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Cheap Flights from Montreal (YMQA) to St Louis (STL)

Compare Montreal to St Louis flight deals

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Flight deals from Montreal to St Louis Airport

Looking for a cheap last-minute deal or the best return flight from Montreal to St Louis Airport? If you want to travel next month, return fares start from £307. Find the lowest prices on one-way and return tickets right here.
St Louis.£293 per passenger.Departing Mon, 4 May, returning Mon, 11 May.Return flight with Porter Airlines and Frontier Airlines.Outbound indirect flight with Porter Airlines, departs from Montreal Pierre Elliott Trudeau on Mon, 4 May, arriving in St Louis.Inbound indirect flight with Frontier Airlines, departs from St Louis on Mon, 11 May, arriving in Montreal Pierre Elliott Trudeau.Price includes taxes and charges.From £293, select.
St Louis.£302 per passenger.Departing Mon, 27 Apr, returning Mon, 4 May.Return flight with Porter Airlines and Frontier Airlines.Outbound indirect flight with Porter Airlines, departs from Montreal Pierre Elliott Trudeau on Mon, 27 Apr, arriving in St Louis.Inbound indirect flight with Frontier Airlines, departs from St Louis on Mon, 4 May, arriving in Montreal Pierre Elliott Trudeau.Price includes taxes and charges.From £302, select.
St Louis.£307 per passenger.Departing Mon, 13 Apr, returning Mon, 20 Apr.Return flight with Porter Airlines and Frontier Airlines.Outbound indirect flight with Porter Airlines, departs from Montreal Pierre Elliott Trudeau on Mon, 13 Apr, arriving in St Louis.Inbound indirect flight with Frontier Airlines, departs from St Louis on Mon, 20 Apr, arriving in Montreal Pierre Elliott Trudeau.Price includes taxes and charges.From £307, select.
St Louis.£370 per passenger.Departing Thu, 21 May, returning Tue, 26 May.Return flight with Air Canada.Outbound direct flight with Air Canada departs from Montreal Pierre Elliott Trudeau on Thu, 21 May, arriving in St Louis.Inbound direct flight with Air Canada departs from St Louis on Tue, 26 May, arriving in Montreal Pierre Elliott Trudeau.Price includes taxes and charges.From £370, select.
St Louis.£375 per passenger.Departing Tue, 2 Jun, returning Tue, 9 Jun.Return flight with Porter Airlines and Southern Airways Express.Outbound indirect flight with Porter Airlines, departs from Montreal Pierre Elliott Trudeau on Tue, 2 Jun, arriving in St Louis.Inbound indirect flight with Southern Airways Express, departs from St Louis on Tue, 9 Jun, arriving in Montreal Pierre Elliott Trudeau.Price includes taxes and charges.From £375, select.
St Louis.£382 per passenger.Departing Fri, 29 May, returning Fri, 5 Jun.Return flight with Porter Airlines and Southern Airways Express.Outbound indirect flight with Porter Airlines, departs from Montreal Pierre Elliott Trudeau on Fri, 29 May, arriving in St Louis.Inbound indirect flight with Southern Airways Express, departs from St Louis on Fri, 5 Jun, arriving in Montreal Pierre Elliott Trudeau.Price includes taxes and charges.From £382, select.
St Louis.£395 per passenger.Departing Tue, 23 Jun, returning Tue, 30 Jun.Return flight with Air Canada.Outbound direct flight with Air Canada departs from Montreal Pierre Elliott Trudeau on Tue, 23 Jun, arriving in St Louis.Inbound direct flight with Air Canada departs from St Louis on Tue, 30 Jun, arriving in Montreal Pierre Elliott Trudeau.Price includes taxes and charges.From £395, select.
St Louis.£395 per passenger.Departing Wed, 7 Oct, returning Wed, 14 Oct.Return flight with Air Canada.Outbound direct flight with Air Canada departs from Montreal Pierre Elliott Trudeau on Wed, 7 Oct, arriving in St Louis.Inbound direct flight with Air Canada departs from St Louis on Wed, 14 Oct, arriving in Montreal Pierre Elliott Trudeau.Price includes taxes and charges.From £395, select.
St Louis.£395 per passenger.Departing Wed, 16 Sep, returning Wed, 23 Sep.Return flight with Air Canada.Outbound direct flight with Air Canada departs from Montreal Pierre Elliott Trudeau on Wed, 16 Sep, arriving in St Louis.Inbound direct flight with Air Canada departs from St Louis on Wed, 23 Sep, arriving in Montreal Pierre Elliott Trudeau.Price includes taxes and charges.From £395, select.
St Louis.£395 per passenger.Departing Wed, 29 Jul, returning Wed, 5 Aug.Return flight with Air Canada.Outbound direct flight with Air Canada departs from Montreal Pierre Elliott Trudeau on Wed, 29 Jul, arriving in St Louis.Inbound direct flight with Air Canada departs from St Louis on Wed, 5 Aug, arriving in Montreal Pierre Elliott Trudeau.Price includes taxes and charges.From £395, select.
St Louis.£395 per passenger.Departing Mon, 10 Aug, returning Mon, 17 Aug.Return flight with Air Canada.Outbound direct flight with Air Canada departs from Montreal Pierre Elliott Trudeau on Mon, 10 Aug, arriving in St Louis.Inbound direct flight with Air Canada departs from St Louis on Mon, 17 Aug, arriving in Montreal Pierre Elliott Trudeau.Price includes taxes and charges.From £395, select.
St Louis.£399 per passenger.Departing Tue, 24 Nov, returning Tue, 1 Dec.Return flight with United.Outbound indirect flight with United, departs from Montreal Pierre Elliott Trudeau on Tue, 24 Nov, arriving in St Louis.Inbound indirect flight with United, departs from St Louis on Tue, 1 Dec, arriving in Montreal Pierre Elliott Trudeau.Price includes taxes and charges.From £399, select.
St Louis.£399 per passenger.Departing Tue, 25 Aug, returning Tue, 1 Sep.Return flight with United.Outbound indirect flight with United, departs from Montreal Pierre Elliott Trudeau on Tue, 25 Aug, arriving in St Louis.Inbound indirect flight with United, departs from St Louis on Tue, 1 Sep, arriving in Montreal Pierre Elliott Trudeau.Price includes taxes and charges.From £399, select.
St Louis.£399 per passenger.Departing Tue, 27 Oct, returning Tue, 3 Nov.Return flight with United.Outbound indirect flight with United, departs from Montreal Pierre Elliott Trudeau on Tue, 27 Oct, arriving in St Louis.Inbound indirect flight with United, departs from St Louis on Tue, 3 Nov, arriving in Montreal Pierre Elliott Trudeau.Price includes taxes and charges.From £399, select.
St Louis.£399 per passenger.Departing Tue, 8 Dec, returning Tue, 15 Dec.Return flight with United.Outbound indirect flight with United, departs from Montreal Pierre Elliott Trudeau on Tue, 8 Dec, arriving in St Louis.Inbound indirect flight with United, departs from St Louis on Tue, 15 Dec, arriving in Montreal Pierre Elliott Trudeau.Price includes taxes and charges.From £399, select.
St Louis.£399 per passenger.Departing Wed, 24 Jun, returning Wed, 1 Jul.Return flight with United.Outbound indirect flight with United, departs from Montreal Pierre Elliott Trudeau on Wed, 24 Jun, arriving in St Louis.Inbound indirect flight with United, departs from St Louis on Wed, 1 Jul, arriving in Montreal Pierre Elliott Trudeau.Price includes taxes and charges.From £399, select.

