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Dulles → Seattle

Dec 21, 2026 · return Jan 4, 2027

IAD → SEA1 adulteconomyRound trip

11 flight options · 3 airlines

Nonstop flights

Mon, Dec 21 – Mon, Jan 4

Alaska Airlines
5:31 pmIAD
6h 1m
Nonstop
8:32 pmSEA
Alaska Airlines
9:40 pmSEA
4h 55m
Nonstop
5:35 am+1IAD

Round-trip total · 1 adult · Taxes included

Mon, Dec 21 – Mon, Jan 4

Delta Air Lines
7:00 amIAD
6h 5m
Nonstop
10:05 amSEA
Delta Air Lines
4:30 pmSEA
4h 50m
Nonstop
12:20 am+1IAD

Round-trip total · 1 adult · Taxes included

Mon, Dec 21 – Mon, Jan 4

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

Mon, Dec 21 – Mon, Jan 4

Alaska Airlines
7:46 amIAD
5h 50m
Nonstop
10:36 amSEA
Alaska Airlines
9:40 pmSEA
4h 55m
Nonstop
5:35 am+1IAD

Round-trip total · 1 adult · Taxes included

Mon, Dec 21 – Mon, Jan 4

United Airlines
5:55 pmIAD
6h 6m
Nonstop
9:01 pmSEA
United Airlines
10:50 pmSEA
5h 1m
Nonstop
6:51 am+1IAD

Round-trip total · 1 adult · Taxes included

One-stop flights

Mon, Dec 21 – Mon, Jan 4

Alaska Airlines
7:05 amIAD
5h 55m
Nonstop
10:00 amSEA
Alaska Airlines
12:30 amSEA
7h 53m
DFW · 1h 10m
11:23 amIAD

Round-trip total · 1 adult · Taxes included

Mon, Dec 21 – Mon, Jan 4

Delta Air Lines
7:00 amIAD
6h 10m
Nonstop
10:10 amSEA
Delta Air Lines
6:00 amSEA
7h 18m
DTW · 1h 33m
4:18 pmIAD

Round-trip total · 1 adult · Taxes included

Mon, Dec 21 – Mon, Jan 4

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

Mon, Dec 21 – Mon, Jan 4

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

Mon, Dec 21 – Mon, Jan 4

United Airlines
6:10 amIAD
9h 51m
EWR · 2h 12m
1:01 pmSEA
United Airlines
10:50 pmSEA
5h 1m
Nonstop
6:51 am+1IAD

Round-trip total · 1 adult · Taxes included

Mon, Dec 21 – Mon, Jan 4

United Airlines
5:55 pmIAD
6h 7m
Nonstop
9:02 pmSEA
United Airlines
5:00 amSEA
7h 44m
DEN · 1h 39m
3:44 pmIAD

Round-trip total · 1 adult · Taxes included

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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More dates

All dates for this routeNov 24, 2026 → Nov 29, 2026Dec 22, 2026 → Dec 27, 2026Dec 30, 2026 → Jan 2, 2027Jan 15, 2027 → Jan 18, 2027Oct 30, 2026 → Nov 2, 2026Oct 31, 2026 → Nov 7, 2026Nov 27, 2026 → Nov 30, 2026Nov 28, 2026 → Dec 5, 2026Dec 25, 2026 → Dec 28, 2026Dec 26, 2026 → Jan 2, 2027Jan 22, 2027 → Jan 25, 2027Oct 30, 2026 · One way
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.

Exact travel datesAirlineFlightsTotal pricePrice issued (UTC)
2026-12-21 → 2027-01-04Alaska AirlinesAS737 / AS367$473.402026-10-29T01:07:59Z
2026-12-21 → 2027-01-04Delta Air LinesDL1015 / DL541$499.702026-10-29T01:07:59Z
2026-12-21 → 2027-01-04United AirlinesUA2731 / UA2645$512.852026-10-29T01:07:59Z
2026-12-21 → 2027-01-04Alaska AirlinesAS409 / AS367$473.402026-10-29T01:07:59Z
2026-12-21 → 2027-01-04United AirlinesUA1128 / UA2645$512.852026-10-29T01:07:59Z
2026-12-21 → 2027-01-04Alaska AirlinesAS409 / AS424 + AA3320$454.202026-10-29T01:07:59Z
2026-12-21 → 2027-01-04Delta Air LinesDL1015 / DL812 + DL5413$480.502026-10-29T01:07:59Z
2026-12-21 → 2027-01-04United AirlinesUA565 + UA2099 / UA2645$485.852026-10-29T01:07:59Z
2026-12-21 → 2027-01-04United AirlinesUA792 + UA2302 / UA2645$485.852026-10-29T01:07:59Z
2026-12-21 → 2027-01-04United AirlinesUA1359 + UA1330 / UA2645$485.852026-10-29T01:07:59Z
2026-12-21 → 2027-01-04United AirlinesUA1128 / UA2601 + UA2087$487.252026-10-29T01:07:59Z

2026-12-21 → 2027-01-04 · $473.40

  • Alaska Airlines AS737: IAD 2026-12-21 17:31:00 → SEA 2026-12-21 20:32:00; nonstop; 361 minutes. Local airport times.
  • Alaska Airlines AS367: SEA 2027-01-04 21:40:00 → IAD 2027-01-05 05:35:00; nonstop; 295 minutes. Local airport times.

