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Cheap flights from St. Louis to Montreal from $150

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Montreal departing on 12/15. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Cheap round-trip flights

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American Airlines Logo
6:44 pm - 3:08 pmSTL-YUL
19h 24m1 stop
American Airlines Logo
3:52 pm - 10:21 amYUL-STL
19h 29m1 stop
$376American Airlines
Find Deal
vie., ene. 16 - lun., ene. 19
Multiple Airlines Logo
2:47 pm - 4:23 pmSTL-YUL
24h 36m1 stop
Multiple Airlines Logo
4:35 pm - 8:59 amYUL-STL
17h 24m1 stop
$389Multiple Airlines
Find Deal
jue., dic. 11 - dom., dic. 14
United Airlines Logo
7:41 am - 10:20 amSTL-YUL
25h 39m1 stop
United Airlines Logo
9:25 am - 9:00 pmYUL-STL
12h 35m1 stop
$390United Airlines
Find Deal
mar., feb. 17 - jue., feb. 19
Multiple Airlines Logo
3:30 pm - 7:44 pmSTL-YUL
27h 14m2 stops
Multiple Airlines Logo
4:35 pm - 10:33 pmYUL-STL
30h 58m1 stop
$391Multiple Airlines
Find Deal
mié., dic. 10 - mié., dic. 17
Multiple Airlines Logo
2:12 pm - 12:30 amSTL-YUL
9h 18m1 stop
Multiple Airlines Logo
6:45 am - 10:03 amYUL-STL
28h 18m2 stops
$398Multiple Airlines
Find Deal
dom., nov. 16 - sáb., nov. 22
Multiple Airlines Logo
2:47 pm - 4:23 pmSTL-YUL
24h 36m1 stop
Multiple Airlines Logo
8:00 am - 10:33 pmYUL-STL
15h 33m2 stops
$414Multiple Airlines
Find Deal
jue., dic. 11 - dom., dic. 14
United Airlines Logo
4:49 pm - 10:20 amSTL-YUL
16h 31m1 stop
United Airlines Logo
4:45 pm - 12:29 pmYUL-STL
20h 44m1 stop
$426United Airlines
Find Deal
lun., ene. 12 - mar., ene. 13
Multiple Airlines Logo
2:12 pm - 12:30 amSTL-YUL
9h 18m1 stop
Multiple Airlines Logo
6:45 am - 10:03 amYUL-STL
28h 18m1 stop
$450Multiple Airlines
Find Deal
dom., nov. 16 - sáb., nov. 22
Delta Logo
6:39 am - 6:54 pmSTL-YUL
11h 15m2 stops
Delta Logo
9:34 am - 8:45 pmYUL-STL
12h 11m2 stops
$612Delta
Find Deal
lun., dic. 15 - mar., ene. 6
Delta Logo
6:39 am - 6:54 pmSTL-YUL
11h 15m2 stops
Delta Logo
9:34 am - 8:45 pmYUL-STL
12h 11m2 stops
$643Delta
Find Deal
lun., dic. 15 - mar., ene. 6

United Airlines flights from St. Louis to Montreal

Our best United Airlines deals on St. Louis to Montreal flight tickets
United Airlines
Feb 17
STL7:41 amLambert-St Louis
25h 39m
1 stop
YUL10:20 amMontreal Pierre Elliott Trudeau Intl
Feb 19
YUL9:25 amMontreal Pierre Elliott Trudeau Intl
12h 35m
1 stop
STL9:00 pmLambert-St Louis
$390
Find similar
United Airlines
Jan 12
STL4:49 pmLambert-St Louis
16h 31m
1 stop
YUL10:20 amMontreal Pierre Elliott Trudeau Intl
Jan 13
YUL4:45 pmMontreal Pierre Elliott Trudeau Intl
20h 44m
1 stop
STL12:29 pmLambert-St Louis
$426
Find similar
United Airlines
Jan 12
STL9:57 amLambert-St Louis
10h 45m
2 stops
YUL9:42 pmMontreal Pierre Elliott Trudeau Intl
Jan 13
YUL1:10 pmMontreal Pierre Elliott Trudeau Intl
10h 48m
1 stop
STL10:58 pmLambert-St Louis
$466
Find similar