Find the cheapest month to fly from Montreal to St Louis

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Montreal to St Louis flights are currently cheapest in May.
Mar
from £451
Apr
from £307
May
from £293
Jun
from £375
Jul
from £399
Aug
from £395
Sep
from £395
Oct
from £395
Nov
from £399
Dec
from £399
Jan
from £399
Feb
Find prices

Direct flights from Montreal to St Louis

Montreal to St Louis: Alternative routes

Compare routes from Montreal to St Louis below. You may find an airport to fly into that's cheaper, faster, or easier than St Louis.

St Louis

12 miles from central St Louis
ClosestCheapest
from £293
Search flights

Belleville

20 miles from central St Louis
from £416
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Sparta Community

43 miles from central St Louis
Search flights

Montreal to St Louis: Flight information

The things to know before you go.
Cheapest flight found£293
Cheapest month to flyMay
Average flight time2 hrs, 48 mins
Most popular airlineAir Canada
Average flights per week21

Check out these St Louis hotels

Ready to plan your stay? Other travellers rate these St Louis hotels for cleanliness, service and location.
Benton Park Inn
2.30 miles from city centre
£129
Per night
Holiday Inn Express & Suites - St. Louis South - I-55 by IHG
12.85 miles from city centre
£146
Per night
Drury Inn & Suites St. Louis St. Peters
25.57 miles from city centre
£102
Per night
Benton Park Inn
2.30 miles from city centre
£129
Per night
Holiday Inn Express & Suites - St. Louis South - I-55 by IHG
12.85 miles from city centre
£146
Per night
Drury Inn & Suites St. Louis St. Peters
25.57 miles from city centre
£102
Per night
Explore top-rated hotels

Finding cheap flights from Montreal to St Louis: Frequently asked questions

The best price we found for a return flight from Montreal to St Louis is £293. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.
2 hours and 48 minutes is the average flight time from Montreal to St Louis.
Air Canada, United and Jazz Air fly direct from Montreal to St Louis.
As of March 2026, there are 63 flights per week flying from Montreal to St Louis.
The cheapest month to fly from Montreal to St Louis is usually May.
After crunching the numbers on our flight calendar, we found that it is currently cheapest to fly from Montreal to St Louis Airport on Monday, 4 May 2026.
Yes – the average flight time is 2 hours and 48 minutes.
We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to St Louis but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.
We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to St Louis is around 40 days in advance, so don’t leave your flight to the last minute.

