Cheap Flights from Montreal to St Louis
No deal from Montreal to St Louis has cleared our price bar yet. What we have seen on the route is below.
Across 4 months of observations from Montreal to St Louis, the lowest round-trip fare we recorded was $391, in September. The typical fare was $457. September was the cheapest month we saw and July the dearest.
The most recent price we saw on this route was $493 on American, seen Oct 16. It is an unverified observation and may have changed.
See every deal <a href="/from/montreal">from Montreal</a>, <a href="/to/st-louis">to St Louis</a>, or the return direction <a href="/from/st-louis/to/montreal">St Louis to Montreal</a>.
Latest price we saw: Montreal to St Louis
The most recent round-trip fare our sweep found on this route. It is not verified and may have changed since the date shown.
| From | Price | Per mile | Travel dates | Airline | Seen | Check price |
|---|---|---|---|---|---|---|
| Montreal (YUL) to St Louis (STL) | $493 | 25.5¢ | Dec 3 – Dec 11 | American | Oct 16 | Check price |
Price history: Montreal to St Louis
What we observed by month, from our signals database. Unverified observations, not bookable prices.
| Month | Low | Typical | Sightings |
|---|---|---|---|
| Oct 2026 | $421 | $499 | 6 |
| Sep 2026 | $391 | $452 | 17 |
| Aug 2026 | $407 | $454 | 27 |
| Jul 2026 | $422 | $422 | 1 |
Frequently asked questions
How many flight deals from Montreal to St Louis are on Sparkflights right now?
There are 0 verified deals from Montreal to St Louis on the board right now. The list refreshes hourly.
What is the lowest price ever seen from Montreal to St Louis?
The lowest fare we've recorded from Montreal to St Louis is $391, based on 51 price observations over 4 months.
How much does a flight from Montreal to St Louis cost?
The typical round-trip fare we observed from Montreal to St Louis is $457, against a recorded low of $391. These are observations, not quotes.
When is the cheapest month to fly Montreal to St Louis?
September was the cheapest month we observed from Montreal to St Louis and July the dearest, over 4 months of data.
What is the current price from Montreal to St Louis?
The most recent fare our sweep saw from Montreal to St Louis is $493, on Oct 16. It is an unverified observation rather than a verified deal, so check it before booking.