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United flights from Ontario to Washington, D.C. starting at

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Low fare calendar for flights from Ontario (ONT) to Washington, D.C. (IAD)

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Lowest PriceToday
*Prices have been available for round trips within the last 48 hours and may not be currently available. For Economy class, 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.

More United deals on Ontario (ONT) to Washington, D.C. (IAD) flights

There are no flight results that match your filtered criteria based on user searches within the last 24 hours.

*Prices have been available for round trips within the last 48 hours and may not be currently available. For Economy class, 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.

Weather in Washington, D.C.

Friday broken clouds
72°F 10/23/20
Saturday light rain
72°F 10/24/20
Sunday light rain
49°F 10/25/20
Monday overcast clouds
60°F 10/26/20
Tuesday light rain
67°F 10/27/20
Wednesday broken clouds
60°F 10/28/20
Thursday heavy intensity rain
61°F 10/29/20
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