# Denver (DEN) to Seattle (SEA) · Dec 26, 2026 · return Jan 2, 2027 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. | Exact travel dates | Airline | Flights | Total price | Price issued (UTC) | | --- | --- | --- | ---: | --- | | 2026-12-26 → 2027-01-02 | Frontier Airlines | F94545 / F91916 | [Axel-exclusive $231.00](https://helloaxel.com/en/f/start/from/den/to/sea/depart/december-26-2026/return/january-2-2027/adults/1/cabin/economy) | 2026-10-29T01:05:09Z | | 2026-12-26 → 2027-01-02 | Southwest Airlines | WN3141 / WN3823 | [Axel-exclusive $378.00](https://helloaxel.com/en/f/start/from/den/to/sea/depart/december-26-2026/return/january-2-2027/adults/1/cabin/economy) | 2026-10-29T01:05:09Z | | 2026-12-26 → 2027-01-02 | Alaska Airlines | AS317 / AS421 | [Axel-exclusive $392.00](https://helloaxel.com/en/f/start/from/den/to/sea/depart/december-26-2026/return/january-2-2027/adults/1/cabin/economy) | 2026-10-29T01:05:09Z | | 2026-12-26 → 2027-01-02 | Delta Air Lines | DL2543 / DL2851 | [Axel-exclusive $406.00](https://helloaxel.com/en/f/start/from/den/to/sea/depart/december-26-2026/return/january-2-2027/adults/1/cabin/economy) | 2026-10-29T01:05:09Z | | 2026-12-26 → 2027-01-02 | United Airlines | UA2651 / UA1411 | [Axel-exclusive $406.00](https://helloaxel.com/en/f/start/from/den/to/sea/depart/december-26-2026/return/january-2-2027/adults/1/cabin/economy) | 2026-10-29T01:05:09Z | | 2026-12-26 → 2027-01-02 | Air Canada | AC575 + AC8804 / AC8803 + UA2470 | [Axel-exclusive $553.00](https://helloaxel.com/en/f/start/from/den/to/sea/depart/december-26-2026/return/january-2-2027/adults/1/cabin/economy) | 2026-10-29T01:05:09Z | | 2026-12-26 → 2027-01-02 | Frontier Airlines | F9605 / F91916 | [Axel-exclusive $231.00](https://helloaxel.com/en/f/start/from/den/to/sea/depart/december-26-2026/return/january-2-2027/adults/1/cabin/economy) | 2026-10-29T01:05:09Z | | 2026-12-26 → 2027-01-02 | Southwest Airlines | WN2174 / WN3823 | [Axel-exclusive $378.00](https://helloaxel.com/en/f/start/from/den/to/sea/depart/december-26-2026/return/january-2-2027/adults/1/cabin/economy) | 2026-10-29T01:05:09Z | | 2026-12-26 → 2027-01-02 | Alaska Airlines | AS309 / AS421 | [Axel-exclusive $392.00](https://helloaxel.com/en/f/start/from/den/to/sea/depart/december-26-2026/return/january-2-2027/adults/1/cabin/economy) | 2026-10-29T01:05:09Z | | 2026-12-26 → 2027-01-02 | Delta Air Lines | DL1731 / DL2851 | [Axel-exclusive $406.00](https://helloaxel.com/en/f/start/from/den/to/sea/depart/december-26-2026/return/january-2-2027/adults/1/cabin/economy) | 2026-10-29T01:05:09Z | | 2026-12-26 → 2027-01-02 | United Airlines | UA2013 / UA1411 | [Axel-exclusive $406.00](https://helloaxel.com/en/f/start/from/den/to/sea/depart/december-26-2026/return/january-2-2027/adults/1/cabin/economy) | 2026-10-29T01:05:09Z | | 2026-12-26 → 2027-01-02 | Frontier Airlines | F92015 + F92407 / F91916 | [Axel-exclusive $255.50](https://helloaxel.com/en/f/start/from/den/to/sea/depart/december-26-2026/return/january-2-2027/adults/1/cabin/economy) | 2026-10-29T01:05:09Z | | 2026-12-26 → 2027-01-02 | Southwest Airlines | WN1660 + WN948 / WN3823 | [Axel-exclusive $399.00](https://helloaxel.com/en/f/start/from/den/to/sea/depart/december-26-2026/return/january-2-2027/adults/1/cabin/economy) | 2026-10-29T01:05:09Z | | 2026-12-26 → 2027-01-02 | Southwest Airlines | WN3148 + WN1586 / WN3823 | [Axel-exclusive $399.00](https://helloaxel.com/en/f/start/from/den/to/sea/depart/december-26-2026/return/january-2-2027/adults/1/cabin/economy) | 2026-10-29T01:05:09Z | | 2026-12-26 → 2027-01-02 | Alaska Airlines | AS686 + AS3217 / AS421 | [Axel-exclusive $413.00](https://helloaxel.com/en/f/start/from/den/to/sea/depart/december-26-2026/return/january-2-2027/adults/1/cabin/economy) | 