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Seattle → Dulles

Dec 21, 2026 · return Dec 26, 2026

SEA → IAD1 adulteconomyRound trip

11 flight options · 3 airlines

Nonstop flights

Mon, Dec 21 – Sat, Dec 26

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

Round-trip total · 1 adult · Taxes included

Mon, Dec 21 – Sat, Dec 26

United Airlines
10:50 pmSEA
5h 1m
Nonstop
6:51 am+1IAD
United Airlines
8:50 amIAD
6h 7m
Nonstop
11:57 amSEA

Round-trip total · 1 adult · Taxes included

Mon, Dec 21 – Sat, Dec 26

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

Round-trip total · 1 adult · Taxes included

Mon, Dec 21 – Sat, Dec 26

Alaska Airlines
8:30 amSEA
4h 58m
Nonstop
4:28 pmIAD
Alaska Airlines
7:05 amIAD
5h 55m
Nonstop
10:00 amSEA

Round-trip total · 1 adult · Taxes included

Mon, Dec 21 – Sat, Dec 26

United Airlines
8:09 amSEA
4h 59m
Nonstop
4:08 pmIAD
United Airlines
8:50 amIAD
6h 7m
Nonstop
11:57 amSEA

Round-trip total · 1 adult · Taxes included

One-stop flights

Mon, Dec 21 – Sat, Dec 26

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

Round-trip total · 1 adult · Taxes included

Mon, Dec 21 – Sat, Dec 26

United Airlines
10:50 amSEA
7h 23m
ORD · 1h 10m
9:13 pmIAD
United Airlines
8:50 amIAD
6h 7m
Nonstop
11:57 amSEA

Round-trip total · 1 adult · Taxes included

Mon, Dec 21 – Sat, Dec 26

United Airlines
5:00 amSEA
7h 44m
DEN · 1h 39m
3:44 pmIAD
United Airlines
8:50 amIAD
6h 7m
Nonstop
11:57 amSEA

Round-trip total · 1 adult · Taxes included

Mon, Dec 21 – Sat, Dec 26

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

Round-trip total · 1 adult · Taxes included

Mon, Dec 21 – Sat, Dec 26

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

Round-trip total · 1 adult · Taxes included

Mon, Dec 21 – Sat, Dec 26

Delta Air Lines
6:00 amSEA
7h 18m
DTW · 1h 33m
4:18 pmIAD
Delta Air Lines
7:00 amIAD
6h 5m
Nonstop
10:05 amSEA

Round-trip total · 1 adult · Taxes included

Make this trip yours

SEA ⇄ IAD

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

More dates

All dates for this routeNov 20, 2026 → Nov 23, 2026Nov 27, 2026 → Dec 4, 2026Nov 20, 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 → 2026-12-26Alaska AirlinesAS367 / AS409$559.002026-10-29T01:15:29Z
2026-12-21 → 2026-12-26United AirlinesUA2645 / UA2731$572.002026-10-29T01:15:29Z
2026-12-21 → 2026-12-26Delta Air LinesDL541 / DL1015$585.002026-10-29T01:15:29Z
2026-12-21 → 2026-12-26Alaska AirlinesAS737 / AS409$559.002026-10-29T01:15:29Z
2026-12-21 → 2026-12-26United AirlinesUA672 / UA2731$572.002026-10-29T01:15:29Z
2026-12-21 → 2026-12-26Alaska AirlinesAS424 + AA3320 / AS409$539.502026-10-29T01:15:29Z
2026-12-21 → 2026-12-26United AirlinesUA747 + UA2202 / UA2731$552.502026-10-29T01:15:29Z
2026-12-21 → 2026-12-26United AirlinesUA2601 + UA2087 / UA2731$552.502026-10-29T01:15:29Z
2026-12-21 → 2026-12-26Delta Air LinesDL541 / DL5511 + DL734$565.502026-10-29T01:15:29Z
2026-12-21 → 2026-12-26Delta Air LinesDL1120 + DL847 / DL1015$565.502026-10-29T01:15:29Z
2026-12-21 → 2026-12-26Delta Air LinesDL812 + DL5413 / DL1015$565.502026-10-29T01:15:29Z

2026-12-21 → 2026-12-26 · $559.00

  • Alaska Airlines AS367: SEA 2026-12-21 21:40:00 → IAD 2026-12-22 05:35:00; nonstop; 295 minutes. Local airport times.
  • Alaska Airlines AS409: IAD 2026-12-26 07:05:00 → SEA 2026-12-26 10:00:00; nonstop; 355 minutes. Local airport times.

2026-12-21 → 2026-12-26 · $572.00

  • United Airlines UA2645: SEA 2026-12-21 22:50:00 → IAD 2026-12-22 06:51:00; nonstop; 301 minutes. Local airport times.
  • United Airlines UA2731: IAD 2026-12-26 08:50:00 → SEA 2026-12-26 11:57:00; nonstop; 367 minutes. Local airport times.

