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Cheap flights from Ontario to Washington, D.C. from $148

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 8/14. 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

Frontier Logo
12:59 am - 12:11 pmONT-DCA
8h 12m1 stop
Frontier Logo
1:00 pm - 7:54 pmDCA-ONT
9h 54m1 stop
$275Frontier
Find Deal
Fri, Aug 22 - Sat, Sep 6
Frontier Logo
12:59 am - 12:04 pmONT-DCA
8h 05m1 stop
Frontier Logo
6:00 pm - 11:50 pmDCA-ONT
8h 50m1 stop
$278Frontier
Find Deal
Mon, Aug 4 - Mon, Aug 11
Frontier Logo
12:59 am - 4:59 pmONT-DCA
13h 00m1 stop
Frontier Logo
6:00 pm - 11:50 pmDCA-ONT
8h 50m1 stop
$281Frontier
Find Deal
Fri, Aug 29 - Sun, Aug 31
Frontier Logo
12:59 am - 4:59 pmONT-DCA
13h 00m1 stop
Frontier Logo
7:00 am - 7:54 pmDCA-ONT
15h 54m1 stop
$282Frontier
Find Deal
Mon, Aug 25 - Tue, Sep 9
Frontier Logo
5:21 pm - 12:04 pmONT-DCA
15h 43m1 stop
Frontier Logo
1:00 pm - 11:50 pmDCA-ONT
13h 50m1 stop
$285Frontier
Find Deal
Mon, Aug 11 - Sat, Aug 16
Frontier Logo
12:59 am - 12:04 pmONT-DCA
8h 05m1 stop
Frontier Logo
6:00 pm - 11:50 pmDCA-ONT
8h 50m1 stop
$287Frontier
Find Deal
Mon, Aug 4 - Wed, Aug 13
American Airlines Logo
12:22 pm - 7:00 amONT-DCA
15h 38m1 stop
American Airlines Logo
3:28 pm - 9:24 pmDCA-ONT
8h 56m1 stop
$326American Airlines
Find Deal
Sat, Aug 30 - Mon, Sep 15
Delta Logo
10:05 pm - 9:09 amONT-DCA
8h 04m1 stop
Delta Logo
6:00 am - 10:42 amDCA-ONT
7h 42m1 stop
$327Delta
Find Deal
Thu, Aug 7 - Sun, Sep 28
Delta Logo
11:45 am - 11:46 pmONT-DCA
9h 01m1 stop
Delta Logo
4:05 pm - 10:43 pmDCA-ONT
9h 38m2 stops
$332Delta
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Fri, Sep 5 - Sat, Sep 13
Southwest Logo
6:20 am - 6:40 pmONT-DCA
9h 20m2 stops
Southwest Logo
4:40 pm - 10:00 pmDCA-ONT
8h 20m2 stops
$337Southwest
Find Deal
Thu, Aug 21 - Mon, Aug 25

Frontier flights from Ontario to Washington, D.C. Reagan-National Airport

Our best Frontier deals on Ontario to Washington, D.C. Reagan-National Airport flight tickets
Frontier
Aug 22
ONT12:59 amOntario
8h 12m
1 stop
DCA12:11 pmWashington, D.C. Reagan-National
Sep 6
DCA1:00 pmWashington, D.C. Reagan-National
9h 54m
1 stop
ONT7:54 pmOntario
$275
Find similar
Frontier
Aug 4
ONT12:59 amOntario
8h 05m
1 stop
DCA12:04 pmWashington, D.C. Reagan-National
Aug 11
DCA6:00 pmWashington, D.C. Reagan-National
8h 50m
1 stop
ONT11:50 pmOntario
$278
Find similar
Frontier
Aug 29
ONT12:59 amOntario
13h 00m
1 stop
DCA4:59 pmWashington, D.C. Reagan-National
Aug 31
DCA6:00 pmWashington, D.C. Reagan-National
8h 50m
1 stop
ONT11:50 pmOntario
$281
Find similar

Delta flights from Ontario to Washington, D.C. Reagan-National Airport

Our best Delta deals on Ontario to Washington, D.C. Reagan-National Airport flight tickets
Delta
Aug 7
ONT10:05 pmOntario
8h 04m
1 stop
DCA9:09 amWashington, D.C. Reagan-National
Sep 28
DCA6:00 amWashington, D.C. Reagan-National
7h 42m
1 stop
ONT10:42 amOntario
$327
Find similar
Delta
Sep 5
ONT11:45 amOntario
9h 01m
1 stop
DCA11:46 pmWashington, D.C. Reagan-National
Sep 13
DCA4:05 pmWashington, D.C. Reagan-National
9h 38m
2 stops
ONT10:43 pmOntario
$332
Find similar

See travel insights to Washington, D.C. from

How to get the cheapest flight ticket from Ontario to Washington, D.C. Reagan-National Airport

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. Reagan-National Airport?

The month of February is, on average, the cheapest month to fly to Washington, D.C. Reagan-National Airport from Ontario, with most prices found around $326. If you aren’t able to travel to Washington, D.C. Reagan-National Airport during the month of February, then flying in September is also cheap. Prices for this month can be found on momondo for an average of $326.

What is the cheapest day to depart on your flight to Washington, D.C. Reagan-National Airport?

The cheapest day to depart from Ontario to Washington, D.C. Reagan-National Airport is on a Wednesday. Travelers who choose to depart for Washington, D.C. Reagan-National Airport on a Wednesday will often find tickets for as low as $399. Flights from Ontario to Washington, D.C. Reagan-National Airport on a Sunday will generally be more expensive and average around $587. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

What is the cheapest time of day to depart on your flight to Washington, D.C. Reagan-National Airport?

Our data shows that the cheapest Ontario to Washington, D.C. Reagan-National Airport flights are usually those with departure times in the afternoon. Our users have found flights to Washington, D.C. Reagan-National Airport in the afternoon for as low as $188. In contrast, the most expensive time of day to depart to Washington, D.C. Reagan-National Airport is in the morning when prices are around $464.

How far in advance should I book a flight to Washington, D.C. Reagan-National Airport?

You are more likely to see cheaper flights to Washington, D.C. Reagan-National Airport from Ontario when booking weeks ahead of your departure date. In general, you can expect to find flights to Washington, D.C. Reagan-National Airport for around $389 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Washington, D.C. Reagan-National Airport from Ontario for as low as $323 on momondo.

How have Ontario to Washington, D.C. Reagan-National Airport flight prices changed over time?

As of July 2025, prices for Ontario to Washington, D.C. Reagan-National Airport flights are approximately 37% cheaper when compared to flights at the same time last year.

When to book flights from Ontario to Washington, D.C. Reagan-National Airport

Are you open to changing your travel dates? Check out the ideal times to fly from Ontario to Washington, D.C. Reagan-National Airport 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. Reagan-National Airport (ONT to DCA) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Ontario to Washington, D.C. Reagan-National Airport

Best Price Found

$148

Fastest flight time

6h 56m

Direct flights

None
The best one-way flight to Washington, D.C. Reagan-National Airport from Ontario in the past 72 hours is $148. The best round-trip flight deal from Ontario to Washington, D.C. Reagan-National Airport found on momondo in the last 72 hours is $275.
The fastest flight from Ontario to Washington, D.C. Reagan-National Airport takes 6h 56m
There are no direct flights from Ontario to Washington, D.C. Reagan-National Airport. Popular non-direct route for this connection is Ontario Airport - Washington, D.C. Reagan-National Airport.
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  • How far is Ontario to Washington, D.C. Reagan-National by plane?

    The distance between Ontario and Washington, D.C. Reagan-National is about 2260.8 mi. A reasonable flight in good conditions will take 8h 04m.

  • When did momondo last update prices for flights from Ontario Airport to Washington, D.C. Reagan-National Airport?

    Prices for flights from Ontario Airport to Washington, D.C. Reagan-National Airport were last updated today.

  • How many operators does momondo search for flights from Ontario Airport to Washington, D.C. Reagan-National Airport?

  • How old do you have to be to fly from Ontario Airport to Washington, D.C. Reagan-National Airport?

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, 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. Reagan-National Airport.

  • What documentation or ID do you need to fly to Washington, D.C. Reagan-National Airport?

    The required travel and health documents for your Washington, D.C. Reagan-National Airport 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. Reagan-National Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

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

Best airlines flying from Ontario to Washington, D.C. Reagan-National Airport

Compare and see reviews for airlines that fly from Ontario to Washington, D.C. Reagan-National Airport with momondo
Airline
Rating
Free Cancellation
Price
FrontierPriceFrom $147Free CancellationRating
5.9
3,251 reviews
Search Frontier flights
SouthwestPriceFrom $258Free CancellationRating
8.0
4,238 reviews
Search Southwest flights
DeltaPriceFrom $286Free CancellationRating
8.0
7,958 reviews
Search Delta flights
American AirlinesPriceFrom $316Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
United AirlinesPriceFrom $322Free CancellationRating
7.4
8,864 reviews
Search United Airlines 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
Gettysburg
Arlington
National Harbor
Laurel
Woodbridge
Silver Spring
Tysons
Waldorf
Fredericksburg
Manassas
Gaithersburg
Rockville
Towson
Fairfax
Colonial Beach
Glen Burnie
Linthicum Heights
Reston
Springfield

Why use momondo?

Why should I use momondo to find a flight deal from Ontario to Washington, D.C.?

It is quick and easy to find Ontario to Washington, D.C. flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Washington, D.C. that suits you.

Can I find flights from Ontario to Washington, D.C. with flexible booking policies on momondo?

All flight searches from Ontario to Washington, D.C. on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from Ontario to Washington, D.C.?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Ontario to Washington, D.C..

I’m not ready to book a flight from Ontario to Washington, D.C. right now. Can momondo alert me if prices change?

If you are simply researching potential flights to Washington, D.C., momondo offers a useful price alert feature which will track prices for flights to Washington, D.C. from Ontario and alert you when they change.

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