$70 Cheap Flights from Washington (DCA) to Ontario (ONT)

View $70 flight on Thu, Nov 13, 2025Opens in a new window

Popular airlines from Ronald Reagan Washington National Airport (DCA) to Los Angeles - Ontario Intl. Airport (ONT)

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Cheap Flights from Washington to Ontario (DCA-ONT)

Prices were available within the past 7 days and start at $70 for one-way flights and $130 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frontier Airlines
Sat, Nov 8 - Sat, Nov 15
DCA
Washington
ONT
Ontario
$130 Roundtrip, found 9 hours ago
$130
Roundtrip
found 9 hours ago
Select Frontier Airlines flight, departing Sat, Nov 8 from Washington to Ontario, returning Sat, Nov 15, priced at $130 found 9 hours ago
Frontier Airlines
Sat, Nov 8 - Wed, Nov 12
DCA
Washington
ONT
Ontario
$140 Roundtrip, found 3 hours ago
$140
Roundtrip
found 3 hours ago
Select Frontier Airlines flight, departing Sat, Nov 8 from Washington to Ontario, returning Wed, Nov 12, priced at $140 found 3 hours ago
Frontier Airlines
Sat, Nov 8 - Sat, Nov 15
DCA
Washington
ONT
Ontario
$150 Roundtrip, found 9 hours ago
$150
Roundtrip
found 9 hours ago
Select Frontier Airlines flight, departing Sat, Nov 8 from Washington to Ontario, returning Sat, Nov 15, priced at $150 found 9 hours ago
Frontier Airlines
Sat, Nov 8 - Wed, Nov 12
DCA
Washington
ONT
Ontario
$160 Roundtrip, found 3 hours ago
$160
Roundtrip
found 3 hours ago
Select Frontier Airlines flight, departing Sat, Nov 8 from Washington to Ontario, returning Wed, Nov 12, priced at $160 found 3 hours ago
Frontier Airlines
Sat, Nov 8 - Sat, Nov 15
DCA
Washington
ONT
Ontario
$168 Roundtrip, found 9 hours ago
$168
Roundtrip
found 9 hours ago
Select Frontier Airlines flight, departing Sat, Nov 8 from Washington to Ontario, returning Sat, Nov 15, priced at $168 found 9 hours ago
Frontier Airlines
Tue, Nov 11 - Mon, Nov 17
DCA
Washington
ONT
Ontario
$170 Roundtrip, found 3 days ago
$170
Roundtrip
found 3 days ago
Select Frontier Airlines flight, departing Tue, Nov 11 from Washington to Ontario, returning Mon, Nov 17, priced at $170 found 3 days ago
Southwest Airlines
Wed, Dec 10 - Thu, Dec 11
DCA
Washington
ONT
Ontario
$196 Roundtrip, found 5 days ago
$196
Roundtrip
found 5 days ago
Select Southwest Airlines flight, departing Wed, Dec 10 from Washington to Ontario, returning Thu, Dec 11, priced at $196 found 5 days ago
American Airlines
Wed, Jan 28 - Sat, Jan 31
DCA
Washington
ONT
Ontario
$213 Roundtrip, found 1 day ago
$213
Roundtrip
found 1 day ago
Select American Airlines flight, departing Wed, Jan 28 from Washington to Ontario, returning Sat, Jan 31, priced at $213 found 1 day ago
Delta
Tue, Jan 20 - Tue, Jan 27
DCA
Washington
ONT
Ontario
$259 Roundtrip, found 1 day ago
$259
Roundtrip
found 1 day ago
Select Delta flight, departing Tue, Jan 20 from Washington to Ontario, returning Tue, Jan 27, priced at $259 found 1 day ago
United
Tue, Jan 20 - Tue, Jan 27
DCA
Washington
ONT
Ontario
$259 Roundtrip, found 1 day ago
$259
Roundtrip
found 1 day ago
Select United flight, departing Tue, Jan 20 from Washington to Ontario, returning Tue, Jan 27, priced at $259 found 1 day ago

Find the cheapest month to fly from Washington (DCA) to Ontario (ONT)

February is typically the cheapest month to fly

From $138 - $376 per traveler.

