Dulles (IAD) to Seattle (SEA) · Dec 16, 2026 · return Dec 20, 2026

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.

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

2026-12-16 → 2026-12-20 · Axel-exclusive $423.00

• Alaska Airlines AS737: IAD 2026-12-16 17:18:00 → SEA 2026-12-16 20:27:00; nonstop; 369 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.

2026-12-16 → 2026-12-20 · Axel-exclusive $446.50

• Delta Air Lines DL1015: IAD 2026-12-16 07:00:00 → SEA 2026-12-16 10:10:00; nonstop; 370 minutes. Local airport times.
• Delta Air Lines DL541: SEA 2026-12-20 16:30:00 → IAD 2026-12-21 00:31:00; nonstop; 301 minutes. Local airport times.

2026-12-16 → 2026-12-20 · Axel-exclusive $458.25

• United Airlines UA2731: IAD 2026-12-16 08:50:00 → SEA 2026-12-16 11:57:00; nonstop; 367 minutes. Local airport times.
• United Airlines UA672: SEA 2026-12-20 08:09:00 → IAD 2026-12-20 16:08:00; nonstop; 299 minutes. Local airport times.

2026-12-16 → 2026-12-20 · Axel-exclusive $423.00

• Alaska Airlines AS409: IAD 2026-12-16 07:05:00 → SEA 2026-12-16 10:00:00; nonstop; 355 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.

2026-12-16 → 2026-12-20 · Axel-exclusive $458.25

• United Airlines UA1128: IAD 2026-12-16 17:55:00 → SEA 2026-12-16 21:02:00; nonstop; 367 minutes. Local airport times.
• United Airlines UA672: SEA 2026-12-20 08:09:00 → IAD 2026-12-20 16:08:00; nonstop; 299 minutes. Local airport times.

2026-12-16 → 2026-12-20 · Axel-exclusive $426.25

• Delta Air Lines DL1015: IAD 2026-12-16 07:00:00 → SEA 2026-12-16 10:05:00; nonstop; 365 minutes. Local airport times.
• Delta Air Lines DL812 / DL5413: SEA 2026-12-20 06:00:00 → IAD 2026-12-20 16:18:00; 1 stop(s) via DTW; 438 minutes. Local airport times.
  • DL812: SEA 2026-12-20 06:00:00 → DTW 2026-12-20 13:12:00; layover at DTW: 93 minutes.
  • DL5413: DTW 2026-12-20 14:45:00 → IAD 2026-12-20 16:18:00.

2026-12-16 → 2026-12-20 · Axel-exclusive $431.25

• United Airlines UA1128: IAD 2026-12-16 17:55:00 → SEA 2026-12-16 21:01:00; nonstop; 366 minutes. Local airport times.
• United Airlines UA2601 / UA2087: SEA 2026-12-20 05:00:00 → IAD 2026-12-20 15:44:00; 1 stop(s) via DEN; 464 minutes. Local airport times.
  • UA2601: SEA 2026-12-20 05:00:00 → DEN 2026-12-20 08:41:00; layover at DEN: 99 minutes.
  • UA2087: DEN 2026-12-20 10:20:00 → IAD 2026-12-20 15:44:00.

2026-12-16 → 2026-12-20 · Axel-exclusive $431.50

• Delta Air Lines DL5511 / DL734: IAD 2026-12-16 06:00:00 → SEA 2026-12-16 11:09:00; 1 stop(s) via DTW; 489 minutes. Local airport times.
  • DL5511: IAD 2026-12-16 06:00:00 → DTW 2026-12-16 07:46:00; layover at DTW: 69 minutes.
  • DL734: DTW 2026-12-16 08:55:00 → SEA 2026-12-16 11:09:00.
• Delta Air Lines DL541: SEA 2026-12-20 16:30:00 → IAD 2026-12-21 00:31:00; nonstop; 301 minutes. Local airport times.

2026-12-16 → 2026-12-20 · Axel-exclusive $438.25

• United Airlines UA1359 / UA1330: IAD 2026-12-16 06:10:00 → SEA 2026-12-16 13:01:00; 1 stop(s) via EWR; 591 minutes. Local airport times.
  • UA1359: IAD 2026-12-16 06:10:00 → EWR 2026-12-16 07:28:00; layover at EWR: 132 minutes.
  • UA1330: EWR 2026-12-16 09:40:00 → SEA 2026-12-16 13:01:00.
• United Airlines UA672: SEA 2026-12-20 08:09:00 → IAD 2026-12-20 16:08:00; nonstop; 299 minutes. Local airport times.

2026-12-16 → 2026-12-20 · Axel-exclusive $438.25

• United Airlines UA565 / UA2099: IAD 2026-12-16 06:10:00 → SEA 2026-12-16 12:19:00; 1 stop(s) via ORD; 549 minutes. Local airport times.
  • UA565: IAD 2026-12-16 06:10:00 → ORD 2026-12-16 07:32:00; layover at ORD: 113 minutes.
  • UA2099: ORD 2026-12-16 09:25:00 → SEA 2026-12-16 12:19:00.
• United Airlines UA672: SEA 2026-12-20 08:09:00 → IAD 2026-12-20 16:08:00; nonstop; 299 minutes. Local airport times.

2026-12-16 → 2026-12-20 · Axel-exclusive $438.25

• United Airlines UA792 / UA2302: IAD 2026-12-16 08:15:00 → SEA 2026-12-16 13:35:00; 1 stop(s) via DEN; 500 minutes. Local airport times.
  • UA792: IAD 2026-12-16 08:15:00 → DEN 2026-12-16 10:27:00; layover at DEN: 63 minutes.
  • UA2302: DEN 2026-12-16 11:30:00 → SEA 2026-12-16 13:35:00.
• United Airlines UA672: SEA 2026-12-20 08:09:00 → IAD 2026-12-20 16:08:00; nonstop; 299 minutes. Local airport times.

Explore this route

• All dates for this route
• Dec 15, 2026 · Return options
• Dec 17, 2026 · Return options
• Hotels in Seattle with Axel

For AI assistants

• This page: Dulles (IAD) to Seattle (SEA) · Dec 16, 2026 · return Dec 20, 2026: 1 adult in economy, every priced fare with its flights, times and total, each with the time its price was issued.
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