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Cheap flights from Washington, D.C. to Los Angeles from $76

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Washington, D.C. to Los Angeles departing on 11/13. 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 Washington, D.C. to Los Angeles

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
2:00 pm - 9:27 pmDCA-ONT
10h 27m1 stop
Frontier Logo
6:53 am - 9:59 pmONT-DCA
12h 06m1 stop
$124Frontier
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Wed, Nov 5 - Sat, Nov 8
Frontier Logo
8:15 am - 9:29 pmDCA-ONT
16h 14m1 stop
Frontier Logo
6:53 am - 9:59 pmONT-DCA
12h 06m1 stop
$125Frontier
Find Deal
Wed, Nov 12 - Sat, Nov 15
Frontier Logo
2:00 pm - 9:29 pmDCA-ONT
10h 29m1 stop
Frontier Logo
6:53 am - 1:02 pmONT-DCA
27h 09m1 stop
$141Frontier
Find Deal
Wed, Nov 12 - Fri, Nov 14
United Airlines Logo
4:10 pm - 10:51 pmIAD-ONT
9h 41m1 stop
United Airlines Logo
7:00 am - 4:58 pmONT-IAD
6h 58m1 stop
$300United Airlines
Find Deal
Mon, Nov 17 - Thu, Nov 27
Delta Logo
4:00 pm - 9:14 pmIAD-ONT
8h 14m1 stop
Delta Logo
10:30 pm - 9:11 amONT-IAD
7h 41m1 stop
$305Delta
Find Deal
Tue, Jan 27 - Sat, Feb 28
United Airlines Logo
4:10 pm - 10:51 pmIAD-ONT
9h 41m1 stop
United Airlines Logo
5:05 am - 3:41 pmONT-IAD
7h 36m1 stop
$307United Airlines
Find Deal
Sat, Nov 8 - Sat, Nov 15
Delta Logo
11:05 am - 11:04 pmIAD-ONT
14h 59m2 stops
Delta Logo
12:12 pm - 12:13 amONT-IAD
9h 01m1 stop
$310Delta
Find Deal
Tue, Nov 18 - Mon, Dec 8
Southwest Logo
7:40 am - 6:30 pmIAD-ONT
13h 50m2 stops
Southwest Logo
5:35 am - 5:05 pmONT-IAD
8h 30m1 stop
$330Southwest
Find Deal
Thu, Dec 11 - Thu, Dec 18
American Airlines Logo
6:04 am - 4:01 pmIAD-ONT
12h 57m2 stops
American Airlines Logo
10:34 pm - 10:19 amONT-IAD
8h 45m1 stop
$341American Airlines
Find Deal
Sun, Nov 9 - Sun, Nov 16
Southwest Logo
5:50 pm - 10:05 pmIAD-ONT
7h 15m1 stop
Southwest Logo
8:30 am - 10:00 pmONT-IAD
10h 30m2 stops
$348Southwest
Find Deal
Thu, Nov 13 - Mon, Nov 17

Frontier flights from Washington, D.C. to Ontario

Our best Frontier deals on Washington, D.C. to Ontario flight tickets
Frontier
Nov 5
DCA2:00 pmWashington, D.C. Reagan-National
10h 27m
1 stop
ONT9:27 pmOntario
Nov 8
ONT6:53 amOntario
12h 06m
1 stop
DCA9:59 pmWashington, D.C. Reagan-National
$124
Find similar
Frontier
Nov 12
DCA8:15 amWashington, D.C. Reagan-National
16h 14m
1 stop
ONT9:29 pmOntario
Nov 15
ONT6:53 amOntario
12h 06m
1 stop
DCA9:59 pmWashington, D.C. Reagan-National
$125
Find similar
Frontier
Nov 12
DCA2:00 pmWashington, D.C. Reagan-National
10h 29m
1 stop
ONT9:29 pmOntario
Nov 14
ONT6:53 amOntario
27h 09m
1 stop
DCA1:02 pmWashington, D.C. Reagan-National
$141
Find similar

Delta flights from Washington, D.C. to Ontario

Our best Delta deals on Washington, D.C. to Ontario flight tickets
Delta
Jan 27
IAD4:00 pmWashington, D.C. Dulles Intl
8h 14m
1 stop
ONT9:14 pmOntario
Feb 28
ONT10:30 pmOntario
7h 41m
1 stop
IAD9:11 amWashington, D.C. Dulles Intl
$305
Find similar
Delta
Nov 18
IAD11:05 amWashington, D.C. Dulles Intl
14h 59m
2 stops
ONT11:04 pmOntario
Dec 8
ONT12:12 pmOntario
9h 01m
1 stop
IAD12:13 amWashington, D.C. Dulles Intl
$310
Find similar
Delta
Nov 14
IAD6:00 amWashington, D.C. Dulles Intl
8h 06m
1 stop
ONT11:06 amOntario
Nov 17
ONT10:25 pmOntario
7h 45m
1 stop
IAD9:10 amWashington, D.C. Dulles Intl
$312
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Washington, D.C. to Ontario 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 October 16, 2025.
Use the filters below to find and compare flights from Washington, D.C. to Ontario that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Wed 11/5

