Cheap flights from Ontario to Washington, D.C. from $133
This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Ontario to Washington, D.C. departing on 9/19. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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United Airlines flights from Ontario to Washington, D.C.
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Southwest flights from Ontario to Washington, D.C.
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How to get the cheapest flight ticket from Ontario to Washington, D.C.
Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip
What is the cheapest month to fly to Washington, D.C.?
The month of May is, on average, the cheapest month to fly to Washington, D.C. from Ontario, with most prices found around $228. If you’re not able to fly to Washington, D.C. in May, then August is your next best option. Flight prices from Ontario to Washington, D.C. during August average around $275.
What is the cheapest day to depart on your flight to Washington, D.C.?
On average, the least expensive day to fly to Washington, D.C. from Ontario is on a Wednesday. momondo users have found tickets for Wednesday departures for as low as $415. However, this price may fluctuate depending on the airline, the season, and holidays. When flying out on a Sunday, the most expensive travel day of the week, you can expect to see flight prices from Ontario to Washington, D.C. for around $571.
What is the cheapest time of day to depart on your flight to Washington, D.C.?
In the afternoon is the cheapest time of day to fly from Ontario to Washington, D.C. when you can find flight prices for as low as $371. Flying to Washington, D.C. in the afternoon is an ideal time because this is during off-peak travel hours. Try not to purchase tickets in the evening because they tend to be around $472. Of course, these prices can vary depending on the time of year and what airport you fly to.
What is the cheapest Ontario to Washington, D.C. flight route?
Fly from Ontario to Baltimore/Washington for the best Ontario - Washington, D.C. flight prices
How far in advance should I book a flight to Washington, D.C.?
You are more likely to see cheaper flights to Washington, D.C. from Ontario when booking 4 weeks ahead of your departure date. In general, you can expect to find flights to Washington, D.C. for around $434 when searching 4 weeks out.However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Washington, D.C. from Ontario for as low as $302 on momondo.
What cabin class options are available on Ontario to Washington, D.C. flights?
There are 1 cabin classes available to choose from on Ontario to Washington, D.C. flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.
Can stopping save me money on Ontario to Washington, D.C. flights?
You could potentially save up to 50% on your flight if you consider stops on a Ontario to Washington, D.C. flight.
How have Ontario to Washington, D.C. flight prices changed over time?
As of June 2025, prices for Ontario to Washington, D.C. flights are approximately 3% more expensive when compared to flights at the same time last year.
What is the cheapest airline that flies from Ontario to Washington, D.C.?
Frontier, Hawaiian Airlines, and Alaska Airlines are the most popular carriers operating from Ontario to Washington, D.C.
What airlines fly to Washington, D.C.?
United Airlines, American Airlines and Spirit Airlines are the top three most popular airlines that fly to Washington, D.C. from Ontario according to our data. United Airlines is the first choice among our users, with 42% of people opting to fly with this airline when traveling to Washington, D.C.. Keep in mind that there are 9 different airlines that fly to Washington, D.C. on a routine basis, so you have a few additional options to choose from.
How many flights depart from Ontario to Washington, D.C. on average per day?
As of June 2025, there are 1 flights per day flying from Ontario to Washington, D.C.. The most common time of day flights depart is 9:00PM, with 100% of flights taking off in the evening.
How many flights depart from Ontario to Washington, D.C. on average per week?
As of June 2025, 12 flights take off from Ontario and land in Washington, D.C. each week. The most common flight departure day for this route is Mon, with 17% of weekly flights taking off on this day.
When to book flights from Ontario to Washington, D.C.
Cheap Ontario to Washington, D.C. (ONT to WAS) flight deals and tips
Find info about flight duration, direct flights, and airports for your flight from Ontario to Washington, D.C.
Best Price Found | $133 |
|---|---|
Fastest flight time | 4h 50m |
Direct flights | Every day |
Airports in Washington, D.C. | 3 airports |
How far is Ontario to Washington, D.C. by plane?
Ontario and Washington, D.C. are 2260.6 mi apart from one another. In terms of flight time, this usually takes a little over 4h 50m.
When did momondo last update prices for flights from Ontario Airport to Washington, D.C.?
Prices for flights from Ontario Airport to Washington, D.C. are refreshed on a daily basis.
How many operators does momondo search for flights from Ontario Airport to Washington, D.C.?
There are 6 operators available for flights from Ontario Airport to Washington, D.C. as of June 2025.
How old do you have to be to fly from Ontario Airport to Washington, D.C.?
Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Ontario Airport to Washington, D.C..
What documentation or ID do you need to fly to Washington, D.C.?
The required travel and health documents for your Washington, D.C. trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Washington, D.C.. We recommend that you seek guidance from your airline or a reliable third party such as IATA.
What is the most popular plane model from Ontario to Washington, D.C.?
momondo data reveals that the most frequently booked plane model on the route from Ontario to Washington, D.C. is Boeing 737 MAX 8, representing 19.02% of all bookings. The subsequent popular models are Boeing 737-800 Passenger/BBJ2 (winglets) at 15.61%, Boeing 737 MAX 9 at 13.66%, and Airbus A320neo at 7.32%.
What is the most popular airline from Ontario to Washington, D.C.?
Based on momondo bookings for flights between Ontario and Washington, D.C., the leading airline is Frontier, making up 43% of the total bookings. Other popular airlines include Southwest with 20%, American Airlines with 19%, and Delta with 12%.
Best airlines flying from Ontario to Washington, D.C.
Compare and see reviews for airlines that fly from Ontario to Washington, D.C. with momondo
| Airline | Rating | Free Cancellation | Price | ||
|---|---|---|---|---|---|
| PriceFrom $130 | Free Cancellation | Rating 6.3 8,052 reviews | |||
| PriceFrom $141 | Free Cancellation | Rating 5.9 3,295 reviews | |||
| PriceFrom $256 | Free Cancellation | Rating 7.4 8,790 reviews | |||
| PriceFrom $286 | Free Cancellation | Rating 8.0 7,946 reviews | |||
| PriceFrom $286 | Free Cancellation | Rating 7.2 10,000 reviews | |||
| PriceFrom $326 | Free Cancellation | Rating 8.0 4,287 reviews |
United Airlines Flights From Ontario to Washington, D.C.
The lowest priced United Airlines flight from Ontario to Washington, D.C. from the last 72 hours was $256. Generally, United Airlines has 5 flights on this route every week with an average price of $456. United Airlines is rated 7.4/10 by our users.
Traveling to a place near Washington, D.C.?
Book flights to Washington, D.C. if you plan to visit one of these locationsWhy use momondo?
Why should I use momondo to find a flight deal from Ontario to Washington, D.C.?
momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Ontario to Washington, D.C.. momondo saves you time and could save you money on your trip.
Can I find flights from Ontario to Washington, D.C. with flexible booking policies on momondo?
Yes. momondo allows you to filter the results for Ontario to Washington, D.C. flights to just show those with flexible booking policies.
How can momondo help me find flights from Ontario to Washington, D.C.?
momondo helps you find the best flight between Ontario and Washington, D.C. by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.
I’m not ready to book a flight from Ontario to Washington, D.C. right now. Can momondo alert me if prices change?
Yes. momondo can track prices for Ontario to Washington, D.C. flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.