What are the cheapest airlines to fly from Montreal to St. Louis one-way?

To fly one-way, consider booking your trip with Air Canada, which is currently one of the cheapest options available, starting at C$ 333. American Airlines flights start at C$ 377 while deals on Delta start at C$ 412 one-way.

What are the most popular airlines that fly from Montreal to St. Louis?

Consider Endeavor Airlines, American Airlines or Air Canada when booking your flight. These represent the most popular airlines when flying from Montreal to St. Louis.

Can I find flights from Montreal to St. Louis for under C$ 600 on Cheapflights?

Yes, there are multiple flights from Montreal to St. Louis for under C$ 600. The cheapest flight booked recently is on Delta for just C$ 594, but on average you can expect to pay C$ 649.

Are there last-minute flights available from Montreal to St. Louis for under C$ 800?

There are currently 4+ open flights from Montreal to St. Louis within the next 7 days for less than C$ 800.

Which airlines flying from Montreal to Lambert-St Louis have flexible cancellations due to COVID-19?

Due to the rapidly changing circumstances due to COVID-19, airlines like Air Canada, American Airlines, and Delta flying from Montreal to Lambert-St Louis have implemented new flexible cancellation policies.

What is the cheapest day to fly round-trip from Montreal to St. Louis?

Users have found that flying from Montreal to St. Louis on a Sunday typically leans towards higher prices. However, this doesn’t mean you still can’t find a deal. Flexibility with other aspects of your flight can still land a great price for your trip.

What is the cheapest month to fly from Montreal to St. Louis?

Flights from Montreal to St. Louis lean towards being more expensive in July. Prices are generally better when you fly from Montreal to St. Louis in January, with the cheapest ticket starting at C$ 511.

When is the cheapest time to fly from Montreal to St. Louis (YMQ - STL)?

Unlike at noon, when flights are generally more expensive, you can save up to 22% on flights from Montreal to St. Louis by exploring options for tickets in the morning.

What airport do you fly into for flights to St. Louis from Montreal?

Most people fly into Lambert-St Louis (STL) if they book a flight to St. Louis from Montreal. On average, Lambert-St Louis has 0 inbound flights from Montreal per day from 4 airlines. Lambert-St Louis is conveniently located just 20.4 km from St. Louis’s city centre.

What does YUL to STL mean?

This is defined as Montreal Pierre Elliott Trudeau Intl Airport (YUL) and Lambert-St Louis Airport (STL). Codes like Lambert-St Louis Airport are often used to just call airports uniquely.

Cheap Flights from Montreal to St. Louis from C$ 333

YMQ — STL

26 Mar — 2 Apr1

Return

1 adult

Economy

Sun 26/3

Sun 2/4

The best prices from Montreal to Lambert-St Louis are usually found in January or May, booked 46 days in advance, depart on a Saturday or Thursday and return on a Monday

How to find the cheapest flight from Montreal (YMQ) to St. Louis (STL)

YMQ - STL Price	C$ 438 - C$ 594
STL Temperature	0 - 27 °C
STL Rainfall	56 - 119 mm

YMQ - STL

Price

C$ 438 - C$ 594

STL

Temperature

0 - 27 °C

STL

Rainfall

56 - 119 mm

Popular in	July	High demand for flights, 16% potential price rise
Cheapest in	January	Best time to find cheap flights, 12% potential price drop
Round-trip from	C$ 600	From Montreal (YMQ) to Lambert-St Louis
One-way from	C$ 333	One-way flight from Montreal (YMQ) to Lambert-St Louis

When searching for a good deal, it’s best to be prepared for potential fluctuations in price. We recommend booking at least 46 days in advance, which can save you up to 32% on flights from Montreal to St. Louis compared to booking the week you need them. Waiting 46 days out may not be for everyone, so we have options available for flights within the next two weeks, with the lowest price starting at C$ 839. For sooner than that we have options available in the next 3 days from C$ 905.

