Flights from Ontario to Washington, D.C. from $ 311*
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1 Passenger, Economy
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Featured daily fares for flights from Ontario (ONT) to Washington, D.C. (IAD)
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More United deals on Ontario (ONT) to Washington, D.C. (IAD) flights
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From | To | Fare Type | Dates | Price |
|---|---|---|---|---|
| Ontario (ONT) | Washington, D.C. (IAD) | Roundtrip | Economy | 04/16/26 - 04/18/26 | from $ 359 Viewed: 10 hours ago |
| Ontario (ONT) | Washington, D.C. (IAD) | Roundtrip | Economy | 05/12/26 - 05/16/26 | from $ 364 Viewed: 1 day ago |
| Ontario (ONT) | Washington, D.C. (IAD) | Roundtrip | Economy | 05/13/26 - 06/15/26 | from $ 474 Viewed: 16 hours ago |
| Ontario (ONT) | Washington, D.C. (IAD) | Roundtrip | Economy | 04/14/26 - 04/16/26 | from $ 520 Viewed: 18 hours ago |
| Ontario (ONT) | Washington, D.C. (IAD) | Roundtrip | Economy | 05/15/26 - 05/25/26 | from $ 580 Viewed: 19 hours ago |
| Ontario (ONT) | Washington, D.C. (IAD) | Roundtrip | Economy | 04/14/26 - 04/16/26 | from $ 615 Viewed: 18 hours ago |
| Ontario (ONT) | Washington, D.C. (IAD) | Roundtrip | Economy | 05/12/26 - 05/16/26 | from $ 678 Viewed: 1 day ago |
| Ontario (ONT) | Washington, D.C. (IAD) | Roundtrip | Economy | 04/16/26 - 04/18/26 | from $ 692 Viewed: 10 hours ago |
*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. Schedules are subject to change without notice.
