STL → SEASt Louis to Seattle

live

Direct flights from St Louis (STL) to Seattle (SEA): 7 nonstop departures observed each week across 1 airline. 67% of the last 6 operated flights arrived within 15 minutes of schedule. The median arrival is 13 minutes late. No cancellations were recorded across the 6 tracked flights. The nonstop covers 2,744 km, an estimated 4 hours 1 minutes in the air. Measured by Pro Flight Search from live flight boards at St Louis and Seattle. Updated 24 October 2026 at 06:57 UTC.

STL St Louis smooth · +13
SEA Seattle smooth · +0
2,744 km · ~4h 01m est.
dep bank 07:02–16:427x weekly
Runs mixed · 1 airline · 7x weekly · nonstop
67% on time

of the last 6 operated STL → SEA flights arrived within 15 minutes

Median arrival delay is +13 min. 0 of 6 tracked legs cancelled in the sample. Will a delayed flight be cancelled? →

Median arrival+13 minacross the last 6 operated legs
Flight time~4h 01mestimated from route distance
Weekly departures7x1 direct airline on the leg

The week

scheduled departures · origin local time
06121824
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Alaska Airlines

Each mark is a scheduled departure at its origin-local time, observed operating in the last 7 days. Today is highlighted.

Who flies it

observed on the boards · 7 days
Alaska AirlinesAS67% on time

Flights AS473 07:02 daily · AS314 16:42 daily

History

operated legs · board outcomes
10-23AS314departed+35
10-23AS473departed+12
10-22AS314departed+13
10-22AS473departed+11
10-21AS314departed+20
10-21AS473departed+5

Actual board outcomes rather than schedules, paired departure and arrival per flight and day.

Full board history, day by day →

Airports right now

live boards
STLSt Louis +13 min smooth 🌤 mostly cloudy · ESE 5 kt Full STL delay board →
SEASeattle +0 min smooth 🌤 clear · SE 8 kt Full SEA delay board →

Weather lens

Current conditions put the pressure at STL: 40% odds of a 15+ minute delay and around +9 min expected when it bites, measured from this route's own weather-matched delay history. See live delays → · Weather risk by airport →

How the St Louis to Seattle route actually runs

Pro Flight Search records official board updates for nonstop STL to SEA flights through the day: schedules, estimates, gate pushes and actual departures. The verdict above comes from operated flights, so it reflects what this route does rather than what the timetable promises.

Planning around a delay? Live airport delays · Weather delay risk map · Will a delayed flight be cancelled? · Do planes make up time in the air? · How we measure

Cite this data

Journalists, bloggers, and researchers may cite this page with attribution and a link to Pro Flight Search.

Suggested citation

Pro Flight Search — St Louis (STL) to Seattle (SEA) route reliability, measured from operated flights on official airport boards.

Canonical URL
https://proflightsearch.com/search-flights/STL-SEA
How we measure this →

STL to SEA questions

Is STL–SEA running on time right now?

Smooth skies ahead. The departure side at STL is the weaker end, route health score 91/100. The airports section above carries the live status and delay window at both ends.

Morning or evening flight on STL–SEA?

Operators schedule morning departures around 07:02 from STL. Earlier flights typically land before destination-airport delays accumulate later in the day; check the SEA delay card to confirm conditions when you'd arrive.

How long is the flight from STL to SEA?

Great-circle distance is 2,744 km. With typical jet cruise speed plus taxi, climb and descent, expect roughly 224–265 min gate-to-gate on this route.

How often does STL–SEA fly?

Alaska Airlines runs the route with about 14 flights a week (daily). Since one carrier owns the route, a single disruption tends to ripple through the day.