Alaska Airlines Flights from Ontario to Washington, D.C.

Flexpay logo

Book now. Pay later.

Spread the cost of your flight over low monthly payments.

Learn more

Lowest fares from Ontario to Washington, D.C.

*Displayed prices have been available within the past 24 hours and may not be available at the time of booking. Fares listed may be Saver fares, which is our most restrictive fare option and subject to additional restrictions. For roundtrip journeys, the price displayed—available within the past 24 hours—is the aggregate of the lowest available fare each way. Additional baggage charges and fees for optional products and services may apply. Other terms and conditions may apply.

One-way low-fare flights Ontario to Washington, D.C..*

$
keyboard_arrow_down
One-way low-fare flights Ontario to Washington, D.C..*
From
To
Fare Type
Dates
Price
Ontario (ONT)Washington, D.C. (IAD)One-way
|
Saver		Depart: Jan 16, 2026

From

$143

Seen: 17 hours ago

Ontario (ONT)Washington, D.C. (IAD)One-way
|
Saver		Depart: Feb 11, 2026

From

$199

Seen: 24 minutes ago

*Displayed prices have been available within the past 24 hours and may not be available at the time of booking. Fares listed may be Saver fares, which is our most restrictive fare option and subject to additional restrictions. For roundtrip journeys, the price displayed—available within the past 24 hours—is the aggregate of the lowest available fare each way. Additional baggage charges and fees for optional products and services may apply. Other terms and conditions may apply.