Delta flights from St. Louis to Montreal

Our best Delta deals on St. Louis to Montreal flight tickets
Delta
Dec 15
STL6:39 amLambert-St Louis
11h 15m
2 stops
YUL6:54 pmMontreal Pierre Elliott Trudeau Intl
Jan 6
YUL9:34 amMontreal Pierre Elliott Trudeau Intl
12h 11m
2 stops
STL8:45 pmLambert-St Louis
$612
Find similar
Delta
Dec 15
STL6:39 amLambert-St Louis
11h 15m
2 stops
YUL6:54 pmMontreal Pierre Elliott Trudeau Intl
Jan 6
YUL9:34 amMontreal Pierre Elliott Trudeau Intl
12h 11m
2 stops
STL8:45 pmLambert-St Louis
$643
Find similar
Delta
Oct 31
STL7:05 amLambert-St Louis
10h 35m
2 stops
YUL6:40 pmMontreal Pierre Elliott Trudeau Intl
Nov 3
YUL2:25 pmMontreal Pierre Elliott Trudeau Intl
8h 13m
2 stops
STL9:38 pmLambert-St Louis
$1,128
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from St. Louis to Montreal that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated octubre 28, 2025.
Use the filters below to find and compare flights from St. Louis to Montreal that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

vie. 1/16

6:44 pm-3:08 pm

1 stop19h 24m

Montreal Pierre Elliott Trudeau Intl

lun. 1/19

3:52 pm-10:21 am

1 stop19h 29m

$376

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

jue. 12/11

2:47 pm-4:23 pm

1 stop24h 36m

Montreal Pierre Elliott Trudeau Intl

dom. 12/14

4:35 pm-8:59 am

1 stop17h 24m

$389

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

mar. 2/17

7:41 am-10:20 am

1 stop25h 39m

Montreal Pierre Elliott Trudeau Intl

jue. 2/19

9:25 am-9:00 pm

1 stop12h 35m

$390

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

mié. 12/10

3:30 pm-7:44 pm

2 stops27h 14m

Montreal Pierre Elliott Trudeau Intl

mié. 12/17

4:35 pm-10:33 pm

1 stop30h 58m

$391

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

dom. 11/16

2:12 pm-12:30 am

1 stop9h 18m

Montreal Pierre Elliott Trudeau Intl

sáb. 11/22

6:45 am-10:03 am

2 stops28h 18m

$398

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

jue. 12/11

2:47 pm-4:23 pm

1 stop24h 36m

Montreal Pierre Elliott Trudeau Intl

dom. 12/14

8:00 am-10:33 pm

2 stops15h 33m

$414

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

lun. 1/12

4:49 pm-10:20 am

1 stop16h 31m

Montreal Pierre Elliott Trudeau Intl

mar. 1/13

4:45 pm-12:29 pm

1 stop20h 44m

$426

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

dom. 11/16

2:12 pm-12:30 am

1 stop9h 18m

Montreal Pierre Elliott Trudeau Intl

sáb. 11/22

6:45 am-10:03 am

1 stop28h 18m

$450

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

lun. 12/15

6:39 am-6:54 pm

2 stops11h 15m

Montreal Pierre Elliott Trudeau Intl

mar. 1/6

9:34 am-8:45 pm

2 stops12h 11m

$612

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

lun. 12/15

6:39 am-6:54 pm

2 stops11h 15m

Montreal Pierre Elliott Trudeau Intl

mar. 1/6

9:34 am-8:45 pm

2 stops12h 11m

$643

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 19 resultsSorted by cheapest first
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See travel insights to Montreal from

How to get the cheapest flight ticket from St. Louis to Montreal

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to Montreal?

