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$79 Cheap Flights from Washington (DCA) to Ontario Intl. Airport (ONT)

View $79 flight on Wed, Nov 4, 2026Opens in a new window

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

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Cheap Flights from Washington to Ontario Intl. Airport (DCA-ONT)

Prices were available within the past 7 days and start at $79 for one-way flights and $158 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frontier Airlines
Thu, Oct 22 - Mon, Oct 26
DCA
Washington
ONT
Ontario
$158 Roundtrip, just found
$158
Roundtrip
just found
Select Frontier Airlines flight, departing Thu, Oct 22 from Washington to Ontario, returning Mon, Oct 26, priced at $158 just found
Frontier Airlines
Thu, Nov 12 - Mon, Nov 16
DCA
Washington
ONT
Ontario
$168 Roundtrip, found 16 hours ago
$168
Roundtrip
found 16 hours ago
Select Frontier Airlines flight, departing Thu, Nov 12 from Washington to Ontario, returning Mon, Nov 16, priced at $168 found 16 hours ago
Frontier Airlines
Fri, Oct 30 - Tue, Nov 3
DCA
Washington
ONT
Ontario
$175 Roundtrip, just found
$175
Roundtrip
just found
Select Frontier Airlines flight, departing Fri, Oct 30 from Washington to Ontario, returning Tue, Nov 3, priced at $175 just found
Frontier Airlines
Fri, Sep 11 - Tue, Sep 15
DCA
Washington
ONT
Ontario
$185 Roundtrip, found 15 hours ago
$185
Roundtrip
found 15 hours ago
Select Frontier Airlines flight, departing Fri, Sep 11 from Washington to Ontario, returning Tue, Sep 15, priced at $185 found 15 hours ago
Frontier Airlines
Sat, Oct 3 - Sat, Oct 10
DCA
Washington
ONT
Ontario
$192 Roundtrip, found 8 hours ago
$192
Roundtrip
found 8 hours ago
Select Frontier Airlines flight, departing Sat, Oct 3 from Washington to Ontario, returning Sat, Oct 10, priced at $192 found 8 hours ago
Frontier Airlines
Tue, Oct 27 - Wed, Oct 28
DCA
Washington
ONT
Ontario
$195 Roundtrip, found 3 hours ago
$195
Roundtrip
found 3 hours ago
Select Frontier Airlines flight, departing Tue, Oct 27 from Washington to Ontario, returning Wed, Oct 28, priced at $195 found 3 hours ago
Southwest Airlines
Thu, Sep 10 - Thu, Sep 17
DCA
Washington
ONT
Ontario
$200 Roundtrip, found 5 hours ago
$200
Roundtrip
found 5 hours ago
Select Southwest Airlines flight, departing Thu, Sep 10 from Washington to Ontario, returning Thu, Sep 17, priced at $200 found 5 hours ago
Delta
Tue, Oct 27 - Wed, Oct 28
DCA
Washington
ONT
Ontario
$213 Roundtrip, found 3 hours ago
$213
Roundtrip
found 3 hours ago
Select Delta flight, departing Tue, Oct 27 from Washington to Ontario, returning Wed, Oct 28, priced at $213 found 3 hours ago
American Airlines
Wed, Sep 23 - Sat, Oct 3
DCA
Washington
ONT
Ontario
$231 Roundtrip, found 12 hours ago
$231
Roundtrip
found 12 hours ago
Select American Airlines flight, departing Wed, Sep 23 from Washington to Ontario, returning Sat, Oct 3, priced at $231 found 12 hours ago
United
Thu, Feb 18 - Wed, Feb 24
DCA
Washington
ONT
Ontario
$256 Roundtrip, found 11 hours ago
$256
Roundtrip
found 11 hours ago
Select United flight, departing Thu, Feb 18 from Washington to Ontario, returning Wed, Feb 24, priced at $256 found 11 hours ago

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. Cheapest option available. Average driving time to city center is 42 minutes. Flights from $388
SNA
John Wayne
Cheapest
Average driving time to city center42 min
Flights from $388

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

January is typically the cheapest month to fly

From $130 - $312 per traveler.

