Seattle to St. Louis (SEA-STL): nonstop upgrade & award space

Alaska Airlines flies nonstop between Seattle (SEA) and St. Louis (STL), roughly 18 times a week. With Alaska Airlines running most of the schedule, the shape of a week is predictable, which makes an open premium seat on a given date easy to spot and quick to lose. 2LNR tracks confirmed upgrade and award space on Alaska Airlines, on every SEA to STL departure, so you know which flights have space before you book.

Schedule last confirmed . Departure times come from 2LNR's schedule data; confirm with the airline before you book.

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18
Nonstop flights a week
1,705 mi
Nonstop distance
Free
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Seattle to St. Louis flight schedule

Scheduled nonstop departures for SEA to STL, last checked against our schedule feed on September 6, 2026. Airlines retime and cancel flights, so confirm with the airline before you book.

Schedule data dated .

Scheduled nonstop departures from Seattle (SEA) to St. Louis (STL)
Date Flight Airline Departs SEA Arrives STL Duration Aircraft
AS 388Alaska Airlines, Inc.08:1314:214h 8m73J
AS 672Alaska Airlines, Inc.12:3518:384h 3m7M9
AS 388Alaska Airlines, Inc.08:1314:214h 8m7M9
AS 672Alaska Airlines, Inc.12:3518:384h 3m7M9
AS 472Alaska Airlines, Inc.18:0323:593h 56m7M9
AS 388Alaska Airlines, Inc.08:1314:214h 8m7M9
AS 672Alaska Airlines, Inc.12:3518:384h 3m7M9
AS 472Alaska Airlines, Inc.18:0323:593h 56m7M9
AS 388Alaska Airlines, Inc.08:1314:214h 8m73H
AS 672Alaska Airlines, Inc.12:3518:384h 3m7M9
AS 388Alaska Airlines, Inc.08:1314:214h 8m73J
AS 672Alaska Airlines, Inc.12:3518:384h 3m73J
AS 472Alaska Airlines, Inc.18:0323:593h 56m7M9
AS 388Alaska Airlines, Inc.08:1314:214h 8m7M9
AS 672Alaska Airlines, Inc.12:3518:384h 3m73J
AS 472Alaska Airlines, Inc.18:0323:593h 56m737
AS 388Alaska Airlines, Inc.08:1314:214h 8m737
AS 672Alaska Airlines, Inc.12:3518:384h 3m73J

Showing all 18 scheduled SEA to STL departures across the next 7 days with service. 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 has not filed that value in the schedule data we hold. Aircraft are IATA equipment codes as filed, and can change up to departure.

See every SEA to STL date on the interactive map

Confirmed upgrade & award space on SEA to STL departures

2LNR tracks confirmed upgrade and award space on Alaska Airlines, segment by segment and date by date. Open the calendar for Seattle to St. Louis to see which departures have space, the next 14 days free on every product and the full horizon on Pro.

See real availability

Confirmed upgrade and award seats on each SEA to STL departure, checked against live inventory so you know what is open before you book.

Set an alert

Premium inventory turns over fast. Watch this route and 2LNR notifies you when space appears on a date you are tracking.

Plan on the map

See SEA to STL on the interactive route map, with schedules, connections, and route statistics.

Airlines flying Seattle to St. Louis nonstop

Carriers operating SEA to STL nonstop in the current schedule. 2LNR tracks confirmed upgrade and award space on each of them.

See SEA to STL on the interactive map →

Frequently asked questions about SEA to STL

How far is St. Louis from Seattle?
SEA to STL covers about 1,705 miles nonstop. Flight times vary by aircraft and season; the schedule table on this page lists each scheduled departure with its own times.
Which airlines fly nonstop from SEA to STL?
Alaska Airlines is currently the only airline flying SEA to STL nonstop. 2LNR tracks confirmed upgrade and award space on Alaska Airlines.
How many flights a week are there from SEA to STL?
About 18 nonstop flights a week run between Seattle and St. Louis 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 SEA to STL depart?
Scheduled SEA to STL nonstops in the next 7 days with service leave between 08:13 and 18:03, local time at Seattle. The schedule table on this page lists every departure by date, with its arrival time and aircraft.
How do I check upgrade or award availability on SEA to STL?
Open the SEA to STL 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.

Never miss SEA to STL upgrade or award space

See what is open by date on this route, the next 14 days free on every product and the full horizon on Pro.

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