American AirlinesAA
Flights AA3546 09:44 Mo Tu We Th Fr · AA4417 09:46 Su · AA4678 20:00 daily
live
Direct flights from St Louis (STL) to Boston (BOS): 14 nonstop departures observed each week across 2 airlines. 50% of the last 8 operated flights arrived within 15 minutes of schedule. The median arrival is 24 minutes late. No cancellations were recorded across the 8 tracked flights. The nonstop covers 1,681 km, an estimated 2 hours 39 minutes in the air. Measured by Pro Flight Search from live flight boards at St Louis and Boston. Updated 10 September 2026 at 15:27 UTC.
STL
St Louis
smooth · +12
BOS
Boston
smooth · +0
1,681 km · ~2h 39m est.
Runs rough · 2 airlines · 14x weekly · nonstop
50% on time
of the last 8 operated STL → BOS flights arrived within 15 minutes
Median arrival delay is +24 min. 0 of 8 tracked legs cancelled in the sample. Will a delayed flight be cancelled? →
Median arrival+24 minacross the last 8 operated legs
Flight time~2h 39mestimated from route distance
Weekly departures14x2 direct airlines on the leg
The week
scheduled departures · origin local time06121824
Mon
Tue
Wed
Thu
Fri
Sat
Sun
American AirlinesSouthwest 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 daysHistory
operated legs · board outcomes09-10MQ3546departed+12
09-09MQ3546departed+24
Actual board outcomes rather than schedules, paired departure and arrival per flight and day.
Full board history, day by day →
Airports right now
live boardsWeather lens
Current conditions put the pressure at STL and BOS: 46% odds of a 15+ minute delay and around +12 min expected when it bites, measured from this route's own weather-matched delay history. See live delays → · Weather risk by airport →
next sweep in 120s
How the St Louis to Boston route actually runs
Pro Flight Search records official board updates for nonstop STL to BOS 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 Boston (BOS) route reliability, measured from operated flights on official airport boards.
Canonical URL
How we measure this →
https://proflightsearch.com/search-flights/STL-BOS
STL to BOS questions
Is STL–BOS running on time right now?
Mostly on schedule. The departure side at STL is the weaker end, route health score 73/100. The airports section above carries the live status and delay window at both ends.
Morning or evening flight on STL–BOS?
Operators schedule morning departures around 07:00 and evening departures around 19:00 from STL. Earlier flights typically land before destination-airport delays accumulate later in the day; check the BOS delay card to confirm conditions when you'd arrive.
How long is the flight from STL to BOS?
Great-circle distance is 1,681 km. With typical jet cruise speed plus taxi, climb and descent, expect roughly 149–174 min gate-to-gate on this route.
How often does STL–BOS fly?
2 carriers operate this route, around 34 flights a week between them. Compare carrier days and times in the airline list above.
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