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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 9/11. 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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Find the cheapest flights from Ontario to Washington, D.C. (ONT-WAS)

Cheap round-trip flights

Frontier Logo
8:59 pm - 5:42 pmONT-BWI
17h 43m1 stop
Frontier Logo
6:27 pm - 7:54 pmBWI-ONT
28h 27m1 stop
$164Frontier
Find Deal
Thu, Sep 11 - Mon, Sep 15
Frontier Logo
8:59 pm - 5:42 pmONT-BWI
17h 43m1 stop
Frontier Logo
12:53 pm - 6:15 pmBWI-ONT
8h 22m1 stop
$165Frontier
Find Deal
Thu, Sep 25 - Sun, Sep 28
Delta Logo
10:00 pm - 9:13 amONT-BWI
8h 13m1 stop
Delta Logo
7:15 am - 12:14 pmBWI-ONT
7h 59m1 stop
$296Delta
Find Deal
Tue, Oct 7 - Sat, Oct 11
American Airlines Logo
10:29 pm - 11:00 amONT-DCA
9h 31m1 stop
American Airlines Logo
3:25 pm - 9:36 pmDCA-ONT
9h 11m1 stop
$297American Airlines
Find Deal
Tue, Oct 14 - Wed, Oct 15
Delta Logo
11:48 am - 12:40 amONT-IAD
9h 52m1 stop
Delta Logo
7:35 am - 5:10 pmIAD-ONT
12h 35m1 stop
$297Delta
Find Deal
Tue, Oct 14 - Wed, Oct 15
American Airlines Logo
10:35 pm - 10:13 amONT-BWI
8h 38m1 stop
American Airlines Logo
6:41 am - 11:57 amBWI-ONT
8h 16m1 stop
$303American Airlines
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Thu, Sep 25 - Tue, Sep 30
United Airlines Logo
1:53 pm - 12:45 amONT-IAD
7h 52m1 stop
United Airlines Logo
4:10 pm - 10:51 pmIAD-ONT
9h 41m1 stop
$333United Airlines
Find Deal
Wed, Oct 22 - Mon, Oct 27
United Airlines Logo
7:00 am - 6:22 pmONT-IAD
8h 22m1 stop
United Airlines Logo
6:30 am - 12:17 pmIAD-ONT
8h 47m1 stop
$336United Airlines
Find Deal
Thu, Nov 27 - Thu, Dec 4
Southwest Logo
5:25 am - 7:00 pmONT-IAD
10h 35m2 stops
Southwest Logo
4:40 pm - 8:55 pmIAD-ONT
7h 15m1 stop
$353Southwest
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Thu, Nov 13 - Mon, Nov 17
Southwest Logo
1:25 pm - 10:50 pmONT-IAD
6h 25m1 stop
Southwest Logo
7:35 am - 12:40 pmIAD-ONT
8h 05m2 stops
$358Southwest
Find Deal
Fri, Sep 26 - Mon, Sep 29

Delta flights from Ontario to Washington, D.C.

Our best Delta deals on Ontario to Washington, D.C. flight tickets
Delta
Oct 7
ONT10:00 pmOntario
8h 13m
1 stop
BWI9:13 amBaltimore/Washington
Oct 11
BWI7:15 amBaltimore/Washington
7h 59m
1 stop
ONT12:14 pmOntario
$296
Find similar
Delta
Oct 14
ONT11:48 amOntario
9h 52m
1 stop
IAD12:40 amWashington, D.C. Dulles Intl
Oct 15
IAD7:35 amWashington, D.C. Dulles Intl
12h 35m
1 stop
ONT5:10 pmOntario
$297
Find similar
Delta
Sep 24
ONT10:00 pmOntario
8h 09m
1 stop
IAD9:09 amWashington, D.C. Dulles Intl
Oct 1
IAD6:00 amWashington, D.C. Dulles Intl
9h 17m
2 stops
ONT12:17 pmOntario
$302
Find similar