The cheapest month to fly to Montreal from St. Louis is in June. Flight prices, which tend to average around $286, are often lower during this time because this is during the off-season. If you are unable to visit Montreal during the month of June, then departing from St. Louis during the month August is also very affordable. Most momondo users find prices during this month for around $462.

What is the cheapest day to depart on your flight to Montreal?

The cheapest day to depart from St. Louis to Montreal is on a Monday when prices can be found for as low as $1,031. Flights from St. Louis to Montreal on a Friday will generally be more expensive and average around $1,222. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

What is the cheapest time of day to depart on your flight to Montreal?

Our most recent data shows that the best time of day to fly to Montreal is in the evening. Flights from St. Louis to Montreal during this time can be as low as $266. At noon is when there is more demand to fly to Montreal, so prices are often more expensive at around $1,098 per ticket.

What is the cheapest Lambert-St Louis to Montreal flight route?

Fly from Lambert-St Louis to Montreal Pierre Elliott Trudeau Intl for the best Lambert-St Louis - Montreal flight prices

What cabin class options are available on Lambert-St Louis to Montreal flights?

There are 3 cabin classes available to choose from on Lambert-St Louis to Montreal flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on St. Louis to Montreal flights?

No. A direct flight is the cheapest option for a flight between St. Louis to Montreal.

When to book flights from St. Louis to Montreal

Are you open to changing your travel dates? Check out the ideal times to fly from St. Louis to Montreal according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap St. Louis to Montreal (STL to YMQ) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to Montreal

Best Price Found

$538

Direct flights

None
The best one-way flight to Montreal from St. Louis in the past 72 hours is $538. The best round-trip flight deal from St. Louis to Montreal found on momondo in the last 72 hours is $771.
There are no direct flights from St. Louis to Montreal. Popular non-direct route for this connection is Lambert-St Louis Airport - Montreal Pierre Elliott Trudeau Intl Airport.
Search flight deals

  • How far is Lambert-St Louis to Montreal by plane?

    The distance between Lambert-St Louis and Montreal is about 973.0 mi. A reasonable flight in good conditions will take 5h 05m.

  • When did momondo last update prices for flights from Lambert-St Louis Airport to Montreal?

    Prices for flights from Lambert-St Louis Airport to Montreal are updated daily.

  • How many operators does momondo search for flights from Lambert-St Louis Airport to Montreal?

  • How old do you have to be to fly from Lambert-St Louis Airport to Montreal?

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Lambert-St Louis Airport to Montreal.

  • What documentation or ID do you need to fly to Montreal?

    The required travel and health documents for your Montreal trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Montreal. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

  • What is the most popular plane model from St. Louis to Montreal?

  • What is the most popular airline from St. Louis to Montreal?

Best airlines flying from St. Louis to Montreal

Compare and see reviews for airlines that fly from St. Louis to Montreal with momondo
Airline
Rating
Free Cancellation
Price
United AirlinesPriceFrom $246Free CancellationRating
7.4
8,996 reviews
Search United Airlines flights
DeltaPriceFrom $255Free CancellationRating
7.9
7,995 reviews
Search Delta flights
Air CanadaPriceFrom $285Free CancellationRating
7.1
10,370 reviews
Search Air Canada flights
American AirlinesPriceFrom $348Free CancellationRating
7.2
11,033 reviews
Search American Airlines flights

Why use momondo?

Why should I use momondo to find a flight deal from St. Louis to Montreal?

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from St. Louis to Montreal for you.

Can I find flights from St. Louis to Montreal with flexible booking policies on momondo?

All flight searches from St. Louis to Montreal on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from St. Louis to Montreal?

Once all potential St. Louis to Montreal flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

I’m not ready to book a flight from St. Louis to Montreal right now. Can momondo alert me if prices change?

Yes. momondo can track prices for St. Louis to Montreal flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

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jue. 11/27
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Find better results for your trip to Canada

Fly into one of these airports located in Montreal

Airports listed have a maximum distance of 9.4 mi from Montreal
Montreal St Hubert Airport
Montreal Pierre Elliott Trudeau Intl Airport