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Dulles → Seattle

Jan 21, 2027 · return Feb 4, 2027

IAD → SEA1 adulteconomyRound trip

11 flight options · 4 airlines

Nonstop flights

Thu, Jan 21 – Thu, Feb 4

Alaska Airlines
5:18 pmIAD
6h 9m
Nonstop
8:27 pmSEA
Alaska Airlines
8:30 amSEA
4h 58m
Nonstop
4:28 pmIAD

Round-trip total · 1 adult · Taxes included

Thu, Jan 21 – Thu, Feb 4

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

Round-trip total · 1 adult · Taxes included

Thu, Jan 21 – Thu, Feb 4

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

Round-trip total · 1 adult · Taxes included

Thu, Jan 21 – Thu, Feb 4

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

Round-trip total · 1 adult · Taxes included

Thu, Jan 21 – Thu, Feb 4

United Airlines
5:50 pmIAD
6h 6m
Nonstop
8:56 pmSEA
United Airlines
8:09 amSEA
4h 59m
Nonstop
4:08 pmIAD

Round-trip total · 1 adult · Taxes included

One-stop flights

Thu, Jan 21 – Thu, Feb 4

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

Thu, Jan 21 – Thu, Feb 4

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

Round-trip total · 1 adult · Taxes included

Thu, Jan 21 – Thu, Feb 4

Delta Air Lines
6:00 amIAD
8h 9m
DTW · 1h 9m
11:09 amSEA
Delta Air Lines
4:30 pmSEA
4h 50m
Nonstop
12:20 am+1IAD

Round-trip total · 1 adult · Taxes included

Thu, Jan 21 – Thu, Feb 4

Delta Air Lines
7:00 amIAD
8h 36m
SLC · 1h 21m
12:36 pmSEA
Delta Air Lines
4:30 pmSEA
4h 50m
Nonstop
12:20 am+1IAD

Round-trip total · 1 adult · Taxes included

Thu, Jan 21 – Thu, Feb 4

United Airlines
6:10 amIAD
9h 9m
ORD · 1h 53m
12:19 pmSEA
United Airlines
8:09 amSEA
4h 59m
Nonstop
4:08 pmIAD

Round-trip total · 1 adult · Taxes included

Thu, Jan 21 – Thu, Feb 4

United Airlines
8:15 amIAD
8h 20m
DEN · 1h 3m
1:35 pmSEA
United Airlines
8:09 amSEA
4h 59m
Nonstop
4:08 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 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)
2027-01-21 → 2027-02-04Alaska AirlinesAS737 / AS737$342.002026-10-29T01:07:59Z
2027-01-21 → 2027-02-04Delta Air LinesDL1015 / DL541$361.002026-10-29T01:07:59Z
2027-01-21 → 2027-02-04United AirlinesUA2731 / UA672$370.502026-10-29T01:07:59Z
2027-01-21 → 2027-02-04Sun Country Airlines / Alaska AirlinesSY668 + SY285 / AS737$294.502026-10-29T01:07:59Z
2027-01-21 → 2027-02-04Alaska AirlinesAS409 / AS737$342.002026-10-29T01:07:59Z
2027-01-21 → 2027-02-04United AirlinesUA1128 / UA672$370.502026-10-29T01:07:59Z
2027-01-21 → 2027-02-04Delta Air LinesDL1015 / DL812 + DL5413$346.752026-10-29T01:07:59Z
2027-01-21 → 2027-02-04Delta Air LinesDL5511 + DL734 / DL541$346.752026-10-29T01:07:59Z
2027-01-21 → 2027-02-04Delta Air LinesDL432 + DL2995 / DL541$346.752026-10-29T01:07:59Z
2027-01-21 → 2027-02-04United AirlinesUA565 + UA2099 / UA672$351.502026-10-29T01:07:59Z
2027-01-21 → 2027-02-04United AirlinesUA792 + UA2302 / UA672$351.502026-10-29T01:07:59Z

2027-01-21 → 2027-02-04 · $342.00

  • Alaska Airlines AS737: IAD 2027-01-21 17:18:00 → SEA 2027-01-21 20:27:00; nonstop; 369 minutes. Local airport times.
  • Alaska Airlines AS737: SEA 2027-02-04 08:30:00 → IAD 2027-02-04 16:28:00; nonstop; 298 minutes. Local airport times.

2027-01-21 → 2027-02-04 · $361.00

  • Delta Air Lines DL1015: IAD 2027-01-21 07:00:00 → SEA 2027-01-21 10:10:00; nonstop; 370 minutes. Local airport times.
  • Delta Air Lines DL541: SEA 2027-02-04 16:30:00 → IAD 2027-02-05 00:20:00; nonstop; 290 minutes. Local airport times.

2027-01-21 → 2027-02-04 · $370.50

  • United Airlines UA2731: IAD 2027-01-21 08:50:00 → SEA 2027-01-21 11:57:00; nonstop; 367 minutes. Local airport times.
  • United Airlines UA672: SEA 2027-02-04 08:09:00 → IAD 2027-02-04 16:08:00; nonstop; 299 minutes. Local airport times.

