Air CanadaAC
Flights AC8688 12:10 Mo Tu We Th Fr Sa
live
Direct flights from St Louis (STL) to Montréal (YUL): 6 nonstop departures observed each week across 1 airline. The nonstop covers 1,557 km, an estimated 2 hours 30 minutes in the air. Measured by Pro Flight Search from live flight boards at St Louis and Montréal. Updated 2 November 2026 at 20:00 UTC.
STL
St Louis
smooth · +7
YUL
Montréal
smooth · +0
1,557 km · ~2h 30m est.
Running clean · 1 airline · 6x weekly · nonstop
74 / 100
route health from live STL and YUL delay boards
Flight time~2h 30mestimated from route distance
Weekly departures6x1 direct airline on the leg
The week
scheduled departures · origin local time06121824
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Air Canada
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 daysAirports right now
live boardsWeather lens
Conditions are tightest at STL: a 42% chance of a 15+ minute delay. In this weather, the more delayed of the two airports is typically about +11 min. Both figures come from the two airports' delay records in similar weather. See live delays → · Weather risk by airport →
next sweep in 120s
How the St Louis to Montréal route actually runs
Pro Flight Search records official board updates for nonstop STL to YUL 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 Montréal (YUL) route reliability, measured from operated flights on official airport boards.
Canonical URL
How we measure this →
https://proflightsearch.com/search-flights/STL-YUL
STL to YUL questions
Is STL–YUL running on time right now?
Mostly on schedule. The departure side at STL is the weaker end, route health score 74/100. The airports section above carries the live status and delay window at both ends.
How long is the flight from STL to YUL?
Great-circle distance is 1,557 km. With typical jet cruise speed plus taxi, climb and descent, expect roughly 140–163 min gate-to-gate on this route.
How often does STL–YUL fly?
Air Canada runs the route with about 6 flights a week (mon, tue, wed, thu, fri, sat). Since one carrier owns the route, a single disruption tends to ripple through the day.
What does the route health score measure?
A blend of departure-side delay at STL and arrival-side delay at YUL, computed from rolling delay windows (refreshed every 40 minutes) with a daily-rollup fallback. Current MVFR, IFR, or LIFR endpoint weather caps the score when flight rules can limit throughput. Higher is healthier: 100 means operations are clean at both ends.
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