CA $192 Cheap Flights from Washington (DCA) to Ontario (ONT)

View CA $192 flight on Sat, Sep. 20, 2025Opens in a new window

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

  • Plan, book, fly with confidence

  • trending down icon

    Be in the know

    Get alerts if flight prices drop or rise*
  • bex rewards loyalty icon

    Book smarter

    Save up to 30% on select hotels after you book a flight*
  • payments icon

    Earn twice

    Earn your airline miles on top of our rewards
    Sign in

Cheap flights from Washington (DCA) to Ontario (ONT)

Prices were available within the past 7 days and start at CA $192 for one-way flights and CA $383 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Mon, Sep. 15 - Mon, Sep. 22
DCA
Washington
ONT
Ontario
CA $383 Roundtrip, found 4 days ago
CA $383
Roundtrip
found 4 days ago
Select Delta flight, departing Mon, Sep. 15 from Washington to Ontario, returning Mon, Sep. 22, priced at CA $383 found 4 days ago
American Airlines
Sat, Sep. 20 - Mon, Sep. 29
DCA
Washington
ONT
Ontario
CA $384 Roundtrip, found 3 days ago
CA $384
Roundtrip
found 3 days ago
Select American Airlines flight, departing Sat, Sep. 20 from Washington to Ontario, returning Mon, Sep. 29, priced at CA $384 found 3 days ago
American Airlines
Sat, Sep. 20 - Mon, Sep. 29
DCA
Washington
ONT
Ontario
CA $386 Roundtrip, found 3 days ago
CA $386
Roundtrip
found 3 days ago
Select American Airlines flight, departing Sat, Sep. 20 from Washington to Ontario, returning Mon, Sep. 29, priced at CA $386 found 3 days ago
Alaska Airlines
Mon, Sep. 15 - Mon, Sep. 22
DCA
Washington
ONT
Ontario
CA $415 Roundtrip, found 4 days ago
CA $415
Roundtrip
found 4 days ago
Select Alaska Airlines flight, departing Mon, Sep. 15 from Washington to Ontario, returning Mon, Sep. 22, priced at CA $415 found 4 days ago
American Airlines
Sat, Sep. 20 - Mon, Sep. 29
DCA
Washington
ONT
Ontario
CA $441 Roundtrip, found 3 days ago
CA $441
Roundtrip
found 3 days ago
Select American Airlines flight, departing Sat, Sep. 20 from Washington to Ontario, returning Mon, Sep. 29, priced at CA $441 found 3 days ago
American Airlines
Sat, Sep. 20 - Mon, Sep. 29
DCA
Washington
ONT
Ontario
CA $443 Roundtrip, found 3 days ago
CA $443
Roundtrip
found 3 days ago
Select American Airlines flight, departing Sat, Sep. 20 from Washington to Ontario, returning Mon, Sep. 29, priced at CA $443 found 3 days ago
American Airlines
Sat, Sep. 20 - Mon, Sep. 29
DCA
Washington
ONT
Ontario
CA $449 Roundtrip, found 3 days ago
CA $449
Roundtrip
found 3 days ago
Select American Airlines flight, departing Sat, Sep. 20 from Washington to Ontario, returning Mon, Sep. 29, priced at CA $449 found 3 days ago
American Airlines
Sat, Sep. 20 - Mon, Sep. 29
DCA
Washington
ONT
Ontario
CA $450 Roundtrip, found 3 days ago
CA $450
Roundtrip
found 3 days ago
Select American Airlines flight, departing Sat, Sep. 20 from Washington to Ontario, returning Mon, Sep. 29, priced at CA $450 found 3 days ago
JetBlue Airways
Sat, Sep. 20 - Mon, Sep. 29
DCA
Washington
ONT
Ontario
CA $510 Roundtrip, found 3 days ago
CA $510
Roundtrip
found 3 days ago
Select JetBlue Airways flight, departing Sat, Sep. 20 from Washington to Ontario, returning Mon, Sep. 29, priced at CA $510 found 3 days ago
United
Fri, Sep. 26 - Tue, Sep. 30
DCA
Washington
ONT
Ontario
CA $535 Roundtrip, found 2 days ago
CA $535
Roundtrip
found 2 days ago
Select United flight, departing Fri, Sep. 26 from Washington to Ontario, returning Tue, Sep. 30, priced at CA $535 found 2 days ago

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

February is typically the cheapest month to fly

From CA $191 - CA $501 per traveller.

