ONT - WAS

$84 Find Cheap Flights from Ontario to Washington, D.C.

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 Washington, D.C. departing on 7/21. 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
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Washington, D.C.

 
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
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Everything you should know

Cheapest round-trip
$240
Typical prices: $537-$369
Frontier
Thu 8/6Sat 8/22
ONT - BWI • 1 stop
Cheapest non-stop
$469
Southwest
Tue 7/14Tue 7/21
ONT - BWI • Non-stop
Top airlines
Cheapest • from $240 (round-trip)
Best reviews • 7.9 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Top layover airports
Cheapest • Avg $223 (round-trip)
Shortest trip • 6h 20m (one-way)
Insights
Insights
Insights
Insights
Top routes
Cheapest
Most popular
Insights
Insights
Insights
Insights
When to travel
Cheapest • 54% price drop
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
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We hope you love your trip to Washington, D.C.!
Flight Deals
Booking Insights
Flight Deals

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

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Ontario to Washington, D.C. 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 for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Ontario to Washington, D.C.

Thu, Aug 6 - Sat, Aug 22
Frontier Logo
9:36 am - 8:39 pm
ONT
-
BWI
8h 03m
1 stop
Frontier Logo
5:44 pm - 5:52 pm
BWI
-
ONT
27h 08m
1 stop
$240Frontier
Thu, Aug 6 - Mon, Aug 10
Frontier Logo
9:36 am - 8:39 pm
ONT
-
BWI
8h 03m
1 stop
Frontier Logo
4:44 pm - 7:32 am
BWI
-
ONT
17h 48m
1 stop
$241Frontier
Tue, Aug 4 - Fri, Aug 7
Frontier Logo
9:32 am - 8:36 pm
ONT
-
BWI
8h 04m
1 stop
Frontier Logo
4:44 pm - 7:32 am
BWI
-
ONT
17h 48m
1 stop
$242Frontier
Sat, Jul 11 - Sat, Jul 18
Frontier Logo
9:32 am - 8:36 pm
ONT
-
BWI
8h 04m
1 stop
Frontier Logo
4:44 pm - 7:32 am
BWI
-
ONT
17h 48m
1 stop
$244Frontier
Thu, Jul 30 - Fri, Aug 7
Frontier Logo
9:32 am - 8:36 pm
ONT
-
BWI
8h 04m
1 stop
Frontier Logo
4:44 pm - 7:32 am
BWI
-
ONT
17h 48m
1 stop
$246Frontier
Tue, Sep 1 - Wed, Sep 2
Southwest Logo
5:45 am - 6:00 pm
ONT
-
DCA
9h 15m
2 stops
Southwest Logo
4:50 pm - 10:00 pm
DCA
-
ONT
8h 10m
2 stops
$265Southwest
Tue, Aug 25 - Wed, Sep 2
Delta Logo
6:00 am - 4:44 pm
ONT
-
DCA
7h 44m
1 stop
Delta Logo
6:00 am - 10:42 am
DCA
-
ONT
7h 42m
1 stop
$280Delta
Tue, Oct 13 - Fri, Oct 23
Delta Logo
10:59 pm - 9:11 am
ONT
-
IAD
7h 12m
1 stop
Delta Logo
5:30 pm - 10:14 pm
IAD
-
ONT
7h 44m
1 stop
$280Delta
Wed, Jul 22 - Tue, Jul 28
Multiple Airlines Logo
6:00 am - 12:51 pm
ONT
-
DCA
27h 51m
1 stop
Multiple Airlines Logo
5:16 pm - 11:52 pm
DCA
-
ONT
9h 36m
1 stop
$297Multiple Airlines
Mon, Aug 31 - Tue, Sep 1
Southwest Logo
5:15 am - 4:25 pm
ONT
-
DCA
8h 10m
2 stops
Southwest Logo
1:30 pm - 10:05 pm
DCA
-
ONT
11h 35m
1 stop
$299Southwest
Booking Insights

KAYAK's insights & trends for Ontario to Washington, D.C. flights

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

How much is a round-trip flight from Ontario to Washington, D.C.?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Ontario to Washington, D.C. departing in August.

