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

Flights starting at £187. Choose between United Airlines, Frontier Airlines, or Porter Airlines to find the best price.

One search, all the flights

We find you the best flight deals and travel hacks so that you can choose how to book.

Rise above all travel anxieties

With the Kiwi.com Guarantee we have your back with whatever happens.

Trusted by millions

Join over 10 million yearly travellers booking with ease.

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

What are the most popular routes to and from St. Louis?
What are the most popular routes to and from Ottawa?
What airports are near St. Louis?
What airports are near Ottawa?
Which airlines fly between St. Louis and Ottawa?
When's the best time to travel between St. Louis and Ottawa?
What flights operate between St. Louis and Ottawa?
How many airports are there near St. Louis?
How many airports are there near Ottawa?
What time do nonstop (direct) flights between St. Louis and Ottawa depart?
What time do nonstop (direct) flights between St. Louis and Ottawa arrive?
What time do flights between St. Louis and Ottawa depart?
What time do flights between St. Louis and Ottawa arrive?

Explore alternative trips

Flights from St. Louis

Flights to Ottawa

Popular routes

The nearest countries with flights to Ottawa

Here is a list of countries people are flying from

Other destination countries from St. Louis

Here is a list of countries people are flying to
Find the best connection from St. Louis to Ottawa
Search flights

Get more out of Kiwi.com with our mobile application

Download boarding passes

One-click booking

Get exclusive offers and prices

Mobile trip notifications

We hack the system,
you fly for less