Cheap flights from Montreal to St. Louis in March, April 2023

3 Apr. - 4 Apr.

YUL

Montreal Pierre Elliott Trudeau Intl

STL

Lambert-St Louis

1 stop

7h 53m

STL

Lambert-St Louis

YUL

Montreal Pierre Elliott Trudeau Intl

1 stop

5h 47m

C$ 594

Delta

Pick Dates

Deal found 20/3

3 Apr. - 4 Apr.

YUL

Montreal Pierre Elliott Trudeau Intl

STL

Lambert-St Louis

1 stop

6h 05m

STL

Lambert-St Louis

YUL

Montreal Pierre Elliott Trudeau Intl

2 stops

9h 58m

C$ 615

American Airlines

Pick Dates

Deal found 20/3

29 Mar. - 3 Apr.

YUL

Montreal Pierre Elliott Trudeau Intl

STL

Lambert-St Louis

2 stops

9h 19m

STL

Lambert-St Louis

YUL

Montreal Pierre Elliott Trudeau Intl

1 stop

7h 07m

C$ 702

American Airlines

Pick Dates

Deal found 20/3

29 Mar. - 3 Apr.

YUL

Montreal Pierre Elliott Trudeau Intl

STL

Lambert-St Louis

3 stops

31h 08m

STL

Lambert-St Louis

YUL

Montreal Pierre Elliott Trudeau Intl

1 stop

8h 15m

C$ 857

Multiple Airlines

Pick Dates

Deal found 20/3

29 Mar. - 3 Apr.

YUL

Montreal Pierre Elliott Trudeau Intl

STL

Lambert-St Louis

3 stops

31h 08m

STL

Lambert-St Louis

YUL

Montreal Pierre Elliott Trudeau Intl

3 stops

17h 49m

C$ 891

Multiple Airlines

Pick Dates

Deal found 20/3

29 Mar. - 3 Apr.

YUL

Montreal Pierre Elliott Trudeau Intl

STL

Lambert-St Louis

2 stops

24h 33m

STL

Lambert-St Louis

YUL

Montreal Pierre Elliott Trudeau Intl

3 stops

17h 49m

C$ 953

Multiple Airlines

Pick Dates

Deal found 20/3

Montreal to St. Louis 2023 flight deals

3 Apr. - 4 Apr.

YUL

Montreal Pierre Elliott Trudeau Intl

STL

Lambert-St Louis

1 stop

7h 53m

STL

Lambert-St Louis

YUL

Montreal Pierre Elliott Trudeau Intl

1 stop

5h 47m

C$ 594

Delta

Pick Dates

Deal found 20/3

16 May - 18 May

YUL

Montreal Pierre Elliott Trudeau Intl

STL

Lambert-St Louis

1 stop

4h 49m

STL

Lambert-St Louis

YUL

Montreal Pierre Elliott Trudeau Intl

1 stop

4h 52m

C$ 602

Air Canada

Pick Dates

Deal found 20/3

16 May - 18 May

YUL

Montreal Pierre Elliott Trudeau Intl

STL

Lambert-St Louis

1 stop

6h 39m

STL

Lambert-St Louis

YUL

Montreal Pierre Elliott Trudeau Intl

1 stop

4h 52m

C$ 604

Air Canada

Pick Dates

Deal found 21/3

3 Apr. - 4 Apr.

YUL

Montreal Pierre Elliott Trudeau Intl

STL

Lambert-St Louis

1 stop

6h 05m

STL

Lambert-St Louis

YUL

Montreal Pierre Elliott Trudeau Intl

2 stops

9h 58m

C$ 615

American Airlines

Pick Dates

Deal found 20/3

15 Jul. - 20 Jul.

YUL

Montreal Pierre Elliott Trudeau Intl

STL

Lambert-St Louis

1 stop

5h 20m

STL

Lambert-St Louis

YUL

Montreal Pierre Elliott Trudeau Intl

1 stop

12h 41m

C$ 633

Air Canada

Pick Dates

Deal found 20/3

21 Jun. - 26 Jun.

YUL

Montreal Pierre Elliott Trudeau Intl

STL

Lambert-St Louis

1 stop

5h 20m

STL

Lambert-St Louis

YUL

Montreal Pierre Elliott Trudeau Intl

1 stop

12h 41m

C$ 634

Air Canada

Pick Dates

Deal found 20/3

16 May - 18 May

YUL

Montreal Pierre Elliott Trudeau Intl

STL

Lambert-St Louis

1 stop

16h 32m

STL

Lambert-St Louis

YUL

Montreal Pierre Elliott Trudeau Intl