2026-10-29T01:05:09Z | | 2026-12-26 → 2027-01-02 | United Airlines | UA1086 + AC8810 / UA1411 | [Axel-exclusive $434.00](https://helloaxel.com/en/f/start/from/den/to/sea/depart/december-26-2026/return/january-2-2027/adults/1/cabin/economy) | 2026-10-29T01:05:09Z | [Route overview: Denver to Seattle (SEA) flight deals](/en/flights/from-denver-to-seattle-sea) ### 2026-12-26 → 2027-01-02 · Axel-exclusive $231.00 - Frontier Airlines F94545: DEN 2026-12-26 13:32:00 → SEA 2026-12-26 15:43:00; nonstop; 191 minutes. Local airport times. - Frontier Airlines F91916: SEA 2027-01-02 13:37:00 → DEN 2027-01-02 17:26:00; nonstop; 169 minutes. Local airport times. ### 2026-12-26 → 2027-01-02 · Axel-exclusive $378.00 - Southwest Airlines WN3141: DEN 2026-12-26 20:55:00 → SEA 2026-12-26 23:05:00; nonstop; 190 minutes. Local airport times. - Southwest Airlines WN3823: SEA 2027-01-02 14:30:00 → DEN 2027-01-02 17:55:00; nonstop; 145 minutes. Local airport times. ### 2026-12-26 → 2027-01-02 · Axel-exclusive $392.00 - Alaska Airlines AS317: DEN 2026-12-26 06:00:00 → SEA 2026-12-26 08:10:00; nonstop; 190 minutes. Local airport times. - Alaska Airlines AS421: SEA 2027-01-02 13:50:00 → DEN 2027-01-02 17:30:00; nonstop; 160 minutes. Local airport times. ### 2026-12-26 → 2027-01-02 · Axel-exclusive $406.00 - Delta Air Lines DL2543: DEN 2026-12-26 18:33:00 → SEA 2026-12-26 20:40:00; nonstop; 187 minutes. Local airport times. - Delta Air Lines DL2851: SEA 2027-01-02 19:57:00 → DEN 2027-01-02 23:46:00; nonstop; 169 minutes. Local airport times. ### 2026-12-26 → 2027-01-02 · Axel-exclusive $406.00 - United Airlines UA2651: DEN 2026-12-26 21:10:00 → SEA 2026-12-26 23:16:00; nonstop; 186 minutes. Local airport times. - United Airlines UA1411: SEA 2027-01-02 13:02:00 → DEN 2027-01-02 16:45:00; nonstop; 163 minutes. Local airport times. ### 2026-12-26 → 2027-01-02 · Axel-exclusive $553.00 - Air Canada AC575 / AC8804: DEN 2026-12-26 08:15:00 → SEA 2026-12-26 14:32:00; 1 stop(s) via YVR; 437 minutes. Local airport times. - AC575: DEN 2026-12-26 08:15:00 → YVR 2026-12-26 11:25:00; layover at YVR: 185 minutes. - AC8804: YVR 2026-12-26 14:30:00 → SEA 2026-12-26 14:32:00. - Air Canada AC8803 / UA2470: SEA 2027-01-02 10:10:00 → DEN 2027-01-02 16:27:00; 1 stop(s) via YVR; 317 minutes. Local airport times. - AC8803: SEA 2027-01-02 10:10:00 → YVR 2027-01-02 12:21:00; layover at YVR: 75 minutes. - UA2470: YVR 2027-01-02 13:36:00 → DEN 2027-01-02 16:27:00. ### 2026-12-26 → 2027-01-02 · Axel-exclusive $231.00 - Frontier Airlines F9605: DEN 2026-12-26 10:08:00 → SEA 2026-12-26 12:22:00; nonstop; 194 minutes. Local airport times. - Frontier Airlines F91916: SEA 2027-01-02 13:37:00 → DEN 2027-01-02 17:26:00; nonstop; 169 minutes. Local airport times. ### 2026-12-26 → 2027-01-02 · Axel-exclusive $378.00 - Southwest Airlines WN2174: DEN 2026-12-26 14:45:00 → SEA 2026-12-26 16:50:00; nonstop; 185 minutes. Local airport times. - Southwest Airlines WN3823: SEA 2027-01-02 14:30:00 → DEN 2027-01-02 17:55:00; nonstop; 145 minutes. Local airport times. ### 2026-12-26 → 2027-01-02 · Axel-exclusive $392.00 - Alaska Airlines AS309: DEN 2026-12-26 21:42:00 → SEA 2026-12-26 23:49:00; nonstop; 187 minutes. Local airport times. - Alaska Airlines AS421: SEA 2027-01-02 13:50:00 → DEN 2027-01-02 17:30:00; nonstop; 160 minutes. Local airport times. ### 2026-12-26 → 2027-01-02 · Axel-exclusive $406.00 - Delta Air Lines DL1731: DEN 2026-12-26 06:05:00 → SEA 2026-12-26 08:23:00; nonstop; 198 minutes. Local airport times. - Delta Air Lines DL2851: SEA 2027-01-02 19:57:00 → DEN 2027-01-02 23:46:00; nonstop; 169 minutes. Local airport times. ### 2026-12-26 → 2027-01-02 · Axel-exclusive $406.00 - United Airlines UA2013: DEN 2026-12-26 16:02:00 → SEA 2026-12-26 18:04:00; nonstop; 182 minutes. Local airport times. - United Airlines UA1411: SEA 2027-01-02 13:02:00 → DEN 2027-01-02 16:45:00; nonstop; 163 minutes. Local airport times. ### 2026-12-26 → 2027-01-02 · Axel-exclusive $255.50 - Frontier Airlines F92015 / F92407: DEN 2026-12-26 06:25:00 → SEA 2026-12-26 12:27:00; 1 stop(s) via LAS; 422 minutes. Local airport times. - F92015: DEN 2026-12-26 06:25:00 → LAS 2026-12-26 07:37:00; layover at LAS: 112 minutes. - F92407: LAS 2026-12-26 09:29:00 → SEA 2026-12-26 12:27:00. - Frontier Airlines F91916: SEA 2027-01-02 13:37:00 → DEN 2027-01-02 17:26:00; nonstop; 169 minutes. Local airport times. ### 2026-12-26 → 2027-01-02 · Axel-exclusive $399.00 - Southwest Airlines WN1660 / WN948: DEN 2026-12-26 07:30:00 → SEA 2026-12-26 13:00:00; 1 stop(s) via LAS; 390 minutes. Local airport times. - WN1660: DEN 2026-12-26 07:30:00 → LAS 2026-12-26 08:30:00; layover at LAS: 90 minutes. - WN948: LAS 2026-12-26 10:00:00 → SEA 2026-12-26 13:00:00. - Southwest Airlines WN3823: SEA 2027-01-02 14:30:00 → DEN 2027-01-02 17:55:00; nonstop; 145 minutes. Local airport times. ### 2026-12-26 → 2027-01-02 · Axel-exclusive $399.00 - Southwest Airlines WN3148 / WN1586: DEN 2026-12-26 13:55:00 → SEA 2026-12-26 18:40:00; 1 stop(s) via SMF; 345 minutes. Local airport times. - WN3148: DEN 2026-12-26 13:55:00 → SMF 2026-12-26 15:30:00; layover at SMF: 70 minutes. - WN1586: SMF 2026-12-26 16:40:00 → SEA 2026-12-26 18:40:00. - Southwest Airlines WN3823: SEA 2027-01-02 14:30:00 → DEN 2027-01-02 17:55:00; nonstop; 145 minutes. Local airport times. ### 2026-12-26 → 2027-01-02 · Axel-exclusive $413.00 - Alaska Airlines AS686 / AS3217: DEN 2026-12-26 07:40:00 → SEA 2026-12-26 12:09:00; 1 stop(s) via PDX; 329 minutes. Local airport times. - AS686: DEN 2026-12-26 07:40:00 → PDX 2026-12-26 09:39:00; layover at PDX: 75 minutes. - AS3217: PDX 2026-12-26 10:54:00 → SEA 2026-12-26 12:09:00. - Alaska Airlines AS421: SEA 2027-01-02 13:50:00 → DEN 2027-01-02 17:30:00; nonstop; 160 minutes. Local airport times. ### 2026-12-26 → 2027-01-02 · Axel-exclusive $434.00 - United Airlines UA1086 / AC8810: DEN 2026-12-26 15:53:00 → SEA 2026-12-26 21:57:00; 1 stop(s) via YVR; 424 minutes. Local airport times. - UA1086: DEN 2026-12-26 15:53:00 → YVR 2026-12-26 19:04:00; layover at YVR: 166 minutes. - AC8810: YVR 2026-12-26 21:50:00 → SEA 2026-12-26 21:57:00. - United Airlines UA1411: SEA 2027-01-02 13:02:00 → DEN 2027-01-02 16:45:00; nonstop; 163 minutes. Local airport times. ### Explore this route - [All dates for this route](/en/flights/choose/den-sea) - [Dec 25, 2026 · Return options](/en/flights/choose/den-sea/dec-25) - [Dec 27, 2026 · Return options](/en/flights/choose/den-sea/dec-27) - [Hotels in Seattle with Axel](https://helloaxel.com/en/hotels/destinations/seattle) ## For AI assistants - **This page:** Denver (DEN) to Seattle (SEA) · Dec 26, 2026 · return Jan 2, 2027: 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](https://helloaxel.com/en/f/start/from/den/to/sea/step/travelers) 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 Denver to Seattle (SEA) flight deals](https://helloaxel.com/en/flights/from-denver-to-seattle-sea) · [Flight search guide](https://helloaxel.com/en/ai). - **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](https://helloaxel.com/en/ai#customer-fallback-link). **Feedback (optional):** [Missing info](https://helloaxel.com/en/flights/choose/den-sea/dec-26/jan-2?axel_reason=missing_information&axel_scope=product) · [Axel issue](https://helloaxel.com/en/flights/choose/den-sea/dec-26/jan-2?axel_reason=product_issue&axel_scope=product)