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Cheap flights from Ontario to Washington, D.C. from $67

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 2/3. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
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
6:20 am - 9:59 pm
ONT
-
DCA
12h 39m1 stop
Frontier Logo
8:59 am - 3:07 pm
DCA
-
ONT
9h 08m1 stop
$134Frontier
Thu, Jan 29 - Wed, Feb 4
Frontier Logo
8:36 am - 9:59 pm
ONT
-
DCA
10h 23m1 stop
Frontier Logo
6:00 pm - 11:59 pm
DCA
-
ONT
8h 59m1 stop
$139Frontier
Tue, Feb 10 - Sat, Feb 14
Multiple Airlines Logo
3:07 pm - 10:31 am
ONT
-
BWI
16h 24m2 stops
Multiple Airlines Logo
7:58 pm - 12:43 pm
BWI
-
ONT
19h 45m1 stop
$235Multiple Airlines
Tue, Feb 3 - Sun, Feb 8
United Airlines Logo
1:24 pm - 11:22 pm
ONT
-
IAD
6h 58m1 stop
United Airlines Logo
2:12 pm - 8:50 pm
IAD
-
ONT
9h 38m1 stop
$237United Airlines
Wed, Feb 11 - Wed, Feb 25
American Airlines Logo
9:59 am - 11:12 pm
ONT
-
IAD
10h 13m2 stops
American Airlines Logo
5:37 pm - 10:49 pm
IAD
-
ONT
8h 12m1 stop
$242American Airlines
Wed, Feb 11 - Wed, Feb 25
Southwest Logo
10:40 am - 11:40 pm
ONT
-
IAD
10h 00m1 stop
Southwest Logo
6:20 am - 10:15 am
IAD
-
ONT
6h 55m1 stop
$243Southwest
Tue, Apr 7 - Tue, Apr 14
Multiple Airlines Logo
2:06 pm - 9:25 am
ONT
-
IAD
16h 19m1 stop
Multiple Airlines Logo
6:37 pm - 6:22 pm
IAD
-
ONT
50h 45m2 stops
$244Multiple Airlines
Thu, Feb 12 - Mon, Feb 16
American Airlines Logo
9:59 am - 11:12 pm
ONT
-
IAD
10h 13m2 stops
American Airlines Logo
11:30 am - 10:19 pm
IAD
-
ONT
13h 49m2 stops
$248American Airlines
Wed, Feb 11 - Wed, Feb 25
Southwest Logo
5:55 am - 9:55 pm
ONT
-
IAD
13h 00m2 stops
Southwest Logo
9:05 am - 5:10 pm
IAD
-
ONT
11h 05m2 stops
$253Southwest
Wed, Feb 4 - Wed, Feb 11
United Airlines Logo
1:24 pm - 11:15 pm
ONT
-
BWI
6h 51m1 stop
United Airlines Logo
4:09 pm - 8:50 pm
BWI
-
ONT
7h 41m1 stop
$257United Airlines
Wed, Feb 11 - Wed, Feb 25

Delta flights from Ontario to Washington, D.C.

Our best Delta deals on Ontario to Washington, D.C. flight tickets
Delta
Jan 28
ONT12:41 pmOntario
8h 43m
1 stop
IAD12:24 amWashington, D.C. Dulles Intl
Feb 4
IAD3:42 pmWashington, D.C. Dulles Intl
8h 23m
1 stop
ONT9:05 pmOntario
$257
Delta
Jan 28
ONT12:41 pmOntario
8h 43m
1 stop
IAD12:24 amWashington, D.C. Dulles Intl
Feb 4
IAD12:23 pmWashington, D.C. Dulles Intl
11h 42m
2 stops
ONT9:05 pmOntario
$262
Delta
Mar 18
ONT1:20 pmOntario
7h 20m
1 stop
IAD11:40 pmWashington, D.C. Dulles Intl
Mar 23
IAD7:00 amWashington, D.C. Dulles Intl
13h 13m
1 stop
ONT5:13 pmOntario
$272

United Airlines flights from Ontario to Washington, D.C.