2026-12-21 → 2027-01-04 · $499.70

  • Delta Air Lines DL1015: IAD 2026-12-21 07:00:00 → SEA 2026-12-21 10:05:00; nonstop; 365 minutes. Local airport times.
  • Delta Air Lines DL541: SEA 2027-01-04 16:30:00 → IAD 2027-01-05 00:20:00; nonstop; 290 minutes. Local airport times.

2026-12-21 → 2027-01-04 · $512.85

  • United Airlines UA2731: IAD 2026-12-21 08:50:00 → SEA 2026-12-21 11:57:00; nonstop; 367 minutes. Local airport times.
  • United Airlines UA2645: SEA 2027-01-04 22:50:00 → IAD 2027-01-05 06:51:00; nonstop; 301 minutes. Local airport times.

2026-12-21 → 2027-01-04 · $473.40

  • Alaska Airlines AS409: IAD 2026-12-21 07:46:00 → SEA 2026-12-21 10:36:00; nonstop; 350 minutes. Local airport times.
  • Alaska Airlines AS367: SEA 2027-01-04 21:40:00 → IAD 2027-01-05 05:35:00; nonstop; 295 minutes. Local airport times.

2026-12-21 → 2027-01-04 · $512.85

  • United Airlines UA1128: IAD 2026-12-21 17:55:00 → SEA 2026-12-21 21:01:00; nonstop; 366 minutes. Local airport times.
  • United Airlines UA2645: SEA 2027-01-04 22:50:00 → IAD 2027-01-05 06:51:00; nonstop; 301 minutes. Local airport times.

2026-12-21 → 2027-01-04 · $454.20

  • Alaska Airlines AS409: IAD 2026-12-21 07:05:00 → SEA 2026-12-21 10:00:00; nonstop; 355 minutes. Local airport times.
  • Alaska Airlines AS424 / AA3320: SEA 2027-01-04 00:30:00 → IAD 2027-01-04 11:23:00; 1 stop(s) via DFW; 473 minutes. Local airport times.
    • AS424: SEA 2027-01-04 00:30:00 → DFW 2027-01-04 06:20:00; layover at DFW: 70 minutes.
    • AA3320: DFW 2027-01-04 07:30:00 → IAD 2027-01-04 11:23:00.

2026-12-21 → 2027-01-04 · $480.50

  • Delta Air Lines DL1015: IAD 2026-12-21 07:00:00 → SEA 2026-12-21 10:10:00; nonstop; 370 minutes. Local airport times.
  • Delta Air Lines DL812 / DL5413: SEA 2027-01-04 06:00:00 → IAD 2027-01-04 16:18:00; 1 stop(s) via DTW; 438 minutes. Local airport times.
    • DL812: SEA 2027-01-04 06:00:00 → DTW 2027-01-04 13:12:00; layover at DTW: 93 minutes.
    • DL5413: DTW 2027-01-04 14:45:00 → IAD 2027-01-04 16:18:00.

2026-12-21 → 2027-01-04 · $485.85

  • United Airlines UA565 / UA2099: IAD 2026-12-21 06:10:00 → SEA 2026-12-21 12:19:00; 1 stop(s) via ORD; 549 minutes. Local airport times.
    • UA565: IAD 2026-12-21 06:10:00 → ORD 2026-12-21 07:32:00; layover at ORD: 113 minutes.
    • UA2099: ORD 2026-12-21 09:25:00 → SEA 2026-12-21 12:19:00.
  • United Airlines UA2645: SEA 2027-01-04 22:50:00 → IAD 2027-01-05 06:51:00; nonstop; 301 minutes. Local airport times.

2026-12-21 → 2027-01-04 · $485.85

  • United Airlines UA792 / UA2302: IAD 2026-12-21 08:15:00 → SEA 2026-12-21 13:35:00; 1 stop(s) via DEN; 500 minutes. Local airport times.
    • UA792: IAD 2026-12-21 08:15:00 → DEN 2026-12-21 10:27:00; layover at DEN: 63 minutes.
    • UA2302: DEN 2026-12-21 11:30:00 → SEA 2026-12-21 13:35:00.
  • United Airlines UA2645: SEA 2027-01-04 22:50:00 → IAD 2027-01-05 06:51:00; nonstop; 301 minutes. Local airport times.

2026-12-21 → 2027-01-04 · $485.85

  • United Airlines UA1359 / UA1330: IAD 2026-12-21 06:10:00 → SEA 2026-12-21 13:01:00; 1 stop(s) via EWR; 591 minutes. Local airport times.
    • UA1359: IAD 2026-12-21 06:10:00 → EWR 2026-12-21 07:28:00; layover at EWR: 132 minutes.
    • UA1330: EWR 2026-12-21 09:40:00 → SEA 2026-12-21 13:01:00.
  • United Airlines UA2645: SEA 2027-01-04 22:50:00 → IAD 2027-01-05 06:51:00; nonstop; 301 minutes. Local airport times.

2026-12-21 → 2027-01-04 · $487.25

  • United Airlines UA1128: IAD 2026-12-21 17:55:00 → SEA 2026-12-21 21:02:00; nonstop; 367 minutes. Local airport times.
  • United Airlines UA2601 / UA2087: SEA 2027-01-04 05:00:00 → IAD 2027-01-04 15:44:00; 1 stop(s) via DEN; 464 minutes. Local airport times.
    • UA2601: SEA 2027-01-04 05:00:00 → DEN 2027-01-04 08:41:00; layover at DEN: 99 minutes.
    • UA2087: DEN 2027-01-04 10:20:00 → IAD 2027-01-04 15:44:00.

More dates for this route