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ONT - IAD

$144 Find cheap flights from Ontario to Washington Dulles Airport

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Ontario to Dulles Intl departing on 5/25. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
0 bags
Sun 6/2
Sun 6/9

Search hundreds of travel sites at once for deals on flights to Washington Dulles Airport

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Ontario to Washington, D.C., as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Ontario to Washington, D.C., as well as popular online travel agencies
In the last 7 days travelers have searched 43,693,958 times on KAYAK, and here is why:

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Cheap flight deals from Ontario to Dulles Intl (ONT-IAD)

Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Ontario to Dulles Intl that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices and deals for you by selecting your travel dates.
Choose your dates
11:00 pm - 8:36 amONT-IAD
6h 36m1 stop
5:31 pm - 10:00 pmIAD-ONT
7h 29m1 stop
$287American Airlines
Find Deal
Sat, Sep 7 - Tue, Sep 10
6:00 am - 4:27 pmONT-IAD
7h 27m1 stop
11:48 am - 6:59 pmIAD-ONT
10h 11m1 stop
$288American Airlines
Find Deal
Tue, May 21 - Fri, May 31
6:42 pm - 6:26 amONT-IAD
8h 44m1 stop
6:00 am - 10:20 amIAD-ONT
7h 20m1 stop
$290Delta
Find Deal
Tue, Jun 4 - Fri, Jun 14
11:00 pm - 8:36 amONT-IAD
6h 36m1 stop
5:31 pm - 11:26 pmIAD-ONT
8h 55m2 stops
$292American Airlines
Find Deal
Sat, Sep 28 - Tue, Oct 1
12:50 pm - 11:37 pmONT-IAD
7h 47m1 stop
5:02 am - 1:52 pmIAD-ONT
11h 50m2 stops
$293American Airlines
Find Deal
Wed, May 29 - Tue, Jun 4
6:42 pm - 11:05 amONT-IAD
13h 23m2 stops
6:18 am - 4:36 pmIAD-ONT
13h 18m2 stops
$300Delta
Find Deal
Wed, May 29 - Tue, Jun 4
6:25 pm - 5:25 amONT-IAD
8h 00m1 stop
2:23 pm - 10:29 pmIAD-ONT
11h 06m1 stop
$339United Airlines
Find Deal
Fri, May 24 - Wed, May 29
6:25 pm - 5:25 amONT-IAD
8h 00m1 stop
7:01 am - 12:15 pmIAD-ONT
8h 14m1 stop
$346United Airlines
Find Deal
Thu, Aug 1 - Thu, Aug 8
8:20 pm - 7:30 amONT-IAD
8h 10m1 stop
7:02 am - 11:59 pmIAD-ONT
19h 57m1 stop
$426Alaska Airlines
Find Deal
Thu, Jul 4 - Tue, Jul 16
4:21 pm - 7:40 amONT-IAD
12h 19m1 stop
7:00 am - 3:26 pmIAD-ONT
11h 26m1 stop
$471Alaska Airlines
Find Deal
Thu, May 30 - Mon, Jun 3

Flights from Ontario to Dulles Intl - Travel Insights & Trends

Get data-powered insights and trends into flights from Ontario to Dulles Intl to help you find the cheapest flights, the best time to fly and much more.

What’s the cheapest day of the week to fly from Ontario to Washington Dulles Airport?

The average price of all flights from Ontario to Washington, D.C. Dulles Intl Airport clicked on KAYAK for each day over the last 12 months.
Your flight ticket price will generally be cheaper if you fly to Washington Dulles Airport on a Tuesday and more expensive on a Sunday. On your return trip to Ontario, you should consider flying back on a Tuesday, and avoid Mondays for better deals.

What is the cheapest month to fly from Ontario to Washington, D.C. Dulles Intl Airport?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for flights from Ontario to Washington, D.C. Dulles Intl Airport, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.
The cheapest month for flights from Ontario to Washington, D.C. Dulles Intl Airport is September, where tickets cost $278 on average. On the other hand, the most expensive months are December and June, where the average cost of tickets is $531 and $518 respectively.