2026-12-21 → 2026-12-26 · $585.00

  • Delta Air Lines DL541: SEA 2026-12-21 16:30:00 → IAD 2026-12-22 00:20:00; nonstop; 290 minutes. Local airport times.
  • Delta Air Lines DL1015: IAD 2026-12-26 07:00:00 → SEA 2026-12-26 10:05:00; nonstop; 365 minutes. Local airport times.

2026-12-21 → 2026-12-26 · $559.00

  • Alaska Airlines AS737: SEA 2026-12-21 08:30:00 → IAD 2026-12-21 16:28:00; nonstop; 298 minutes. Local airport times.
  • Alaska Airlines AS409: IAD 2026-12-26 07:05:00 → SEA 2026-12-26 10:00:00; nonstop; 355 minutes. Local airport times.

2026-12-21 → 2026-12-26 · $572.00

  • United Airlines UA672: SEA 2026-12-21 08:09:00 → IAD 2026-12-21 16:08:00; nonstop; 299 minutes. Local airport times.
  • United Airlines UA2731: IAD 2026-12-26 08:50:00 → SEA 2026-12-26 11:57:00; nonstop; 367 minutes. Local airport times.

2026-12-21 → 2026-12-26 · $539.50

  • Alaska Airlines AS424 / AA3320: SEA 2026-12-21 00:30:00 → IAD 2026-12-21 11:23:00; 1 stop(s) via DFW; 473 minutes. Local airport times.
    • AS424: SEA 2026-12-21 00:30:00 → DFW 2026-12-21 06:20:00; layover at DFW: 70 minutes.
    • AA3320: DFW 2026-12-21 07:30:00 → IAD 2026-12-21 11:23:00.
  • Alaska Airlines AS409: IAD 2026-12-26 07:05:00 → SEA 2026-12-26 10:00:00; nonstop; 355 minutes. Local airport times.

2026-12-21 → 2026-12-26 · $552.50

  • United Airlines UA747 / UA2202: SEA 2026-12-21 10:50:00 → IAD 2026-12-21 21:13:00; 1 stop(s) via ORD; 443 minutes. Local airport times.
    • UA747: SEA 2026-12-21 10:50:00 → ORD 2026-12-21 17:00:00; layover at ORD: 70 minutes.
    • UA2202: ORD 2026-12-21 18:10:00 → IAD 2026-12-21 21:13:00.
  • United Airlines UA2731: IAD 2026-12-26 08:50:00 → SEA 2026-12-26 11:57:00; nonstop; 367 minutes. Local airport times.

2026-12-21 → 2026-12-26 · $552.50

  • United Airlines UA2601 / UA2087: SEA 2026-12-21 05:00:00 → IAD 2026-12-21 15:44:00; 1 stop(s) via DEN; 464 minutes. Local airport times.
    • UA2601: SEA 2026-12-21 05:00:00 → DEN 2026-12-21 08:41:00; layover at DEN: 99 minutes.
    • UA2087: DEN 2026-12-21 10:20:00 → IAD 2026-12-21 15:44:00.
  • United Airlines UA2731: IAD 2026-12-26 08:50:00 → SEA 2026-12-26 11:57:00; nonstop; 367 minutes. Local airport times.

2026-12-21 → 2026-12-26 · $565.50

  • Delta Air Lines DL541: SEA 2026-12-21 16:30:00 → IAD 2026-12-22 00:31:00; nonstop; 301 minutes. Local airport times.
  • Delta Air Lines DL5511 / DL734: IAD 2026-12-26 06:00:00 → SEA 2026-12-26 11:09:00; 1 stop(s) via DTW; 489 minutes. Local airport times.
    • DL5511: IAD 2026-12-26 06:00:00 → DTW 2026-12-26 07:46:00; layover at DTW: 69 minutes.
    • DL734: DTW 2026-12-26 08:55:00 → SEA 2026-12-26 11:09:00.

2026-12-21 → 2026-12-26 · $565.50

  • Delta Air Lines DL1120 / DL847: SEA 2026-12-21 13:25:00 → IAD 2026-12-21 23:47:00; 1 stop(s) via SLC; 442 minutes. Local airport times.
    • DL1120: SEA 2026-12-21 13:25:00 → SLC 2026-12-21 16:26:00; layover at SLC: 85 minutes.
    • DL847: SLC 2026-12-21 17:51:00 → IAD 2026-12-21 23:47:00.
  • Delta Air Lines DL1015: IAD 2026-12-26 07:00:00 → SEA 2026-12-26 10:05:00; nonstop; 365 minutes. Local airport times.

2026-12-21 → 2026-12-26 · $565.50

  • Delta Air Lines DL812 / DL5413: SEA 2026-12-21 06:00:00 → IAD 2026-12-21 16:18:00; 1 stop(s) via DTW; 438 minutes. Local airport times.
    • DL812: SEA 2026-12-21 06:00:00 → DTW 2026-12-21 13:12:00; layover at DTW: 93 minutes.
    • DL5413: DTW 2026-12-21 14:45:00 → IAD 2026-12-21 16:18:00.
  • Delta Air Lines DL1015: IAD 2026-12-26 07:00:00 → SEA 2026-12-26 10:05:00; nonstop; 365 minutes. Local airport times.

More dates for this route