2027-01-21 → 2027-02-04 · $294.50

  • Sun Country Airlines SY668 / SY285: IAD 2027-01-21 12:44:00 → SEA 2027-01-21 17:17:00; 1 stop(s) via MSP; 453 minutes. Local airport times.
    • SY668: IAD 2027-01-21 12:44:00 → MSP 2027-01-21 14:21:00; layover at MSP: 64 minutes.
    • SY285: MSP 2027-01-21 15:25:00 → SEA 2027-01-21 17:17:00.
  • Alaska Airlines AS737: SEA 2027-02-04 08:30:00 → IAD 2027-02-04 16:28:00; nonstop; 298 minutes. Local airport times.

2027-01-21 → 2027-02-04 · $342.00

  • Alaska Airlines AS409: IAD 2027-01-21 07:05:00 → SEA 2027-01-21 10:00:00; nonstop; 355 minutes. Local airport times.
  • Alaska Airlines AS737: SEA 2027-02-04 08:30:00 → IAD 2027-02-04 16:28:00; nonstop; 298 minutes. Local airport times.

2027-01-21 → 2027-02-04 · $370.50

  • United Airlines UA1128: IAD 2027-01-21 17:50:00 → SEA 2027-01-21 20:56:00; nonstop; 366 minutes. Local airport times.
  • United Airlines UA672: SEA 2027-02-04 08:09:00 → IAD 2027-02-04 16:08:00; nonstop; 299 minutes. Local airport times.

2027-01-21 → 2027-02-04 · $346.75

  • Delta Air Lines DL1015: IAD 2027-01-21 07:00:00 → SEA 2027-01-21 10:05:00; nonstop; 365 minutes. Local airport times.
  • Delta Air Lines DL812 / DL5413: SEA 2027-02-04 06:00:00 → IAD 2027-02-04 16:18:00; 1 stop(s) via DTW; 438 minutes. Local airport times.
    • DL812: SEA 2027-02-04 06:00:00 → DTW 2027-02-04 13:12:00; layover at DTW: 93 minutes.
    • DL5413: DTW 2027-02-04 14:45:00 → IAD 2027-02-04 16:18:00.

2027-01-21 → 2027-02-04 · $346.75

  • Delta Air Lines DL5511 / DL734: IAD 2027-01-21 06:00:00 → SEA 2027-01-21 11:09:00; 1 stop(s) via DTW; 489 minutes. Local airport times.
    • DL5511: IAD 2027-01-21 06:00:00 → DTW 2027-01-21 07:46:00; layover at DTW: 69 minutes.
    • DL734: DTW 2027-01-21 08:55:00 → SEA 2027-01-21 11:09:00.
  • Delta Air Lines DL541: SEA 2027-02-04 16:30:00 → IAD 2027-02-05 00:20:00; nonstop; 290 minutes. Local airport times.

2027-01-21 → 2027-02-04 · $346.75

  • Delta Air Lines DL432 / DL2995: IAD 2027-01-21 07:00:00 → SEA 2027-01-21 12:36:00; 1 stop(s) via SLC; 516 minutes. Local airport times.
    • DL432: IAD 2027-01-21 07:00:00 → SLC 2027-01-21 09:54:00; layover at SLC: 81 minutes.
    • DL2995: SLC 2027-01-21 11:15:00 → SEA 2027-01-21 12:36:00.
  • Delta Air Lines DL541: SEA 2027-02-04 16:30:00 → IAD 2027-02-05 00:20:00; nonstop; 290 minutes. Local airport times.

2027-01-21 → 2027-02-04 · $351.50

  • United Airlines UA565 / UA2099: IAD 2027-01-21 06:10:00 → SEA 2027-01-21 12:19:00; 1 stop(s) via ORD; 549 minutes. Local airport times.
    • UA565: IAD 2027-01-21 06:10:00 → ORD 2027-01-21 07:32:00; layover at ORD: 113 minutes.
    • UA2099: ORD 2027-01-21 09:25:00 → SEA 2027-01-21 12:19:00.
  • United Airlines UA672: SEA 2027-02-04 08:09:00 → IAD 2027-02-04 16:08:00; nonstop; 299 minutes. Local airport times.

2027-01-21 → 2027-02-04 · $351.50

  • United Airlines UA792 / UA2302: IAD 2027-01-21 08:15:00 → SEA 2027-01-21 13:35:00; 1 stop(s) via DEN; 500 minutes. Local airport times.
    • UA792: IAD 2027-01-21 08:15:00 → DEN 2027-01-21 10:27:00; layover at DEN: 63 minutes.
    • UA2302: DEN 2027-01-21 11:30:00 → SEA 2027-01-21 13:35:00.
  • United Airlines UA672: SEA 2027-02-04 08:09:00 → IAD 2027-02-04 16:08:00; nonstop; 299 minutes. Local airport times.

More dates for this route