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Cheap flights from Ontario to Washington, D.C. from $125

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 11/1. 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. (ONT-DCA)

Cheap round-trip flights

Frontier Logo
8:59 pm - 12:10 pmONT-DCA
12h 11m1 stop
Frontier Logo
6:00 pm - 7:53 amDCA-ONT
16h 53m1 stop
$222Frontier
Find Deal
Sat, Sep 13 - Sun, Sep 14
Frontier Logo
6:53 am - 9:59 pmONT-DCA
12h 06m1 stop
Frontier Logo
1:00 pm - 11:50 pmDCA-ONT
13h 50m1 stop
$225Frontier
Find Deal
Wed, Oct 29 - Wed, Nov 5
Frontier Logo
8:59 pm - 12:10 pmONT-DCA
12h 11m1 stop
Frontier Logo
1:00 pm - 7:54 pmDCA-ONT
9h 54m1 stop
$227Frontier
Find Deal
Fri, Sep 19 - Fri, Sep 26
Frontier Logo
8:59 pm - 12:10 pmONT-DCA
12h 11m1 stop
Frontier Logo
1:00 pm - 7:54 pmDCA-ONT
9h 54m1 stop
$228Frontier
Find Deal
Tue, Sep 9 - Sat, Sep 13
Frontier Logo
8:59 pm - 9:59 pmONT-DCA
22h 00m1 stop
Frontier Logo
6:00 pm - 7:54 pmDCA-ONT
28h 54m1 stop
$230Frontier
Find Deal
Wed, Sep 10 - Fri, Sep 12
Frontier Logo
6:53 am - 12:04 pmONT-DCA
26h 11m1 stop
Frontier Logo
1:00 pm - 11:50 pmDCA-ONT
13h 50m1 stop
$232Frontier
Find Deal
Sun, Oct 26 - Mon, Nov 3
Frontier Logo
8:59 pm - 12:10 pmONT-DCA
12h 11m1 stop
Frontier Logo
1:00 pm - 7:54 pmDCA-ONT
9h 54m1 stop
$233Frontier
Find Deal
Sat, Sep 6 - Sat, Sep 20
Frontier Logo
8:59 pm - 12:10 pmONT-DCA
12h 11m1 stop
Frontier Logo
1:00 pm - 7:54 pmDCA-ONT
9h 54m1 stop
$235Frontier
Find Deal
Thu, Sep 11 - Mon, Sep 22
Delta Logo
11:36 am - 11:41 pmONT-DCA
9h 05m1 stop
Delta Logo
5:10 pm - 9:20 pmDCA-ONT
7h 10m1 stop
$285Delta
Find Deal
Wed, Oct 29 - Sat, Nov 8
Delta Logo
7:05 am - 6:33 pmONT-DCA
8h 28m1 stop
Delta Logo
11:10 am - 10:22 pmDCA-ONT
14h 12m2 stops
$290Delta
Find Deal
Tue, Oct 14 - Wed, Oct 15

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
Oct 29
ONT11:36 amOntario
9h 05m
1 stop
DCA11:41 pmWashington, D.C. Reagan-National
Nov 8
DCA5:10 pmWashington, D.C. Reagan-National
7h 10m
1 stop
ONT9:20 pmOntario
$285
Find similar
Delta
Oct 14
ONT7:05 amOntario
8h 28m
1 stop
DCA6:33 pmWashington, D.C. Reagan-National
Oct 15
DCA11:10 amWashington, D.C. Reagan-National
14h 12m
2 stops
ONT10:22 pmOntario
$290
Find similar
Delta
Oct 4
ONT7:05 amOntario
13h 36m
2 stops
DCA11:41 pmWashington, D.C. Reagan-National
Oct 8
DCA3:05 pmWashington, D.C. Reagan-National
10h 17m
2 stops
ONT10:22 pmOntario
$295
Find similar

