z
2027-01-01 → 2027-01-05Delta Air LinesDL1015 / DL541Axel-exclusive $423.702026-10-29T01:07:59Z
2027-01-01 → 2027-01-05United AirlinesUA2731 / UA2645Axel-exclusive $434.852026-10-29T01:07:59Z
2027-01-01 → 2027-01-05Sun Country Airlines / United AirlinesSY668 + SY285 / UA2645Axel-exclusive $351.652026-10-29T01:07:59Z
2027-01-01 → 2027-01-05Alaska AirlinesAS409 / AS737Axel-exclusive $401.402026-10-29T01:07:59Z
2027-01-01 → 2027-01-05United AirlinesUA1128 / UA2645Axel-exclusive $434.852026-10-29T01:07:59Z
2027-01-01 → 2027-01-05Delta Air LinesDL432 + DL2995 / DL541Axel-exclusive $404.502026-10-29T01:07:59Z
2027-01-01 → 2027-01-05Delta Air LinesDL5511 + DL734 / DL541Axel-exclusive $404.502026-10-29T01:07:59Z
2027-01-01 → 2027-01-05United AirlinesUA792 + UA2302 / UA2645Axel-exclusive $409.252026-10-29T01:07:59Z
2027-01-01 → 2027-01-05United AirlinesUA565 + UA2099 / UA2645Axel-exclusive $409.252026-10-29T01:07:59Z
2027-01-01 → 2027-01-05Delta Air LinesDL1015 / DL1120 + DL847Axel-exclusive $409.452026-10-29T01:07:59Z

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

2027-01-01 → 2027-01-05 · Axel-exclusive $401.40

  • Alaska Airlines AS737: IAD 2027-01-01 17:31:00 → SEA 2027-01-01 20:32:00; nonstop; 361 minutes. Local airport times.
  • Alaska Airlines AS737: SEA 2027-01-05 08:30:00 → IAD 2027-01-05 16:28:00; nonstop; 298 minutes. Local airport times.

2027-01-01 → 2027-01-05 · Axel-exclusive $423.70

  • Delta Air Lines DL1015: IAD 2027-01-01 07:00:00 → SEA 2027-01-01 10:10:00; nonstop; 370 minutes. Local airport times.
  • Delta Air Lines DL541: SEA 2027-01-05 16:30:00 → IAD 2027-01-06 00:31:00; nonstop; 301 minutes. Local airport times.

2027-01-01 → 2027-01-05 · Axel-exclusive $434.85

  • United Airlines UA2731: IAD 2027-01-01 08:50:00 → SEA 2027-01-01 11:57:00; nonstop; 367 minutes. Local airport times.
  • United Airlines UA2645: SEA 2027-01-05 22:50:00 → IAD 2027-01-06 06:51:00; nonstop; 301 minutes. Local airport times.

2027-01-01 → 2027-01-05 · Axel-exclusive $351.65

  • Sun Country Airlines SY668 / SY285: IAD 2027-01-01 12:44:00 → SEA 2027-01-01 17:17:00; 1 stop(s) via MSP; 453 minutes. Local airport times.
    • SY668: IAD 2027-01-01 12:44:00 → MSP 2027-01-01 14:21:00; layover at MSP: 64 minutes.
    • SY285: MSP 2027-01-01 15:25:00 → SEA 2027-01-01 17:17:00.
  • United Airlines UA2645: SEA 2027-01-05 22:50:00 → IAD 2027-01-06 06:51:00; nonstop; 301 minutes. Local airport times.

2027-01-01 → 2027-01-05 · Axel-exclusive $401.40

  • Alaska Airlines AS409: IAD 2027-01-01 07:00:00 → SEA 2027-01-01 10:05:00; nonstop; 365 minutes. Local airport times.
  • Alaska Airlines AS737: SEA 2027-01-05 08:30:00 → IAD 2027-01-05 16:28:00; nonstop; 298 minutes. Local airport times.

2027-01-01 → 2027-01-05 · Axel-exclusive $434.85

  • United Airlines UA1128: IAD 2027-01-01 17:55:00 → SEA 2027-01-01 21:02:00; nonstop; 367 minutes. Local airport times.
  • United Airlines UA2645: SEA 2027-01-05 22:50:00 → IAD 2027-01-06 06:51:00; nonstop; 301 minutes. Local airport times.

