What airlines fly to Ontario?

United Airlines, Spirit Airlines and American Airlines are the top three most popular airlines that fly to Ontario from Washington, D.C. according to our data. United Airlines is the first choice among our users, with 45% of people opting to fly with this airline when traveling to Ontario. Keep in mind that there are 9 different airlines that fly to Ontario on a routine basis, so you have a few additional options to choose from.

What is the cheapest airline that flies from Washington, D.C. to Ontario?

Southwest, American Airlines, and Frontier are the most popular carriers operating from Washington, D.C. to Ontario

How many flights depart from Washington, D.C. to Ontario on average per week?

The number of flights available between Washington, D.C. and Ontario is 9 per week as of July 2025. The most frequent departure day is Tue, with 33% of weekly flights leaving on this day.

How many flights depart from Washington, D.C. to Ontario on average per day?

The number of flights available between Washington, D.C. and Ontario is 1 per day as of July 2025. The most frequent departure time is 4:00PM, with 66% of daily flights leaving in the evening.

How long does it take to fly to Ontario?

Average flight duration from Washington, D.C. to Ontario depends on which airport you fly into and out of. Flying from Washington, D.C. to Los Angeles is 5h 19m on average, while flying from Baltimore to Los Angeles is 5h 32m on average. Los Angeles is the most popular airport in Ontario.

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?

There are 5 operators available for flights from Washington, D.C. to Ontario Airport as of July 2025.

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.

$90 Cheap Flights from Washington, D.C. to Ontario in 2025

Q: What is the typical price of a round-trip flight between Washington, D.C. and Ontario?

Prices are currently low for flights on this route. Typical prices usually range from $326 to $448. The lowest price recently found on this route was $179.

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Find the cheapest flights from Washington, D.C. to Los Angeles

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Cheap round-trip flights

4:35 pm - 8:45 pmBWI-ONT

7h 10m1 stop

7:15 pm - 5:05 amONT-BWI

6h 50m1 stop

$179Southwest

Find Deal

Tue, Aug 19 - Tue, Oct 28

1:55 pm - 8:10 pmDCA-ONT

9h 15m1 stop

8:10 am - 8:35 pmONT-DCA

9h 25m1 stop

$183Southwest

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Tue, Aug 19 - Tue, Oct 28

6:27 am - 11:52 amIAD-ONT

8h 25m1 stop

11:59 pm - 11:01 amONT-IAD

8h 02m1 stop

$183American Airlines

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Wed, Aug 6 - Wed, Aug 13

6:27 am - 5:52 pmIAD-ONT

14h 25m2 stops

10:29 pm - 8:42 amONT-IAD

7h 13m1 stop

$188American Airlines

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Wed, Aug 6 - Sat, Aug 16

7:30 am - 4:20 pmIAD-ONT

11h 50m1 stop

5:14 pm - 6:34 amONT-IAD

10h 20m1 stop

$229Frontier

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Sat, Aug 2 - Thu, Aug 7

4:20 pm - 8:54 pmBWI-ONT

7h 34m1 stop

5:10 am - 3:14 pmONT-BWI

7h 04m1 stop

$229United Airlines

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Mon, Aug 11 - Tue, Aug 19

4:20 pm - 8:43 pmBWI-ONT

7h 23m1 stop

1:42 pm - 5:21 amONT-BWI

12h 39m2 stops

$234United Airlines

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Tue, Aug 19 - Thu, Aug 21

7:30 am - 8:52 pmIAD-ONT

16h 22m1 stop

7:22 pm - 6:34 amONT-IAD

8h 12m1 stop

$236Frontier

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Mon, Jul 28 - Mon, Aug 11

4:39 pm - 10:20 pmBWI-ONT

8h 41m1 stop

10:00 pm - 9:22 amONT-BWI

8h 22m1 stop

$277Delta

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Fri, Aug 15 - Thu, Aug 21

6:20 pm - 10:27 pmDCA-ONT

7h 07m1 stop

11:45 am - 9:48 pmONT-DCA

7h 03m1 stop

$277Delta

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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

$183

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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

$188

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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

$189

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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

$234

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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

$240

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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

$275

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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

Prices

Airlines

Other information

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)

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 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?
There are 5 operators available for flights from Washington, D.C. to Ontario Airport as of July 2025.
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?
Based on momondo bookings for this flight route, the most popular plane model on flight routes from Washington, D.C. to Ontario is Boeing 737-800 Passenger/BBJ2 (winglets) (36.08% of total bookings). The next most popular plane models are Boeing 737 MAX 9 (18.56%), Airbus A321neo (12.37%), and Boeing 737 MAX 8 (8.25%).
What is the most popular airline from Washington, D.C. to Ontario?
Based on momondo bookings for flights between Washington, D.C. and Ontario, the leading airline is Frontier, making up 33% of the total bookings. Other popular airlines include Southwest with 22%, American Airlines with 21%, and Delta with 11%.

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
Frontier	PriceFrom $148	Free Cancellation	Rating 5.9 3,271 reviews	Search Frontier flights
United Airlines	PriceFrom $222	Free Cancellation	Rating 7.4 8,846 reviews	Search United Airlines flights
American Airlines	PriceFrom $276	Free Cancellation	Rating 7.2 10,000 reviews	Search American Airlines flights
Delta	PriceFrom $286	Free Cancellation	Rating 8.0 7,951 reviews	Search Delta flights
Southwest	PriceFrom $326	Free Cancellation	Rating 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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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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American Airlines flights from Washington, D.C. to Ontario

Our best American Airlines deals on Washington, D.C. to Ontario flight tickets

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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?

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

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

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?

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.

What is the cheapest airline that flies from Washington, D.C. to Ontario?

Southwest, American Airlines, and Frontier are the most popular carriers operating from Washington, D.C. to Ontario

What airlines fly to Ontario?

How many flights depart from Washington, D.C. to Ontario on average per day?

The number of flights available between Washington, D.C. and Ontario is 1 per day as of July 2025. The most frequent departure time is 4:00PM, with 66% of daily flights leaving in the evening.

How many flights depart from Washington, D.C. to Ontario on average per week?

The number of flights available between Washington, D.C. and Ontario is 9 per week as of July 2025. The most frequent departure day is Tue, with 33% of weekly flights leaving on this day.

How long does it take to fly to Ontario?

Average flight duration from Washington, D.C. to Ontario depends on which airport you fly into and out of. Flying from Washington, D.C. to Los Angeles is 5h 19m on average, while flying from Baltimore to Los Angeles is 5h 32m on average. Los Angeles is the most popular airport in Ontario.

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

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

Fastest flight time

Direct flights

Airports in Ontario

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

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

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?

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

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

Why use momondo?

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

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

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

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

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.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to the United States

Airports servicing California