Seattle (SEA) to Denver (DEN) · Dec 12, 2026 · return Dec 15, 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: Seattle to Denver (DEN) flight deals

2026-12-12 → 2026-12-15 · Axel-exclusive $140.00

• Frontier Airlines F91916: SEA 2026-12-12 16:37:00 → DEN 2026-12-12 20:25:00; nonstop; 168 minutes. Local airport times.
• Frontier Airlines F94545: DEN 2026-12-15 13:32:00 → SEA 2026-12-15 15:43:00; nonstop; 191 minutes. Local airport times.

2026-12-12 → 2026-12-15 · Axel-exclusive $245.00

• Southwest Airlines WN2150: SEA 2026-12-12 09:25:00 → DEN 2026-12-12 13:00:00; nonstop; 155 minutes. Local airport times.
• Southwest Airlines WN3141: DEN 2026-12-15 21:00:00 → SEA 2026-12-15 23:10:00; nonstop; 190 minutes. Local airport times.

2026-12-12 → 2026-12-15 · Axel-exclusive $250.00

• Alaska Airlines AS310: SEA 2026-12-12 17:05:00 → DEN 2026-12-12 20:44:00; nonstop; 159 minutes. Local airport times.
• Alaska Airlines AS493: DEN 2026-12-15 15:22:00 → SEA 2026-12-15 17:31:00; nonstop; 189 minutes. Local airport times.

2026-12-12 → 2026-12-15 · Axel-exclusive $260.00

• Delta Air Lines DL2851: SEA 2026-12-12 19:57:00 → DEN 2026-12-12 23:46:00; nonstop; 169 minutes. Local airport times.
• Delta Air Lines DL1731: DEN 2026-12-15 06:00:00 → SEA 2026-12-15 08:18:00; nonstop; 198 minutes. Local airport times.

2026-12-12 → 2026-12-15 · Axel-exclusive $270.00

• United Airlines UA2601: SEA 2026-12-12 05:00:00 → DEN 2026-12-12 08:41:00; nonstop; 161 minutes. Local airport times.
• United Airlines UA310: DEN 2026-12-15 11:45:00 → SEA 2026-12-15 13:49:00; nonstop; 184 minutes. Local airport times.

2026-12-12 → 2026-12-15 · Axel-exclusive $280.00

• American Airlines AA2073 / AA4952: SEA 2026-12-12 15:00:00 → DEN 2026-12-12 22:58:00; 1 stop(s) via PHX; 418 minutes. Local airport times.
  • AA2073: SEA 2026-12-12 15:00:00 → PHX 2026-12-12 18:52:00; layover at PHX: 127 minutes.
  • AA4952: PHX 2026-12-12 20:59:00 → DEN 2026-12-12 22:58:00.
• Alaska Airlines AS493: DEN 2026-12-15 15:22:00 → SEA 2026-12-15 17:31:00; nonstop; 189 minutes. Local airport times.

2026-12-12 → 2026-12-15 · Axel-exclusive $385.00

• Air Canada AC8803 / UA2470: SEA 2026-12-12 10:10:00 → DEN 2026-12-12 16:27:00; 1 stop(s) via YVR; 317 minutes. Local airport times.
  • AC8803: SEA 2026-12-12 10:10:00 → YVR 2026-12-12 12:21:00; layover at YVR: 75 minutes.
  • UA2470: YVR 2026-12-12 13:36:00 → DEN 2026-12-12 16:27:00.
• Air Canada AC575 / AC8804: DEN 2026-12-15 08:15:00 → SEA 2026-12-15 14:32:00; 1 stop(s) via YVR; 437 minutes. Local airport times.
  • AC575: DEN 2026-12-15 08:15:00 → YVR 2026-12-15 11:25:00; layover at YVR: 185 minutes.
  • AC8804: YVR 2026-12-15 14:30:00 → SEA 2026-12-15 14:32:00.

2026-12-12 → 2026-12-15 · Axel-exclusive $245.00

• Southwest Airlines WN3823: SEA 2026-12-12 13:55:00 → DEN 2026-12-12 17:30:00; nonstop; 155 minutes. Local airport times.
• Southwest Airlines WN3141: DEN 2026-12-15 21:00:00 → SEA 2026-12-15 23:10:00; nonstop; 190 minutes. Local airport times.

