--- title: "Seattle (SEA) to Denver (DEN) flights: who flies it" description: "Alaska Airlines, Delta Air Lines and 2 more airlines fly nonstop from SEA to DEN, about 84 flights a week. Upgrade and award space by date on 2LNR, next 14 days free." canonical: "https://2lnr.com/routes/sea-den" url: "https://2lnr.com/routes/sea-den.md" date_modified: "2026-10-18T05:10:47Z" --- # Seattle to Denver (SEA-DEN): nonstop upgrade & award space United Airlines, Alaska Airlines, Delta Air Lines, and Frontier Airlines fly nonstop between Seattle (SEA) and Denver (DEN), roughly 84 times a week. The timetable below shows the nonstop scheduled at 2h 41m to 2h 55m for the 1,022 miles. 2LNR checks confirmed upgrade and award space on Alaska Airlines and Delta Air Lines flights on this route, so you can see which departures have space before you book. Schedule last confirmed October 18, 2026. Departure times come from 2LNR's schedule data; confirm with the airline before you book. Updated October 23, 2026. See SEA to DEN on the interactive map [Get started free](https://2lnr.com/login) 84 Flights a week, 4-week average 2h 41m to 2h 55m Scheduled flight time 1,022 mi Nonstop distance Free To get started ## Seattle to Denver flight schedule Scheduled nonstop departures for SEA to DEN starting October 23, 2026, last checked against our schedule feed on October 18, 2026. Airlines retime and cancel flights, so confirm with the airline before you book. Scheduled nonstop departures from Seattle (SEA) to Denver (DEN) | Date | Flight | Airline | Departs SEA | Arrives DEN | Duration | Aircraft | | :--- | :--- | :--- | :--- | :--- | :--- | :--- | | Fri, Oct 23 | UA 2601 | United Airlines | 05:00 | 08:45 | 2h 45m | [Airbus A321neo family](https://2lnr.com/seatmaps/ua/a321neo.md) | | Fri, Oct 23 | AS 682 | Alaska Airlines, Inc. | 07:08 | 11:02 | 2h 54m | [Boeing 737-900](https://2lnr.com/seatmaps/as/737-900.md) | | Fri, Oct 23 | UA 1505 | United Airlines | 08:30 | 12:22 | 2h 52m | [Boeing 737-800](https://2lnr.com/seatmaps/ua/737-800.md) | | Fri, Oct 23 | DL 1358 | Delta Air Lines | 09:05 | 12:49 | 2h 44m | [Airbus A220-300](https://2lnr.com/seatmaps/dl/a220-300.md) | | Fri, Oct 23 | AS 535 | Alaska Airlines, Inc. | 10:13 | 14:08 | 2h 55m | Boeing 737-900 | | Fri, Oct 23 | UA 2033 | United Airlines | 12:43 | 16:34 | 2h 51m | Airbus A321neo family | | Fri, Oct 23 | AS 602 | Alaska Airlines, Inc. | 13:16 | 16:59 | 2h 43m | Boeing 737-900 | | Fri, Oct 23 | DL 2543 | Delta Air Lines | 13:55 | 17:47 | 2h 52m | Airbus A220-300 | | Fri, Oct 23 | UA 333 | United Airlines | 14:27 | 18:17 | 2h 50m | [Boeing 737 MAX 8](https://2lnr.com/seatmaps/ua/737-max-8.md) | | Fri, Oct 23 | UA 757 | United Airlines | 15:55 | 19:45 | 2h 50m | [Boeing 737 MAX 9](https://2lnr.com/seatmaps/ua/737-max-9.md) | | Fri, Oct 23 | F9 3406 | Frontier Airlines | 16:27 | 20:17 | 2h 50m | [Airbus A321neo family](https://2lnr.com/seatmaps/f9/a321neo.md) | | Fri, Oct 23 | UA 1218 | United Airlines | 18:05 | 21:49 | 2h 44m | Airbus A321neo family | | Fri, Oct 23 | AS 310 | Alaska Airlines, Inc. | 18:54 | 22:37 | 2h 43m | Boeing 737-900 | | Fri, Oct 23 | DL 2851 | Delta Air Lines | 20:00 | 23:55 | 2h 55m | Airbus A220-300 | | Sat, Oct 24 | UA 2601 | United Airlines | 05:00 | 08:45 | 2h 45m | Airbus A321neo family | | Sat, Oct 24 | AS 682 | Alaska Airlines, Inc. | 07:08 | 11:02 | 2h 54m | [Boeing 737 MAX 9](https://2lnr.com/seatmaps/as/737-max-9.md) | | Sat, Oct 24 | UA 1505 | United Airlines | 08:30 | 12:22 | 2h 52m | Boeing 737-800 | | Sat, Oct 24 | DL 1358 | Delta Air Lines | 09:05 | 12:49 | 2h 44m | Airbus A220-300 | | Sat, Oct 24 | AS 535 | Alaska Airlines, Inc. | 10:13 | 14:08 | 2h 55m | Boeing 737 MAX 9 | | Sat, Oct 24 | AS 602 | Alaska Airlines, Inc. | 13:16 | 16:59 | 2h 43m | Boeing 737-900 | | Sat, Oct 24 | DL 2543 | Delta Air Lines | 13:55 | 17:47 | 2h 52m | Airbus A220-300 | | Sat, Oct 24 | UA 757 | United Airlines | 15:55 | 19:45 | 2h 50m | Boeing 737 MAX 9 | | Sat, Oct 24 | F9 3406 | Frontier Airlines | 16:27 | 20:17 | 2h 50m | Airbus A321neo family | | Sat, Oct 