2 stops

9h 30m

C$ 638

American Airlines

Pick Dates

Deal found 20/3

18 May - 19 May

YUL

Montreal Pierre Elliott Trudeau Intl

STL

Lambert-St Louis

1 stop

8h 53m

STL

Lambert-St Louis

YUL

Montreal Pierre Elliott Trudeau Intl

1 stop

14h 27m

C$ 645

American Airlines

Pick Dates

Deal found 20/3

18 May - 19 May

YUL

Montreal Pierre Elliott Trudeau Intl

STL

Lambert-St Louis

1 stop

11h 27m

STL

Lambert-St Louis

YUL

Montreal Pierre Elliott Trudeau Intl

1 stop

8h 12m

C$ 646

American Airlines

Pick Dates

Deal found 21/3

Cheap Air Canada flights from Montreal to St. Louis

16 May - 18 May

YUL

Montreal Pierre Elliott Trudeau Intl

STL

Lambert-St Louis

1 stop

4h 49m

STL

Lambert-St Louis

YUL

Montreal Pierre Elliott Trudeau Intl

1 stop

4h 52m

C$ 602

Air Canada

Pick Dates

Deal found 20/3

16 May - 18 May

YUL

Montreal Pierre Elliott Trudeau Intl

STL

Lambert-St Louis

1 stop

6h 39m

STL

Lambert-St Louis

YUL

Montreal Pierre Elliott Trudeau Intl

1 stop

4h 52m

C$ 604

Air Canada

Pick Dates

Deal found 21/3

15 Jul. - 20 Jul.

YUL

Montreal Pierre Elliott Trudeau Intl

STL

Lambert-St Louis

1 stop

5h 20m

STL

Lambert-St Louis

YUL

Montreal Pierre Elliott Trudeau Intl

1 stop

12h 41m

C$ 633

Air Canada

Pick Dates

Deal found 20/3

21 Jun. - 26 Jun.

YUL

Montreal Pierre Elliott Trudeau Intl

STL

Lambert-St Louis

1 stop

5h 20m

STL

Lambert-St Louis

YUL

Montreal Pierre Elliott Trudeau Intl

1 stop

12h 41m

C$ 634

Air Canada

Pick Dates

Deal found 20/3

Cheap American Airlines flights from Montreal to St. Louis

3 Apr. - 4 Apr.

YUL

Montreal Pierre Elliott Trudeau Intl

STL

Lambert-St Louis

1 stop

6h 05m

STL

Lambert-St Louis

YUL

Montreal Pierre Elliott Trudeau Intl

2 stops

9h 58m

C$ 615

American Airlines

Pick Dates

Deal found 20/3

16 May - 18 May

YUL

Montreal Pierre Elliott Trudeau Intl

STL

Lambert-St Louis

1 stop

16h 32m

STL

Lambert-St Louis

YUL

Montreal Pierre Elliott Trudeau Intl

2 stops

9h 30m

C$ 638

American Airlines

Pick Dates

Deal found 20/3

18 May - 19 May

YUL

Montreal Pierre Elliott Trudeau Intl

STL

Lambert-St Louis

1 stop

8h 53m

STL

Lambert-St Louis

YUL

Montreal Pierre Elliott Trudeau Intl

1 stop

14h 27m

C$ 645

American Airlines

Pick Dates

Deal found 20/3

18 May - 19 May

YUL

Montreal Pierre Elliott Trudeau Intl

STL

Lambert-St Louis

1 stop

11h 27m

STL

Lambert-St Louis

YUL

Montreal Pierre Elliott Trudeau Intl

1 stop

8h 12m

C$ 646

American Airlines

Pick Dates

Deal found 21/3

29 Mar. - 3 Apr.

YUL

Montreal Pierre Elliott Trudeau Intl

STL

Lambert-St Louis

2 stops

9h 19m

STL

Lambert-St Louis

YUL

Montreal Pierre Elliott Trudeau Intl

1 stop

7h 07m

C$ 702

American Airlines

Pick Dates

Deal found 20/3

22 Jun. - 25 Jun.

YUL

Montreal Pierre Elliott Trudeau Intl

STL

Lambert-St Louis

2 stops

8h 41m

STL

Lambert-St Louis

YUL

Montreal Pierre Elliott Trudeau Intl

1 stop

7h 03m

C$ 753

American Airlines

Pick Dates

Deal found 20/3

Last minute flights from Montreal to St. Louis

29 Mar. - 3 Apr.

