Cheap flights from St. Louis to Ontario from £125

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1 stop
Tue, Jul 29
St. Louis STLOntario ONT

£125
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1 stop
Tue, Jul 29
St. Louis STLOntario ONT

£132
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1 stop
Wed, Jul 30
St. Louis STLOntario ONT

£146
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1 stop
Wed, Jul 30
St. Louis STLOntario ONT

£168
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1 stop
Wed, Jul 30
St. Louis STLOntario ONT

£168
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1 stop
Wed, Jul 30
St. Louis STLOntario ONT

£168
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Prices updated:

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1 stop
Sat, Aug 2 – Tue, Aug 5
St. Louis STLOntario ONT

£341
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1 stop
Sat, Aug 2 – Tue, Aug 5
St. Louis STLOntario ONT

£341
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1 stop
Sat, Aug 2 – Tue, Aug 5
St. Louis STLOntario ONT

£341
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1 stop
Sat, Aug 2 – Tue, Aug 5
St. Louis STLOntario ONT

£343
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1 stop
Sat, Aug 2 – Tue, Aug 5
St. Louis STLOntario ONT

£343
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1 stop
Wed, Jul 30 – Sat, Aug 2
St. Louis STLOntario ONT

£344
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Prices updated:

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How much do flights to Ontario cost?

Key info about flying to Ontario

Depart from
St. Louis Lambert International
Arrive to
Ontario International
Average flights per week
72
Flight distance
Worth visiting
Griffith Observatory

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

NameCarrier codeIATA CodePassport needed during booking
United AirlinesUALUANo
Alaska AirlinesASAASNo
Hawaiian AirlinesHALHANo

Weather in Ontario

Average Weather

MonthAverage monthly max temperatureAverage monthly min temperature
January18°C7°C
February18°C7°C
March19°C8°C
April23°C10°C
May25°C12°C
June29°C16°C
July33°C19°C
August33°C20°C
September32°C18°C
October27°C15°C
November22°C10°C
December17°C7°C
Hottest Month
33°C
August
Coldest month
7°C
February
Sunny days
340
days per year

14 day forecast

Friday
4 Jul
32°C18°C
11 Jul
34°C21°C
Saturday
5 Jul
34°C19°C
12 Jul
32°C19°C
Sunday
6 Jul
32°C19°C
13 Jul
33°C19°C
Monday
7 Jul
31°C19°C
14 Jul
33°C19°C
Tuesday
8 Jul
35°C19°C
15 Jul
33°C19°C
Wednesday
9 Jul
36°C21°C
16 Jul
32°C20°C
Thursday
10 Jul
35°C22°C
17 Jul
31°C20°C
The most popular airlines for this route are United Airlines, Alaska Airlines, and Hawaiian Airlines. St. Louis and Ontario have 72 direct flights per week.

Frequently asked questions

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

Explore alternative trips

Flights from St. Louis

Flights to Ontario

Popular routes

The nearest countries with flights to Ontario

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

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