Our best United Airlines deals on Ontario to Washington, D.C. flight tickets
United Airlines
Feb 11
ONT1:24 pmOntario
6h 58m
1 stop
IAD11:22 pmWashington, D.C. Dulles Intl
Feb 25
IAD2:12 pmWashington, D.C. Dulles Intl
9h 38m
1 stop
ONT8:50 pmOntario
$237
United Airlines
Feb 11
ONT1:24 pmOntario
6h 51m
1 stop
BWI11:15 pmBaltimore/Washington
Feb 25
BWI4:09 pmBaltimore/Washington
7h 41m
1 stop
ONT8:50 pmOntario
$257
United Airlines
Feb 11
ONT1:24 pmOntario
6h 51m
1 stop
BWI11:15 pmBaltimore/Washington
Feb 25
BWI10:30 amBaltimore/Washington
15h 27m
2 stops
ONT10:57 pmOntario
$262

momondo Fare Finder

 
Customize your flight search to find flights from Ontario to Washington, D.C. 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 January 8, 2026.
Use the filters below to find and compare flights from Ontario to Washington, D.C. that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Thu 1/29

6:20 am-9:59 pm

1 stop12h 39m

Washington, D.C. Reagan-National

Wed 2/4

8:59 am-3:07 pm

1 stop9h 08m

$134

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Tue 2/10

8:36 am-9:59 pm

1 stop10h 23m

Washington, D.C. Reagan-National

Sat 2/14

6:00 pm-11:59 pm

1 stop8h 59m

$139

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Tue 2/3

3:07 pm-10:31 am

2 stops16h 24m

Baltimore/Washington

Sun 2/8

7:58 pm-12:43 pm

1 stop19h 45m

$235

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Wed 2/11

1:24 pm-11:22 pm

1 stop6h 58m

Washington, D.C. Dulles Intl

Wed 2/25

2:12 pm-8:50 pm

1 stop9h 38m

$237

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Wed 2/11

9:59 am-11:12 pm

2 stops10h 13m

Washington, D.C. Dulles Intl

Wed 2/25

5:37 pm-10:49 pm

1 stop8h 12m

$242

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Tue 4/7

10:40 am-11:40 pm

1 stop10h 00m

Washington, D.C. Dulles Intl

Tue 4/14

6:20 am-10:15 am

1 stop6h 55m

$243

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Thu 2/12

2:06 pm-9:25 am

1 stop16h 19m

Washington, D.C. Dulles Intl

Mon 2/16

6:37 pm-6:22 pm

2 stops50h 45m

$244

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Wed 2/11

9:59 am-11:12 pm

2 stops10h 13m

Washington, D.C. Dulles Intl

Wed 2/25

11:30 am-10:19 pm

2 stops13h 49m

$248

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Wed 2/4

5:55 am-9:55 pm

2 stops13h 00m

Washington, D.C. Dulles Intl

Wed 2/11

9:05 am-5:10 pm

2 stops11h 05m

$253

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Wed 2/11

1:24 pm-11:15 pm

1 stop6h 51m

Baltimore/Washington

Wed 2/25

4:09 pm-8:50 pm

1 stop7h 41m

$257

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.

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.?

What is the cheapest month to fly to Washington, D.C.?

The month of September is, on average, the cheapest month to fly to Washington, D.C. from Ontario, with most prices found around $226. If you’re not able to fly to Washington, D.C. in September, then January is your next best option. Flight prices from Ontario to Washington, D.C. during January average around $227.

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

On average, the least expensive day to fly to Washington, D.C. from Ontario is on a Wednesday. momondo users have found tickets for Wednesday departures for as low as $412. However, this price may fluctuate depending on the airline, the season, and holidays. When flying out on a Sunday, the most expensive travel day of the week, you can expect to see flight prices from Ontario to Washington, D.C. for around $560.

