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Cheap flights from Ontario to Washington, D.C. from $105

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 11/4. 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. (ONT-WAS)

Cheap round-trip flights

Southwest Logo
8:05 am - 6:45 pmONT-DCA
7h 40m1 stop
Southwest Logo
6:00 am - 10:35 amDCA-ONT
7h 35m1 stop
$210Southwest
Find Deal
Sat, Nov 1 - Wed, Nov 5
American Airlines Logo
2:54 pm - 1:00 amONT-DCA
7h 06m1 stop
American Airlines Logo
6:45 am - 1:54 pmDCA-ONT
10h 09m1 stop
$211American Airlines
Find Deal
Wed, Sep 3 - Sat, Sep 6
American Airlines Logo
6:10 am - 4:47 pmONT-IAD
7h 37m1 stop
American Airlines Logo
6:04 am - 11:54 amIAD-ONT
8h 50m1 stop
$211American Airlines
Find Deal
Sat, Nov 1 - Tue, Nov 4
Southwest Logo
1:25 pm - 10:50 pmONT-IAD
6h 25m1 stop
Southwest Logo
7:00 am - 11:00 amIAD-ONT
7h 00m1 stop
$212Southwest
Find Deal
Thu, Sep 4 - Sat, Sep 6
United Airlines Logo
6:36 pm - 5:36 amONT-IAD
8h 00m1 stop
United Airlines Logo
3:25 pm - 10:45 pmIAD-ONT
10h 20m1 stop
$249United Airlines
Find Deal
Wed, Oct 22 - Thu, Oct 30
United Airlines Logo
7:00 am - 9:36 pmONT-DCA
11h 36m2 stops
United Airlines Logo
6:00 pm - 10:30 pmDCA-ONT
7h 30m1 stop
$254United Airlines
Find Deal
Wed, Sep 3 - Sat, Sep 6
Frontier Logo
12:59 am - 12:11 pmONT-DCA
8h 12m1 stop
Frontier Logo
6:00 pm - 11:50 pmDCA-ONT
8h 50m1 stop
$255Frontier
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Tue, Aug 19 - Tue, Sep 2
Frontier Logo
12:59 am - 12:04 pmONT-DCA
8h 05m1 stop
Frontier Logo
6:00 pm - 11:50 pmDCA-ONT
8h 50m1 stop
$257Frontier
Find Deal
Fri, Aug 15 - Mon, Aug 18
Delta Logo
11:45 am - 9:48 pmONT-DCA
7h 03m1 stop
Delta Logo
6:00 am - 10:35 amDCA-ONT
7h 35m1 stop
$277Delta
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Mon, Aug 25 - Wed, Aug 27
Delta Logo
1:15 pm - 11:32 pmONT-IAD
7h 17m1 stop
Delta Logo
6:00 am - 10:42 amIAD-ONT
7h 42m1 stop
$277Delta
Find Deal
Sat, Aug 30 - Wed, Sep 17

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

Our best Alaska Airlines deals on Ontario to Washington, D.C. flight tickets
Alaska Airlines
Sep 11
ONT7:40 pmOntario
8h 53m
1 stop
IAD7:33 amWashington, D.C. Dulles Intl
Sep 17
IAD7:00 amWashington, D.C. Dulles Intl
10h 12m
1 stop
ONT2:12 pmOntario
$231
Find similar
Alaska Airlines
Sep 4
ONT7:40 pmOntario
8h 53m
1 stop
IAD7:33 amWashington, D.C. Dulles Intl
Sep 10
IAD7:00 amWashington, D.C. Dulles Intl
10h 12m
1 stop
ONT2:12 pmOntario
$234
Find similar
Alaska Airlines
Sep 8
ONT7:47 pmOntario
8h 46m
1 stop
IAD7:33 amWashington, D.C. Dulles Intl
Sep 11
IAD7:00 amWashington, D.C. Dulles Intl
10h 12m
1 stop
ONT2:12 pmOntario
$248
Find similar

Southwest flights from Ontario to Washington, D.C.