YUL

Montreal Pierre Elliott Trudeau Intl

STL

Lambert-St Louis

2 stops

9h 19m

STL

Lambert-St Louis

YUL

Montreal Pierre Elliott Trudeau Intl

1 stop

7h 07m

C$ 702

American Airlines

Pick Dates

Deal found 20/3

29 Mar. - 3 Apr.

YUL

Montreal Pierre Elliott Trudeau Intl

STL

Lambert-St Louis

3 stops

31h 08m

STL

Lambert-St Louis

YUL

Montreal Pierre Elliott Trudeau Intl

1 stop

8h 15m

C$ 857

Multiple Airlines

Pick Dates

Deal found 20/3

29 Mar. - 3 Apr.

YUL

Montreal Pierre Elliott Trudeau Intl

STL

Lambert-St Louis

3 stops

31h 08m

STL

Lambert-St Louis

YUL

Montreal Pierre Elliott Trudeau Intl

3 stops

17h 49m

C$ 891

Multiple Airlines

Pick Dates

Deal found 20/3

29 Mar. - 3 Apr.

YUL

Montreal Pierre Elliott Trudeau Intl

STL

Lambert-St Louis

2 stops

24h 33m

STL

Lambert-St Louis

YUL

Montreal Pierre Elliott Trudeau Intl

3 stops

17h 49m

C$ 953

Multiple Airlines

Pick Dates

Deal found 20/3

One-way flights to St. Louis from Montreal

13 May

YUL

Montreal Pierre Elliott Trudeau Intl

STL

Lambert-St Louis

1 stop

6h 39m

C$ 333

Air Canada

Pick Dates

Deal found 20/3

13 May

YUL

Montreal Pierre Elliott Trudeau Intl

STL

Lambert-St Louis

2 stops

8h 54m

C$ 377

American Airlines

Pick Dates

Deal found 20/3

7 Apr.

YUL

Montreal Pierre Elliott Trudeau Intl

STL

Lambert-St Louis

1 stop

8h 03m

C$ 412

Delta

Pick Dates

Deal found 20/3

7 Apr.

YUL

Montreal Pierre Elliott Trudeau Intl

STL

Lambert-St Louis

2 stops

9h 00m

C$ 590

United Airlines

Pick Dates

Deal found 20/3

7 Apr.

YUL

Montreal Pierre Elliott Trudeau Intl

STL

Lambert-St Louis

3 stops

36h 13m

C$ 897

Multiple Airlines

Pick Dates

Deal found 20/3

Find flights from Montreal to St. Louis within your budget

Fly from

Fly to

Budget

C$ 594 - C$ 775

Route

Depart

Return

Price

Montreal Pierre Elliott Trudeau IntlLambert-St Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

2023-04-03

1 stop7h 53m

Lambert-St Louis

2023-04-04

1 stop5h 47m

C$ 594

Pick Dates

Montreal Pierre Elliott Trudeau IntlLambert-St Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

2023-05-16

1 stop4h 49m

Lambert-St Louis

2023-05-18

1 stop4h 52m

C$ 602

Pick Dates

Montreal Pierre Elliott Trudeau IntlLambert-St Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

2023-05-16

1 stop6h 39m

Lambert-St Louis

2023-05-18

1 stop4h 52m

C$ 604

Pick Dates

Montreal Pierre Elliott Trudeau IntlLambert-St Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

2023-04-03

1 stop6h 05m

Lambert-St Louis

2023-04-04

2 stops9h 58m

C$ 615

Pick Dates

Montreal Pierre Elliott Trudeau IntlLambert-St Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

2023-07-15

1 stop5h 20m

Lambert-St Louis

2023-07-20

1 stop12h 41m

C$ 633

Pick Dates

Montreal Pierre Elliott Trudeau IntlLambert-St Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

2023-06-21

1 stop5h 20m

Lambert-St Louis

2023-06-26

1 stop12h 41m

C$ 634

Pick Dates

Montreal Pierre Elliott Trudeau IntlLambert-St Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