How far in advance should I book a flight from Ontario to Washington, D.C. Dulles Intl Airport?

To calculate daily average prices, KAYAK takes all prices for each day before departure over the last year for flights from Ontario to Washington, D.C. Dulles Intl Airport, removes the top 0.1% to account for outliers, and then takes the average of all the values for each month.
To get a below average price on the flight from Ontario to Washington, D.C. Dulles Intl Airport, you should book around 2 weeks before departure. For the absolute cheapest price, our data suggests you should book 70 days before departure.

Which airlines provide the cheapest flights from Ontario to Washington Dulles Airport?

The cheapest price for the route for each airline clicked by KAYAK users in the last 72 hours.
The cheapest return flight ticket from Ontario to Washington Dulles Airport found by KAYAK users in the last 72 hours was for $287 on American Airlines, followed by Delta ($290). One-way flight deals have also been found from as low as $144 on American Airlines and from $145 on Delta.

Good to know

Low season

February

High season

April

Cheapest flight

$144
Best time to beat the crowds with an average 36% drop in price.
Most popular time to fly with an average 24% increase in price.
Flight from Ontario to Washington Dulles Airport

When to book flights from Ontario to Dulles Intl

Are your dates flexible? Find out the best times to travel from Ontario to Dulles Intl based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking Ontario to Washington Dulles Airport flights

  • What is the cheapest flight from Ontario to Washington, D.C. Dulles Intl Airport?

    In the last 3 days, the lowest price for a flight from Ontario to Washington, D.C. Dulles Intl Airport was $144 for a one-way ticket and $287 for a round-trip.

  • Do I need a passport to fly between Ontario and Washington Dulles Airport?

    No

  • Which airports will I be using when flying from Ontario to Washington Dulles Airport?

    Ontario airport is called Ontario and the only airport in Washington Dulles Airport is Washington, D.C. Dulles Intl.

  • Which aircraft models fly most regularly from Ontario to Washington Dulles Airport?

    The Airbus A319 is the aircraft model that flies most regularly on the Ontario to Washington Dulles Airport flight route.

  • Which airline alliances offer flights from Ontario to Washington Dulles Airport?

    oneworld, SkyTeam, and Star Alliance are the airline alliances operating flights between Ontario and Washington Dulles Airport, with oneworld being the most commonly used for this route.

  • Which is the best airline for flights from Ontario to Washington, D.C., Delta or Alaska Airlines?

    The two airlines most popular with KAYAK users for flights from Ontario to Washington, D.C. are Delta and Alaska Airlines. With an average price for the route of $397 and an overall rating of 8.0, Delta is the most popular choice. Alaska Airlines is also a great choice for the route, with an average price of $265 and an overall rating of 8.0.

  • How does KAYAK find such low prices on flights from Ontario to Washington Dulles Airport?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Ontario to Washington Dulles Airport.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Ontario to Washington Dulles Airport?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Washington Dulles Airport from Ontario is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Ontario to Washington Dulles Airport?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Washington Dulles Airport with an airline and back to Ontario with another airline. Booking your flights between Ontario and IAD can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Ontario to Washington Dulles Airport?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Washington Dulles Airport from Ontario up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

See more FAQs

Top 5 airlines serving from Ontario to Dulles Intl

 
See real verified KAYAK customer reviews for airlines flying from Ontario to Washington, D.C.. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Ontario to Dulles Intl? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
8.0
Alaska AirlinesOverall score based on 9128 reviews
7.9Comfort
7.3Food
8.2Boarding
7.3Entertainment
8.6Crew
Airline reviews

Honestly, there was not much they could do. Due to wind, the flight was delayed for several hours because we had to be diverted to San Jose where we needed to refuel before departing to Hawaii. Wish they had offered some snacks during the delays/diversion because we had to wait such a long time to finally get our food served during the flight after leaving California.

