$160 Cheap United flights Washington (DCA) to Ontario (ONT)

View $160 flight on Thu, Nov 27, 2025Opens in a new window

$160 Cheap United flights Washington (DCA) to Ontario (ONT)

Prices were available within the past 7 days and start at $160 for one-way flights and $333 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Mon, Nov 24 - Wed, Dec 10
DCA
Washington
ONT
Ontario
$333 Roundtrip, found 14 hours ago
$333
Roundtrip
found 14 hours ago
Select United flight, departing Mon, Nov 24 from Washington to Ontario, returning Wed, Dec 10, priced at $333 found 14 hours ago
Flights from Washington (DCA) to Ontario (ONT)
Origin airport
Ronald Reagan Washington National
Destination airport
Los Angeles - Ontario Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Frontier Airlines, Hawaiian Airlines, JetBlue Airways, Southwest Airlines, United
Popular airline
Frontier Airlines
Distance
2258 mi

Frequently asked questions

How much is a United Airlines flight from Ronald Reagan Washington National Airport (DCA) to Los Angeles - Ontario Intl. Airport (ONT)?
Grab affordable round-trip United Airlines flights from $333 from DCA to ONT by organizing your results from "Price (lowest to highest)" on Expedia. Or search for options from $160 for a one-way trip.**These prices were available on Expedia within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.
What is the cheapest month to fly from DCA to ONT with United Airlines?
Search for round-trip or one-way flights to Ontario in January or April. You could find cheaper fares with United Airlines during these off-peak months.
What is the cheapest time to book flights from Ronald Reagan Washington National Airport (DCA) to Los Angeles - Ontario Intl. Airport (ONT) with United Airlines?
Begin your search one to three months before your departure to score cheaper fares on United Airlines flights from Ronald Reagan Washington National Airport (DCA) to Los Angeles - Ontario Intl. Airport (ONT). You can save 25% by booking your domestic flight 34 to 86 days in advance versus last-minute reservations made 6 to 12 days out. You could also cut costs by buying your fare on a Sunday, as it's 6% cheaper on average than a Monday, the most expensive day to book.* Get your timing right, and you can enjoy significant savings on domestic journeys.*Ideal booking window recommendation is based on average round-trip ticket prices for January through November for 2024. Best day of the week to book recommendation is based on average round-trip ticket prices for January through October 2024. All data sourced from ARC's global airline sales database.
Does United Airlines fly nonstop from Ronald Reagan Washington National Airport (DCA) to Los Angeles - Ontario Intl. Airport (ONT)?
Click on our "Nonstop" filter when searching for direct United Airlines flights from DCA to ONT. It's also an easy way to compare other carriers offering the same direct trip.
What is the earliest United Airlines flight from DCA to ONT?
Browse United Airlines's earliest flights from DCA to ONT by checking our "Morning" and "Early Morning" filters. Not only will you get to where you're going sooner, early departures are also 20% less likely to be canceled.**Most reliable time of the day recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
What airports does United Airlines fly into in Ontario?
Hop on a United Airlines flight from Ronald Reagan Washington National Airport (DCA) to Ontario, and you'll probably land at Los Angeles - Ontario Intl. Airport (ONT). This is the airline's primary hub in this destination.
Why fly with United Airlines from DCA to ONT?
Offering a rewarding loyalty program, United Airlines is a popular choice for many travelers heading from DCA to ONT. Plus, if you're a United Mileage Plus and One Key™ member booking through Expedia, you could earn OneKeyCash™* on eligible flights along with your airline miles.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.
Can I change or cancel my United Airlines flight from Ronald Reagan Washington National Airport (DCA) to Los Angeles - Ontario Intl. Airport (ONT)?
Changes are often free within 24 hours of making a booking, but your airline may charge a fee after that. For more details about modifying your reservation, go to your "Trips," select your flight and click on "Manage Booking." If you want the flexibility to adjust your plans without being charged, tick the "Changes included" and "No cancel fee" filters when organizing your trip.

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*Available to One Key members.