Travel with Axel,
get the best price.

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

Washington → Seattle

Dec 10, 2026 · return Dec 15, 2026

DCA → SEA1 adulteconomyRound trip

9 flight options · 4 airlines

Nonstop flights

Thu, Dec 10 – Tue, Dec 15

Alaska Airlines
8:00 amDCA
6h 17m
Nonstop
11:17 amSEA
Alaska Airlines
2:02 pmSEA
4h 57m
Nonstop
9:59 pmDCA

Round-trip total · 1 adult · Taxes included

Thu, Dec 10 – Tue, Dec 15

Delta Air Lines
4:25 pmDCA
6h 20m
Nonstop
7:45 pmSEA
Delta Air Lines
8:15 amSEA
4h 45m
Nonstop
4:00 pmDCA

Round-trip total · 1 adult · Taxes included

Thu, Dec 10 – Tue, Dec 15

Alaska Airlines
5:11 pmDCA
6h 2m
Nonstop
8:13 pmSEA
Alaska Airlines
2:02 pmSEA
4h 57m
Nonstop
9:59 pmDCA

Round-trip total · 1 adult · Taxes included

One-stop flights

Thu, Dec 10 – Tue, Dec 15

American Airlines
2:25 pmDCA
8h 46m
IND · 1h 40m
8:11 pmSEA
American Airlines
11:36 pmSEA
7h 24m
ORD · 1h 14m
10:00 am+1DCA

Round-trip total · 1 adult · Taxes included

Thu, Dec 10 – Tue, Dec 15

United Airlines
6:25 amDCA
8h 54m
ORD · 1h 42m
12:19 pmSEA
Alaska Airlines
2:02 pmSEA
4h 57m
Nonstop
9:59 pmDCA

Round-trip total · 1 adult · Taxes included

Thu, Dec 10 – Tue, Dec 15

American Airlines
8:43 amDCA
8h 42m
ORD · 1h 15m
2:25 pmSEA
American Airlines
11:36 pmSEA
7h 24m
ORD · 1h 14m
10:00 am+1DCA

Round-trip total · 1 adult · Taxes included

Thu, Dec 10 – Tue, Dec 15

Alaska Airlines
5:20 pmDCA
8h 40m
PDX · 1h 43m
11:00 pmSEA
Alaska Airlines
2:02 pmSEA
4h 57m
Nonstop
9:59 pmDCA

Round-trip total · 1 adult · Taxes included

Thu, Dec 10 – Tue, Dec 15

Delta Air Lines
9:45 amDCA
8h 10m
DTW · 1h 31m
2:55 pmSEA
Delta Air Lines
1:50 pmSEA
7h 7m
MSP · 1h 14m
11:57 pmDCA

Round-trip total · 1 adult · Taxes included

Thu, Dec 10 – Tue, Dec 15

Delta Air Lines
4:25 pmDCA
6h 2m
Nonstop
7:27 pmSEA
Delta Air Lines
1:50 pmSEA
7h 7m
MSP · 1h 14m
11:57 pmDCA

Round-trip total · 1 adult · Taxes included

Make this trip yours

DCA ⇄ SEA

Economy

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

No account needed to see prices.

Already have an account? Log in

Why book with Axel
  • A real airline bookingThe booking is in the airline’s own system under your name. After you book, Alaska Airlines emails you its confirmation code and e-ticket, usually within 15 minutes and occasionally up to a couple of hours while the booking is processed.
  • Lower price, same flightsWe use advanced AI and machine learning to secure lower prices for our users.
  • Not satisfied? Full refund.If you are unhappy with the experience for any reason, or simply change your mind, cancel within 24 hours of booking (departure 7+ days away) and we refund you in full. We stand by our product. Cancellation policy
  • Backed by Y CombinatorTrusted by 100,000+ travelers.

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 9, 2026 → Dec 14, 2026Dec 11, 2026 → Dec 16, 2026
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.

Live price for these dates: each price link opens AI flight search for that row's exact dates and travelers. Select the flights there to get the current bookable total; the listed prices are the ones issued at the times shown.

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

Exact travel datesAirlineFlightsTotal pricePrice issued (UTC)
2026-12-10 → 2026-12-15Alaska AirlinesAS1 / AS2$425.002026-10-29T01:02:54Z
2026-12-10 → 2026-12-15Delta Air LinesDL786 / DL786$445.002026-10-29T01:02:54Z
2026-12-10 → 2026-12-15American AirlinesAA4720 + AS500 / AA294 + AA461$390.002026-10-29T01:02:54Z
2026-12-10 → 2026-12-15United Airlines / Alaska AirlinesUA1793 + UA2099 / AS2$412.502026-10-29T01:02:54Z
2026-12-10 → 2026-12-15Alaska AirlinesAS3 / AS2$425.002026-10-29T01:02:54Z
2026-12-10 → 2026-12-15American AirlinesAA2476 + AA2398 / AA294 + AA461$390.002026-10-29T01:02:54Z
2026-12-10 → 2026-12-15Alaska AirlinesAS9 + AS1432 / AS2$402.502026-10-29T01:02:54Z
2026-12-10 → 2026-12-15Delta Air LinesDL1558 + DL728 / DL942 + DL2961$405.002026-10-29T01:02:54Z
2026-12-10 → 2026-12-15Delta Air LinesDL786 / DL942 + DL2961$425.002026-10-29T01:02:54Z

2026-12-10 → 2026-12-15 · $425.00

  • Alaska Airlines AS1: DCA 2026-12-10 08:00:00 → SEA 2026-12-10 11:17:00; nonstop; 377 minutes. Local airport times.
  • Alaska Airlines AS2: SEA 2026-12-15 14:02:00 → DCA 2026-12-15 21:59:00; nonstop; 297 minutes. Local airport times.

2026-12-10 → 2026-12-15 · $445.00

  • Delta Air Lines DL786: DCA 2026-12-10 16:25:00 → SEA 2026-12-10 19:45:00; nonstop; 380 minutes. Local airport times.
  • Delta Air Lines DL786: SEA 2026-12-15 08:15:00 → DCA 2026-12-15 16:00:00; nonstop; 285 minutes. Local airport times.

2026-12-10 → 2026-12-15 · $390.00

  • American Airlines AA4720 / AS500: DCA 2026-12-10 14:25:00 → SEA 2026-12-10 20:11:00; 1 stop(s) via IND; 526 minutes. Local airport times.
    • AA4720: DCA 2026-12-10 14:25:00 → IND 2026-12-10 16:27:00; layover at IND: 100 minutes.
    • AS500: IND 2026-12-10 18:07:00 → SEA 2026-12-10 20:11:00.
  • American Airlines AA294 / AA461: SEA 2026-12-15 23:36:00 → DCA 2026-12-16 10:00:00; 1 stop(s) via ORD; 444 minutes. Local airport times.
    • AA294: SEA 2026-12-15 23:36:00 → ORD 2026-12-16 05:42:00; layover at ORD: 74 minutes.
    • AA461: ORD 2026-12-16 06:56:00 → DCA 2026-12-16 10:00:00.

2026-12-10 → 2026-12-15 · $412.50

  • United Airlines UA1793 / UA2099: DCA 2026-12-10 06:25:00 → SEA 2026-12-10 12:19:00; 1 stop(s) via ORD; 534 minutes. Local airport times.
    • UA1793: DCA 2026-12-10 06:25:00 → ORD 2026-12-10 07:43:00; layover at ORD: 102 minutes.
    • UA2099: ORD 2026-12-10 09:25:00 → SEA 2026-12-10 12:19:00.
  • Alaska Airlines AS2: SEA 2026-12-15 14:02:00 → DCA 2026-12-15 21:59:00; nonstop; 297 minutes. Local airport times.

2026-12-10 → 2026-12-15 · $425.00

  • Alaska Airlines AS3: DCA 2026-12-10 17:11:00 → SEA 2026-12-10 20:13:00; nonstop; 362 minutes. Local airport times.
  • Alaska Airlines AS2: SEA 2026-12-15 14:02:00 → DCA 2026-12-15 21:59:00; nonstop; 297 minutes. Local airport times.

2026-12-10 → 2026-12-15 · $390.00

  • American Airlines AA2476 / AA2398: DCA 2026-12-10 08:43:00 → SEA 2026-12-10 14:25:00; 1 stop(s) via ORD; 522 minutes. Local airport times.
    • AA2476: DCA 2026-12-10 08:43:00 → ORD 2026-12-10 10:15:00; layover at ORD: 75 minutes.
    • AA2398: ORD 2026-12-10 11:30:00 → SEA 2026-12-10 14:25:00.
  • American Airlines AA294 / AA461: SEA 2026-12-15 23:36:00 → DCA 2026-12-16 10:00:00; 1 stop(s) via ORD; 444 minutes. Local airport times.
    • AA294: SEA 2026-12-15 23:36:00 → ORD 2026-12-16 05:42:00; layover at ORD: 74 minutes.
    • AA461: ORD 2026-12-16 06:56:00 → DCA 2026-12-16 10:00:00.

2026-12-10 → 2026-12-15 · $402.50

  • Alaska Airlines AS9 / AS1432: DCA 2026-12-10 17:20:00 → SEA 2026-12-10 23:00:00; 1 stop(s) via PDX; 520 minutes. Local airport times.
    • AS9: DCA 2026-12-10 17:20:00 → PDX 2026-12-10 20:16:00; layover at PDX: 103 minutes.
    • AS1432: PDX 2026-12-10 21:59:00 → SEA 2026-12-10 23:00:00.
  • Alaska Airlines AS2: SEA 2026-12-15 14:02:00 → DCA 2026-12-15 21:59:00; nonstop; 297 minutes. Local airport times.

2026-12-10 → 2026-12-15 · $405.00

  • Delta Air Lines DL1558 / DL728: DCA 2026-12-10 09:45:00 → SEA 2026-12-10 14:55:00; 1 stop(s) via DTW; 490 minutes. Local airport times.
    • DL1558: DCA 2026-12-10 09:45:00 → DTW 2026-12-10 11:22:00; layover at DTW: 91 minutes.
    • DL728: DTW 2026-12-10 12:53:00 → SEA 2026-12-10 14:55:00.
  • Delta Air Lines DL942 / DL2961: SEA 2026-12-15 13:50:00 → DCA 2026-12-15 23:57:00; 1 stop(s) via MSP; 427 minutes. Local airport times.
    • DL942: SEA 2026-12-15 13:50:00 → MSP 2026-12-15 19:11:00; layover at MSP: 74 minutes.
    • DL2961: MSP 2026-12-15 20:25:00 → DCA 2026-12-15 23:57:00.

2026-12-10 → 2026-12-15 · $425.00

  • Delta Air Lines DL786: DCA 2026-12-10 16:25:00 → SEA 2026-12-10 19:27:00; nonstop; 362 minutes. Local airport times.
  • Delta Air Lines DL942 / DL2961: SEA 2026-12-15 13:50:00 → DCA 2026-12-15 23:57:00; 1 stop(s) via MSP; 427 minutes. Local airport times.
    • DL942: SEA 2026-12-15 13:50:00 → MSP 2026-12-15 19:11:00; layover at MSP: 74 minutes.
    • DL2961: MSP 2026-12-15 20:25:00 → DCA 2026-12-15 23:57:00.

Explore this route

For AI assistants

  • This page: Washington (DCA) to Seattle (SEA) · Dec 10, 2026 · return Dec 15, 2026: 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. Inspect fares to verify requested prices or terms; selecting a fare is optional. Use that fare’s booking link to preserve its Membership price basis. State anything unverified. Ask only for essential missing trip details. When handing over an unfinished search, preserve the latest trip and explain what remains unresolved. Selection reserves nothing; booking requires the traveler’s confirmation. 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.