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Cheap flights from Ontario to Washington, D.C. from $79

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 5/1. 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.

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
8:06 pm - 8:18 pm
ONT
-
BWI
21h 12m
1 stop
Frontier Logo
5:34 pm - 7:35 am
BWI
-
ONT
17h 01m
1 stop
$160Frontier
Wed, May 6 - Sat, May 9
Frontier Logo
12:59 am - 1:00 pm
ONT
-
DCA
9h 01m
1 stop
Frontier Logo
6:00 pm - 11:49 pm
DCA
-
ONT
8h 49m
1 stop
$160Frontier
Fri, May 1 - Sat, May 9
Frontier Logo
8:06 pm - 8:23 pm
ONT
-
BWI
21h 17m
1 stop
Frontier Logo
5:17 pm - 8:20 am
BWI
-
ONT
18h 03m
1 stop
$161Frontier
Tue, May 5 - Fri, May 8
Frontier Logo
12:59 am - 12:59 pm
ONT
-
DCA
9h 00m
1 stop
Frontier Logo
1:59 pm - 11:55 pm
DCA
-
ONT
12h 56m
1 stop
$161Frontier
Fri, Apr 24 - Sat, May 2
Frontier Logo
8:06 pm - 8:23 pm
ONT
-
BWI
21h 17m
1 stop
Frontier Logo
4:31 pm - 7:35 am
BWI
-
ONT
18h 04m
1 stop
$162Frontier
Fri, May 8 - Tue, May 12
Frontier Logo
12:59 am - 4:59 pm
ONT
-
DCA
13h 00m
1 stop
Frontier Logo
7:59 am - 7:31 am
DCA
-
ONT
26h 32m
1 stop
$162Frontier
Tue, Apr 21 - Sun, Apr 26
Frontier Logo
8:26 am - 8:09 pm
ONT
-
BWI
8h 43m
1 stop
Frontier Logo
12:15 pm - 7:35 am
BWI
-
ONT
22h 20m
1 stop
$166Frontier
Fri, May 1 - Mon, May 4
Frontier Logo
8:26 am - 8:09 pm
ONT
-
BWI
8h 43m
1 stop
Frontier Logo
12:15 pm - 7:35 am
BWI
-
ONT
22h 20m
1 stop
$167Frontier
Fri, May 1 - Mon, May 4
Frontier Logo
12:59 am - 12:59 pm
ONT
-
DCA
9h 00m
1 stop
Frontier Logo
7:59 am - 11:55 pm
DCA
-
ONT
18h 56m
1 stop
$167Frontier
Mon, Apr 20 - Tue, Apr 28
Frontier Logo
12:59 am - 9:59 pm
ONT
-
DCA
18h 00m
1 stop
Frontier Logo
7:00 am - 10:05 am
DCA
-
ONT
30h 05m
1 stop
$171Frontier
Thu, Apr 30 - Thu, May 7

Frontier flights from Ontario to Washington, D.C.

Our best Frontier deals on Ontario to Washington, D.C. flight tickets
Frontier
May 5
ONT8:06 pmOntario
21h 12m
1 stop
BWI8:18 pmBaltimore/Washington
May 8
BWI5:17 pmBaltimore/Washington
18h 03m
1 stop
ONT8:20 amOntario
$160
Frontier
May 5
ONT8:06 pmOntario
21h 17m
1 stop
BWI8:23 pmBaltimore/Washington
May 8
BWI5:17 pmBaltimore/Washington
18h 03m
1 stop
ONT8:20 amOntario
$161
Frontier
May 8
ONT8:06 pmOntario
21h 17m
1 stop
BWI8:23 pmBaltimore/Washington
May 12
BWI4:31 pmBaltimore/Washington
18h 04m
1 stop
ONT7:35 amOntario
$162

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

Our best Alaska Airlines deals on Ontario to Washington, D.C. flight tickets
Alaska Airlines
May 8
ONT3:26 pmOntario
11h 24m
1 stop
IAD5:50 amWashington, D.C. Dulles Intl
May 12
IAD7:10 amWashington, D.C. Dulles Intl
10h 22m
1 stop
ONT2:32 pmOntario
$341
Alaska Airlines
Apr 15
ONT6:00 amOntario
9h 11m
1 stop
IAD6:11 pmWashington, D.C. Dulles Intl
Apr 22
IAD7:10 amWashington, D.C. Dulles Intl
10h 22m
1 stop
ONT2:32 pmOntario
$560
Alaska Airlines
Apr 16
ONT6:00 amOntario
9h 11m
1 stop
IAD6:11 pmWashington, D.C. Dulles Intl
Apr 21
IAD7:00 amWashington, D.C. Dulles Intl
14h 13m
1 stop
ONT6:13 pmOntario
$578

