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Cheap flights from Ontario to Washington, D.C. from $75

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 5/3. 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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0 bags

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Find the cheapest flights from Ontario to Washington, D.C.

Cheap round-trip flights

KAYAK's recommended round-trip deals from the most popular airlines that fly from Ontario to Washington, D.C..
Frontier Logo
12:59 am - 12:07 pmONT-DCA
8h 08m1 stop
Frontier Logo
6:00 pm - 11:59 pmDCA-ONT
8h 59m1 stop
$174Frontier
Find Deal
Fri, May 9 - Sat, May 17
Frontier Logo
12:59 am - 12:07 pmONT-DCA
8h 08m1 stop
Frontier Logo
6:00 pm - 11:59 pmDCA-ONT
8h 59m1 stop
$177Frontier
Find Deal
Fri, May 16 - Sat, May 17
Delta Logo
10:00 pm - 9:08 amONT-DCA
8h 08m1 stop
Delta Logo
5:15 pm - 11:42 pmDCA-ONT
9h 27m1 stop
$327Delta
Find Deal
Fri, May 30 - Wed, Jun 4
Delta Logo
2:55 pm - 5:52 amONT-IAD
11h 57m1 stop
Delta Logo
7:45 am - 2:15 pmIAD-ONT
9h 30m1 stop
$327Delta
Find Deal
Tue, May 27 - Thu, Jun 5
American Airlines Logo
7:30 am - 12:02 amONT-IAD
13h 32m2 stops
American Airlines Logo
5:02 am - 1:52 pmIAD-ONT
11h 50m2 stops
$337American Airlines
Find Deal
Tue, May 20 - Sun, May 25
Southwest Logo
9:20 pm - 5:10 amONT-BWI
4h 50mnonstop
Southwest Logo
8:55 pm - 11:15 pmBWI-ONT
5h 20mnonstop
$337Southwest
Find Deal
Fri, Jun 6 - Sat, Jun 14
Southwest Logo
9:20 pm - 5:10 amONT-BWI
4h 50mnonstop
Southwest Logo
4:15 pm - 6:35 pmBWI-ONT
5h 20mnonstop
$345Southwest
Find Deal
Sat, Jun 28 - Fri, Jul 4
American Airlines Logo
8:04 pm - 8:36 amONT-BWI
9h 32m2 stops
American Airlines Logo
2:10 pm - 9:56 pmBWI-ONT
10h 46m2 stops
$367American Airlines
Find Deal
Fri, Sep 5 - Mon, Sep 8
United Airlines Logo
6:32 pm - 5:15 amONT-IAD
7h 43m1 stop
United Airlines Logo
5:18 pm - 10:26 pmIAD-ONT
8h 08m1 stop
$374United Airlines
Find Deal
Mon, Jun 16 - Sat, Jun 21
United Airlines Logo
6:48 pm - 5:23 amONT-IAD
7h 35m1 stop
United Airlines Logo
6:30 am - 12:14 pmIAD-ONT
8h 44m1 stop
$377United Airlines
Find Deal
Mon, May 19 - Thu, May 22

American Airlines flights from Ontario to Washington, D.C.

Our best American Airlines deals on Ontario to Washington, D.C. flight tickets
American Airlines
May 20
ONT7:30 amOntario
13h 32m
2 stops
IAD12:02 amWashington, D.C. Dulles Intl
May 25
IAD5:02 amWashington, D.C. Dulles Intl
11h 50m
2 stops
ONT1:52 pmOntario
American Airlines
Sep 5
ONT8:04 pmOntario
9h 32m
2 stops
BWI8:36 amBaltimore/Washington
Sep 8
BWI2:10 pmBaltimore/Washington
10h 46m
2 stops
ONT9:56 pmOntario
American Airlines
May 29
ONT10:00 amOntario
11h 02m
2 stops
IAD12:02 amWashington, D.C. Dulles Intl
Jun 1
IAD6:17 amWashington, D.C. Dulles Intl
8h 33m
1 stop
ONT11:50 amOntario

United Airlines flights from Ontario to Washington, D.C.

Our best United Airlines deals on Ontario to Washington, D.C. flight tickets
United Airlines
Jun 16
ONT6:32 pmOntario
7h 43m
1 stop
IAD5:15 amWashington, D.C. Dulles Intl
Jun 21
IAD5:18 pmWashington, D.C. Dulles Intl
8h 08m
1 stop
ONT10:26 pmOntario
United Airlines
May 19
ONT6:48 pmOntario
7h 35m
1 stop
IAD5:23 amWashington, D.C. Dulles Intl
May 22
IAD6:30 amWashington, D.C. Dulles Intl
8h 44m
1 stop
ONT12:14 pmOntario
United Airlines
May 14
ONT3:10 pmOntario
11h 13m
2 stops
BWI5:23 amBaltimore/Washington
May 18
BWI6:35 amBaltimore/Washington
8h 49m
1 stop
ONT12:24 pmOntario

See travel insights to Washington, D.C. from

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 typical price of a round-trip flight between Ontario and Washington, D.C.?

What is the cheapest month to fly to Washington, D.C.?

The month of August is, on average, the cheapest month to fly to Washington, D.C. from Ontario, with most prices found around $271. If you’re not able to fly to Washington, D.C. in August, then April is your next best option. Flight prices from Ontario to Washington, D.C. during April average around $292.

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 $425. 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 $586.

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 $377. 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 at noon because they tend to be around $487. 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 22 weeks ahead of your departure date. In general, you can expect to find flights to Washington, D.C. for around $455 when searching 22 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 $289 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.

How have Ontario to Washington, D.C. flight prices changed over time?

As of April 2025, prices for Ontario to Washington, D.C. flights are approximately 2% cheaper when compared to flights at the same time last year.

When to book flights from Ontario to Washington, D.C.

Are you open to changing your travel dates? Check out the ideal times to fly from Ontario to Washington, D.C. according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

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

$75

Fastest flight time

4h 50m

Direct flights

Mon, Tue, Wed, Fri, Sat and Sun

Airports in Washington, D.C.

3 airports
The best one-way flight to Washington, D.C. from Ontario in the past 72 hours is $75. The best round-trip flight deal from Ontario to Washington, D.C. found on momondo in the last 72 hours is $174.
The fastest flight from Ontario to Washington, D.C. takes 4h 50m
Direct flights go from Ontario to Washington, D.C. on Monday, Tuesday, Wednesday, Friday, Saturday and Sunday. The only airline offering direct flights is Southwest.
There are 3 airports near Washington, D.C.: Washington, D.C. Reagan-National (DCA), Baltimore/Washington (BWI), Washington, D.C. Dulles Intl (IAD)

  • 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.?

  • 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.?

  • What is the most popular airline from Ontario to Washington, D.C.?


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
Spirit AirlinesPriceFrom $130Free CancellationRating
6.3
7,940 reviews
Search Spirit Airlines flights
FrontierPriceFrom $145Free CancellationRating
5.9
3,283 reviews
Search Frontier flights
United AirlinesPriceFrom $256Free CancellationRating
7.4
8,685 reviews
Search United Airlines flights
DeltaPriceFrom $286Free CancellationRating
8.0
7,920 reviews
Search Delta flights
American AirlinesPriceFrom $286Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
SouthwestPriceFrom $326Free CancellationRating
8.0
4,287 reviews
Search Southwest flights

Traveling to a place near Washington, D.C.?

Book flights to Washington, D.C. if you plan to visit one of these locations
Alexandria
Arlington
Gettysburg
National Harbor
Laurel
Silver Spring
Woodbridge
Tysons
Fredericksburg
Waldorf
Manassas
Gaithersburg
Rockville
Glen Burnie
Towson
Linthicum Heights
Fairfax
Reston
Springfield
Hyattsville

Why 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.


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Mon 4/28
Mon 5/5

Find better results for your trip to the United States

Fly into one of these airports located in Washington, D.C.

Airports listed have a maximum distance of 22.4 mi from Washington, D.C.