4.0 OkayAnonymous, May 2024SAN - HNL
Read more about Alaska Airlines reviews

Honestly, there was not much they could do. Due to wind, the flight was delayed for several hours because we had to be diverted to San Jose where we needed to refuel before departing to Hawaii. Wish they had offered some snacks during the delays/diversion because we had to wait such a long time to finally get our food served during the flight after leaving California.

They canceled the flight 30 minutes prior to departure without any heads up.

All parts were excellent, especially staff at bag tag printing and inflight crew. Just the normal differences from past air travel could be improved but we’ve learned to accept those—cramped seats, minimal food/beverage, etc.

Better organizing of entry and exit onto the plane regarding all of the baggage people haul on. There should be a better system so those with no baggage can get in and out more quickly. The baggage haul-on situation is absurd.

Attentive crew. Best of all was the empty seat between me and my rowmate.

We had a very scary attempted landing in Palm Springs and were redirected to Ontario. It was a stressful flight.

Every thing means , crew, service, timing, boarding is very good.

I really like Alaska airline, it's my favorite airline❤️

Alaska Airlines was fantastic. Kayak on the other hand was extremely poor. I got tickets through Kayak for a flight to a funeral. The date got changed less than 12 hours after I made my reservations. When I attempted to change my flights through Kayak, I was unable to use either the website or the phone system. The phone matrix did not give an option to cancel or change. The website said Kayak could not find any record of me making airline reservations through Kayak and even through I never left the Kayak website when making the reservations to my knowledge. After more than a half hour of frustration on the phone and computer ( on top of dealing with the death of a member of my family) I finally contacted Alaska Airline directly and they cancelled my flight and refunded the cost very quickly and efficiently. Alaska Airlines gets 10 stars. Kayak gets zero stars and has permanently lost a customer. I will never use Kayak again.

The WIFI didn't work well enough to get through even 5 minutes of a movie I had selected (it just kept pausing and spinning), and I just gave up and read a book. The selection of movies was a little sparse though, so reading wasn't that bad of an option. This was an older 737-800, with undersized overhead bins -- but it doesn't make sense to me that we are told to slide our bags in with the wheels facing us (most people ignore that and put the handles facing us). This makes it more difficult to remove the bags (no handle). The flight went well, and the fruit/cheese platter I pre-ordered was good -- although it is a little annoying to have to pre-order for this (but I suppose it saves time). When I pre-order it automatically gets charged to my personal credit card (Alaska VISA), when I'd prefer to use my corporate card for that on business trips.

There was a loud squeaky sound the whole time we were flying.

I didn’t not like that I could not select my seat and ended up with the worse seat.

The landing was bad and the hostess came two times and i was sleeping but when she served the person that nexts to me I woke up and she didn’t even asked me if I need any drink or snacks two times!!!!

Plane was late because of a mechanical malfunction and the food listed as available was not. Flight attendants seem over worked and under paid. They just done seem happy. And that can be seen in their faces.

Waited 3 hours on a plane to de-ice due to manpower issues. Waited another hour and a half once we landed because of a gate issue. Missed my connections. Created. A total of 13 hours of delay.

Great, on time departure, friendly and accommodating crew, great leg room, Smith flight

Plane was turned around due to fog half way into the flight, Delta did not properly direct passengers to stay on same flight and instead failed to properly rebook on Alaska

Like most domestic flights in the US, you are basically on your own with this airline when it comes to food, so be sure to purchase meals and drinks ahead of time or expect to arrive starving and dehydrated (like I was).

You need to be a hacker to get the (Free) WiFi

I guess they don’t serve drinks on planes anymore

All flights were on time and boarding was issue free

Water service would be great. The way they board is terrible. Slow passengers first😂😂 They need to smart up a bit

It got me where I needed it to; not much more. It had no competition so that was why I chose it.

Plane didn’t even make it off the ground. We all had to get off and walk to a different terminal (lots of confusion) to get on a different plane. Landed fairly late, connections missed.

Crowded flight, but upbeat and kind crew. Pilot greeted us at door, flight attendant thanked a number of “special” passengers for their business, another addressed an eight-year old boy as “young man.” United obviously trying to up their game, but though all of that is nice and notable, flying still feels like moving along a human assembly line, being herded into one small space after another (boarding areas with too few seats, planes with limited personal space, shuttles (IAD) packed too full.

