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Get United's best fares today on flights from Ontario to Chicago

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Low fare calendar for flights from Ontario (ONT) to Chicago (ORD)

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Lowest PriceToday
*Prices have been available for round trips within the last 48 hours and may not be currently available. Fares listed may be Basic Economy, which is our most restrictive fare option and subject to additional restrictions. Additional baggage charges and fees for other optional service may apply. Other terms and conditions may apply.

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Weather in Chicago

Tuesday light rain
83°F 05/26/20
Wednesday light rain
78°F 05/27/20
Thursday light rain
76°F 05/28/20
Friday light rain
71°F 05/29/20
Saturday few clouds
61°F 05/30/20
Sunday few clouds
64°F 05/31/20
Monday few clouds
70°F 06/01/20
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