Latest deals
Insights
When to book
FAQs
Reviews
Price Alerts

Cheap flights from Washington, D.C. to Los Angeles from $92

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 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.
1 adult
0 bags

Discover deals from 900+ travel sites with momondo.

Save money when you book flights with momondo

Big names and deals

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

Find the cheapest flights from Washington, D.C. to Los Angeles (WAS-ONT)

Cheap round-trip flights

Frontier Logo
10:17 am - 3:29 pmIAD-ONT
8h 12m1 stop
Frontier Logo
7:15 pm - 9:17 amONT-IAD
11h 02m1 stop
$161Frontier
Find Deal
Thu, Sep 11 - Sun, Sep 14
Frontier Logo
10:17 am - 3:29 pmIAD-ONT
8h 12m1 stop
Frontier Logo
7:15 pm - 9:17 amONT-IAD
11h 02m1 stop
$162Frontier
Find Deal
Thu, Sep 25 - Sun, Sep 28
Delta Logo
6:00 am - 10:40 amDCA-ONT
7h 40m1 stop
Delta Logo
10:30 pm - 9:14 amONT-DCA
7h 44m1 stop
$297Delta
Find Deal
Tue, Nov 11 - Tue, Jan 6
Delta Logo
3:31 pm - 10:23 pmIAD-ONT
9h 52m1 stop
Delta Logo
11:55 am - 11:17 pmONT-IAD
8h 22m1 stop
$297Delta
Find Deal
Wed, Sep 17 - Tue, Sep 23
American Airlines Logo
2:21 pm - 9:24 pmIAD-ONT
10h 03m1 stop
American Airlines Logo
11:59 pm - 10:51 amONT-IAD
7h 52m1 stop
$330American Airlines
Find Deal
Fri, Oct 3 - Sat, Oct 11
United Airlines Logo
4:10 pm - 9:25 pmIAD-ONT
8h 15m1 stop
United Airlines Logo
6:27 pm - 5:24 amONT-IAD
7h 57m1 stop
$344United Airlines
Find Deal
Fri, Sep 19 - Sun, Sep 28
American Airlines Logo
5:40 pm - 10:33 pmIAD-ONT
7h 53m1 stop
American Airlines Logo
7:16 pm - 10:07 amONT-IAD
11h 51m2 stops
$358American Airlines
Find Deal
Fri, Sep 26 - Thu, Oct 2
United Airlines Logo
6:30 am - 12:37 pmIAD-ONT
9h 07m1 stop
United Airlines Logo
6:38 pm - 5:27 amONT-IAD
7h 49m1 stop
$362United Airlines
Find Deal
Thu, Oct 30 - Sun, Nov 2
Southwest Logo
1:45 pm - 9:00 pmIAD-ONT
10h 15m2 stops
Southwest Logo
8:30 am - 10:10 pmONT-IAD
10h 40m2 stops
$372Southwest
Find Deal
Thu, Oct 30 - Tue, Nov 4
Southwest Logo
7:45 pm - 11:40 pmIAD-ONT
6h 55m1 stop
Southwest Logo
9:15 am - 11:30 pmONT-IAD
11h 15m2 stops
$377Southwest
Find Deal
Thu, Oct 30 - Sun, Nov 2

Frontier flights from Washington, D.C. to Ontario

Our best Frontier deals on Washington, D.C. to Ontario flight tickets
Frontier
Sep 11
IAD10:17 amWashington, D.C. Dulles Intl
8h 12m
1 stop
ONT3:29 pmOntario
Sep 14
ONT7:15 pmOntario
11h 02m
1 stop
IAD9:17 amWashington, D.C. Dulles Intl
$161
Find similar
Frontier
Sep 25
IAD10:17 amWashington, D.C. Dulles Intl
8h 12m
1 stop
ONT3:29 pmOntario
Sep 28
ONT7:15 pmOntario
11h 02m
1 stop
IAD9:17 amWashington, D.C. Dulles Intl
$162
Find similar
Frontier
Sep 12
BWI6:27 pmBaltimore/Washington
28h 27m
1 stop
ONT7:54 pmOntario
Sep 14
ONT8:59 pmOntario
17h 43m
1 stop
BWI5:42 pmBaltimore/Washington
$164
Find similar