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

In the afternoon is the cheapest time of day to fly from Ontario to Washington, D.C. when you can find flight prices for as low as $383. Flying to Washington, D.C. in the afternoon is an ideal time because this is during off-peak travel hours. Try not to purchase tickets at noon because they tend to be around $467. Of course, these prices can vary depending on the time of year and what airport you fly to.

What is the cheapest Ontario to Washington, D.C. flight route?

Fly from Ontario to Baltimore/Washington for the best Ontario - Washington, D.C. flight prices

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

You are more likely to see cheaper flights to Washington, D.C. from Ontario when booking weeks ahead of your departure date. In general, you can expect to find flights to Washington, D.C. for around $444 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Washington, D.C. from Ontario for as low as $297 on momondo.

What cabin class options are available on Ontario to Washington, D.C. flights?

There is only 1 cabin class available to choose from on Ontario to Washington, D.C. flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on Ontario to Washington, D.C. flights?

You could potentially save up to 44% on your flight if you consider stops on a Ontario to Washington, D.C. flight.

How have Ontario to Washington, D.C. flight prices changed over time?

As of January 2026, prices for Ontario to Washington, D.C. flights are approximately 63% more expensive when compared to flights at the same time last year.

When to book flights from Ontario to Washington, D.C.

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

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

Best Price Found

$238

Fastest flight time

4h 40m

Direct flights

Mon, Tue, Thu, Fri, Sat and Sun

Airports in Washington, D.C.

2 airports
The best one-way flight to Washington, D.C. from Ontario in the past 72 hours is $238. The best round-trip flight deal from Ontario to Washington, D.C. found on momondo in the last 72 hours is $406.
The fastest flight from Ontario to Washington, D.C. takes 4h 40m
Direct flights go from Ontario to Washington, D.C. on Monday, Tuesday, Thursday, Friday, Saturday and Sunday. There are no airlines offering direct flights.
There are 2 airports in Washington, D.C.. From Ontario there are direct flights to Baltimore/Washington (BWI).
Search flight deals

  • How far is Ontario to Washington, D.C. by plane?

    Ontario and Washington, D.C. are 2260.6 mi apart from one another. In terms of flight time, this usually takes a little over 4h 40m.

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

    Prices for flights from Ontario Airport to Washington, D.C. are refreshed on a daily basis.

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

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

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, 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..

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

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

  • What is the most popular plane model from Ontario to Washington, D.C.?

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

Best airlines flying from Ontario to Washington, D.C.

Compare and see reviews for airlines that fly from Ontario to Washington, D.C. with momondo
Airline
Rating
Free Cancellation
Price
Spirit AirlinesPriceFrom $98Free CancellationRating
6.3
8,287 reviews
Search Spirit Airlines flights
FrontierPriceFrom $147Free CancellationRating
5.7
3,061 reviews
Search Frontier flights
United AirlinesPriceFrom $226Free CancellationRating
7.4
9,139 reviews
Search United Airlines flights
SouthwestPriceFrom $258Free CancellationRating
8.0
4,250 reviews
Search Southwest flights
DeltaPriceFrom $276Free CancellationRating
7.9
8,027 reviews
Search Delta flights
American AirlinesPriceFrom $278Free CancellationRating
7.2
11,097 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
Tysons
Laurel
Colonial Beach
Silver Spring
Towson
Fredericksburg
Rockville
Gaithersburg
Manassas
Fairfax
Springfield
Glen Burnie
Linthicum Heights
Reston

Why use momondo?

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

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Ontario to Washington, D.C.. momondo saves you time and could save you money on your trip.

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

Yes. momondo allows you to filter the results for Ontario to Washington, D.C. flights to just show those with flexible booking policies.

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

momondo helps you find the best flight between Ontario and Washington, D.C. by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

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

Yes. momondo can track prices for Ontario to Washington, D.C. flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

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Find better results for your trip to the United States

Fly into one of these airports located in Washington, D.C.

Airports listed have a maximum distance of 22.4 mi from Washington, D.C.
Washington, D.C. Reagan-National Airport
Washington, D.C. Dulles Intl Airport