Our best Southwest deals on Ontario to Washington, D.C. flight tickets
Southwest
Nov 1
ONT8:05 amOntario
7h 40m
1 stop
DCA6:45 pmWashington, D.C. Reagan-National
Nov 5
DCA6:00 amWashington, D.C. Reagan-National
7h 35m
1 stop
ONT10:35 amOntario
$210
Find similar
Southwest
Sep 4
ONT1:25 pmOntario
6h 25m
1 stop
IAD10:50 pmWashington, D.C. Dulles Intl
Sep 6
IAD7:00 amWashington, D.C. Dulles Intl
7h 00m
1 stop
ONT11:00 amOntario
$212
Find similar
Southwest
Nov 1
ONT8:05 amOntario
9h 15m
1 stop
DCA8:20 pmWashington, D.C. Reagan-National
Nov 5
DCA11:15 amWashington, D.C. Reagan-National
10h 00m
2 stops
ONT6:15 pmOntario
$228
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 5, 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

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Sat 11/1

8:05 am-6:45 pm

1 stop7h 40m

Washington, D.C. Reagan-National

Wed 11/5

6:00 am-10:35 am

1 stop7h 35m

$210

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Wed 9/3

2:54 pm-1:00 am

1 stop7h 06m

Washington, D.C. Reagan-National

Sat 9/6

6:45 am-1:54 pm

1 stop10h 09m

$211

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Sat 11/1

6:10 am-4:47 pm

1 stop7h 37m

Washington, D.C. Dulles Intl

Tue 11/4

6:04 am-11:54 am

1 stop8h 50m

$211

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Thu 9/4

1:25 pm-10:50 pm

1 stop6h 25m

Washington, D.C. Dulles Intl

Sat 9/6

7:00 am-11:00 am

1 stop7h 00m

$212

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Wed 10/22

6:36 pm-5:36 am

1 stop8h 00m

Washington, D.C. Dulles Intl

Thu 10/30

3:25 pm-10:45 pm

1 stop10h 20m

$249

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Wed 9/3

7:00 am-9:36 pm

2 stops11h 36m

Washington, D.C. Reagan-National

Sat 9/6

6:00 pm-10:30 pm

1 stop7h 30m

$254

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Tue 8/19

12:59 am-12:11 pm

1 stop8h 12m

Washington, D.C. Reagan-National

Tue 9/2

6:00 pm-11:50 pm

1 stop8h 50m

$255

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Fri 8/15

12:59 am-12:04 pm

1 stop8h 05m

Washington, D.C. Reagan-National

Mon 8/18

6:00 pm-11:50 pm

1 stop8h 50m

$257

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Mon 8/25

11:45 am-9:48 pm

1 stop7h 03m

Washington, D.C. Reagan-National

Wed 8/27

6:00 am-10:35 am

1 stop7h 35m

$277

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Sat 8/30

1:15 pm-11:32 pm

1 stop7h 17m

Washington, D.C. Dulles Intl

Wed 9/17

6:00 am-10:42 am

1 stop7h 42m

$277

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 $260.

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 $418. 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 $571.

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 $375. 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 $445 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 $319 on momondo.

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

There are 1 cabin classes 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 30% 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 10% 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

$105

Fastest flight time

4h 45m

Direct flights

Every day

Airports in Washington, D.C.

3 airports
The best one-way flight to Washington, D.C. from Ontario in the past 72 hours is $105. The best round-trip flight deal from Ontario to Washington, D.C. found on momondo in the last 72 hours is $210.
The fastest flight from Ontario to Washington, D.C. takes 4h 45m
Direct flights go from Ontario to Washington, D.C. every day.
There are 3 airports near Washington, D.C.: Washington, D.C. Reagan-National (DCA), Baltimore/Washington (BWI), Washington, D.C. Dulles Intl (IAD)
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 50m.

  • 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
8,054 reviews
Search Spirit Airlines flights
FrontierPriceFrom $147Free CancellationRating
5.8
3,232 reviews
Search Frontier flights
SouthwestPriceFrom $258Free CancellationRating
8.0
4,246 reviews
Search Southwest flights
DeltaPriceFrom $286Free CancellationRating
8.0
7,987 reviews
Search Delta flights
American AirlinesPriceFrom $286Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
United AirlinesPriceFrom $298Free CancellationRating
7.4
8,915 reviews
Search United 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
Laurel
Silver Spring
Tysons
Waldorf
Fredericksburg
Colonial Beach
Manassas
Rockville
Towson
Gaithersburg
Fairfax
Reston
Glen Burnie
Linthicum Heights
Springfield

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