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WAS - ONT

Find cheap flights from Washington, D.C. to Ontario from $90

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Washington, D.C. to Ontario departing on 5/18. 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
Sat 6/8
Sat 6/15

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These are the airlines KAYAK users have selected most often from within our search results in flight searches from Washington, D.C. to Ontario.
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Washington, D.C. to Ontario.
In the last 7 days travelers have searched 43,968,530 times on KAYAK, and here is why:

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Cheap flight deals from Washington, D.C. to Ontario (WAS-ONT)

Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Washington, D.C. to Ontario 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
1:03 pm - 11:39 pmBWI-ONT
13h 36m1 stop
8:27 pm - 12:03 pmONT-BWI
12h 36m1 stop
$180Frontier
Find Deal
Wed, Aug 28 - Fri, Aug 30
1:03 pm - 11:44 pmBWI-ONT
13h 41m1 stop
1:32 pm - 12:03 pmONT-BWI
19h 31m1 stop
$186Frontier
Find Deal
Sat, Aug 24 - Tue, Aug 27
2:15 pm - 10:05 pmIAD-ONT
10h 50m1 stop
5:45 am - 3:10 pmONT-IAD
6h 25m1 stop
$285United Airlines
Find Deal
Fri, Nov 1 - Sat, Nov 2
2:14 pm - 6:59 pmIAD-ONT
7h 45m1 stop
10:45 pm - 8:58 amONT-IAD
7h 13m1 stop
$287American Airlines
Find Deal
Wed, May 29 - Sat, Jun 8
5:31 pm - 11:00 pmIAD-ONT
8h 29m1 stop
10:46 am - 11:22 pmONT-IAD
9h 36m1 stop
$288American Airlines
Find Deal
Tue, Jul 30 - Wed, Aug 7
3:00 pm - 7:22 pmIAD-ONT
7h 22m1 stop
12:45 pm - 12:07 amONT-IAD
8h 22m1 stop
$290Delta
Find Deal
Tue, Sep 17 - Sat, Sep 21
6:00 am - 11:40 amIAD-ONT
8h 40m1 stop
6:42 pm - 6:25 amONT-IAD
8h 43m1 stop
$300Delta
Find Deal
Sat, May 25 - Sat, May 25
7:01 am - 12:15 pmIAD-ONT
8h 14m1 stop
1:47 pm - 12:49 amONT-IAD
8h 02m1 stop
$390United Airlines
Find Deal
Thu, Jul 4 - Tue, Jul 9
7:00 am - 3:26 pmIAD-ONT
11h 26m1 stop
10:00 am - 11:59 pmONT-IAD
10h 59m1 stop
$448Alaska Airlines
Find Deal
Wed, May 29 - Tue, Jun 4
9:05 am - 3:26 pmIAD-ONT
9h 21m1 stop
4:21 pm - 7:40 amONT-IAD
12h 19m1 stop
$475Alaska Airlines
Find Deal
Sun, May 26 - Wed, May 29

Flights from Washington, D.C. to Ontario - Travel Insights & Trends

Get data-powered insights and trends into flights from Washington, D.C. to Ontario 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 Washington, D.C. to Ontario?

The average price of all flights from Washington, D.C. to Ontario clicked on KAYAK for each day over the last 12 months.
For Washington, D.C. to Ontario, Tuesday is the cheapest day to fly on average and Sunday is the most expensive. Flying from Ontario back to Washington, D.C., the best deals are generally found on Friday, with Sunday being the most expensive.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for flights from Washington, D.C. to Ontario, 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 Washington, D.C. to Ontario is January, where tickets cost $258 on average. On the other hand, the most expensive months are June and July, where the average cost of tickets is $465 and $454 respectively.

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

To calculate daily average prices, KAYAK takes all prices for each day before departure over the last year for flights from Washington, D.C. to Ontario, 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 Washington, D.C. to Ontario, you should book around 3 days before departure. For the absolute cheapest price, our data suggests you should book 40 days before departure.

Which airlines provide the cheapest flights from Washington, D.C. to Ontario?

The cheapest price for the route for each airline clicked by KAYAK users in the last 72 hours.
In the last 72 hours, the best return deals on flights connecting Washington, D.C. to Ontario were found on Frontier ($180) and United Airlines ($285). Frontier proposed the cheapest one-way flight at $90.

Good to know

Low season

October

High season

December

Cheapest flight

$90
Best time to beat the crowds but there is an average 2% increase in price.
Most popular time to fly with an average 13% increase in price.
Flight from Baltimore to Ontario

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

Are your dates flexible? Find out the best times to travel from Washington, D.C. to Ontario 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 flights from Washington, D.C. to Ontario

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

    In the last 3 days, the lowest price for a flight from Washington, D.C. to Ontario was $90 for a one-way ticket and $180 for a round-trip.

