Air CanadaAC57% on time
Flights AC8687 16:55 daily
live
Direct flights from Montréal (YUL) to St Louis (STL): 7 nonstop departures observed each week across 1 airline. 57% of the last 7 operated flights arrived within 15 minutes of schedule. The median arrival is 11 minutes late. No cancellations were recorded across the 7 tracked flights. 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 Montréal and St Louis. Updated 15 September 2026 at 20:18 UTC.
YUL
Montréal
smooth · +0
STL
St Louis
smooth · +0
1,557 km · ~2h 30m est.
Runs rough · 1 airline · 7x weekly · nonstop
57% on time
of the last 7 operated YUL → STL flights arrived within 15 minutes
Median arrival delay is +11 min. 0 of 7 tracked legs cancelled in the sample. Will a delayed flight be cancelled? →
Median arrival+11 minacross the last 7 operated legs
Flight time~2h 30mestimated from route distance
Weekly departures7x1 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 daysHistory
operated legs · board outcomesActual 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 YUL and STL: 45% odds of a 15+ minute delay and around +11 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 Montréal to St Louis route actually runs
Pro Flight Search records official board updates for nonstop YUL to STL 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 — Montréal (YUL) to St Louis (STL) route reliability, measured from operated flights on official airport boards.
Canonical URL
How we measure this →
https://proflightsearch.com/search-flights/YUL-STL
YUL to STL questions
Is YUL–STL running on time right now?
Smooth skies ahead. Both endpoints currently score the same, route health score 100/100. The airports section above carries the live status and delay window at both ends.
How long is the flight from YUL to STL?
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 YUL–STL fly?
Air Canada runs the route with about 7 flights a week (daily). 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 YUL and arrival-side delay at STL, 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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