$104 Cheap Frontier Airlines flights Washington (DCA) to Ontario (ONT)

Make use of the “Price (lowest to highest)” filter on Expedia to look for cheap Frontier Airlines return flights from $183 from DCA to ONT. Affordable one-way tickets from $104 are available too.**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.

Frontier Airlines flights to Ontario are generally more affordable in the quieter months of January and April. Whether you’re in search of a one-way or a return ticket, you could land a better deal then.

To find cheap Frontier Airlines fares from Ronald Reagan Washington National Airport (DCA) to Los Angeles - Ontario Intl. Airport (ONT), start searching one to three months before your intended departure. Reserving domestic flights 34 to 86 days in advance could save you 25% compared to booking just 6 to 12 days ahead. The day you book can also influence what you pay. Sunday is generally the cheapest, while Monday is often the most expensive for domestic flights. You can save 6% on average by choosing to book on a Sunday.**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.

Simply enter your dates, hit search and select the “Nonstop” filter on Expedia to browse any direct flights from DCA to ONT with Frontier Airlines or other carriers.

Sort your results by “Early Morning” and “Morning” to find the earliest departures from DCA to ONT. Taking off early means flight cancellations are less likely.**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.

Frontier Airlines flights from Ronald Reagan Washington National Airport (DCA) to Ontario touch down at Los Angeles - Ontario Intl. Airport (ONT). This is the main gateway to this city.

A rewarding loyalty program and the chance to rack up points through Frontier Miles are the start of the reasons to travel from DCA to ONT with Frontier Airlines. Plus, when you sign up to Expedia’s free One Key™ program, you can receive OneKeyCash™* alongside any airline loyalty program earnings. You can put it toward your future trips.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.

Depending on the type of fare you purchased, a fee may apply if you cancel or reschedule your flight more than 24 hours after it has been confirmed. To secure plane tickets with more flexibility, select our “Changes included” or “No cancel fee” filter when looking for flights. For more information on canceling or changing your reservation, head to “Trips,” select your flight and click on “Manage Booking.”