  • Do I need a passport to fly between Washington, D.C. and Ontario?

    A passport is not required to fly from Washington, D.C. to Ontario.

  • Which airports will I be using when flying from Washington, D.C. to Ontario?

    Washington, D.C. is served by 2 major airports and there is only 1 main airport in Ontario. You will leave Washington, D.C. from one of these airports: Washington, D.C. Reagan-National or Washington, D.C. Dulles Intl. You will be arriving at Ontario.

  • Which aircraft models fly most regularly from Washington, D.C. to Ontario?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from Washington, D.C. to Ontario?

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

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

    The two airlines most popular with KAYAK users for flights from Washington, D.C. to Ontario are Delta and Alaska Airlines. With an average price for the route of $417 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 $203 and an overall rating of 8.0.

  • How does KAYAK find such low prices on flights from Washington, D.C. to Ontario?

    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 Washington, D.C. to Ontario.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Ontario from Washington, D.C. 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 Washington, D.C. to Ontario?

    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 Ontario with an airline and back to Washington, D.C. with another airline.

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

    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 Ontario from Washington, D.C. 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 Washington, D.C. to Ontario

 
See real verified KAYAK customer reviews for airlines flying from Washington, D.C. to Ontario. 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 Washington, D.C. to Ontario? 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
DeltaOverall score based on 10789 reviews
7.9Comfort
7.4Food
8.0Entertainment
8.6Crew
8.2Boarding
Airline reviews

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

6.0 GoodEliza, Apr 2024SAN - LAX
Read more about Delta reviews

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

Had a broken tray in business class. Crew just shrugged it off.

I didn’t like that I could not select my seat and was assigned a seat when I checked in at LAX

Great experience overall. Check in at Austin was congested as they only have about 6 check in kiosks, one was broken, and there was a lot of Spring Break travelers.

Bag drop off was slow and annoying. Only 2 agents at the entire delta desk, and no one directing traffic for what line to be in, many confused people slowed down the process. Boarding was fine. Seats in Delta comfort plus were fine. Snacks were great! Definitely a bonus. The entertainment system was awful — old, slow, not responsive, and completely unable to play games due to some kind of error. But on the other hand, thank you to Delta for the free WiFi. That made it better.

Everything was very good other than I had selected a specific seat when I booked the flight and they changed it once I checked-in the day before my flight. I was still in first class but lost my aisle seat for a window seat. Being tall, the aisle offers more comfort so I always select an aisle seat.

Flight diverted in SD. Later take off in Seattle by 1.3hrs

Crew was not friendly when I went to request a seat change.

Really impressive staff at airport and on plane, especially given how busy it was

Was a great smooth flight from Detroit to San Diego.

Should have video screens Plane audio was poor and without wired connection hard to understand crew. Should serve more than just cups of water and pretzels on six hour flight. Did not see crew rest of flight. Fix charging sockets to retain charging blocks.

they made me check my carryon. There was space in the overhead bins.

The plane was delayed 2 hours. The wifi did not work. The seat in first class was not comfortable because the bottom felt like it lost all of its padding. And I did not like when the flight attendant made me wait at my seat to use the bathroom and didn't tell me why. If there were too many people using the 1st Class bathroom, she should have told me to go in the back, coach bathrooms. I guess I have to feel fortunate that they found 2 local pilots to still fly the plane tonight after the original pilots ended up at an airport 60 miles away due to high winds.

The crew were really great, but the 4 hour delay in small chunks was the worst.

Airline did not explain reasons why flight was delayed two hours. Explanations were badly needed and rarely provided. Problem seemed to clearly be the airline’s fault and not the fault of the weather or airport.

Just a crappy airline. The same every time. You feel you are a cow on a farm. You are being being whipped and pulled.

Wasn’t very crowded. Seamless processes. No issues traveling with two little kids.

My interaction with the flight attendent Eve was horrible. I was seated in 3F and was blown away watching her repeatedly skip me as she took other customer orders for lunch...she took the customer next to me but skipped me, then took everyone's order around me (in front of and behind me) . After she had taken every customer's orders to include those behind me, she came to me and said we are out of everything except one last item. I was mortified, in that, I am a 1k flyer, had pre-ordered AND as an African American could only assume why she repeatedly skipped me...mortified. no words

The Flight was good, pilot seemed very skillful. My wheel chair sister who could barely walk was allotted the second last seat in the aircraft, with great difficulty she managed to reach on her seat, as she required attendance we were given separate seat, even on request no one cared, so much so there were single passengers who were given twin seats. May not be taken as complaint but a reminder to the checkin staff to keep in mind in future the allottment of wheel chair passengers seats.

Almost 2 hour delay in boarding with all standing ready to board at original time. No explanation given.

Overall the flights pretty good. The snacks we’re good and they were plenty of them. Both boarding and deplaning went quickly.

Delayed abs delayed Gate crew giving poor info - we are definitely leaving at —- Ultimately to cancel flight after 4+ hours of delays Just cancel it earlier

The flight was scheduled to depart DCA at 12:30 pm but was delayed twice on the ground so that we were finally scheduled to depart at around 4:00 pm. Once we boarded, it was announced that takeoff would be delayed again to fix a hydraulic problem which delayed our eventual takeoff until around 5:00 pm. Once we departed, it was a smooth flight back to ORD. We did not get any explanation about what caused the original significant delay. In my experience, this happens frequently with AA.

Lots of weather delays that were poorly communicated and managed. I get there are weather delays but they didn’t make it clear what was happening or comfortable on the plane

Everything was on time; the flight attendants and the gate personnel were very pleasant and helpful.

Our second leg to Jackson WY was unable to land due to weather. We were flown back to Dallas after stopping in SLC. We were given hotel rooms and vouchers. We were told that we would be back on the same plane in the morning. Instead we were given a different flight with different seats. Not a good experience. No one knew what was going on.

Perfect flight. On time departure and early arrival. Smooth flight.

Awful! The flight was delayed and we sat on the plane in DCA for an hour because fuel was out in the wrong part of the plane and would not be accessible during flight. So the plane had to be refueled in correct tank. They also allowed someone to get off of the plane. This delayed my six hour flight by an hour and made me miss my connecting flight. I ran to new gate and American Airlines agents new about the delay and even knew that I was trying to make the connection. They knew thru communication with my friend while in flight that I was in the airport and running to the new gate and they still closed the gate and refused to let me on the new flight despite plane still being at the gate. It was horrible and I had to be rebooked on a flight for 24 hours later. This has been a nightmare and if American Airlines can cause customers to be delayed and then have zero empathy as having an on time flight was more important to them than helping a customer who was delayed by no fault of her own, then it's seems that it's not a company that I want to continue to give my loyalty to. I'm so disgusted.

Help was available but timing was bad in my case

It was a horrible snow storm, but updates were inconsistent and the app never displayed a remotely accurate time or gate until very close to boarding.

The guy with severe body odor sat next to me. For the whole duration of the flight it was a torture. The airline should have better policy on limiting people with bad body odor to board the flight. Passengers should not be the ones to endure bad odor for the whole duration of the flight. The airline should be e the one to ensure decent air quality for ever passenger.

They charged me 212.00 for a heavy check in bag at the gate. The pricing and process was so confusing - as if it was designed to purposefully gouge customers who need to board plane. That experience combined with the outrageous price charged will prevent me from ever flying Spirit again. And I’ll be sure to tell the story to anyone who cares to hear.

The text told me it was changed to Terminal E and Gate D5. But with no one on site to ask questions there was confusion on where to go as all the gates were E's. Then we took the skyline to the D area. We left to get something to eat. No announcement was made but my daughter happened to asked and they told her our gate was moved to D12. I will not fly Spirit again.

The agent at the check in desk was absolutely rude. The rest of the team after that was good, but the check in process at LAS was miserable. The woman at the desk spoke like we were stupid and was rude throughout the process.

Its so random that they only allow 40 pounds on checked bags when all airlines take 55. They then charge you for each 10 extra pounds, so my checked suitcase was $130 and the flight $30 ... its like whattt, im for sure not traveling with Spirit again

So bad. The check in process was laborious and the check in agent didn't seem to know how to manage the process efficiently and was confused about how to check in my son's sports equipment. The baggage fees were outrageous and so expensive. $90 for a carry on bag? And $200 additional for 2 check ins. The security lines were insanely long and the terminal was not very nice in the Spirit area. $5 for a water on board. It was my first and last time flying Spirit - I tried to save $ by flying them due to the accommodating schedule but I should have paid for Southwest, because it would've actually ended up less expensive due to the free bags with Southwest. There were no charging ports on the airplane, no wifi and really uncomfortable seating. The flight crew were great though, courteous and efficient in their boarding. Flight was delayed 1 hour, but we made up 15 minutes in flight.