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

Our best Alaska Airlines deals on Ontario to Washington, D.C. flight tickets
Alaska Airlines
Nov 13
ONT4:11 pmOntario
11h 12m
1 stop
IAD6:23 amWashington, D.C. Dulles Intl
Nov 16
IAD7:43 amWashington, D.C. Dulles Intl
10h 34m
1 stop
ONT3:17 pmOntario
$309
Find similar
Alaska Airlines
Nov 18
ONT4:11 pmOntario
11h 12m
1 stop
IAD6:23 amWashington, D.C. Dulles Intl
Nov 24
IAD6:34 pmWashington, D.C. Dulles Intl
9h 27m
1 stop
ONT1:01 amOntario
$311
Find similar
Alaska Airlines
Nov 5
ONT4:11 pmOntario
11h 12m
1 stop
IAD6:23 amWashington, D.C. Dulles Intl
Nov 8
IAD7:43 amWashington, D.C. Dulles Intl
10h 34m
1 stop
ONT3:17 pmOntario
$316
Find similar

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 August 26, 2025.
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

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Thu 9/11

8:59 pm-5:42 pm

1 stop17h 43m

Baltimore/Washington

Mon 9/15

6:27 pm-7:54 pm

1 stop28h 27m

$164

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Thu 9/25

8:59 pm-5:42 pm

1 stop17h 43m

Baltimore/Washington

Sun 9/28

12:53 pm-6:15 pm

1 stop8h 22m

$165

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Tue 10/7

10:00 pm-9:13 am

1 stop8h 13m

Baltimore/Washington

Sat 10/11

7:15 am-12:14 pm

1 stop7h 59m

$296

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Tue 10/14

10:29 pm-11:00 am

1 stop9h 31m

Washington, D.C. Reagan-National

Wed 10/15

3:25 pm-9:36 pm

1 stop9h 11m

$297

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Tue 10/14

11:48 am-12:40 am

1 stop9h 52m

Washington, D.C. Dulles Intl

Wed 10/15

7:35 am-5:10 pm

1 stop12h 35m

$297

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Thu 9/25

10:35 pm-10:13 am

1 stop8h 38m

Baltimore/Washington

Tue 9/30

6:41 am-11:57 am

1 stop8h 16m

$303

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Wed 10/22

1:53 pm-12:45 am

1 stop7h 52m

Washington, D.C. Dulles Intl

Mon 10/27

4:10 pm-10:51 pm

1 stop9h 41m

$333

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Thu 11/27

7:00 am-6:22 pm

1 stop8h 22m

Washington, D.C. Dulles Intl

Thu 12/4

6:30 am-12:17 pm

1 stop8h 47m

$336

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Thu 11/13

5:25 am-7:00 pm

2 stops10h 35m

Washington, D.C. Dulles Intl

Mon 11/17

4:40 pm-8:55 pm

1 stop7h 15m

$353

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Fri 9/26

1:25 pm-10:50 pm

1 stop6h 25m

Washington, D.C. Dulles Intl

Mon 9/29

7:35 am-12:40 pm

2 stops8h 05m

$358

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 cheapest month to fly to Washington, D.C.?

The month of May is, on average, the cheapest month to fly to Washington, D.C. from Ontario, with most prices found around $228. If you’re not able to fly to Washington, D.C. in May, then August is your next best option. Flight prices from Ontario to Washington, D.C. during August average around $262.

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 $426. 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 $578.

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 $379. 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 in the evening because they tend to be around $482. 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 24% 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 August 2025, prices for Ontario to Washington, D.C. flights are approximately 8% cheaper 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

$203

Fastest flight time

4h 45m

Direct flights

Every day

Airports in Washington, D.C.

1 airport
The best one-way flight to Washington, D.C. from Ontario in the past 72 hours is $203. The best round-trip flight deal from Ontario to Washington, D.C. found on momondo in the last 72 hours is $361.
The fastest flight from Ontario to Washington, D.C. takes 4h 45m
Direct flights go from Ontario to Washington, D.C. every day.
There is 1 airport near Washington, D.C.: 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 6h 15m.

  • 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
8,031 reviews
Search Spirit Airlines flights
FrontierPriceFrom $147Free CancellationRating
5.8
3,200 reviews
Search Frontier flights
United AirlinesPriceFrom $226Free CancellationRating
7.4
8,943 reviews
Search United Airlines flights
SouthwestPriceFrom $258Free CancellationRating
8.0
4,242 reviews
Search Southwest flights
DeltaPriceFrom $286Free CancellationRating
7.9
7,979 reviews
Search Delta flights
American AirlinesPriceFrom $286Free 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
Arlington
National Harbor
Woodbridge
Waldorf
Tysons
Laurel
Silver Spring
Colonial Beach
Fredericksburg
Towson
Manassas
Rockville
Gaithersburg
Reston
Fairfax
Glen Burnie
Springfield
Linthicum Heights

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