What airlines fly to Ontario?

United Airlines, Frontier and American Airlines are the top three most popular airlines that fly to Ontario from Washington, D.C. Dulles Intl Airport according to our data. United Airlines is the first choice among our users, with 82% 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. Dulles Intl to Ontario?

Delta and United Airlines are the most popular carriers operating from Washington, D.C. Dulles Intl to Ontario

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

Prices for flights from Washington, D.C. Dulles Intl Airport to Ontario Airport are refreshed on a daily basis.

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

As of May 2026, there are 5 operators available to choose from for flights from Washington, D.C. Dulles Intl Airport to Ontario Airport.

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

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 Washington, D.C. Dulles Intl Airport 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.

$105 Cheap Flights from Washington, D.C. Dulles Intl Airport to Ontario in 2026

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

Prices are currently low for flights on this route. Typical prices usually range from $817 to $283. The lowest price recently found on this route was $210.

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

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

9:50 am - 3:07 pm

IAD

ONT

8h 17m

1 stop

3:40 pm - 8:20 am

ONT

IAD

13h 40m

1 stop

$210Frontier

Wed, Jul 8 - Wed, Jul 29

9:12 am - 7:32 pm

IAD

ONT

13h 20m

1 stop

3:30 pm - 8:12 am

ONT

IAD

13h 42m

1 stop

$215Frontier

Tue, Jun 2 - Fri, Jun 5

9:12 am - 8:04 am

IAD

ONT

25h 52m

1 stop

4:39 pm - 8:12 am

ONT

IAD

12h 33m

1 stop

$216Frontier

Thu, May 28 - Wed, Jun 3

9:12 am - 3:44 pm

IAD

ONT

9h 32m

1 stop

1:33 pm - 8:25 am

ONT

IAD

15h 52m

1 stop

$217Frontier

Tue, Jun 2 - Tue, Jun 9

9:12 am - 3:09 pm

IAD

ONT

8h 57m

1 stop

3:30 pm - 8:12 am

ONT

IAD

13h 42m

1 stop

$220Frontier

Mon, Jun 1 - Sat, Jun 6

9:12 am - 7:32 pm

IAD

ONT

13h 20m

1 stop

3:34 pm - 8:25 am

ONT

IAD

13h 51m

1 stop

$221Frontier

Wed, Jun 3 - Wed, Jun 17

9:12 am - 3:09 pm

IAD

ONT

8h 57m

1 stop

3:34 pm - 8:25 am

ONT

IAD

13h 51m

1 stop

$222Frontier

Fri, Jun 5 - Wed, Jun 10

9:55 am - 3:08 pm

IAD

ONT

8h 13m

1 stop

3:40 pm - 8:20 am

ONT

IAD

13h 40m

1 stop

$224Frontier

Wed, Jul 1 - Wed, Jul 15

9:12 am - 8:04 am

IAD

ONT

25h 52m

1 stop

4:39 pm - 8:12 am

ONT

IAD

12h 33m

1 stop

$226Frontier

Thu, May 28 - Wed, Jun 3

9:12 am - 8:04 am

IAD

ONT

25h 52m

1 stop

4:39 pm - 8:12 am

ONT

IAD

12h 33m

1 stop

$227Frontier

Thu, May 28 - Wed, Jun 3

Frontier flights from Washington, D.C. Dulles Intl Airport to Ontario

Our best Frontier deals on Washington, D.C. Dulles Intl Airport to Ontario flight tickets

Frontier

Jul 8

IAD9:50 amWashington, D.C. Dulles Intl

8h 17m

1 stop

ONT3:07 pmOntario

Jul 29

ONT3:40 pmOntario

13h 40m

1 stop

IAD8:20 amWashington, D.C. Dulles Intl

$210

Frontier

Jun 2

IAD9:12 amWashington, D.C. Dulles Intl

13h 20m

1 stop

ONT7:32 pmOntario

Jun 5

ONT3:30 pmOntario

13h 42m

1 stop

IAD8:12 amWashington, D.C. Dulles Intl

$215

Frontier

May 28

IAD9:12 amWashington, D.C. Dulles Intl

25h 52m

1 stop

ONT8:04 amOntario

Jun 3

ONT4:39 pmOntario

12h 33m

1 stop

IAD8:12 amWashington, D.C. Dulles Intl

$216

Delta flights from Washington, D.C. Dulles Intl Airport to Ontario

Our best Delta deals on Washington, D.C. Dulles Intl Airport to Ontario flight tickets

Delta

May 8

IAD7:33 pmWashington, D.C. Dulles Intl

26h 03m

2 stops

ONT6:36 pmOntario

May 11

ONT10:00 pmOntario

17h 53m

2 stops

IAD6:53 pmWashington, D.C. Dulles Intl

$523

Delta

May 14

IAD12:37 pmWashington, D.C. Dulles Intl

8h 59m

1 stop

ONT6:36 pmOntario

May 19

ONT10:00 pmOntario

17h 53m

2 stops

IAD6:53 pmWashington, D.C. Dulles Intl

$541

momondo Fare Finder

Use the filters below to find and compare flights from Washington, D.C. Dulles Intl Airport to Ontario that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Wed 7/8

