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Cheap flights from Ontario to Washington, D.C. from $99

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 5/2. 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
12:59 am - 4:59 pm
ONT
-
DCA
13h 00m
1 stop
Frontier Logo
6:00 pm - 11:55 pm
DCA
-
ONT
8h 55m
1 stop
$200Frontier
Tue, Apr 14 - Tue, Apr 21
Frontier Logo
12:59 am - 4:59 pm
ONT
-
DCA
13h 00m
1 stop
Frontier Logo
1:59 pm - 7:31 am
DCA
-
ONT
20h 32m
1 stop
$201Frontier
Mon, Apr 13 - Thu, Apr 16
Frontier Logo
12:59 am - 9:59 pm
ONT
-
DCA
18h 00m
1 stop
Frontier Logo
6:00 pm - 11:55 pm
DCA
-
ONT
8h 55m
1 stop
$202Frontier
Thu, Apr 16 - Fri, May 1
Frontier Logo
12:59 am - 1:00 pm
ONT
-
DCA
9h 01m
1 stop
Frontier Logo
1:59 pm - 7:31 am
DCA
-
ONT
20h 32m
1 stop
$207Frontier
Mon, Apr 13 - Thu, Apr 16
Frontier Logo
8:40 am - 9:59 pm
ONT
-
DCA
10h 19m
1 stop
Frontier Logo
6:00 pm - 11:59 pm
DCA
-
ONT
8h 59m
1 stop
$209Frontier
Wed, Mar 4 - Mon, Mar 9
Frontier Logo
5:33 pm - 9:59 pm
ONT
-
DCA
25h 26m
1 stop
Frontier Logo
7:00 am - 7:31 am
DCA
-
ONT
27h 31m
1 stop
$211Frontier
Thu, Apr 23 - Sun, Apr 26
Frontier Logo
12:59 am - 1:00 pm
ONT
-
DCA
9h 01m
1 stop
Frontier Logo
1:59 pm - 11:55 pm
DCA
-
ONT
12h 56m
1 stop
$221Frontier
Sun, Apr 19 - Thu, Apr 23
Frontier Logo
5:33 pm - 1:00 pm
ONT
-
DCA
16h 27m
1 stop
Frontier Logo
1:59 pm - 11:55 pm
DCA
-
ONT
12h 56m
1 stop
$223Frontier
Fri, Apr 17 - Sun, Apr 19
Frontier Logo
5:33 pm - 1:00 pm
ONT
-
DCA
16h 27m
1 stop
Frontier Logo
6:00 pm - 11:55 pm
DCA
-
ONT
8h 55m
1 stop
$228Frontier
Fri, Apr 17 - Sun, Apr 19
Frontier Logo
6:20 am - 12:02 pm
ONT
-
DCA
26h 42m
1 stop
Frontier Logo
1:00 pm - 11:56 pm
DCA
-
ONT
13h 56m
1 stop
$232Frontier
Fri, Apr 10 - Mon, Apr 13

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
Mar 3
ONT8:40 amOntario
25h 35m
1 stop
DCA1:15 pmWashington, D.C. Reagan-National
Mar 10
DCA8:00 amWashington, D.C. Reagan-National
18h 59m
1 stop
ONT11:59 pmOntario
$200
Frontier
Apr 13
ONT12:59 amOntario
13h 00m
1 stop
DCA4:59 pmWashington, D.C. Reagan-National
Apr 16
DCA1:59 pmWashington, D.C. Reagan-National
20h 32m
1 stop
ONT7:31 amOntario
$201
Frontier
Apr 16
ONT12:59 amOntario
18h 00m
1 stop
DCA9:59 pmWashington, D.C. Reagan-National
May 1
DCA6:00 pmWashington, D.C. Reagan-National
8h 55m
1 stop
ONT11:55 pmOntario
$202

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 February 19, 2026.
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

Tue 4/14

12:59 am-4:59 pm

1 stop13h 00m

Washington, D.C. Reagan-National

Tue 4/21

6:00 pm-11:55 pm

1 stop8h 55m

$200

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Mon 4/13

12:59 am-4:59 pm

1 stop13h 00m

Washington, D.C. Reagan-National

Thu 4/16

1:59 pm-7:31 am

1 stop20h 32m

$201

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Thu 4/16

12:59 am-9:59 pm

1 stop18h 00m

Washington, D.C. Reagan-National

Fri 5/1

6:00 pm-11:55 pm

1 stop8h 55m

$202

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Mon 4/13

12:59 am-1:00 pm

1 stop9h 01m

Washington, D.C. Reagan-National

Thu 4/16

1:59 pm-7:31 am

1 stop20h 32m

$207

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Wed 3/4

8:40 am-9:59 pm

1 stop10h 19m

Washington, D.C. Reagan-National

Mon 3/9

6:00 pm-11:59 pm

1 stop8h 59m

$209

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Thu 4/23

5:33 pm-9:59 pm

1 stop25h 26m

Washington, D.C. Reagan-National

Sun 4/26

7:00 am-7:31 am

1 stop27h 31m

$211

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Sun 4/19

12:59 am-1:00 pm

1 stop9h 01m

Washington, D.C. Reagan-National

Thu 4/23

1:59 pm-11:55 pm

1 stop12h 56m

$221

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Fri 4/17

5:33 pm-1:00 pm

1 stop16h 27m

Washington, D.C. Reagan-National

Sun 4/19

1:59 pm-11:55 pm

1 stop12h 56m

$223

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Fri 4/17

5:33 pm-1:00 pm

1 stop16h 27m

Washington, D.C. Reagan-National

Sun 4/19

6:00 pm-11:55 pm

1 stop8h 55m

$228

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Fri 4/10

6:20 am-12:02 pm

1 stop26h 42m

Washington, D.C. Reagan-National

Mon 4/13

1:00 pm-11:56 pm

1 stop13h 56m

$232

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 January is, on average, the cheapest month to fly to Washington, D.C. Reagan-National Airport from Ontario, with most prices found around $265. If you aren’t able to travel to Washington, D.C. Reagan-National Airport during the month of January, then flying in September is also cheap. Prices for this month can be found on momondo for an average of $293.

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 $551. 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 at noon. Our users have found flights to Washington, D.C. Reagan-National Airport at noon for as low as $403. 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 $456.

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 $353 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 $317 on momondo.

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

As of February 2026, prices for Ontario to Washington, D.C. Reagan-National Airport flights are approximately 10% 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

Fastest flight time

7h 07m

Direct flights

None
The fastest flight from Ontario to Washington, D.C. Reagan-National Airport takes 7h 07m
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 7h 07m.

  • 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
5.7
3,048 reviews
Search Frontier flights
DeltaPriceFrom $208Free CancellationRating
7.9
8,213 reviews
Search Delta flights
United AirlinesPriceFrom $226Free CancellationRating
7.4
9,322 reviews
Search United Airlines flights
SouthwestPriceFrom $258Free CancellationRating
8.0
4,295 reviews
Search Southwest flights
American AirlinesPriceFrom $318Free CancellationRating
7.2
11,313 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
Waldorf
Woodbridge
Colonial Beach
Laurel
Silver Spring
Tysons
Towson
Fredericksburg
Gaithersburg
Rockville
Manassas
Springfield
Fairfax
Bethesda
Linthicum Heights
College Park

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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