--- title: "St. Louis (STL) to Seattle (SEA) flights: who flies it" description: "Alaska Airlines flies nonstop from STL to SEA, about 12 flights a week. See confirmed upgrade and award space by date on 2LNR, the next 14 days free." canonical: "https://2lnr.com/routes/stl-sea" url: "https://2lnr.com/routes/stl-sea.md" date_modified: "2026-10-18T05:10:47Z" --- # St. Louis to Seattle (STL-SEA): nonstop upgrade & award space Alaska Airlines flies the STL to SEA nonstop about 12 times a week. In the timetable below it flies as AS 314 and AS 473, scheduled at 4h 28m to 4h 33m for the 1,705 miles. 2LNR checks confirmed upgrade and award space on Alaska Airlines 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 24, 2026. See STL to SEA on the interactive map [Get started free](https://2lnr.com/login) 12 Flights a week, 4-week average 4h 28m to 4h 33m Scheduled flight time 1,705 mi Nonstop distance Free To get started ## St. Louis to Seattle flight schedule Scheduled nonstop departures for STL to SEA 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 St. Louis (STL) to Seattle (SEA) | Date | Flight | Airline | Departs STL | Arrives SEA | Duration | Aircraft | | :--- | :--- | :--- | :--- | :--- | :--- | :--- | | Fri, Oct 23 | AS 473 | Alaska Airlines, Inc. | 07:02 | 09:35 | 4h 33m | [Boeing 737-800](https://2lnr.com/seatmaps/as/737-800.md) | | Fri, Oct 23 | AS 314 | Alaska Airlines, Inc. | 16:42 | 19:10 | 4h 28m | [Boeing 737 MAX 9](https://2lnr.com/seatmaps/as/737-max-9.md) | | Sat, Oct 24 | AS 473 | Alaska Airlines, Inc. | 06:02 | 08:33 | 4h 31m | Boeing 737 MAX 9 | | Sat, Oct 24 | AS 314 | Alaska Airlines, Inc. | 16:42 | 19:10 | 4h 28m | Boeing 737 MAX 9 | | Sun, Oct 25 | AS 473 | Alaska Airlines, Inc. | 07:02 | 09:35 | 4h 33m | Boeing 737 MAX 9 | | Sun, Oct 25 | AS 314 | Alaska Airlines, Inc. | 16:42 | 19:10 | 4h 28m | Boeing 737 MAX 9 | | Mon, Oct 26 | AS 473 | Alaska Airlines, Inc. | 07:02 | 09:35 | 4h 33m | Boeing 737-800 | | Mon, Oct 26 | AS 314 | Alaska Airlines, Inc. | 16:42 | 19:10 | 4h 28m | Boeing 737-800 | | Tue, Oct 27 | AS 473 | Alaska Airlines, Inc. | 07:02 | 09:35 | 4h 33m | [Boeing 737-900](https://2lnr.com/seatmaps/as/737-900.md) | | Tue, Oct 27 | AS 314 | Alaska Airlines, Inc. | 16:42 | 19:10 | 4h 28m | Boeing 737-900 | | Wed, Oct 28 | AS 473 | Alaska Airlines, Inc. | 07:02 | 09:35 | 4h 33m | Boeing 737-800 | | Wed, Oct 28 | AS 314 | Alaska Airlines, Inc. | 16:42 | 19:10 | 4h 28m | Boeing 737-900 | | Thu, Oct 29 | AS 473 | Alaska Airlines, Inc. | 07:02 | 09:35 | 4h 33m | Boeing 737-800 | | Thu, Oct 29 | AS 314 | Alaska Airlines, Inc. | 16:42 | 19:10 | 4h 28m | Boeing 737-900 | Showing all 14 scheduled STL to SEA departures across 7 days with service, starting October 23, 2026. Later dates are 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 STL to SEA date on the interactive map ## Aircraft on the St. Louis to Seattle nonstop Alaska Airlines flies the departures in the schedule table on this page with the [Boeing 737-800](https://2lnr.com/seatmaps/as/737-800.md), the [Boeing 737 MAX 9](https://2lnr.com/seatmaps/as/737-max-9.md), and the [Boeing 737-900](https://2lnr.com/seatmaps/as/737-900.md). Each linked aircraft page shows where that airline schedules it. Airlines can swap aircraft up to departure. ## Confirmed upgrade & award space on STL to SEA departures 2LNR tracks confirmed upgrade and award space on Alaska Airlines, segment by segment and date by date. Open the calendar for St. Louis to Seattle to see which departures have space, the next 14 days free on every product and the full horizon on Pro. Alaska Airlines award space was open on 5 of the 14 St. Louis to Seattle departure dates from October 19 to November 1 that 2LNR checked in the 7 days to October 19, 2026. ### See real availability Confirmed upgrade or award seats by date on the STL to SEA 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 STL to SEA on the interactive route map, with schedules, connections, and route statistics. ## Airlines flying St. Louis to Seattle nonstop Carriers operating STL to SEA nonstop in the current schedule. Where 2LNR tracks the carrier, its departures show confirmed upgrade or award space by date. - [Alaska Airlines (AS) route map](https://2lnr.com/routes/airlines/as.md)\ [The aircraft AS flies](https://2lnr.com/seatmaps/as.md) See STL to SEA on the interactive map → ## Frequently asked questions about STL to SEA **How long is the flight from St. Louis (STL) to Seattle (SEA)?** Scheduled flight times from St. Louis (STL) to Seattle (SEA) run from 4h 28m to 4h 33m across the departures in the schedule table on this page. The nonstop covers about 1,705 miles, and airlines adjust scheduled times by season, so confirm with the airline before you book. **Which airlines fly nonstop from STL to SEA?** Alaska Airlines is currently the only airline flying STL to SEA nonstop. 2LNR tracks confirmed upgrade and award space on Alaska Airlines. **How many flights a week are there from STL to SEA?** About 12 nonstop flights a week run between St. Louis (STL) and Seattle (SEA) in the current schedule, operated by Alaska Airlines. Frequency shifts by season, and the schedule table on this page shows what is scheduled next. **What time do flights from STL to SEA depart?** Scheduled STL to SEA nonstops in the next 7 days with service leave between 06:02 and 16:42, local time at St. Louis. The schedule table on this page lists every departure by date, with its arrival time and aircraft. **Which flights operate STL to SEA nonstop?** In the schedule table on this page, STL to SEA nonstops fly as AS 314 and AS 473 on Alaska Airlines. The table lists each departure by date with its times and aircraft. **How do I check upgrade or award availability on STL to SEA?** Open the STL to SEA route on the interactive map or the matrix to see confirmed upgrade and award space by date on Alaska Airlines, 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 [SEA to STL upgrade and award space](https://2lnr.com/routes/sea-stl.md). Award seats rather than schedules? See [Alaska Airlines award availability](https://2lnr.com/awards/as.md). Looking beyond this route? See [every route from St. Louis (STL)](https://2lnr.com/routes/stl.md), or [every route from Seattle (SEA)](https://2lnr.com/routes/sea.md). Nonstops from St. Louis (STL) to other airports within 150 miles of Seattle (SEA): - [St. Louis (STL) to Portland (PDX)](https://2lnr.com/routes/stl-pdx.md), 129 miles from SEA 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 STL to SEA 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)