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
Sep 13
ONT8:59 pmOntario
12h 11m
1 stop
DCA12:10 pmWashington, D.C. Reagan-National
Sep 14
DCA6:00 pmWashington, D.C. Reagan-National
16h 53m
1 stop
ONT7:53 amOntario
$222
Find similar
Frontier
Oct 29
ONT6:53 amOntario
12h 06m
1 stop
DCA9:59 pmWashington, D.C. Reagan-National
Nov 5
DCA1:00 pmWashington, D.C. Reagan-National
13h 50m
1 stop
ONT11:50 pmOntario
$225
Find similar
Frontier
Sep 19
ONT8:59 pmOntario
12h 11m
1 stop
DCA12:10 pmWashington, D.C. Reagan-National
Sep 26
DCA1:00 pmWashington, D.C. Reagan-National
9h 54m
1 stop
ONT7:54 pmOntario
$227
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 September 3, 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

Sat 9/13

8:59 pm-12:10 pm

1 stop12h 11m

Washington, D.C. Reagan-National

Sun 9/14

6:00 pm-7:53 am

1 stop16h 53m

$222

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Wed 10/29

6:53 am-9:59 pm

1 stop12h 06m

Washington, D.C. Reagan-National

Wed 11/5

1:00 pm-11:50 pm

1 stop13h 50m

$225

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Fri 9/19

8:59 pm-12:10 pm

1 stop12h 11m

Washington, D.C. Reagan-National

Fri 9/26

1:00 pm-7:54 pm

1 stop9h 54m

$227

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Tue 9/9

8:59 pm-12:10 pm

1 stop12h 11m

Washington, D.C. Reagan-National

Sat 9/13

1:00 pm-7:54 pm

1 stop9h 54m

$228

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Wed 9/10

8:59 pm-9:59 pm

1 stop22h 00m

Washington, D.C. Reagan-National

Fri 9/12

6:00 pm-7:54 pm

1 stop28h 54m

$230

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Sun 10/26

6:53 am-12:04 pm

1 stop26h 11m

Washington, D.C. Reagan-National

Mon 11/3

1:00 pm-11:50 pm

1 stop13h 50m

$232

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Sat 9/6

8:59 pm-12:10 pm

1 stop12h 11m

Washington, D.C. Reagan-National

Sat 9/20

1:00 pm-7:54 pm

1 stop9h 54m

$233

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Thu 9/11

8:59 pm-12:10 pm

1 stop12h 11m

Washington, D.C. Reagan-National

Mon 9/22

1:00 pm-7:54 pm

1 stop9h 54m

$235

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Wed 10/29

11:36 am-11:41 pm

1 stop9h 05m

Washington, D.C. Reagan-National

Sat 11/8

5:10 pm-9:20 pm

1 stop7h 10m

$285

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Tue 10/14

7:05 am-6:33 pm

1 stop8h 28m

Washington, D.C. Reagan-National

Wed 10/15

11:10 am-10:22 pm

2 stops14h 12m

$290

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

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 $316. 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 $405. Flights from Ontario to Washington, D.C. Reagan-National Airport on a Sunday will generally be more expensive and average around $585. 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 $380 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 $315 on momondo.

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

As of September 2025, prices for Ontario to Washington, D.C. Reagan-National Airport flights are approximately 33% 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

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.
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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 6h 55m.

  • 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
3,196 reviews
Search Frontier flights
United AirlinesPriceFrom $226Free CancellationRating
7.4
8,937 reviews
Search United Airlines flights
SouthwestPriceFrom $258Free CancellationRating
8.0
4,238 reviews
Search Southwest flights
DeltaPriceFrom $301Free CancellationRating
7.9
7,972 reviews
Search Delta flights
American AirlinesPriceFrom $316Free CancellationRating
7.2
10,000 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
Gettysburg
National Harbor
Arlington
Woodbridge
Waldorf
Tysons
Laurel
Silver Spring
Colonial Beach
Fredericksburg
Towson
Rockville
Manassas
Reston
Fairfax
Gaithersburg
Glen Burnie
Springfield
Linthicum Heights

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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