STL → YULSt Louis to Montréal

live

Direct flights from St Louis (STL) to Montréal (YUL): 7 nonstop departures observed each week across 1 airline. 75% of the last 8 operated flights arrived within 15 minutes of schedule. The median arrival is 18 minutes early. 1 of the 8 tracked flights was cancelled. 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 15 September 2026 at 02:34 UTC.

STL St Louis heavy · +41
YUL Montréal smooth · +0
1,557 km · ~2h 30m est.
departs 12:107x weekly
Runs mixed · 1 airline · 7x weekly · nonstop
75% on time

of the last 8 operated STL → YUL flights arrived within 15 minutes

Median arrival delay is −18 min. 1 of 8 tracked legs cancelled in the sample. Will a delayed flight be cancelled? →

Median arrival−18 minacross the last 8 operated legs
Flight time~2h 30mestimated 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
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 days
Air CanadaAC75% on time

Flights AC8688 12:10 daily

History

operated legs · board outcomes
09-14AC8688dep +5 → arr−15
09-13AC8688dep +7 → arr−18
09-12AC8688dep +13 → arr−19
09-11AC7196dep +49 → arr+21
09-11AC8688dep +13 → arr−18
09-10AC8688cancelledCNX
09-09AC8688dep +4 → arr−22
09-08AC8688dep +9 → arr−17

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 +41 min heavy 🌤 clear · SSE 11 kt Full STL delay board →
YULMontréal +0 min smooth 🌤 clear · NE 7 kt Full YUL delay board →

Weather lens

Current conditions put the pressure at STL and YUL: 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 →

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
https://proflightsearch.com/search-flights/STL-YUL
How we measure this →

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 73/100. 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 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 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.