2026-12-12 → 2026-12-15 · Axel-exclusive $250.00

• Alaska Airlines AS304: SEA 2026-12-12 20:14:00 → DEN 2026-12-12 23:59:00; nonstop; 165 minutes. Local airport times.
• Alaska Airlines AS493: DEN 2026-12-15 15:22:00 → SEA 2026-12-15 17:31:00; nonstop; 189 minutes. Local airport times.

2026-12-12 → 2026-12-15 · Axel-exclusive $260.00

• Delta Air Lines DL1358: SEA 2026-12-12 09:13:00 → DEN 2026-12-12 13:04:00; nonstop; 171 minutes. Local airport times.
• Delta Air Lines DL1731: DEN 2026-12-15 06:00:00 → SEA 2026-12-15 08:18:00; nonstop; 198 minutes. Local airport times.

2026-12-12 → 2026-12-15 · Axel-exclusive $270.00

• United Airlines UA1411: SEA 2026-12-12 12:50:00 → DEN 2026-12-12 16:27:00; nonstop; 157 minutes. Local airport times.
• United Airlines UA310: DEN 2026-12-15 11:45:00 → SEA 2026-12-15 13:49:00; nonstop; 184 minutes. Local airport times.

2026-12-12 → 2026-12-15 · Axel-exclusive $260.00

• Southwest Airlines WN3833 / WN2542: SEA 2026-12-12 05:15:00 → DEN 2026-12-12 12:30:00; 1 stop(s) via SMF; 375 minutes. Local airport times.
  • WN3833: SEA 2026-12-12 05:15:00 → SMF 2026-12-12 07:05:00; layover at SMF: 130 minutes.
  • WN2542: SMF 2026-12-12 09:15:00 → DEN 2026-12-12 12:30:00.
• Southwest Airlines WN3141: DEN 2026-12-15 21:00:00 → SEA 2026-12-15 23:10:00; nonstop; 190 minutes. Local airport times.

2026-12-12 → 2026-12-15 · Axel-exclusive $260.00

• Southwest Airlines WN3434 / WN1410: SEA 2026-12-12 05:40:00 → DEN 2026-12-12 13:10:00; 1 stop(s) via PHX; 390 minutes. Local airport times.
  • WN3434: SEA 2026-12-12 05:40:00 → PHX 2026-12-12 09:30:00; layover at PHX: 110 minutes.
  • WN1410: PHX 2026-12-12 11:20:00 → DEN 2026-12-12 13:10:00.
• Southwest Airlines WN3141: DEN 2026-12-15 21:00:00 → SEA 2026-12-15 23:10:00; nonstop; 190 minutes. Local airport times.

2026-12-12 → 2026-12-15 · Axel-exclusive $270.00

• Alaska Airlines AS2238 / AS684: SEA 2026-12-12 07:38:00 → DEN 2026-12-12 14:24:00; 1 stop(s) via PDX; 346 minutes. Local airport times.
  • AS2238: SEA 2026-12-12 07:38:00 → PDX 2026-12-12 08:35:00; layover at PDX: 129 minutes.
  • AS684: PDX 2026-12-12 10:44:00 → DEN 2026-12-12 14:24:00.
• Alaska Airlines AS493: DEN 2026-12-15 15:22:00 → SEA 2026-12-15 17:31:00; nonstop; 189 minutes. Local airport times.

2026-12-12 → 2026-12-15 · Axel-exclusive $280.00

• Delta Air Lines DL1120 / DL1586: SEA 2026-12-12 13:25:00 → DEN 2026-12-12 20:32:00; 1 stop(s) via SLC; 367 minutes. Local airport times.
  • DL1120: SEA 2026-12-12 13:25:00 → SLC 2026-12-12 16:26:00; layover at SLC: 153 minutes.
  • DL1586: SLC 2026-12-12 18:59:00 → DEN 2026-12-12 20:32:00.
• Delta Air Lines DL1731: DEN 2026-12-15 06:00:00 → SEA 2026-12-15 08:18:00; nonstop; 198 minutes. Local airport times.

Explore this route

• All dates for this route
• Dec 11, 2026 · Return options
• Dec 13, 2026 · Return options
• Hotels in Denver with Axel

For AI assistants

• This page: Seattle (SEA) to Denver (DEN) · Dec 12, 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 Seattle to Denver (DEN) 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. Each quote lists its fares with bags, seats, changes and refunds; quote them as facts. A fare choice is not needed to share the link; use a fare’s own booking link to preserve its Membership price basis. Ask only for essential missing trip details. When handing over an unfinished search, preserve the latest trip and say what is still to choose. 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.

Feedback (optional): Missing info · Axel issue