What you need to know for your flight from Ronald Reagan Washington National to Ontario Intl. Airport

Washington (DCA) to Ontario (ONT) at a glance

Travel from Washington (DCA) to Ontario (ONT) with a range of airlines on this domestic long-haul route. Discover options for cheap flights from Washington to Ontario, whether you prefer full-service carriers or budget-friendly choices. Compare itineraries to find the best fit for your schedule and travel plans while planning your visit to Ontario's renowned attractions and neighborhoods. Get essential information about flights from Ronald Reagan Washington National Airport (DCA) to Los Angeles - Ontario International Airport (ONT).

  • Fastest flight duration: around 6h 45m in-flight, plus roughly 1h 30m layover with one stop
  • Route distance: roughly 2,300 miles (3,700 km)
  • Flights per week: around 15+ flights with multiple daily departures on average
  • Typical fares (one-way): economy tickets often range from $95–$440, depending on seasonality and how far ahead you book

Flights from Ronald Reagan Washington National Airport (DCA) to Los Angeles - Ontario International Airport (ONT)

Based on recent traveler bookings, here are the top airlines favored for one-stop and multi-stop flights from Washington to Ontario. Popular layover options include Denver International Airport (DEN) with an average layover of about 2 hours and 15 minutes, Dallas-Fort Worth International Airport (DFW) with around a 1-hour and 15-minute layover, and Sky Harbor International Airport (PHX), also with a 1-hour and 15-minute layover. These choices offer the flexibility to balance price, total travel time, and cabin class for your ideal itinerary.

  • American Airlines: This full-service airline provides both one-stop and multi-stop options, with one-way ticket prices generally falling between $140 and $470. It represents around 38% of the departures on this route, featuring an in-flight duration of 6 hours and 45 minutes, leading to a total travel time of about 8 hours and 15 minutes.
  • Frontier Airlines: As a low-cost option, Frontier Airlines offers one-stop flights with one-way fares typically priced between $95 and $295. This carrier accounts for about 21% of the flights on this route, with a flight time of 6 hours and 45 minutes, culminating in a total journey of roughly 8 hours and 15 minutes, including layover time.
  • United: Another full-service choice, United provides one-stop service with one-way fares ranging from $120 to $435. This airline constitutes roughly 17% of the departures on this route, featuring an in-flight duration of 6 hours and 45 minutes and a total journey time of approximately 8 hours and 15 minutes, factoring in the layover.
  • Southwest Airlines: Known for its low-cost fares, Southwest offers both one-stop and multi-stop services. One-way tickets usually range from $140 to $470, with the airline making up about 17% of the departures on this route. The typical flight time is 6 hours and 45 minutes, leading to a total journey time of around 8 hours and 15 minutes.
  • Delta: As a full-service carrier, Delta provides one-stop service with one-way fares that typically range from $150 to $445. This airline covers approximately 7% of the departures on this route, with a flying time of 6 hours and 45 minutes and a total journey duration of about 8 hours and 15 minutes, including layover time.

Travelers can enhance their experience on flights from Washington to Ontario by upgrading to first class service offered by American Airlines on this route.

Best time to fly from Washington (DCA) to Ontario (ONT)

The most popular months for travelers flying from Washington to Ontario are January, March, and April, when peak temperatures in Ontario reach up to 62.6°F in April. If you prefer quieter travel, consider September, the least busy and relatively cheaper time to visit with fewer crowds and temperatures around 75°F. For better deals, May usually offers the lowest average one-way fare around $218. Flight availability peaks in December, with approximately 21 flights per week, making it easier to find convenient departure times. January and February have the fewest flights, with approximately 14 flights per week.