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 April 2, 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

Cheapest round-trip

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Wed 5/6

8:06 pm-8:18 pm

1 stop21h 12m

Baltimore/Washington

Sat 5/9

5:34 pm-7:35 am

1 stop17h 01m

$160
Quickest round-trip

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Fri 5/1

12:59 am-1:00 pm

1 stop9h 01m

Washington, D.C. Reagan-National

Sat 5/9

6:00 pm-11:49 pm

1 stop8h 49m

$160

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Tue 5/5

8:06 pm-8:23 pm

1 stop21h 17m

Baltimore/Washington

Fri 5/8

5:17 pm-8:20 am

1 stop18h 03m

$161

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Fri 4/24

12:59 am-12:59 pm

1 stop9h 00m

Washington, D.C. Reagan-National

Sat 5/2

1:59 pm-11:55 pm

1 stop12h 56m

$161

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Fri 5/8

8:06 pm-8:23 pm

1 stop21h 17m

Baltimore/Washington

Tue 5/12

4:31 pm-7:35 am

1 stop18h 04m

$162

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Tue 4/21

12:59 am-4:59 pm

1 stop13h 00m

Washington, D.C. Reagan-National

Sun 4/26

7:59 am-7:31 am

1 stop26h 32m

$162

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Fri 5/1

8:26 am-8:09 pm

1 stop8h 43m

Baltimore/Washington

Mon 5/4

12:15 pm-7:35 am

1 stop22h 20m

$166

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Fri 5/1

8:26 am-8:09 pm

1 stop8h 43m

Baltimore/Washington

Mon 5/4

12:15 pm-7:35 am

1 stop22h 20m

$167

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Mon 4/20

12:59 am-12:59 pm

1 stop9h 00m

Washington, D.C. Reagan-National

Tue 4/28

7:59 am-11:55 pm

1 stop18h 56m

$167

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Thu 4/30

12:59 am-9:59 pm

1 stop18h 00m

Washington, D.C. Reagan-National

Thu 5/7

7:00 am-10:05 am

1 stop30h 05m

$171

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 January is, on average, the cheapest month to fly to Washington, D.C. from Ontario, with most prices found around $223. If you’re not able to fly to Washington, D.C. in January, then September is your next best option. Flight prices from Ontario to Washington, D.C. during September average around $226.

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 $427. 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 $575.

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 $400. 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 $481. 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 $472 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 22% 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 April 2026, prices for Ontario to Washington, D.C. flights are approximately 18% 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

$199

Fastest flight time

4h 45m

Direct flights

Every day

Airports in Washington, D.C.

2 airports
The best one-way flight to Washington, D.C. from Ontario in the past 72 hours is $199. The best round-trip flight deal from Ontario to Washington, D.C. found on momondo in the last 72 hours is $407.
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 2 airports in Washington, D.C.. From Ontario there are direct flights to Baltimore/Washington (BWI).
Search flight deals

Frequently asked questions about flying from Ontario to Washington, D.C.

  • 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 45m.

  • 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 $72Free CancellationRating
6.3
8,576 reviews
Search Spirit Airlines flights
FrontierPriceFrom $136Free CancellationRating
5.7
3,004 reviews
Search Frontier flights
DeltaPriceFrom $172Free CancellationRating
7.9
8,371 reviews
Search Delta flights
United AirlinesPriceFrom $226Free CancellationRating
7.4
9,532 reviews
Search United Airlines flights
American AirlinesPriceFrom $256Free CancellationRating
7.1
11,549 reviews
Search American Airlines flights
SouthwestPriceFrom $258Free CancellationRating
8.0
4,337 reviews
Search Southwest 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
Laurel
Colonial Beach
Gaithersburg
Towson
Silver Spring
Fredericksburg
Rockville
Tysons
Manassas
Linthicum Heights
Springfield
Bethesda
Fairfax
College Park

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.

An easier way to manage your Washington, D.C. trip

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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