Cheap flights from St. Louis, MO to Ottawa, Canada

Flights starting at $236. Choose between United Airlines, Frontier Airlines, or Porter Airlines to find the best price.

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How much do flights to Ottawa cost?

Key info about flying to Ottawa

Depart from
St. Louis Lambert International
Arrive to
Ottawa Macdonald–Cartier International
Average flights per week
86
Flight distance
Worth visiting
Île Jésus - Island of Montreal

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

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

Weather in Ottawa

Average Weather

MonthAverage monthly max temperatureAverage monthly min temperature
January-5°C-13°C
February-3°C-12°C
March2°C-6°C
April10°C0°C
May18°C7°C
June22°C12°C
July25°C15°C
August24°C14°C
September20°C11°C
October13°C5°C
November5°C-1°C
December-1°C-7°C
Hottest Month
25°C
July
Coldest month
-13°C
January
Sunny days
223
days per year
Snow days
31
days per year

14 day forecast

Friday
6 Dec
-5°C-8°C
13 Dec
79%
-2°C-6°C
Saturday
7 Dec
82%
-5°C-8°C
14 Dec
70%
1°C-2°C
Sunday
8 Dec
69%
1°C-6°C
15 Dec
0°C-2°C
Monday
9 Dec
79%
-3°C-7°C
16 Dec
83%
4°C0°C
Tuesday
10 Dec
78%
2°C-6°C
17 Dec
22%
-1°C-5°C
Wednesday
11 Dec
79%
6°C-1°C
18 Dec
-4°C-6°C
Thursday
12 Dec
-5°C-8°C
19 Dec
76%
-5°C-6°C
The most popular airlines for this route are United Airlines, Frontier Airlines, Porter Airlines, WestJet, and Air Canada. St. Louis and Ottawa have 86 direct flights per week. When you arrive at Ottawa, consider visiting Île Jésus, and Island of Montreal.

Frequently asked questions

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