Delta flights from Washington, D.C. to Ontario

Our best Delta deals on Washington, D.C. to Ontario flight tickets
Delta
Sep 17
IAD3:31 pmWashington, D.C. Dulles Intl
9h 52m
1 stop
ONT10:23 pmOntario
Sep 23
ONT11:55 amOntario
8h 22m
1 stop
IAD11:17 pmWashington, D.C. Dulles Intl
$297
Find similar
Delta
Sep 16
IAD6:00 amWashington, D.C. Dulles Intl
9h 17m
2 stops
ONT12:17 pmOntario
Sep 24
ONT5:40 pmOntario
9h 21m
1 stop
IAD6:01 amWashington, D.C. Dulles Intl
$302
Find similar
Delta
Nov 15
DCA6:00 amWashington, D.C. Reagan-National
7h 40m
1 stop
ONT10:40 amOntario
Dec 17
ONT12:00 pmOntario
7h 16m
1 stop
DCA10:16 pmWashington, D.C. Reagan-National
$307
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 August 26, 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

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Thu 9/11

10:17 am-3:29 pm

1 stop8h 12m

Ontario

Sun 9/14

7:15 pm-9:17 am

1 stop11h 02m

$161

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Thu 9/25

10:17 am-3:29 pm

1 stop8h 12m

Ontario

Sun 9/28

7:15 pm-9:17 am

1 stop11h 02m

$162

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Tue 11/11

6:00 am-10:40 am

1 stop7h 40m

Ontario

Tue 1/6

10:30 pm-9:14 am

1 stop7h 44m

$297

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Wed 9/17

3:31 pm-10:23 pm

1 stop9h 52m

Ontario

Tue 9/23

11:55 am-11:17 pm

1 stop8h 22m

$297

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Fri 10/3

2:21 pm-9:24 pm

1 stop10h 03m

Ontario

Sat 10/11

11:59 pm-10:51 am

1 stop7h 52m

$330

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Fri 9/19

4:10 pm-9:25 pm

1 stop8h 15m

Ontario

Sun 9/28

6:27 pm-5:24 am

1 stop7h 57m

$344

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Fri 9/26

5:40 pm-10:33 pm

1 stop7h 53m

Ontario

Thu 10/2

7:16 pm-10:07 am

2 stops11h 51m

$358

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Thu 10/30

6:30 am-12:37 pm

1 stop9h 07m

Ontario

Sun 11/2

6:38 pm-5:27 am

1 stop7h 49m

$362

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Thu 10/30

1:45 pm-9:00 pm

2 stops10h 15m

Ontario

Tue 11/4

8:30 am-10:10 pm

2 stops10h 40m

$372

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Thu 10/30

7:45 pm-11:40 pm

1 stop6h 55m

Ontario

Sun 11/2

9:15 am-11:30 pm

2 stops11h 15m

$377

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

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, 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 February instead. Flights to Ontario in February, while not as cheap as those in April, still average around $342.

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 $447 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 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.

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

As of August 2025, prices for Washington, D.C. to Ontario flights are approximately 12% 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

$168

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 $168. The best round-trip flight deal from Washington, D.C. to Ontario found on momondo in the last 72 hours is $337.
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)
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 6h 55m, 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 $147Free CancellationRating
5.8
3,200 reviews
Search Frontier flights
United AirlinesPriceFrom $218Free CancellationRating
7.4
8,943 reviews
Search United Airlines flights
DeltaPriceFrom $278Free CancellationRating
7.9
7,979 reviews
Search Delta flights
American AirlinesPriceFrom $286Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
SouthwestPriceFrom $296Free CancellationRating
8.0
4,243 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.

An easier way to manage your Ontario trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Sun 8/31
Sun 9/7
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to the United States