YUL → STLMontréal to St Louis

live

Direct flights from Montréal (YUL) to St Louis (STL): 7 nonstop departures observed each week across 1 airline. 83% of the last 6 operated flights arrived within 15 minutes of schedule. The median arrival is on schedule. No cancellations were recorded across the 6 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 23 October 2026 at 20:18 UTC.

YUL Montréal busy · +16
STL St Louis smooth · +0
1,557 km · ~2h 30m est.
departs 16:557x weekly
Runs reliable · 1 airline · 7x weekly · nonstop
83% on time

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

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

Median arrival+0 minacross the last 6 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 CanadaAC80% on time

Flights AC8687 16:55 daily

History

operated legs · board outcomes
10-23AC8687dep +56 → arr+20
10-23JL420departed+0
10-22AC8687dep +26 → arr−6
10-21AC8687dep +13 → arr−21
10-20AC8687dep +10 → arr−26
10-19AC8687dep +33 → arr+3

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
YULMontréal +16 min busy 🌤 scattered clouds · W 5 kt Full YUL delay board →
STLSt Louis +0 min smooth 🌤 mostly cloudy · N 0 kt Full STL delay board →

Weather lens

Current conditions put the pressure at YUL and STL: 43% 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 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
https://proflightsearch.com/search-flights/YUL-STL
How we measure this →

YUL to STL questions

Is YUL–STL running on time right now?

Smooth skies ahead. The departure side at YUL is the weaker end, route health score 89/100. 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.