24 | AS 310 | Alaska Airlines, Inc. | 18:54 | 22:37 | 2h 43m | Boeing 737-900 | | Sat, Oct 24 | DL 2851 | Delta Air Lines | 20:00 | 23:55 | 2h 55m | Airbus A220-300 | | Sun, Oct 25 | AS 682 | Alaska Airlines, Inc. | 07:08 | 11:02 | 2h 54m | Boeing 737-900 | | Sun, Oct 25 | UA 1505 | United Airlines | 08:30 | 12:22 | 2h 52m | Boeing 737-800 | | Sun, Oct 25 | DL 1358 | Delta Air Lines | 09:05 | 12:49 | 2h 44m | Airbus A220-300 | | Sun, Oct 25 | AS 535 | Alaska Airlines, Inc. | 10:13 | 14:08 | 2h 55m | Boeing 737 MAX 9 | | Sun, Oct 25 | UA 1534 | United Airlines | 12:44 | 16:35 | 2h 51m | Airbus A321neo family | | Sun, Oct 25 | AS 602 | Alaska Airlines, Inc. | 13:16 | 16:59 | 2h 43m | Boeing 737-900 | | Sun, Oct 25 | DL 2543 | Delta Air Lines | 13:55 | 17:47 | 2h 52m | Airbus A220-300 | | Sun, Oct 25 | UA 725 | United Airlines | 15:02 | 18:43 | 2h 41m | [Boeing 737-900](https://2lnr.com/seatmaps/ua/737-900.md) | | Sun, Oct 25 | UA 1194 | United Airlines | 15:51 | 19:35 | 2h 44m | Boeing 737-800 | | Sun, Oct 25 | UA 757 | United Airlines | 15:54 | 19:45 | 2h 51m | Boeing 737 MAX 8 | | Sun, Oct 25 | F9 3406 | Frontier Airlines | 16:27 | 20:17 | 2h 50m | Airbus A321neo family | | Sun, Oct 25 | AS 310 | Alaska Airlines, Inc. | 18:54 | 22:37 | 2h 43m | Boeing 737-900 | | Sun, Oct 25 | UA 1218 | United Airlines | 19:04 | 22:45 | 2h 41m | Boeing 737-800 | | Sun, Oct 25 | DL 2851 | Delta Air Lines | 20:00 | 23:55 | 2h 55m | Airbus A220-300 | | Mon, Oct 26 | AS 682 | Alaska Airlines, Inc. | 07:08 | 11:02 | 2h 54m | Boeing 737-900 | Showing the first 40 of 89 scheduled SEA to DEN departures across 7 days with service, starting October 23, 2026. Every remaining date is on the interactive map. Departure and arrival times are local at their own airport, so an arrival can fall on a different local date than the departure; the duration column is the true elapsed flying time. A dash means the airline hasn't filed that value in the schedule data we hold. Aircraft are the equipment the airline filed, named where the code pins down one type and shown as the family or the bare code where it doesn't. Swaps can happen up to departure. See every SEA to DEN date on the interactive map ## Aircraft on the Seattle to Denver nonstop In the schedule table on this page, United Airlines flies the [Airbus A321neo family](https://2lnr.com/seatmaps/ua/a321neo.md), the [Boeing 737-800](https://2lnr.com/seatmaps/ua/737-800.md), the [Boeing 737 MAX 8](https://2lnr.com/seatmaps/ua/737-max-8.md), the [Boeing 737 MAX 9](https://2lnr.com/seatmaps/ua/737-max-9.md), and the [Boeing 737-900](https://2lnr.com/seatmaps/ua/737-900.md). Alaska Airlines flies the [Boeing 737-900](https://2lnr.com/seatmaps/as/737-900.md) and the [Boeing 737 MAX 9](https://2lnr.com/seatmaps/as/737-max-9.md). Delta Air Lines flies the [Airbus A220-300](https://2lnr.com/seatmaps/dl/a220-300.md). Frontier Airlines flies the [Airbus A321neo family](https://2lnr.com/seatmaps/f9/a321neo.md). Each linked aircraft page shows where that airline schedules it. Airlines can swap aircraft up to departure. ## Confirmed upgrade & award space on SEA to DEN departures 2LNR tracks confirmed upgrade and award space on Alaska Airlines and Delta Air Lines, segment by segment and date by date. Open the calendar for Seattle to Denver to see which departures have space, the next 14 days free on every product and the full horizon on Pro. In the 7 days to October 19, 2026, 2LNR checked award space on Seattle to Denver departures from October 19 to November 1. Alaska Airlines had space open on 9 of 14 dates checked and Delta Air Lines on 14 of 14. ### See real availability Confirmed upgrade or award seats by date on the SEA to DEN departures 2LNR tracks, checked against live inventory so you know what's open before you book. ### Set an alert Premium inventory turns over fast. Watch this route on Pro and 2LNR notifies you when space appears on a date you're tracking. ### Plan on the map See SEA to DEN on the interactive route map, with schedules, connections, and route statistics. ## Airlines flying