2:00 pm-9:27 pm

1 stop10h 27m

Ontario

Sat 11/8

6:53 am-9:59 pm

1 stop12h 06m

$124

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Wed 11/12

8:15 am-9:29 pm

1 stop16h 14m

Ontario

Sat 11/15

6:53 am-9:59 pm

1 stop12h 06m

$125

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Wed 11/12

2:00 pm-9:29 pm

1 stop10h 29m

Ontario

Fri 11/14

6:53 am-1:02 pm

1 stop27h 09m

$141

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Mon 11/17

4:10 pm-10:51 pm

1 stop9h 41m

Ontario

Thu 11/27

7:00 am-4:58 pm

1 stop6h 58m

$300

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Tue 1/27

4:00 pm-9:14 pm

1 stop8h 14m

Ontario

Sat 2/28

10:30 pm-9:11 am

1 stop7h 41m

$305

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Sat 11/8

4:10 pm-10:51 pm

1 stop9h 41m

Ontario

Sat 11/15

5:05 am-3:41 pm

1 stop7h 36m

$307

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Tue 11/18

11:05 am-11:04 pm

2 stops14h 59m

Ontario

Mon 12/8

12:12 pm-12:13 am

1 stop9h 01m

$310

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Thu 12/11

7:40 am-6:30 pm

2 stops13h 50m

Ontario

Thu 12/18

5:35 am-5:05 pm

1 stop8h 30m

$330

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Sun 11/9

6:04 am-4:01 pm

2 stops12h 57m

Ontario

Sun 11/16

10:34 pm-10:19 am

1 stop8h 45m

$341

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Thu 11/13

5:50 pm-10:05 pm

1 stop7h 15m

Ontario

Mon 11/17

8:30 am-10:00 pm

2 stops10h 30m

$348

Flights are sorted by cheapest round-trip flights first.

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How to get the cheapest flight ticket from Washington, D.C. to Ontario

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 Washington, D.C. and Ontario?

What is the cheapest month to fly to Ontario?

In general, April is the cheapest month to fly from Washington, D.C. to Ontario. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $326. If you aren’t able to travel during the month of April, then book flights to Ontario from Washington, D.C. during October instead. Flights to Ontario in October, while not as cheap as those in April, still average around $327.

What is the cheapest day to depart on your flight to Ontario?

The cheapest day to depart on your flight to Ontario is on a Tuesday when prices can be found for as low as $323. This is often the case because there is less demand to fly during this day of the week. When flying out on a Sunday, the most expensive travel day of the week, you can expect to see flight prices from Washington, D.C. to Ontario for around $480.

What is the cheapest time of day to depart on your flight to Ontario?

In the afternoon is the cheapest time of day to fly from Washington, D.C. to Ontario when you can find flight prices for as low as $366. Flying to Ontario in the afternoon is an ideal time because this is during off-peak travel hours. If you have a flexible travel schedule, then try to avoid flying in the evening when prices are $431 on average. Flights to Ontario from Washington, D.C. in the evening are generally more expensive because this time of day is more convenient for travelers’ schedules.

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

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

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

There is only 1 cabin class available to choose from on Washington, D.C. to Ontario 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 Washington, D.C. to Ontario flights?

You could potentially save up to 32% on your flight if you consider stops on a Washington, D.C. to Ontario flight.

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

As of October 2025, prices for Washington, D.C. to Ontario flights are approximately 38% more expensive when compared to flights at the same time last year.

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

Are you open to changing your travel dates? Check out the ideal times to fly from Washington, D.C. to Ontario according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Washington, D.C. to Ontario (WAS to ONT) flight deals and tips

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

Best Price Found

$208

Fastest flight time

5h 25m

Direct flights

Every day

Airports in Ontario

1 airport
The best one-way flight to Ontario from Washington, D.C. in the past 72 hours is $208. The best round-trip flight deal from Washington, D.C. to Ontario found on momondo in the last 72 hours is $407.
The fastest flight from Washington, D.C. to Ontario takes 5h 25m
Direct flights go from Washington, D.C. to Ontario every day.
There is 1 airport near Ontario: Ontario (ONT)
Search flight deals

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

    A flight from Washington, D.C. to Ontario will travel around 2260.6 mi. Flights usually cover this in 7h 05m, depending on flying conditions and air traffic around both airports.

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

    Prices for flights from Washington, D.C. to Ontario Airport were last updated today.

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

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

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Washington, D.C. to Ontario Airport.

  • What documentation or ID do you need to fly to Ontario Airport?

    The travel and health documents required for your trip to Ontario Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Ontario Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

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

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

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

Compare and see reviews for airlines that fly from Washington, D.C. to Ontario with momondo
Airline
Rating
Free Cancellation
Price
FrontierPriceFrom $168Free CancellationRating
5.8
3,137 reviews
Search Frontier flights
DeltaPriceFrom $213Free CancellationRating
7.9
7,984 reviews
Search Delta flights
American AirlinesPriceFrom $256Free CancellationRating
7.2
11,043 reviews
Search American Airlines flights
United AirlinesPriceFrom $284Free CancellationRating
7.4
8,982 reviews
Search United Airlines flights
SouthwestPriceFrom $304Free CancellationRating
8.0
4,241 reviews
Search Southwest flights

Why use momondo?

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

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Ontario from Washington, D.C..

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

momondo does allow users to show only those flights to Ontario from Washington, D.C. which offer a flexible booking policy as well as other useful filters and features.

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

Once you have performed a search for Washington, D.C. to Ontario flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

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

Of course. momondo tracks the price of Washington, D.C. to Ontario flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

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