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

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Low fare calendar for flights from Ontario (ONT) to Washington (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. 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 Washington

Sunday scattered clouds
51°F 12/15/19
Monday heavy intensity rain
34°F 12/16/19
Tuesday light rain
51°F 12/17/19
Wednesday sky is clear
41°F 12/18/19
Thursday sky is clear
33°F 12/19/19
Friday overcast clouds
34°F 12/20/19
Saturday overcast clouds
30°F 12/21/19
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