  • Cheapest time to fly: May usually offers good deals with average one-way fare around $218, roughly 11% cheaper than the yearly average.
  • More budget-friendly months to fly: January, February, and September typically offer average one-way fares of around $224.
  • Most flight options: December has the highest number of flights from Washington to Ontario, with approximately 21 flights per week, giving you more flexibility in scheduling your trip.
calendar iconMonthtemperature iconTemperaturecrowd level iconDemandflights iconWeekly Flightsprice iconAverage one-way Fare
January56.3°F (13.5°C)Moderately High14$221
February56.7°F (13.7°C)Average14$224
March59.0°F (15.0°C)Moderately High17$269
April62.6°F (17.0°C)Moderately High17$239
May65.3°F (18.5°C)Average20$218
June69.8°F (21.0°C)Average19$252
July74.3°F (23.5°C)Average20$246
August75.7°F (24.3°C)Moderately Low17$243
September75.0°F (23.9°C)Moderately Low17$227
October69.6°F (20.9°C)Average17$269
November62.6°F (17.0°C)Moderately Low17$244
December55.9°F (13.3°C)Average21$283

*Average one-way fare is based on Expedia flight booking data from January 2025 to April 2026 for the specified route and travel class and may change depending on availability, dates, and demand.

Alternative routes from Washington (DCA) to Ontario (ONT)

  • Washington to Ontario (IAD-ONT): Located approximately 23 miles from Ronald Reagan Washington National Airport (DCA), Washington Dulles International Airport (IAD) offers one-way economy fares that generally vary between $115 and $480, influenced by the season and timing of booking. This route is primarily served by one-stop flights, with common layover points at Denver International Airport (DEN) and Dallas-Fort Worth International Airport (DFW). Major airlines operating on this route include United and low-cost carrier Southwest Airlines. First-class service is also offered here.
  • Washington to Orange County (DCA-SNA): John Wayne Airport (SNA), situated about 31 miles from Los Angeles - Ontario International Airport (ONT), typically has one-way economy fares ranging from $100 to $490, subject to seasonal variations and booking lead time. Travelers can choose from both one-stop and multi-stop flight options, with key layovers at Denver International Airport (DEN) and O'Hare International Airport (ORD). Leading airlines for this route include American Airlines and budget option Frontier Airlines. First-class seating is available on this route as well.

How to find the best prices for flights from Washington (DCA) to Ontario (ONT)

Getting some of the best deals on flights from Washington to Ontario is all about timing and flexibility. Here are some key tips to help you save:

  1. Best times to book and fly: cheaper fares are typically found when booking at least two months in advance, although most travelers book between two to eight weeks ahead. evening departures from 6 PM to midnight tend to offer lower prices, even though afternoon flights from 12 PM to 6 PM are more popular. additionally, flying on Saturday provides both cheaper prices and is the most sought-after travel day.
  2. Set up price alerts: stay updated on price changes by using Expedia's Price Tracker. Receive alerts when fares drop for your selected route.
  3. Bundle and save: bundle your flight and hotel to save on Expedia, or unlock a hotel deal after booking your flight.*
  4. Compare flight options: use Expedia's search tool to compare airlines, routes, direct vs. non-direct flights, and flight times. You can also sort by price to find the most affordable options.
  5. Stay flexible with dates: being open to different travel days can sometimes help you find better prices on flights and hotels.
  6. Think about luggage: nowadays, it's important to check the airline's baggage policies to find the best value. That may be paying for an additional carry-on bag or booking a ticket with checked luggage included. Either way, double-check your allowance before confirming your booking to avoid excess baggage fees at the airport.

*Members only. Savings vary and are not available on all bundles. Select hotels.

Arriving at Los Angeles - Ontario International Airport from Ronald Reagan Washington National Airport

Ontario welcomes travelers from Washington with a range of transport options based on price, convenience, and proximity. For departures, Ronald Reagan Washington National Airport is roughly a 10-minute drive (covering about 5 miles) from central Washington. Here's how to reach Ontario efficiently:

  • Hotel transfer: Transfers offer a convenient way to reach your hotel in Ontario, with options including free hotel shuttles and private rides, which can be arranged in advance with your hotel.
  • Car rental: Renting a car from Los Angeles - Ontario International Airport is a great option if you plan to explore and sightsee beyond the city. Browse cheap car rentals at Los Angeles - Ontario International Airport on Expedia.
  • Taxi/ride-hailing: Taxis and ride-hailing services may be available from designated pickup areas outside the terminal, check locally on arrival.
  • Public transportation: From Los Angeles - Ontario International Airport, Panama City Seaport, a seaport, is located about 1.6 miles from the airport by car, while Rancho Cucamonga Station, a train station, is situated approximately 3.7 miles away, also reachable by car.