Seattle to Denver nonstop Carriers operating SEA to DEN nonstop in the current schedule. Where 2LNR tracks the carrier, its departures show confirmed upgrade or award space by date. - [United Airlines (UA) route map](https://2lnr.com/routes/airlines/ua.md)\ [The aircraft UA flies](https://2lnr.com/seatmaps/ua.md) - [Alaska Airlines (AS) route map](https://2lnr.com/routes/airlines/as.md)\ [The aircraft AS flies](https://2lnr.com/seatmaps/as.md) - [Delta Air Lines (DL) route map](https://2lnr.com/routes/airlines/dl.md)\ [The aircraft DL flies](https://2lnr.com/seatmaps/dl.md) - [Frontier Airlines (F9) route map](https://2lnr.com/routes/airlines/f9.md)\ [The aircraft F9 flies](https://2lnr.com/seatmaps/f9.md) See SEA to DEN on the interactive map → ## Frequently asked questions about SEA to DEN **How long is the flight from Seattle (SEA) to Denver (DEN)?** Scheduled flight times from Seattle (SEA) to Denver (DEN) run from 2h 41m to 2h 55m across the departures in the schedule table on this page. The nonstop covers about 1,022 miles, and airlines adjust scheduled times by season, so confirm with the airline before you book. **Which airlines fly nonstop from SEA to DEN?** United Airlines, Alaska Airlines, Delta Air Lines, and Frontier Airlines fly SEA to DEN nonstop. 2LNR tracks confirmed upgrade and award space on Alaska Airlines and Delta Air Lines. **How many flights a week are there from SEA to DEN?** About 84 nonstop flights a week run between Seattle (SEA) and Denver (DEN) in the current schedule, operated by United Airlines, Alaska Airlines, Delta Air Lines, and Frontier Airlines. Frequency shifts by season, and the schedule table on this page shows what is scheduled next. **What time do flights from SEA to DEN depart?** Scheduled SEA to DEN nonstops in the next 7 days with service leave between 05:00 and 20:00, local time at Seattle. The schedule table on this page lists every departure by date, with its arrival time and aircraft. **Which flights operate SEA to DEN nonstop?** The schedule table on this page lists 17 flight numbers for SEA to DEN nonstops, including UA 757 and UA 1505 on United Airlines; AS 535, AS 602, and AS 682 on Alaska Airlines; DL 1358 and DL 2543 on Delta Air Lines; and F9 3406 on Frontier Airlines. The table lists each departure by date with its times and aircraft. **How do I check upgrade or award availability on SEA to DEN?** Open the SEA to DEN route on the interactive map or the matrix to see confirmed upgrade and award space by date on Alaska Airlines and Delta Air Lines, the next 14 days free and the full horizon on Pro. On Pro you can also set an alert on the route and 2LNR notifies you when space opens. Flying the other way? See [DEN to SEA upgrade and award space](https://2lnr.com/routes/den-sea.md). Award seats rather than schedules? See [Alaska Airlines award availability](https://2lnr.com/awards/as.md) or [Delta Air Lines award availability](https://2lnr.com/awards/dl.md). Looking beyond this route? See [every route from Seattle (SEA)](https://2lnr.com/routes/sea.md), or [every route from Denver (DEN)](https://2lnr.com/routes/den.md). Nonstops to Denver (DEN) from other airports within 150 miles of Seattle (SEA): - [Vancouver (YVR) to Denver (DEN)](https://2lnr.com/routes/yvr-den.md), 127 miles from SEA - [Portland (PDX) to Denver (DEN)](https://2lnr.com/routes/pdx-den.md), 129 miles from SEA Nonstops from Seattle (SEA) to other airports within 150 miles of Denver (DEN): - [Seattle (SEA) to Eagle (EGE)](https://2lnr.com/routes/sea-ege.md), 119 miles from DEN - [Seattle (SEA) to Hayden (HDN)](https://2lnr.com/routes/sea-hdn.md), 141 miles from DEN Distances are great-circle between the airports, not driving distance. - [How Alaska upgrades clear](https://2lnr.com/about/as/upgrades.md) - [How to read award availability by date](https://2lnr.com/guides/award-availability.md) ## Never miss SEA to DEN upgrade or award space See what's open by date on this route, the next 14 days free on every product and the full horizon on Pro. [Get started free](https://2lnr.com/login)