9:50 am-3:07 pm

1 stop8h 17m

Ontario

Wed 7/29

3:40 pm-8:20 am

1 stop13h 40m

$210

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Tue 6/2

9:12 am-7:32 pm

1 stop13h 20m

Ontario

Fri 6/5

3:30 pm-8:12 am

1 stop13h 42m

$215

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Thu 5/28

9:12 am-8:04 am

1 stop25h 52m

Ontario

Wed 6/3

4:39 pm-8:12 am

1 stop12h 33m

$216

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Tue 6/2

9:12 am-3:44 pm

1 stop9h 32m

Ontario

Tue 6/9

1:33 pm-8:25 am

1 stop15h 52m

$217

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Mon 6/1

9:12 am-3:09 pm

1 stop8h 57m

Ontario

Sat 6/6

3:30 pm-8:12 am

1 stop13h 42m

$220

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Wed 6/3

9:12 am-7:32 pm

1 stop13h 20m

Ontario

Wed 6/17

3:34 pm-8:25 am

1 stop13h 51m

$221

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Fri 6/5

9:12 am-3:09 pm

1 stop8h 57m

Ontario

Wed 6/10

3:34 pm-8:25 am

1 stop13h 51m

$222

Quickest round-trip

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Wed 7/1

9:55 am-3:08 pm

1 stop8h 13m

Ontario

Wed 7/15

3:40 pm-8:20 am

1 stop13h 40m

$224

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Thu 5/28

9:12 am-8:04 am

1 stop25h 52m

Ontario

Wed 6/3

4:39 pm-8:12 am

1 stop12h 33m

$226

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Thu 5/28

9:12 am-8:04 am

1 stop25h 52m

Ontario

Wed 6/3

4:39 pm-8:12 am

1 stop12h 33m

$227

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from Washington, D.C. Dulles Intl Airport 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

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

What is the cheapest month to fly to Ontario?

In general, September is the cheapest month to fly from Washington, D.C. Dulles Intl Airport to Ontario. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $273. If you aren’t able to travel during the month of September, then book flights to Ontario from Washington, D.C. Dulles Intl Airport during August instead. Flights to Ontario in August, while not as cheap as those in September, still average around $329.

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

As of May 2026, prices for Washington, D.C. Dulles Intl Airport to Ontario flights are approximately 9% cheaper when compared to flights at the same time last year.

When to book flights from Washington, D.C. Dulles Intl Airport to Ontario

Are you open to changing your travel dates? Check out the ideal times to fly from Washington, D.C. Dulles Intl Airport 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. Dulles Intl Airport to Ontario (IAD to ONT) flight deals and tips

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

Fastest flight time	7h 04m
Direct flights	None

The fastest flight from Washington, D.C. Dulles Intl Airport to Ontario takes 7h 04m

There are no direct flights from Washington, D.C. Dulles Intl Airport to Ontario. There are no popular flight routes from Washington, D.C. Dulles Intl Airport to Ontario.

Search flight deals

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

How far is Washington, D.C. Dulles Intl to Ontario by plane?
There are 2238.2 mi between Washington, D.C. Dulles Intl and Ontario. In terms of flight time, this usually takes a little over 7h 04m.
When did momondo last update prices for flights from Washington, D.C. Dulles Intl Airport to Ontario Airport?
Prices for flights from Washington, D.C. Dulles Intl Airport to Ontario Airport are refreshed on a daily basis.
How many operators does momondo search for flights from Washington, D.C. Dulles Intl Airport to Ontario Airport?
As of May 2026, there are 5 operators available to choose from for flights from Washington, D.C. Dulles Intl Airport to Ontario Airport.
How old do you have to be to fly from Washington, D.C. Dulles Intl Airport to Ontario Airport?
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 Washington, D.C. Dulles Intl Airport 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 airline from Washington, D.C. Dulles Intl Airport to Ontario?
Based on momondo bookings for this flight route, the most popular airline on flight routes from Washington, D.C. Dulles Intl Airport to Ontario is United Airlines (31% of total bookings). The next most popular airlines are Frontier (24%), Southwest (21%), and Delta (14%).

Best airlines flying from Washington, D.C. Dulles Intl Airport to Ontario

Compare and see reviews for airlines that fly from Washington, D.C. Dulles Intl Airport to Ontario with momondo

Airline	Rating	Free Cancellation	Price
Frontier	PriceFrom $125	Free Cancellation	Rating 5.6 2,965 reviews	Search Frontier flights
Delta	PriceFrom $213	Free Cancellation	Rating 7.9 8,460 reviews	Search Delta flights
Southwest	PriceFrom $278	Free Cancellation	Rating 7.9 4,307 reviews	Search Southwest flights
American Airlines	PriceFrom $282	Free Cancellation	Rating 7.1 11,672 reviews	Search American Airlines flights
United Airlines	PriceFrom $284	Free Cancellation	Rating 7.4 9,680 reviews	Search United Airlines flights

Why use momondo?

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

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Washington, D.C. to Ontario. momondo saves you time and could save you money on your trip.

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

Yes. momondo allows you to filter the results for Washington, D.C. to Ontario flights to just show those with flexible booking policies.

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

momondo provides multiple filters to help you find the best flight to Ontario from Washington, D.C.. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

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

Yes. momondo can track prices for Washington, D.C. to Ontario 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 Ontario trip

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Frontier flights from Washington, D.C. Dulles Intl Airport to Ontario

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

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

What is the cheapest month to fly to Ontario?

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

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

What airlines fly to Ontario?

When to book flights from Washington, D.C. Dulles Intl Airport to Ontario

Cheap Washington, D.C. Dulles Intl Airport to Ontario (IAD to ONT) flight deals and tips

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

Fastest flight time

Direct flights

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

Best airlines flying from Washington, D.C. Dulles Intl Airport to Ontario

Compare and see reviews for airlines that fly from Washington, D.C. Dulles Intl Airport to Ontario with momondo

Why use momondo?

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.

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