Cheap flights from Washington, D.C. to Los Angeles from $90

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 10/8. 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

Southwest Logo
4:35 pm - 8:45 pmBWI-ONT
7h 10m1 stop
Southwest Logo
7:15 pm - 5:05 amONT-BWI
6h 50m1 stop
$179Southwest
Find Deal
Tue, Aug 19 - Tue, Oct 28
Southwest Logo
1:55 pm - 8:10 pmDCA-ONT
9h 15m1 stop
Southwest Logo
8:10 am - 8:35 pmONT-DCA
9h 25m1 stop
$183Southwest
Find Deal
Tue, Aug 19 - Tue, Oct 28
American Airlines Logo
6:27 am - 11:52 amIAD-ONT
8h 25m1 stop
American Airlines Logo
11:59 pm - 11:01 amONT-IAD
8h 02m1 stop
$183American Airlines
Find Deal
Wed, Aug 6 - Wed, Aug 13
American Airlines Logo
6:27 am - 5:52 pmIAD-ONT
14h 25m2 stops
American Airlines Logo
10:29 pm - 8:42 amONT-IAD
7h 13m1 stop
$188American Airlines
Find Deal
Wed, Aug 6 - Sat, Aug 16
Frontier Logo
7:30 am - 4:20 pmIAD-ONT
11h 50m1 stop
Frontier Logo
5:14 pm - 6:34 amONT-IAD
10h 20m1 stop
$229Frontier
Find Deal
Sat, Aug 2 - Thu, Aug 7
United Airlines Logo
4:20 pm - 8:54 pmBWI-ONT
7h 34m1 stop
United Airlines Logo
5:10 am - 3:14 pmONT-BWI
7h 04m1 stop
$229United Airlines
Find Deal
Mon, Aug 11 - Tue, Aug 19
United Airlines Logo
4:20 pm - 8:43 pmBWI-ONT
7h 23m1 stop
United Airlines Logo
1:42 pm - 5:21 amONT-BWI
12h 39m2 stops
$234United Airlines
Find Deal
Tue, Aug 19 - Thu, Aug 21
Frontier Logo
7:30 am - 8:52 pmIAD-ONT
16h 22m1 stop
Frontier Logo
7:22 pm - 6:34 amONT-IAD
8h 12m1 stop
$236Frontier
Find Deal
Mon, Jul 28 - Mon, Aug 11
Delta Logo
4:39 pm - 10:20 pmBWI-ONT
8h 41m1 stop
Delta Logo
10:00 pm - 9:22 amONT-BWI
8h 22m1 stop
$277Delta
Find Deal
Fri, Aug 15 - Thu, Aug 21
Delta Logo
6:20 pm - 10:27 pmDCA-ONT
7h 07m1 stop
Delta Logo
11:45 am - 9:48 pmONT-DCA
7h 03m1 stop
$277Delta
Find Deal
Tue, Aug 5 - Wed, Aug 13

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

Our best American Airlines deals on Washington, D.C. to Ontario flight tickets
American Airlines
Aug 6
IAD6:27 amWashington, D.C. Dulles Intl
8h 25m
1 stop
ONT11:52 amOntario
Aug 13
ONT11:59 pmOntario
8h 02m
1 stop
IAD11:01 amWashington, D.C. Dulles Intl
American Airlines
Aug 6
IAD6:27 amWashington, D.C. Dulles Intl
14h 25m
2 stops
ONT5:52 pmOntario
Aug 16
ONT10:29 pmOntario
7h 13m
1 stop
IAD8:42 amWashington, D.C. Dulles Intl
American Airlines
Aug 19
DCA5:00 amWashington, D.C. Reagan-National
9h 52m
1 stop
ONT11:52 amOntario
Aug 21
ONT7:02 pmOntario
8h 58m
1 stop
DCA7:00 amWashington, D.C. Reagan-National

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

Our best Alaska Airlines deals on Washington, D.C. to Ontario flight tickets
Alaska Airlines
Sep 3
IAD7:00 amWashington, D.C. Dulles Intl
10h 12m
1 stop
ONT2:12 pmOntario
Sep 8
ONT7:47 pmOntario
8h 46m
1 stop
IAD7:33 amWashington, D.C. Dulles Intl
Alaska Airlines
Sep 9
IAD7:00 amWashington, D.C. Dulles Intl
10h 12m
1 stop
ONT2:12 pmOntario
Sep 15
ONT7:47 pmOntario
8h 46m
1 stop
IAD7:33 amWashington, D.C. Dulles Intl
Alaska Airlines
Sep 4
IAD7:00 amWashington, D.C. Dulles Intl
10h 12m
1 stop
ONT2:12 pmOntario
Sep 8
ONT7:47 pmOntario
8h 46m
1 stop
IAD7:33 amWashington, D.C. Dulles Intl

See travel insights to Los Angeles from

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, August 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 $298. If you aren’t able to travel during the month of August, then book flights to Ontario from Washington, D.C. during April instead. Flights to Ontario in April, while not as cheap as those in August, still average around $326.

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

How far in advance should I book a flight to Ontario?

You are more likely to see cheaper flights to Ontario from Washington, D.C. when booking weeks ahead of your departure date. In general, you can expect to find flights to Ontario for around $461 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Ontario from Washington, D.C. for as low as $335 on momondo.

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

There are 1 cabin classes 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.

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

As of July 2025, prices for Washington, D.C. to Ontario flights are approximately 1% 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

$90

Fastest flight time

5h 15m

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 $90. The best round-trip flight deal from Washington, D.C. to Ontario found on momondo in the last 72 hours is $179.
The fastest flight from Washington, D.C. to Ontario takes 5h 15m
Direct flights go from Washington, D.C. to Ontario every day.
There is 1 airport near Ontario: Ontario (ONT)

  • 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 5h 15m, 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 $148Free CancellationRating
5.9
3,271 reviews
Search Frontier flights
United AirlinesPriceFrom $222Free CancellationRating
7.4
8,846 reviews
Search United Airlines flights
American AirlinesPriceFrom $276Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
DeltaPriceFrom $286Free CancellationRating
8.0
7,951 reviews
Search Delta flights
SouthwestPriceFrom $326Free CancellationRating
8.0
4,249 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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Tue 7/15
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