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Cheap flights from Ontario to Washington, D.C. from $62

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 1/14. 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

Enter your travel dates to find the best prices.
Frontier Logo
7:15 am - 9:59 pm
ONT
-
DCA
11h 44m1 stop
Frontier Logo
2:00 pm - 11:59 pm
DCA
-
ONT
12h 59m1 stop
$251Frontier
Wed, Jan 14 - Fri, Jan 16
Frontier Logo
6:00 am - 9:59 pm
ONT
-
DCA
12h 59m1 stop
Frontier Logo
2:00 pm - 11:56 pm
DCA
-
ONT
12h 56m1 stop
$252Frontier
Fri, Jan 9 - Sun, Jan 11
Frontier Logo
6:00 am - 4:59 pm
ONT
-
DCA
7h 59m1 stop
Frontier Logo
6:00 pm - 11:56 pm
DCA
-
ONT
8h 56m1 stop
$253Frontier
Fri, Jan 9 - Sun, Jan 11
Frontier Logo
6:10 am - 4:59 pm
ONT
-
DCA
7h 49m1 stop
Frontier Logo
2:00 pm - 11:59 pm
DCA
-
ONT
12h 59m1 stop
$254Frontier
Fri, Jan 16 - Mon, Jan 19
Frontier Logo
6:00 pm - 1:02 pm
ONT
-
DCA
16h 02m2 stops
Frontier Logo
8:59 am - 11:14 pm
DCA
-
ONT
17h 15m1 stop
$257Frontier
Mon, Jan 5 - Wed, Jan 7
Frontier Logo
6:00 am - 9:59 pm
ONT
-
DCA
12h 59m1 stop
Frontier Logo
8:00 am - 7:14 pm
DCA
-
ONT
14h 14m2 stops
$267Frontier
Sat, Feb 21 - Sat, Feb 28
Frontier Logo
6:45 am - 1:01 pm
ONT
-
DCA
27h 16m1 stop
Frontier Logo
8:01 am - 11:56 pm
DCA
-
ONT
18h 55m1 stop
$268Frontier
Thu, Jan 1 - Sun, Jan 11
Frontier Logo
6:00 am - 9:59 pm
ONT
-
DCA
12h 59m1 stop
Frontier Logo
6:00 pm - 11:59 pm
DCA
-
ONT
8h 59m1 stop
$272Frontier
Fri, Feb 20 - Sun, Feb 22
Frontier Logo
6:00 am - 1:01 pm
ONT
-
DCA
28h 01m1 stop
Frontier Logo
8:00 am - 7:07 am
DCA
-
ONT
26h 07m2 stops
$273Frontier
Fri, Jan 9 - Wed, Jan 14
Frontier Logo
6:20 am - 9:59 pm
ONT
-
DCA
12h 39m1 stop
Frontier Logo
6:00 pm - 1:37 pm
DCA
-
ONT
22h 37m2 stops
$274Frontier
Fri, Jan 23 - Mon, Jan 26

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
Jan 16
ONT6:10 amOntario
27h 52m
1 stop
DCA1:02 pmWashington, D.C. Reagan-National
Jan 20
DCA6:00 pmWashington, D.C. Reagan-National
24h 07m
1 stop
ONT3:07 pmOntario
$146
Find similar
Frontier
Jan 10
ONT7:00 amOntario
11h 59m
1 stop
DCA9:59 pmWashington, D.C. Reagan-National
Jan 21
DCA8:59 amWashington, D.C. Reagan-National
9h 08m
1 stop
ONT3:07 pmOntario
$165
Find similar
Frontier
Jan 7
ONT7:00 amOntario
11h 59m
1 stop
DCA9:59 pmWashington, D.C. Reagan-National
Jan 10
DCA6:00 pmWashington, D.C. Reagan-National
8h 14m
1 stop
ONT11:14 pmOntario
$178
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Ontario to Washington, D.C. Reagan-National Airport that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated December 16, 2025.
Use the filters below to find and compare flights from Ontario to Washington, D.C. Reagan-National Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Wed 1/14

7:15 am-9:59 pm

1 stop11h 44m

Washington, D.C. Reagan-National

Fri 1/16

2:00 pm-11:59 pm

1 stop12h 59m

$251

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Fri 1/9

6:00 am-9:59 pm

1 stop12h 59m

Washington, D.C. Reagan-National

Sun 1/11

2:00 pm-11:56 pm

1 stop12h 56m

$252

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Fri 1/9

6:00 am-4:59 pm

1 stop7h 59m

Washington, D.C. Reagan-National

Sun 1/11

6:00 pm-11:56 pm

1 stop8h 56m

$253

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Fri 1/16

6:10 am-4:59 pm

1 stop7h 49m

Washington, D.C. Reagan-National

Mon 1/19

2:00 pm-11:59 pm

1 stop12h 59m

$254

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Mon 1/5

6:00 pm-1:02 pm

2 stops16h 02m

Washington, D.C. Reagan-National

Wed 1/7

8:59 am-11:14 pm

1 stop17h 15m

$257

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Sat 2/21

6:00 am-9:59 pm

1 stop12h 59m

Washington, D.C. Reagan-National

Sat 2/28

8:00 am-7:14 pm

2 stops14h 14m

$267

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Thu 1/1

6:45 am-1:01 pm

1 stop27h 16m

Washington, D.C. Reagan-National

Sun 1/11

8:01 am-11:56 pm

1 stop18h 55m

$268

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Fri 2/20

6:00 am-9:59 pm

1 stop12h 59m

Washington, D.C. Reagan-National

Sun 2/22

6:00 pm-11:59 pm

1 stop8h 59m

$272

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Fri 1/9

6:00 am-1:01 pm

1 stop28h 01m

Washington, D.C. Reagan-National

Wed 1/14

8:00 am-7:07 am

2 stops26h 07m

$273

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Fri 1/23

6:20 am-9:59 pm

1 stop12h 39m

Washington, D.C. Reagan-National

Mon 1/26

6:00 pm-1:37 pm

2 stops22h 37m

$274

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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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 September is, on average, the cheapest month to fly to Washington, D.C. Reagan-National Airport from Ontario, with most prices found around $293. If you aren’t able to travel to Washington, D.C. Reagan-National Airport during the month of September, then flying in February 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 $402. Flights from Ontario to Washington, D.C. Reagan-National Airport on a Sunday will generally be more expensive and average around $548. 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 $461.

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 $377 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 $311 on momondo.

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

As of December 2025, prices for Ontario to Washington, D.C. Reagan-National Airport flights are approximately 80% more expensive 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

Fastest flight time

6h 44m

Direct flights

None
The fastest flight from Ontario to Washington, D.C. Reagan-National Airport takes 6h 44m
There are no direct flights from Ontario to Washington, D.C. Reagan-National Airport. There are no popular flight routes from Ontario to Washington, D.C. Reagan-National Airport.
Search flight deals

  • 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 6h 44m.

  • 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
5.8
3,082 reviews
Search Frontier flights
United AirlinesPriceFrom $226Free CancellationRating
7.4
9,092 reviews
Search United Airlines flights
SouthwestPriceFrom $258Free CancellationRating
7.9
4,250 reviews
Search Southwest flights
DeltaPriceFrom $276Free CancellationRating
7.9
8,008 reviews
Search Delta flights
American AirlinesPriceFrom $326Free CancellationRating
7.2
11,049 reviews
Search American 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
National Harbor
Gettysburg
Arlington
Woodbridge
Waldorf
Tysons
Laurel
Colonial Beach
Silver Spring
Fredericksburg
Towson
Rockville
Gaithersburg
Reston
Manassas
Fairfax
Glen Burnie
Linthicum Heights
Bethesda

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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