2023-05-16

1 stop16h 32m

Lambert-St Louis

2023-05-18

2 stops9h 30m

C$ 638

Pick Dates

Montreal Pierre Elliott Trudeau IntlLambert-St Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

2023-05-18

1 stop8h 53m

Lambert-St Louis

2023-05-19

1 stop14h 27m

C$ 645

Pick Dates

Montreal Pierre Elliott Trudeau IntlLambert-St Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

2023-07-15

2 stops11h 52m

Lambert-St Louis

2023-07-20

2 stops10h 28m

C$ 775

Pick Dates

Flights are sorted by cheapest first

Deals found on 20/3

Related info for your journey

Currently priced at C$ 594, Delta will fly you from Montreal to St. Louis and back. In addition to Delta, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Air Canada and American Airlines - these airlines can fly you to your destination from C$ 602 and C$ 615, respectively. You may be able to fly from Montreal to St. Louis for 12% less than the average price by searching for these airlines.

Alternative routes for Montreal to St. Louis

Québec City to Kansas Cityfrom C$ 642 pp

Québec City to St. Louisfrom C$ 701 pp

Top 4 airlines flying from Montreal to St. Louis

Airline	Cheapest	Average	Flexibility	On-time	COVID-19 safety
American Airlines	CheapestC$ 509	AverageC$ 664	FlexibilityNo cancel fee	On-time71%	COVID-19 safety	Search American Airlines flights
Delta	CheapestC$ 553	AverageC$ 667	FlexibilityNo cancel fee	On-timeN/A	COVID-19 safety	Search Delta flights
Endeavor Airlines	CheapestC$ 571	AverageC$ 924	FlexibilityNo cancel fee	On-timeN/A	COVID-19 safety	Search Endeavor Airlines flights
Air Canada	CheapestC$ 577	AverageC$ 696	FlexibilityNo cancel fee	On-time67%	COVID-19 safety	Search Air Canada flights

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Cheap flights from Montreal to St. Louis from C$ 333

The best prices from Montreal to Lambert-St Louis are usually found in January or May, booked 46 days in advance, depart on a Saturday or Thursday and return on a Monday

How to find the cheapest flight from Montreal (YMQ) to St. Louis (STL)

All the information you need to plan the best YMQ to STL flight in 2023: compare Montreal to St. Louis flight prices with the expected peak season, weather and rainfall in St. Louis.

What is the cheapest day to fly round-trip from Montreal to St. Louis?

How far in advance should I book a flight from Montreal to St. Louis?

What is the cheapest month to fly from Montreal to St. Louis?

When is the cheapest time to fly from Montreal to St. Louis (YMQ - STL)?

Cheap flights from Montreal to St. Louis in March, April 2023

The best prices found for YMQ to STL flights for March, April

Montreal to St. Louis 2023 flight deals

Cheap flights to St. Louis from Montreal found for this year

Cheap Air Canada flights from Montreal to St. Louis

Cheap American Airlines flights from Montreal to St. Louis

Last minute flights from Montreal to St. Louis

Late deals on round-trip flights to St. Louis from Montreal, departing today and this week

One-way flights to St. Louis from Montreal

The cheapest one-way flights from Montreal to St. Louis

Find flights from Montreal to St. Louis within your budget

Use the slider to find flights from Montreal to St. Louis that fit your budget.

Related info for your journey

Useful info, stats and facts about Montreal to St. Louis flights.

What airport do you fly into for flights to St. Louis from Montreal?

Which airlines flying from Montreal to Lambert-St Louis have flexible cancellations due to COVID-19?

Can I find flights from Montreal to St. Louis for under C$ 600 on Cheapflights?

Are there last-minute flights available from Montreal to St. Louis for under C$ 800?

What are the cheapest airlines flying from Montreal to St. Louis round-trip?

What are the cheapest airlines to fly from Montreal to St. Louis one-way?

What are the most popular airlines that fly from Montreal to St. Louis?

What does YUL to STL mean?

Other flights from Montreal

Other flights to St. Louis

Flights to St. Louis from Montreal

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Alternative routes for Montreal to St. Louis

See prices for flight routes from nearby airports that may be better suited for you.

Top 4 airlines flying from Montreal to St. Louis

The chart below displays the airlines Cheapflights users travelling from Montreal to St. Louis choose most often. Cheapest and average prices are based on aggregated data from the past 12 months.

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