Graph displaying average flight prices per month

Flight from Washington to Ontario (DCA - ONT) route information
Origin airport
Ronald Reagan Washington National
Destination airport
Los Angeles - Ontario Intl.
Airlines serving
Delta
Roundtrip price
CA $383
Distance
3614 km

Washington to Los Angeles Flights

The easy way to book your flights from Washington to Ontario 

With Expedia, it’s simple to find and book flights to Ontario from Washington whether you’re traveling for business or pleasure. Enter your travel dates, hit search, and choose your flight from 20 airlines that cover this route. There are nonstop flights to Los Angeles - Ontario Intl., too.  

Choose your preferred carrier and cabin class with the advanced search tool and select your ideal departure time. Then, if you want, you can see just nonstop or refundable flights. And if you’re traveling last minute, just enter the date to check out flights from Washington to Ontario today, tomorrow, or this week.  

 

Save dollars with cheap flights from Ronald Reagan Washington National, DCA to Los Angeles - Ontario Intl., ONT 

Sort your search results by price to find great deals on your flight from Washington to Ontario—you get all your cheapest options first. Grab yourself a bargain now—the lowest price on flights to Ontario from Washington currently is just CA $383 rising to CA $535.  

Here are more money-saving tips: 

  • Fly in September when flight prices are normally at their lowest 
  • Book about a month to 6 weeks before you travel for the best prices to Ontario  
  • Avoid peak season and weekends when flights can cost more
  • Early morning and late-night flights are sometimes cheaper, so try varying your travel times 
  • One surefire way to save money on your flight is to book your flight and hotel together with Expedia. Sometimes, the savings are so large that the flight is basically free! 

 

Reasons to choose Expedia for your flight to Ontario from Washington 

Whatever your destination, budget, or reason to travel, in just one quick search, you can choose from loads of flights, airlines, and cabin classes. The filters make it quick and easy to find your ideal flights, and if you choose one of the flexible options, you won’t be charged to change your flight. So book your flight to Ontario with Expedia today.

Frequently asked questions

How much is a flight from National Airport to Los Angeles - Ontario Intl. Airport (ONT)?
Start packing your bags, because round-trip flights from Ronald Reagan Washington National Airport (DCA) to Ontario Airport start from CA $383. That's based on fares advertised within the last 7 days on Expedia for flights departing within the next year. Prices can go up quickly, so book now to nab the best deal. Prices and availability are subject to change. Additional terms apply.
Do I need to pay a cancellation fee if I cancel my flight from Ronald Reagan Washington National Airport (DCA) to Los Angeles - Ontario Intl. Airport (ONT)?
The majority of flights can be cancelled online, but whether or not you incur a fee all comes down to your airline. If you do need to cancel your trip, follow the easy instructions in the Customer Service Portal.
How do I find cheap flights from DCA to Los Angeles - Ontario Intl. Airport (ONT) that have flexible change policies?
Select our "No change fees" filter to find flexible ticketing options for your flight from DCA to ONT. This allows you to secure a great deal ahead of time and still have the freedom to make changes without any extra fees. Keep in mind that you'll need to cover the fare difference.
How many hours is the flight from National Airport to Los Angeles - Ontario Intl. Airport (ONT)?
It takes roughly 7 hours and 14 minutes to fly from Ronald Reagan Washington National Airport (DCA) to Ontario Airport. But with some music and a magazine or two, the time will go by quicker.
How far is the flight from DCA to ONT?
Expect to be cruising at altitude for a while, as the flight distance between National Airport and Ontario Airport is 3,600 kilometres. Put together a playlist of your favourite songs before leaving home to stay entertained during your flight.
Which airlines fly direct from National Airport to Los Angeles - Ontario Intl. Airport (ONT)?
Direct flights aren't available, so you'll need to make at least one stop between DCA and Ontario Airport. Take advantage of the layover time to stretch your legs and enjoy some personal space.
Are National Airport to Ontario Airport flight tickets cheaper when they're purchased at the last minute?
Booking your trip from DCA to Los Angeles - Ontario Intl. Airport (ONT) last minute could be your ticket to a great deal. However, it could end up costing a great deal more! If you'd rather play it safe, book well ahead of your departure date. In fact, Expedia has some of the best bargains up to a year in advance. If your preferred air carrier hasn't released tickets yet, check back regularly as deals are updated all the time on Expedia.

Explore a world of travel with Expedia

Ontario nearby Airports

Los Angeles

Washington to Los Angeles Intl.
CA $299.10

Orange County

Washington to John Wayne
CA $463.50

Burbank

Washington nearby Airports

Washington

Washington Dulles Intl. to Ontario
CA $376.10

Baltimore

Baltimore Washington Intl. Thurgood Marshall to Ontario
CA $505.50
*Available to Expedia members.