It was ok until we got to DC and I wanted to use my United Club pass and the snobbish receptionist said that they don’t take one pass. It took me everything itch of patience not to tell her off

Food choice was poor and we had to buy on board snacks.

We were offer chocolate cookies , not everyone eat chocolate. Thank you

Lost luggage again. Our second trip to Mykonos, and 2nd time no luggage.

Flight was well orchestrated, made up time despite circling a bit all good on United. Travelers can just be so into themselves that common courtesy has gone out window for some, but that’s not on United.

The Flight attendant had an attitude and didn't allow anyone any time to prepare for landing despite being absent throughout the entire trip

The flight was great until towards the end when the flight attendant read an excessively long commercial for purchasing an american airlines credit card. The worst part is that we are doing a lot of traveling this year so i was actually interested in getting the credit card, but I was so annoyed with the long commercial that I completely dismissed the flight attendant bringing around the information. Next time, keep the sales pitch to 10 seconds and then pass around the brochures!!

Nice aircraft. Plane was PACKED full and distance between seats was tight. Had it been more than a two hour flight it would not have been tolerable. I had much more knee space on the JetBlue flight I went out on.

New ridiculous policy by american destroyed my allegiance to american. As a million miler with american, I expected it would be easy to get on an earlier flight when I got to airport earlier than expected, and save a five hour layover. WRONG. The online app would not let me switch flights, So I called, and was promised a call back in 90 minutes. HAH! The customer service desk at DCA said “we no longer have access to changing a flight on our screens. If the app couldn’t do it, I should send a letter to American, but there’s nothing else possible!”

I am tired of being nickel and dimed for seat location, checked luggage and carry on bags. That is why i rarely fly anymore.

It was right on time and crew were very courteous

Great flight. Boarding was efficient and quick. On time departure and smooth flight. Flight arrived early at destination. Good experience.

Literally the worst experience ever and I had my service dog with me. Flight was supposed to leave at 1:51 PM but the plane arrived late. They boarded us around 3 PM and kept us on the plane for an hour saying that due to weather conditions in Miami, we could not takeoff yet. After waiting for an hour, they deplaned. And then they will not give us our bags back that we could just leave and schedule for another flight. Every hour they kept updating saying we have to wait another hour without any explanation as to what was going on. Eventually, I went to customer service to change my ticket, but by the time I made it to the front of the line, they started boarding my flight again. And then when we got onto the flight, they said there were two flight attendants That were past their shift. They kept us on the plane for about another 40 minutes until they told us they had no other flight attendance and had to deplane again. Then I gave us hotel vouchers and told us we would be on a flight at 6 AM the next day. At this point it is about 9 PM. I get to the hotel with my dog, who hasn’t been able to go potty for about eight hours. When I arrived at the hotel, I got a text alert saying my flight has been canceled at 6 AM and they moved past to 5 AM, however the hotel shuttle doesn’t leave early enough to make it to the airport for 5 AM flight. So me and some other passengers got a cab after about three hours of sleep to get back to the airport. This was the worst experience ever.

Their computers were down upon arrival to the airport. They were unable to figure out how to board us. We were delayed over an hour and a half.

It was wonderful upgrading to first. Plane was so cold thou. Crew was great. Wish there was a food option in first for such a long flight. Doesnt matter the time of day. Chintzy.

Our flight was delayed an hour, then when we got to board our flight finally, we were waiting in our seats for take off for 45 minutes before it was communicated that there was a maintenance issue therefore we waited on the plane for over an hour while that was resolved. We did not get to Phoenix until almost 3 hours after we were originally supposed to. This was the first and last time I will be flying Frontier.

There were 3 leg for the trip and each leg was delayed by 90 minutes or more. The boarding process takes forever with people waiting on the jetway even though most folks do not have carry-on. The whole process is poorly managed.