My experience was better than expected. What I did find not so great was the seats. Very little room, they did not recline and the tray table was the size of a post card. There was no food to try, just standard snacks that you had to pay for and I don’t know of any entertainment. I would fly again even though everything was an upcharge. Flight was on time with little disturbance

thy don't even ofer water we have to buy it for $4.49 and paid for our cary on bags $100 each we never will fly in this company again.

Super cool and laid back, three lovely ladies. Couldn’t ask for better service.

It was fine. Boarding was a little rude. On flight staff was great. The cost to purchase everything was a bit annoying but I get that's the business model.

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

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

The boarding time. I was in Section 1 the lady in charge just let people in section 3 without see us. Make a line , I have to step out and ask her. We were in the line and she just take my ticket and that’s it, so if I don’t ask her she could leave us at the end! We paid more for that privilege and. She doesn’t care….

See my previous comment which is mostly about our flight from Phoenix to SFO

The check in at the airport was awful. Told I need to pay for a bag. The item was taken at screening. I went back to get my $ back and they gave me a coupon with a QR code that doesn’t work. Worst costumer service ever!!!!!

4 hour delay because they used our aircraft to fly a different segment (per the captain)

Lost baggage on my connecting flight. 24 hours later, still no update on my bags.

I had to cancel within 1hour of the reservation an they put you through hell to . no live customer service desk. I'm handy caped and they make it almost impossible to cancel. They are steeling my money. You should not have that airline on your site. Contact me and I will give you all info. Of what the are doing to me just notable treatment they are set up like that to take people

It’s a cheap airline. I wish they had better seats.

Seats are cramped and very uncomfortable. You have to pay for everything and it is too expensive.

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

Recent one-way flight deals

 
Only flying one-way? Below are some of the best one-way flight deals from Washington, D.C. to Ontario found on KAYAK in the last 72 hours.
5/18Sat
1 stopFrontier
8h 13mBWI-ONT
$90
8/21Wed
1 stopFrontier
9h 34mBWI-ONT
$93
8/13Tue
1 stopDelta
7h 53mIAD-ONT
$145
6/8Sat
1 stopDelta
7h 20mIAD-ONT
$150
5/29Wed
1 stopAmerican Airlines
7h 45mIAD-ONT
$153
7/2Tue
2 stopsAmerican Airlines
11h 27mIAD-ONT
$158
8/29Thu
1 stopUnited Airlines
9h 36mDCA-ONT
$195
5/30Thu
1 stopUnited Airlines
8h 45mIAD-ONT
$195
6/5Wed
1 stopAlaska Airlines
11h 26mIAD-ONT
$221
5/30Thu
1 stopAlaska Airlines
11h 21mBWI-ONT
$224

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Last minute flights from Washington, D.C. to Ontario

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 Washington, D.C. to Ontario that are departing in the next 10 days.
5/11Sat
multi-stopFrontier
20h 31mBWI-ONT
5/17Fri
multi-stopFrontier
13h 47mONT-BWI
$269
5/14Tue
multi-stopFrontier
14h 35mDCA-ONT
5/23Thu
multi-stopFrontier
29h 44mONT-DCA
$269
5/9Thu
multi-stopDelta
8h 40mIAD-ONT
5/30Thu
multi-stopDelta
8h 05mONT-IAD
$467
5/9Thu
multi-stopDelta
8h 58mIAD-ONT
6/1Sat
multi-stopDelta
13h 52mONT-IAD
$472
5/10Fri
multi-stopAlaska Airlines
10h 19mIAD-ONT
5/29Wed
multi-stopAlaska Airlines
22h 40mONT-IAD
$533
5/10Fri
multi-stopUnited Airlines
7h 25mIAD-ONT
5/28Tue
multi-stopUnited Airlines
8h 04mONT-IAD
$557
5/12Sun
multi-stopAmerican Airlines
10h 11mIAD-ONT
5/16Thu
multi-stopAmerican Airlines
9h 46mONT-IAD
$581
5/14Tue
multi-stopAlaska Airlines
11h 05mDCA-ONT
5/15Wed
multi-stopAlaska Airlines
8h 44mONT-DCA
$584
5/11Sat
multi-stopAmerican Airlines
9h 21mDCA-ONT
5/19Sun
multi-stopAmerican Airlines
9h 30mONT-DCA
$586
5/11Sat
multi-stopUnited Airlines
7h 40mBWI-ONT
5/28Tue
multi-stopUnited Airlines
17h 05mONT-BWI
$677

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Flights to Ontario

Destination:

Ontario (ONT)United States

Return flight deals:

Ontario - Washington, D.C.

Cabin classes: