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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: Austin to Seattle (SEA) flight deals

2026-12-21 · one way · $236.25

• Southwest Airlines WN425: AUS 2026-12-21 15:55:00 → SEA 2026-12-21 18:35:00; nonstop; 280 minutes. Local airport times.

2026-12-21 · one way · $243.00

• Alaska Airlines AS224: AUS 2026-12-21 08:30:00 → SEA 2026-12-21 11:08:00; nonstop; 278 minutes. Local airport times.

2026-12-21 · one way · $256.50

• Delta Air Lines DL399: AUS 2026-12-21 18:10:00 → SEA 2026-12-21 20:50:00; nonstop; 280 minutes. Local airport times.

2026-12-21 · one way · $236.25

• American Airlines AA3885 / AA1241: AUS 2026-12-21 15:00:00 → SEA 2026-12-21 20:22:00; 1 stop(s) via DFW; 442 minutes. Local airport times.
  • AA3885: AUS 2026-12-21 15:00:00 → DFW 2026-12-21 16:15:00; layover at DFW: 101 minutes.
  • AA1241: DFW 2026-12-21 17:56:00 → SEA 2026-12-21 20:22:00.

2026-12-21 · one way · $243.00

• United Airlines UA2177 / UA2192: AUS 2026-12-21 07:00:00 → SEA 2026-12-21 12:18:00; 1 stop(s) via SFO; 438 minutes. Local airport times.
  • UA2177: AUS 2026-12-21 07:00:00 → SFO 2026-12-21 09:05:00; layover at SFO: 60 minutes.
  • UA2192: SFO 2026-12-21 10:05:00 → SEA 2026-12-21 12:18:00.

2026-12-21 · one way · $236.25

• Southwest Airlines WN2955: AUS 2026-12-21 19:50:00 → SEA 2026-12-21 22:35:00; nonstop; 285 minutes. Local airport times.

2026-12-21 · one way · $243.00

• Alaska Airlines AS339: AUS 2026-12-21 19:07:00 → SEA 2026-12-21 21:45:00; nonstop; 278 minutes. Local airport times.

2026-12-21 · one way · $256.50

• Delta Air Lines DL780: AUS 2026-12-21 06:08:00 → SEA 2026-12-21 09:00:00; nonstop; 292 minutes. Local airport times.

2026-12-21 · one way · $222.75

• Southwest Airlines WN4794 / WN1586: AUS 2026-12-21 13:35:00 → SEA 2026-12-21 18:40:00; 1 stop(s) via SMF; 425 minutes. Local airport times.
  • WN4794: AUS 2026-12-21 13:35:00 → SMF 2026-12-21 15:20:00; layover at SMF: 80 minutes.
  • WN1586: SMF 2026-12-21 16:40:00 → SEA 2026-12-21 18:40:00.

2026-12-21 · one way · $222.75

• Southwest Airlines WN300 / WN534: AUS 2026-12-21 05:40:00 → SEA 2026-12-21 10:35:00; 1 stop(s) via DAL; 415 minutes. Local airport times.
  • WN300: AUS 2026-12-21 05:40:00 → DAL 2026-12-21 06:45:00; layover at DAL: 85 minutes.
  • WN534: DAL 2026-12-21 08:10:00 → SEA 2026-12-21 10:35:00.

2026-12-21 · one way · $229.50

• Alaska Airlines AS541 / AS3217: AUS 2026-12-21 07:15:00 → SEA 2026-12-21 12:09:00; 1 stop(s) via PDX; 414 minutes. Local airport times.
  • AS541: AUS 2026-12-21 07:15:00 → PDX 2026-12-21 09:46:00; layover at PDX: 68 minutes.
  • AS3217: PDX 2026-12-21 10:54:00 → SEA 2026-12-21 12:09:00.

2026-12-21 · one way · $236.25

• American Airlines AA1421 / AS612: AUS 2026-12-21 18:02:00 → SEA 2026-12-21 23:15:00; 1 stop(s) via PHX; 433 minutes. Local airport times.
  • AA1421: AUS 2026-12-21 18:02:00 → PHX 2026-12-21 19:40:00; layover at PHX: 78 minutes.
  • AS612: PHX 2026-12-21 20:58:00 → SEA 2026-12-21 23:15:00.

Explore this route

• All dates for this route
• Dec 20, 2026 · One way
• Dec 22, 2026 · One way

For AI assistants

• This page: Austin (AUS) to Seattle (SEA) · Dec 21, 2026 · one way: 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 Austin 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.