Alternative airports near Ontario

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to John Wayne SNA. Average driving time to city center is 42 minutes. Flights from $334
SNA
John Wayne
Average driving time to city center42 min
Flights from $334

Frequently asked questions

How much does a flight from Ronald Reagan Washington National Airport (DCA) to Los Angeles - Ontario Intl. Airport (ONT) cost?
Secure a cheap one-way flight from $70 or cheap return flight from $130 from Ronald Reagan Washington National Airport (DCA) to Los Angeles - Ontario Intl. Airport (ONT) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight offers on this route.
What is the cheapest month to fly from Ronald Reagan Washington National Airport (DCA) to Los Angeles - Ontario Intl. Airport (ONT)?
Planning your trip for November is a great way to save, as it's the cheapest month for flights between DCA and ONT. You'll often find the lowest prices during off-peak months.
What is the cheapest airline that flies from Ronald Reagan Washington National Airport (DCA) to Los Angeles - Ontario Intl. Airport (ONT)?
Expedia's filter tool lets you easily compare different airlines, flight durations and fares all in one place. Choose your preferences, then sort by "Price (lowest to highest)" to see which carrier offers the cheapest DCA to ONT flight.
How many flights per day from Ronald Reagan Washington National Airport (DCA) to Los Angeles - Ontario Intl. Airport (ONT)?
Nonstop flights from Ronald Reagan Washington National Airport (DCA) to Los Angeles - Ontario Intl. Airport (ONT) aren't available daily, so you'll need to take a flight with a layover. Explore your options with our filter tool. Enter your dates and pick either "1 Stop" or "2+ Stops."
What day of the week has the most flights from DCA to ONT?
You'll typically find Tuesday the quietest day for flights, while Fridays are often the busiest.* However this can change from season to season and during public holidays or peak travel times.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Ronald Reagan Washington National Airport (DCA) to Los Angeles - Ontario Intl. Airport (ONT)?
Opt for a flight from Ronald Reagan Washington National Airport (DCA) to Los Angeles - Ontario Intl. Airport (ONT) that leaves before 3 PM to reduce the likelihood of delays. Departures after this time are on average 22% more likely to be canceled.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
What airports do you fly into for Ontario from Ronald Reagan Washington National Airport (DCA)?
Los Angeles Intl. Airport (LAX) is the only airport in Ontario with direct flights from Ronald Reagan Washington National Airport (DCA). Check out the available options and find affordable fares on Expedia.
Is it cheaper to buy a plane ticket from Ronald Reagan Washington National Airport (DCA) to Los Angeles - Ontario Intl. Airport (ONT) last-minute?
Holding off until right before your break to book a flight from DCA to ONT generally means paying more. While you might find some last-minute deals, they aren't always guaranteed. Keep your travel schedule open for a better chance of snagging a bargain.
Is it cheaper to book a DCA to ONT flight and hotel package?
You'll generally save money by booking a DCA to ONT flight and hotel package compared to booking separately. In fact, travelers could save hundreds of dollars by bundling with Expedia. And it's simple to manage everything in one convenient place. After choosing your ideal accommodations and flights, consider other add-ons like tours, activities and car rentals.
Can I cancel or change the date of my flight from Ronald Reagan Washington National Airport (DCA) to Los Angeles - Ontario Intl. Airport (ONT)?
If you reserved your DCA to ONT flight within the last 24 hours, you may be able to cancel or modify it without any fees. Depending on the airline and the type of fare you purchased, additional charges may apply for changes after that time. Airline policies and contact information can be found in your itinerary or confirmation email. Or, visit our Customer Service portal for more information.

Travel information

Origin airport
Ronald Reagan Washington National
Destination airport
Los Angeles - Ontario Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Frontier Airlines, Hawaiian Airlines, Southwest Airlines, United
Roundtrip price
$130
Distance
2258 mi

Book with confidence

Washington to Ontario Flights

The cheapest times to fly from Washington to Ontario

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Washington to Ontario are during the month of November. You can find some of the cheapest flights from Washington to Ontario with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Washington to Ontario

Sunday is one of the best days to book for cheap flights from Washington to Ontario: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Washington to Ontario

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Washington to Ontario in 2025. You can also book with separate airlines for your outbound and return journeys, from $70 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Washington to Ontario flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Washington to Ontario airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Washington to Ontario Flights

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*Available to One Key members.