Frequently asked questions

How much does a flight from Washington, DC (DCA-Ronald Reagan Washington National) to Ontario, CA (ONT-Los Angeles - Ontario Intl.) cost?
You can find cheap one-way flights from $79 and cheap return flights from $158 Washington, DC (DCA-Ronald Reagan Washington National) to Ontario, CA (ONT-Los Angeles - Ontario Intl.) with Expedia. One-way flights typically cost between $215 and $1169, and return flights often range between $423 and $1647. Flight prices vary based on the month and day of the week you want to travel, as well as the airline and how far in advance you book your ticket. Filter your search on Expedia by "Price (lowest to highest)" to see the cheapest fares first, and use the Price Tracking tool to receive alerts when Washington, DC (DCA-Ronald Reagan Washington National) to Ontario, CA (ONT-Los Angeles - Ontario Intl.) ticket fares go up or down.*Typical price ranges based on flights available on Expedia in the last year. Prices include multi-airline options.
What is the cheapest month to fly from Washington, DC (DCA-Ronald Reagan Washington National) to Ontario, CA (ONT-Los Angeles - Ontario Intl.)?
August is the cheapest month to fly from Washington, DC (DCA) to Ontario, CA (ONT), with average return fares around $383. This is about 18% lower than the average price throughout the year, as summer travel typically slows down after peak season. Other budget-friendly months include January and September.*Averages based on flights available on Expedia in the last year.
Which airlines fly direct from Washington, DC (DCA-Ronald Reagan Washington National) to Ontario, CA (ONT-Los Angeles - Ontario Intl.)?
Enter DCA to ONT and your travel dates, then apply the 'Nonstop' filter to see only direct flights.
What is the cheapest airline that flies from Washington, DC (DCA-Ronald Reagan Washington National) to Ontario, CA (ONT-Los Angeles - Ontario Intl.)?
Southwest Airlines is one of the cheapest airlines offering connecting flights from Ronald Reagan Washington National (DCA) to Los Angeles - Ontario Intl. (ONT) with a layover in Kansas City Intl. starting from around $192. Use Expedia's search tool to compare the prices and schedules of airlines that fly this route to find the best option for your plans and budget.*Prices based on flights available on Expedia in the last year.
How do I find cheap flights from Washington, DC (DCA-Ronald Reagan Washington National) to Ontario, CA (ONT-Los Angeles - Ontario Intl.)?
To find a cheap flight from Washington, DC (DCA-Ronald Reagan Washington National) to Ontario, CA (ONT-Los Angeles - Ontario Intl.), be flexible with your dates. Traveling outside of peak vacation months and booking a mid-week flight can help you save. Early morning and late night flights are often more affordable, too. Expedia allows you to compare flight times, airlines and routes all in one place to find low fares. You can also set up Price Tracking and receive alerts when fares go up or down.
What is the best time to fly from Washington, DC (DCA-Ronald Reagan Washington National) to Ontario, CA (ONT-Los Angeles - Ontario Intl.)?
The best times to fly from Washington, DC (DCA) to Ontario, CA (ONT) are typically in August and January. In August, you can find return flights at around $383, making it a budget-friendly option. January is also a great choice for lower fares, as travel demand is generally lower after the holiday season. While August is cheaper, January offers a quieter travel experience, so you can choose based on your preferences.*Prices based on flights available on Expedia in the last year.
What is the earliest flight from Washington, DC (DCA-Ronald Reagan Washington National) to Ontario, CA (ONT-Los Angeles - Ontario Intl.)?
The earliest flight from Ronald Reagan Washington National Airport (DCA) to Ontario International Airport (ONT) typically leaves at around 5:00 AM, operated by American Airlines. This seasonal service is available in April, May, and June, and an early flight can help you arrive in Ontario with plenty of time to spare. To compare early flights on Expedia, select the "Early Morning" and "Morning" filters in your search.
What are the most popular departure times for flights from Washington, DC (DCA-Ronald Reagan Washington National) to Ontario, CA (ONT-Los Angeles - Ontario Intl.)?
The most popular departure times for flights from Ronald Reagan Washington National (DCA) to Ontario (ONT) are in the early morning, from 6am to 9am. About 33% of passengers prefer this time window. Many major carriers, including American Airlines and Southwest Airlines, offer flights during this window. This timing works well because it allows you to start your day in California after a short flight.
