Cheap flights from Ontario, CA to Chicago, IL

Flights starting at £66. Choose between Frontier Airlines, United Airlines, or Alaska Airlines to find the best price.

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How much do flights to Chicago cost?

Key info about flying to Chicago

Depart from
Ontario International
Arrive to
O Hare International
Average flights per week
40
Flight distance
Worth visiting
Art Institute of Chicago

Check-in for a flight from Ontario to Chicago

NameCarrier codeIATA CodePassport needed during booking
Frontier AirlinesFFTF9No
United AirlinesUALUAYes
Alaska AirlinesASAASNo

Weather in Chicago

Average Weather

MonthAverage monthly max temperatureAverage monthly min temperature
January0°C-6°C
February0°C-5°C
March6°C0°C
April11°C4°C
May17°C10°C
June22°C16°C
July25°C20°C
August25°C19°C
September22°C16°C
October15°C10°C
November8°C3°C
December2°C-1°C
Hottest Month
25°C
July
Coldest month
-6°C
January
Sunny days
253
days per year
Snow days
17
days per year

14 day forecast

Monday
9 Dec
10°C4°C
16 Dec
81%
8°C1°C
Tuesday
10 Dec
-1°C-2°C
17 Dec
70%
-3°C-4°C
Wednesday
11 Dec
13%
-1°C-6°C
18 Dec
72%
-1°C-4°C
Thursday
12 Dec
-9°C-11°C
19 Dec
77%
-8°C-10°C
Friday
13 Dec
61%
0°C-9°C
20 Dec
2°C-8°C
Saturday
14 Dec
0°C-3°C
21 Dec
2°C0°C
Sunday
15 Dec
87%
5°C1°C
22 Dec
2°C-1°C
Book your trip to arrive at O Hare International, Chicago Midway International, or Chicago Rockford International. The most popular airlines for this route are Frontier Airlines, United Airlines, and Alaska Airlines. Ontario and Chicago have 40 direct flights per week.

Frequently asked questions

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

Explore alternative trips

Flights from Ontario

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Popular routes

The nearest countries with flights to Chicago

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