They cancelled the flight then did nothing to help us rebook. It was awful - I won’t fly with them again

The process of buying the ticket and navigating all the hidden charges that Frontier throws at you was a terrible experience. The actual airport experience and flying was fine.

The truck that was refueling the plane drove away with the hose still connected to the plane and ripped part of the plane off with it

Terrible. Seats are bad and the baggage policy is inconsistent

Better than I expected but I did pay for a seat and carry on bags ahead of time.

I hope to avoid flying with them in the future. First flight got cancelled then got stuck with a 13 hour layover in Denver. The process was long and frustrating to many people.

Flight was delayed on the runway for 40 minutes the crew did not even offer even water to passengers to compensate for the flight delayed. The flight was delayed due to aircraft mechanical issues. Worst customer service ever

The flight was delayed and I had to cancel because I would have missed my connection and there were no other flights for the next two days. They also lost my bag!!

Book cheap flights from Ontario to Washington, D.C.

Recent one-way flight deals

 
Only flying one-way? Below are some of the best one-way flight deals from Ontario to Washington, D.C. found on KAYAK in the last 72 hours.
5/25Sat
1 stopAmerican Airlines
8h 45mONT-IAD
$144
5/31Fri
1 stopDelta
7h 33mONT-IAD
$145
7/11Thu
2 stopsDelta
13h 19mONT-IAD
$150
6/2Sun
1 stopAmerican Airlines
9h 46mONT-IAD
$178
6/4Tue
2 stopsDelta
12h 47mONT-IAD
$179
5/29Wed
1 stopUnited Airlines
8h 04mONT-IAD
$195
9/3Tue
1 stopUnited Airlines
7h 55mONT-IAD
$224
6/13Thu
1 stopAlaska Airlines
8h 10mONT-IAD
$234
6/19Wed
1 stopAlaska Airlines
8h 10mONT-IAD
$251
5/23Thu
1 stopSouthwest
8h 05mONT-IAD
$283

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Last minute flights from Ontario to Dulles Intl

Last minute flight, train and bus deals

 
These last-minute flight deals are the cheapest flights found on KAYAK in the last 72 hours for flights from Ontario to Washington, D.C. that are departing in the next 10 days.
5/8Wed
multi-stopAmerican Airlines
7h 47mONT-IAD
5/18Sat
multi-stopAmerican Airlines
9h 39mIAD-ONT
$457
5/8Wed
multi-stopDelta
7h 33mONT-IAD
5/21Tue
multi-stopDelta
7h 40mIAD-ONT
$491
5/8Wed
multi-stopDelta
7h 33mONT-IAD
5/13Mon
multi-stopDelta
7h 58mIAD-ONT
$544
5/7Tue
multi-stopAlaska Airlines
9h 04mONT-IAD
5/26Sun
multi-stopAlaska Airlines
11h 26mIAD-ONT
$546
5/8Wed
multi-stopDelta
13h 52mONT-IAD
5/18Sat
multi-stopDelta
7h 58mIAD-ONT
$556
5/6Mon
multi-stopAmerican Airlines
9h 46mONT-IAD
5/10Fri
multi-stopAmerican Airlines
10h 11mIAD-ONT
$581
5/4Sat
multi-stopAlaska Airlines
10h 44mONT-IAD
6/12Wed
multi-stopAlaska Airlines
11h 26mIAD-ONT
$583
5/7Tue
multi-stopSouthwest
8h 40mONT-IAD
5/8Wed
multi-stopSouthwest
9h 10mIAD-ONT
$630
5/8Wed
multi-stopUnited Airlines
7h 20mONT-IAD
5/18Sat
multi-stopUnited Airlines
17h 49mIAD-ONT
$680
5/7Tue
multi-stopUnited Airlines
6h 38mONT-IAD
5/8Wed
multi-stopUnited Airlines
15h 28mIAD-ONT
$718

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Ontario - Washington Dulles Airport Flights

Departure:

Ontario (ONT)United States

Destination:

Washington Dulles Airport (IAD)United States

Return flight deals:

Washington Dulles Airport - Ontario

Cabin classes: