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Cheap flights from Ontario to Washington, D.C. from $65

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 1/15. 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
12:04 pm - 9:59 pmONT-DCA
6h 55m1 stop
Frontier Logo
6:00 pm - 11:59 pmDCA-ONT
8h 59m1 stop
$230Frontier
Find Deal
qui, dez 4 - dom, jan 4
Frontier Logo
6:15 am - 1:06 pmONT-DCA
27h 51m2 stops
Frontier Logo
8:00 am - 2:25 pmDCA-ONT
9h 25m1 stop
$233Frontier
Find Deal
qua, dez 3 - seg, dez 8
Frontier Logo
7:00 am - 9:59 pmONT-DCA
11h 59m1 stop
Frontier Logo
2:00 pm - 11:59 pmDCA-ONT
12h 59m1 stop
$234Frontier
Find Deal
ter, jan 20 - qui, jan 22
Frontier Logo
7:00 am - 9:59 pmONT-DCA
11h 59m1 stop
Frontier Logo
6:00 pm - 11:59 pmDCA-ONT
8h 59m1 stop
$236Frontier
Find Deal
ter, fev 17 - sáb, fev 21
Frontier Logo
6:45 am - 9:59 pmONT-DCA
12h 14m1 stop
Frontier Logo
8:00 am - 11:59 pmDCA-ONT
18h 59m1 stop
$238Frontier
Find Deal
dom, dez 21 - qui, dez 25
Frontier Logo
5:18 pm - 1:06 pmONT-DCA
16h 48m2 stops
Frontier Logo
6:00 pm - 2:25 pmDCA-ONT
23h 25m1 stop
$241Frontier
Find Deal
sex, dez 5 - dom, dez 7
Frontier Logo
6:15 am - 9:59 pmONT-DCA
36h 44m2 stops
Frontier Logo
8:00 am - 2:25 pmDCA-ONT
9h 25m1 stop
$242Frontier
Find Deal
ter, dez 2 - seg, dez 8
Frontier Logo
12:58 am - 1:03 pmONT-DCA
9h 05m1 stop
Frontier Logo
8:00 am - 2:25 pmDCA-ONT
9h 25m1 stop
$246Frontier
Find Deal
sex, nov 28 - sáb, dez 6
Frontier Logo
3:20 pm - 1:06 pmONT-DCA
18h 46m1 stop
Frontier Logo
8:00 am - 11:59 pmDCA-ONT
18h 59m1 stop
$247Frontier
Find Deal
seg, dez 15 - qui, dez 18
Frontier Logo
12:58 am - 1:03 pmONT-DCA
9h 05m1 stop
Frontier Logo
6:00 pm - 11:09 amDCA-ONT
20h 09m1 stop
$249Frontier
Find Deal
qui, nov 27 - qua, dez 3

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
Nov 17
ONT4:05 pmOntario
21h 54m
1 stop
DCA4:59 pmWashington, D.C. Reagan-National
Nov 19
DCA8:15 amWashington, D.C. Reagan-National
16h 12m
1 stop
ONT9:27 pmOntario
$224
Find similar
Frontier
Nov 19
ONT8:45 amOntario
10h 14m
1 stop
DCA9:59 pmWashington, D.C. Reagan-National
Nov 25
DCA8:00 amWashington, D.C. Reagan-National
10h 26m
1 stop
ONT3:26 pmOntario
$229
Find similar
Frontier
Dec 4
ONT12:04 pmOntario
6h 55m
1 stop
DCA9:59 pmWashington, D.C. Reagan-National
Jan 4
DCA6:00 pmWashington, D.C. Reagan-National
8h 59m
1 stop
ONT11:59 pmOntario
$230
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
Dec 3
ONT10:25 pmOntario
7h 45m
1 stop
DCA9:10 amWashington, D.C. Reagan-National
Dec 8
DCA4:55 pmWashington, D.C. Reagan-National
21h 18m
1 stop
ONT11:13 amOntario
$313
Find similar
Delta
Nov 24
ONT12:16 pmOntario
7h 25m
1 stop
DCA10:41 pmWashington, D.C. Reagan-National
Dec 10
DCA6:00 amWashington, D.C. Reagan-National
8h 02m
1 stop
ONT11:02 amOntario
$319
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 novembro 13, 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

qui 12/4

12:04 pm-9:59 pm

1 stop6h 55m

Washington, D.C. Reagan-National

dom 1/4

6:00 pm-11:59 pm

1 stop8h 59m

$230

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

qua 12/3

6:15 am-1:06 pm

2 stops27h 51m

Washington, D.C. Reagan-National

seg 12/8

8:00 am-2:25 pm

1 stop9h 25m

$233

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

ter 1/20

7:00 am-9:59 pm

1 stop11h 59m

Washington, D.C. Reagan-National

qui 1/22

2:00 pm-11:59 pm

1 stop12h 59m

$234

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

ter 2/17

7:00 am-9:59 pm

1 stop11h 59m

Washington, D.C. Reagan-National

sáb 2/21

6:00 pm-11:59 pm

1 stop8h 59m

$236

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

dom 12/21

6:45 am-9:59 pm

1 stop12h 14m

Washington, D.C. Reagan-National

qui 12/25

8:00 am-11:59 pm

1 stop18h 59m

$238

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

sex 12/5

5:18 pm-1:06 pm

2 stops16h 48m

Washington, D.C. Reagan-National

dom 12/7

6:00 pm-2:25 pm

1 stop23h 25m

$241

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

ter 12/2

6:15 am-9:59 pm

2 stops36h 44m

Washington, D.C. Reagan-National

seg 12/8

8:00 am-2:25 pm

1 stop9h 25m

$242

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

sex 11/28

12:58 am-1:03 pm

1 stop9h 05m

Washington, D.C. Reagan-National

sáb 12/6

8:00 am-2:25 pm

1 stop9h 25m

$246

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

seg 12/15

3:20 pm-1:06 pm

1 stop18h 46m

Washington, D.C. Reagan-National

qui 12/18

8:00 am-11:59 pm

1 stop18h 59m

$247

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

qui 11/27

12:58 am-1:03 pm

1 stop9h 05m

Washington, D.C. Reagan-National

qua 12/3

6:00 pm-11:09 am

1 stop20h 09m

$249

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 $576. 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 $465.

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 $375 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 $316 on momondo.

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

As of November 2025, prices for Ontario to Washington, D.C. Reagan-National Airport flights are approximately 13% 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

Direct flights

None
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 36m.

  • 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
3,109 reviews
Search Frontier flights
United AirlinesPriceFrom $226Free CancellationRating
7.4
9,017 reviews
Search United Airlines flights
SouthwestPriceFrom $258Free CancellationRating
8.0
4,242 reviews
Search Southwest flights
DeltaPriceFrom $284Free CancellationRating
7.9
8,007 reviews
Search Delta flights
American AirlinesPriceFrom $326Free CancellationRating
7.2
11,051 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
Reston
Manassas
Gaithersburg
Fairfax
Glen Burnie
Linthicum Heights
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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