Cheap flights from Montreal to St. Louis, MO

Flights starting at CA$418. Choose between United Airlines, Porter Airlines, or Air Canada to find the best price.

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How much do flights to St. Louis cost?

Key info about flying to St. Louis

Depart from
Montréal–Pierre Elliott Trudeau International
Arrive to
St. Louis Lambert International
Average flights per week
115
Flight distance

Check-in for a flight from Montreal to St. Louis

NameCarrier codeIATA CodePassport needed during booking
United AirlinesUALUAYes
Porter AirlinesPOEPDNo
Air CanadaACAACYes
Frontier AirlinesFFTF9No
WestJetWJAWSNo

Weather in St. Louis

Average Weather

MonthAverage monthly max temperatureAverage monthly min temperature
January3°C-3°C
February6°C-2°C
March13°C3°C
April18°C8°C
May24°C14°C
June29°C19°C
July31°C21°C
August30°C20°C
September27°C16°C
October20°C10°C
November12°C3°C
December7°C0°C
Hottest Month
31°C
July
Coldest month
-3°C
January
Sunny days
262
days per year
Snow days
9
days per year

14 day forecast

Wednesday
4 Dec
12°C-3°C
11 Dec
5°C0°C
Thursday
5 Dec
-1°C-8°C
12 Dec
7°C0°C
Friday
6 Dec
2°C-4°C
13 Dec
12°C1°C
Saturday
7 Dec
10°C-2°C
14 Dec
11°C4°C
Sunday
8 Dec
81%
14°C5°C
15 Dec
15°C7°C
Monday
9 Dec
87%
14°C8°C
16 Dec
16°C8°C
Tuesday
10 Dec
7°C3°C
17 Dec
17°C9°C

Travel tips & how to get from Montreal to St. Louis

The cheapest price of a one-way ticket from Montreal to St. Louis is CA$252. Round trip fares cost between CA$532 at the lowest and CA$896 at most.
Travelers usually depart from Montréal–Pierre Elliott Trudeau International, or Montreal Saint-Hubert Longueuil when they travel from Montreal to St. Louis. The most popular airlines for this route are United Airlines, Porter Airlines, Air Canada, Frontier Airlines, and WestJet. Montreal and St. Louis have 115 direct flights per week.

Frequently asked questions

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