Travelling from Montreal to St Louis Lambert International Airport (STL): What you need to know

  • Montreal's main base, Montreal-Trudeau International Airport (YUL), is where countless incredible trips begin. Explore the departure options from here when planning your flight from Montreal to St Louis Lambert International Airport (STL).

  • Expect to be in the air for 2 hours 50 minutes. That's the average duration of a direct Montreal to St Louis Lambert International Airport flight.

  • The timezone in St Louis is UTC-6, which is one hour behind Montreal. St Louis Lambert International Airport is located in St Louis.

  • Take your pick of 3 direct services a week between Montreal-Trudeau International Airport (YUL) and St Louis Lambert International Airport (STL). This is the busiest route, with Air Canada offering a 6:10pm departure from YUL to STL.

  • Leave enough time to make your flight from Montreal to STL. A good rule of thumb is to arrive at least two hours before international departures and an hour ahead for domestic flights.

  • Flying during a popular month such as July? Major public holidays and other popular seasons can mean longer lines and delays at check-in and security. Play things extra safe and arrive up to four hours ahead of an international flight and two hours before domestic departures.

Airports in Montreal

Montreal-Trudeau International Airport (YUL)

  • Montreal-Trudeau International Airport (YUL) provides a hassle-free way to reach your destination. Nonstop flights from Montreal to St Louis Lambert International Airport (STL) operate out of this terminal.

  • Air Canada is a leading airline that operates direct flights from Montreal to St Louis Lambert International Airport leaving from YUL.

  • Air Canada sees the most traveller bookings for flights from YUL to STL.

  • Located around 19 kms (12 miles) from central Montreal, YUL can be reached in about 25 minutes by car, depending on traffic. The journey by public transport is roughly 45 minutes.

  • Catching an early flight from Montreal to St Louis Lambert International Airport? Avoid the last-minute rush to the terminal (and sneak in some bonus sleep) by picking one of these hotels near Montreal-Trudeau International Airport:

  • 67% of flights taking off from Montreal-Trudeau International Airport arrive at their destination on schedule.

  • You'll find YUL at 975 Romeo Vachon Street North.

Montreal Metropolitan Airport (YHU)

About St Louis Lambert International Airport (STL)

Getting from St Louis Lambert International Airport (STL) to central St Louis

  • Central St Louis is around 24 kms (15 miles) from St Louis Lambert International Airport and takes about 25 minutes to reach by car. See what your options are for heading into the city, whether that's with a car hire, taxi or ride-share.

  • If you're using public transport, expect a journey of about 30 minutes.

How to find the cheapest flights from Montreal to St Louis Lambert International Airport (STL)

  • £157 is the best price for a one-way ticket from Montreal to St Louis Lambert International Airport. Return flights start from £293. These fares can change depending on availability.

  • To find cheap flights from Montreal to STL, book ahead. Airlines typically offer the most competitive fares when tickets are first released.

  • Cheap Montreal to St Louis Lambert International Airport tickets are easier to find when your travel dates are flexible. Try using the 'Whole month' search tool to compare fares across every month and then choose the cheapest day.

  • Finding a cheap plane ticket from Montreal to STL couldn't be easier with Price Alerts. All you need to do is set up one of these automatic alerts and we'll notify you as soon as there's a price drop.

  • Tailor your travel plans using filters. Pick your ideal departure and arrival times, total journey duration and airlines. You can also sort your results by 'Fastest,' 'Best' or 'Cheapest' flights from Montreal to St Louis Lambert International Airport.

The best time to fly from Montreal to St Louis Lambert International Airport (STL)

  • December is the quietest month for flights from Montreal to St Louis Lambert International Airport (STL), while July is the most popular. Find the best time to go to St Louis based on whether you prefer a bustling atmosphere or a more laid-back vibe.

  • Lock in a Montreal to STL plane ticket departing in July if you want to explore the city during its warmest month. You can expect temperatures in St Louis to range from 17ºC to 33ºC.

  • January has temperatures of between -7ºC and 8ºC. Search for cheap tickets from Montreal to St Louis Lambert International Airport around that time if you like travelling in cooler conditions.

More about St Louis

Explore more of the United States

  • Evansville is just one of the many places in the United States waiting to be explored once you've taken in the sights of St Louis. Around 257 kms (160 miles) away to the east, its best attractions include Mesker Park Zoo, Riverfront Park and Evansville Museum of Arts, History & Science.

  • Columbia is another favourite destination in the United States and is around 177 kms (110 miles) west of St Louis. No journey is complete without visiting Museum of Art and Archaeology, Mizzou Botanic Garden and Francis Quadrangle.

Plan the rest of your trip from Montreal to St Louis

Prices shown on this page are estimated lowest prices only. Found in the last 45 days.