How long does it take to fly from Washington, DC (DCA-Ronald Reagan Washington National) to Ontario, CA (ONT-Los Angeles - Ontario Intl.)?
A flight from DCA to ONT with a layover takes around 7 hours 30 minutes, with the route covering approximately 2,259 miles. Keep in mind that actual flight times can vary due to wind patterns, weather, and air traffic.
Can you fly business or first class from Washington, DC (DCA-Ronald Reagan Washington National) to Ontario, CA (ONT-Los Angeles - Ontario Intl.)?
Select the "Business class" and "First class" filters when looking for DCA to ONT flights on Expedia. This is the easiest way to compare prices, routes and flight times for your trip.
How do I earn miles on a Washington, DC (DCA-Ronald Reagan Washington National) to Ontario, CA (ONT-Los Angeles - Ontario Intl.) flight with Expedia?
It's easy to earn miles on a Washington, DC (DCA-Ronald Reagan Washington National) to Ontario, CA (ONT-Los Angeles - Ontario Intl.) flight when you book with Expedia. Before you confirm your booking, simply select your frequent flyer program and enter your program number. As a member of One Key™, you can also earn OneKeyCash™* on top of your airline miles when you book with Expedia.*Excludes taxes and fees. OneKeyCash is not redeemable for cash and can only be used on Expedia and other participating brands.
What airports do you fly into for Ontario from Ronald Reagan Washington National (DCA)?
If you're planning to travel to Ontario from Ronald Reagan Washington National (DCA), you can fly into Los Angeles - Ontario Intl. (ONT) Some flights may connect through major hubs like O'Hare Intl. (ORD), Love Field (DAL), Midway Intl. (MDW) before reaching Ontario. Compare routes and airports on Expedia to find the best flight options for your travel plans.
Is it cheaper to buy a plane ticket from Washington, DC (DCA-Ronald Reagan Washington National) to Ontario, CA (ONT-Los Angeles - Ontario Intl.) at the last minute?
Typically, booking a last minute flight from Washington, DC (DCA-Ronald Reagan Washington National) to Ontario, CA (ONT-Los Angeles - Ontario Intl.) will be more expensive than booking in advance. As the departure date approaches, there are usually fewer seats available which can drive up the cost. However, if there's some wiggle room with your travel dates and times, you could bag a cheap last-minute fare.
Is it cheaper to book a Washington, DC (DCA-Ronald Reagan Washington National) to Ontario, CA (ONT-Los Angeles - Ontario Intl.) flight and hotel package?
Securing a Washington, DC (DCA-Ronald Reagan Washington National) to Ontario, CA (ONT-Los Angeles - Ontario Intl.) Los Angeles Vacation Packages is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Select from our extensive range of stays and then add flights, activities and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Washington, DC (DCA-Ronald Reagan Washington National) to Ontario, CA (ONT-Los Angeles - Ontario Intl.)?
If you booked your Washington, DC (DCA-Ronald Reagan Washington National) to Ontario, CA (ONT-Los Angeles - Ontario Intl.) flight within the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of ticket you have, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you'd like more information.

Travel information

Origin airport
Ronald Reagan Washington National
Destination airport
Ontario Intl. Airport
Airlines serving
Alaska Airlines, American Airlines, Delta, Frontier Airlines, Southwest Airlines, United
Roundtrip price
$158
Distance
2258 mi

Book with confidence

Washington to Ontario Intl. Airport Flights

The cheapest times to fly from Washington to Ontario Intl. Airport

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 Intl. Airport are during the month of October. You can find some of the cheapest flights from Washington to Ontario Intl. Airport with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Washington to Ontario Intl. Airport

Sunday is one of the best days to book for cheap flights from Washington to Ontario Intl. Airport: 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 Intl. Airport

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 Intl. Airport in 2026. You can also book with separate airlines for your outbound and return journeys, from $79 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 Intl. Airport 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 Intl. Airport 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 Intl. Airport Flights

*Flight schedules are subject to change.

*Available to One Key members.

 

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