$126 Cheap Flights from Ontario Intl. Airport (ONT) to Washington (DCA)

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

Explore a range of airlines offering flights from Ontario (ONT) to Washington (DCA) on this domestic long-haul journey. Whether you're searching for the cheapest flights from Ontario or prefer to book flights from Ontario to Washington with a full-service carrier, you’ll find options that fit your budget and schedule. Get ready to discover Washington's iconic landmarks and vibrant neighborhoods as you plan your next flight from Ontario International Airport (ONT) to Ronald Reagan Washington National Airport (DCA).

• Fastest (typical) flight duration: around 5h 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 $90–$450, depending on seasonality and how far ahead you book

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

Based on the latest traveler bookings, here are the top airlines flying from Ontario to Washington, favored for one-stop and multi-stop journeys. Popular layovers are often at Denver International Airport (DEN), with a layover of about 2 hours and 15 minutes, Dallas-Fort Worth International Airport (DFW) at approximately 1 hour and 15 minutes, and Sky Harbor International Airport (PHX) with a layover of around 1 hour and 45 minutes. These options allow you to tailor your travel experience by balancing price, total travel time, and cabin class for the ideal itinerary.

• American Airlines: This full-service airline provides one-stop travel with one-way fares generally between $150 and $510. It represents about 37% of departures on this route, featuring a flight duration of 5 hours and 45 minutes, totaling around 7 hours and 15 minutes with a layover.
• Frontier Airlines: Known as a budget-friendly option, this carrier also offers one-stop service, with one-way prices usually ranging from $90 to $245. Frontier accounts for roughly 22% of departures on this route, maintaining an in-flight time of 5 hours and 45 minutes, culminating in a total travel time of about 7 hours and 15 minutes.
• Southwest Airlines: As a low-cost carrier, Southwest provides both one-stop and multi-stop options, with one-way fares typically falling between $140 and $480. It captures around 14% of departures, featuring an in-flight duration of 5 hours and 45 minutes and a total journey time of approximately 7 hours and 15 minutes.
• United: Another full-service airline, United offers one-stop service with one-way fares ranging from $135 to $540. This carrier accounts for about 14% of departures on this route, with an in-flight time of 5 hours and 45 minutes and a complete travel duration of roughly 7 hours and 15 minutes, including layovers.
• Delta: Delta, a full-service airline, provides one-stop service with one-way fares usually between $140 and $495. It represents around 14% of departures on this route, featuring a flight time of 5 hours and 45 minutes and a total journey time of about 7 hours and 15 minutes, including layovers.

Travelers flying from Ontario to Washington can enhance their journey by upgrading their service. American Airlines offers first-class seating, while Delta provides both first-class and premium economy options. United also features a first-class cabin for a more comfortable experience.

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

The most popular months for travelers flying from Ontario to Washington are March, April, and May, when peak temperatures in Washington reach up to 65.7°F in May. If you prefer quieter travel, consider September, the least busy and relatively cheaper time to visit with fewer crowds and temperatures around 71.1°F. For better deals, May usually offers the lowest average one-way fare around $208. Flight availability peaks in May, with approximately 25 flights per week, making it easier to find convenient departure times. February has the fewest flights, with approximately 15 flights per week.

• Cheapest time to fly: May usually offers good deals with average one-way fare around $208, roughly 14% cheaper than the yearly average.
• More budget-friendly months to fly: August and July typically offer average one-way fares of around $220.
• Most flight options: May has the highest number of flights from Ontario to Washington, with approximately 25 flights per week, giving you more flexibility in scheduling your trip.

*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 Ontario (ONT) to Washington (DCA)

• Ontario to Washington (ONT-IAD): Washington Dulles International Airport (IAD) lies approximately 23 miles from Ronald Reagan Washington National Airport (DCA). On this route, one-way economy fares generally range from $135 to $465, influenced by the season and booking timing. Travelers can choose between one-stop and multi-stop flights, with frequent layover cities including Dallas-Fort Worth International Airport (DFW) and Denver International Airport (DEN). American Airlines and United are among the leading carriers for this route. Additionally, first class service is offered.
• Orange County to Washington (SNA-DCA): John Wayne Airport (SNA) is located roughly 31 miles from Los Angeles - Ontario International Airport (ONT). Economy tickets for this journey typically fall between $90 and $505, varying with the season and how far in advance you book. Passengers can select from both one-stop and multi-stop flights, with common layover points at Denver International Airport (DEN) and O'Hare International Airport (ORD). American Airlines and low-cost Frontier Airlines are popular choices for this route. First class service is also available here.

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

Getting some of the best deals on flights from Ontario to Washington 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 often found when booking 2-8 weeks in advance, which aligns with the typical booking habits of most travelers. Early morning departures (12 am-5 am) usually offer lower prices, while morning flights (5 am-12 pm) are the most popular. Additionally, flying on Tuesday tends to be cheaper, although Thursday remains the most favored 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 Ronald Reagan Washington National Airport from Los Angeles - Ontario International Airport

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

• Hotel transfer: Transfers offer a convenient way to reach your hotel in Washington, with private rides that can be arranged in advance.
• Car rental: Renting a car from Ronald Reagan Washington National Airport is a great option if you plan to explore and sightsee beyond the city. Browse cheap car rentals at Ronald Reagan Washington National 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 Ronald Reagan Washington National Airport, travelers will find National Airport Station, a metro station, located just 0.2 miles away on foot, while Alexandria Station, a train station, is about 3.8 miles from the airport and typically reached by car. Additionally, Washington Seaport, a seaport, is situated approximately 4.8 miles away by car.

Ontario Intl. Airport to Washington Flights

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

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

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

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

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 Ontario Intl. Airport to Washington in 2026. You can also book with separate airlines for your outbound and return journeys, from $126 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 Ontario Intl. Airport to Washington 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 Ontario Intl. Airport to Washington 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.