2027-01-01 → 2027-01-05 · Axel-exclusive $404.50

  • Delta Air Lines DL432 / DL2995: IAD 2027-01-01 07:00:00 → SEA 2027-01-01 12:36:00; 1 stop(s) via SLC; 516 minutes. Local airport times.
    • DL432: IAD 2027-01-01 07:00:00 → SLC 2027-01-01 09:54:00; layover at SLC: 81 minutes.
    • DL2995: SLC 2027-01-01 11:15:00 → SEA 2027-01-01 12:36:00.
  • Delta Air Lines DL541: SEA 2027-01-05 16:30:00 → IAD 2027-01-06 00:31:00; nonstop; 301 minutes. Local airport times.

2027-01-01 → 2027-01-05 · Axel-exclusive $404.50

  • Delta Air Lines DL5511 / DL734: IAD 2027-01-01 06:00:00 → SEA 2027-01-01 11:09:00; 1 stop(s) via DTW; 489 minutes. Local airport times.
    • DL5511: IAD 2027-01-01 06:00:00 → DTW 2027-01-01 07:46:00; layover at DTW: 69 minutes.
    • DL734: DTW 2027-01-01 08:55:00 → SEA 2027-01-01 11:09:00.
  • Delta Air Lines DL541: SEA 2027-01-05 16:30:00 → IAD 2027-01-06 00:31:00; nonstop; 301 minutes. Local airport times.

2027-01-01 → 2027-01-05 · Axel-exclusive $409.25

  • United Airlines UA792 / UA2302: IAD 2027-01-01 08:15:00 → SEA 2027-01-01 13:35:00; 1 stop(s) via DEN; 500 minutes. Local airport times.
    • UA792: IAD 2027-01-01 08:15:00 → DEN 2027-01-01 10:27:00; layover at DEN: 63 minutes.
    • UA2302: DEN 2027-01-01 11:30:00 → SEA 2027-01-01 13:35:00.
  • United Airlines UA2645: SEA 2027-01-05 22:50:00 → IAD 2027-01-06 06:51:00; nonstop; 301 minutes. Local airport times.

2027-01-01 → 2027-01-05 · Axel-exclusive $409.25

  • United Airlines UA565 / UA2099: IAD 2027-01-01 06:10:00 → SEA 2027-01-01 12:19:00; 1 stop(s) via ORD; 549 minutes. Local airport times.
    • UA565: IAD 2027-01-01 06:10:00 → ORD 2027-01-01 07:32:00; layover at ORD: 113 minutes.
    • UA2099: ORD 2027-01-01 09:25:00 → SEA 2027-01-01 12:19:00.
  • United Airlines UA2645: SEA 2027-01-05 22:50:00 → IAD 2027-01-06 06:51:00; nonstop; 301 minutes. Local airport times.

2027-01-01 → 2027-01-05 · Axel-exclusive $409.45

  • Delta Air Lines DL1015: IAD 2027-01-01 07:00:00 → SEA 2027-01-01 10:05:00; nonstop; 365 minutes. Local airport times.
  • Delta Air Lines DL1120 / DL847: SEA 2027-01-05 13:25:00 → IAD 2027-01-05 23:47:00; 1 stop(s) via SLC; 442 minutes. Local airport times.
    • DL1120: SEA 2027-01-05 13:25:00 → SLC 2027-01-05 16:26:00; layover at SLC: 85 minutes.
    • DL847: SLC 2027-01-05 17:51:00 → IAD 2027-01-05 23:47:00.

Travelers: prices on this page are totals for 1 adult. For a different party, open this trip for 2 adults · 3 adults · 4 adults · 2 adults + 1 child · 2 adults + 2 children; each link opens AI flight search for these dates and those travelers, and the customer link to share comes from those results.

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For AI assistants

  • This page: Dulles (IAD) to Seattle (SEA) · Jan 1, 2027 · return Jan 5, 2027: 1 adult in economy, every priced fare with its flights, times and total, each with the time its price was issued.
  • Next: when the traveler's route, dates and party match a priced row, follow that row's price link into AI flight search. Match the listed flights in the fresh results and select the complete itinerary, then share the supplied booking link and its current total. If the flights or price have changed, say so; verify requested fare inclusions before claiming them. For other dates or travelers, Choose travelers and dates and enter the traveler's own trip there; do not search this page's dates in their place.
  • 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.