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

Data is based on round-trip flight searches on KAYAK over the past month.

The cheapest return flight from Ontario to Washington, D.C. costs $432 on the route between Ontario (ONT) and Baltimore (BWI). It is also the most popular route.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Ontario to Washington, D.C., 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. is July, where tickets cost $68 (return) on average. On the other hand, the most expensive months are February and April, where the average cost of round-trip tickets is $221 and $221 respectively.

Can I save money by flying with a layover from Ontario to Washington, D.C.?

The average round-trip price for all non-stop flights, flights with one layover, and flights with two layovers for the route found by users searching on KAYAK in the last 2 weeks.

Yes, flying with a layover may cost you more time, but you can also save money on the route, with a 1 stop layover the cheapest option at $516 on average.

Good to know

Low seasonJanuary
Cheapest flight$84
Best time to beat the crowds with an average 44% drop in price.
Most popular time to fly and prices are also 17% lower on average.
Flight from Ontario to Washington Dulles Airport

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

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

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

    In the last 5 days, the lowest price for a flight from Ontario to Washington, D.C. was $84 for a one-way ticket and $240 for a round-trip.

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

    No

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

    When flying out of Ontario you will be using Ontario. You will be landing at one of these airports: Washington, D.C. Reagan-National or Washington, D.C. Dulles Intl.

  • Which airlines offer Wi-Fi service onboard planes from Ontario to Washington, D.C.?

    Alaska Airlines, JetBlue, Delta, and Hawaiian Airlines offer inflight Wi-Fi service on the Ontario to Washington, D.C. flight route.

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

    The Boeing 737 MAX 8 is the aircraft model that flies most regularly on the Ontario to Washington, D.C. flight route.

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

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

  • On which days can I fly direct from Ontario to Washington, D.C.?

    There are nonstop flights from Ontario to Washington, D.C. on a daily basis.

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

    The two airlines most popular with KAYAK users for flights from Ontario to Washington, D.C. are Southwest and Delta. With an average price for the route of $462 and an overall rating of 7.9, Southwest is the most popular choice. Delta is also a great choice for the route, with an average price of $478 and an overall rating of 7.9.

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

    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, D.C..

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

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

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

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

    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, D.C. from Ontario up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

KAYAK’s top tips for finding a cheap flight from Ontario to Washington, D.C.

  • Looking for a cheap flight? 25% of our users found flights on this route for $188 or less one-way and $503 or less round-trip.

Reviews of the top 5 airlines serving from Ontario to Washington, D.C.

 
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 Washington, D.C.? 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.
7.9
SouthwestOverall score based on 4235 reviews
7.0Food
8.1Boarding
8.6Crew
8.0Comfort
7.5Entertainment
Airline reviews

Was fine, delayed and feels like southwest is always late

6.0 GoodAnonymous, Jun 2026
SMF - LAS
Read more Southwest reviews

Was fine, delayed and feels like southwest is always late

The entire experience from boarding to landing was amazing! The crew were very friendly. Will definitely be back.

Delayed flight, lack of information, boarding process is a mess as is the carryon luggage causing issues when leaving the plane….just a poor experience.

Comfortable. Easy. No problems. Just wish they had gf options for snacks.

The crew was very kind and made going to Hawaii relaxing and fun to look forward to! Thank you Southwest for a pleasant flight!

Terrible. Even though there’s assigned seating now, they are still the slowest boarding airline of anyone.

It was good from LAX to Phoenix, But the connection in Phoenix to Tulsa was not that great. The staff on both flights were great. The choice of free entertainment was ok nothing to brag about. The 45 min delay because of some electrical issue wasn't great from Phoenix to Tulsa. We sat there with hardly any air, The seat I had was between windows so the side of the plane pushed in on you. My being a bigger man it then made the seating area uncomfortable. The seats on the plane had no power to connect to recharge your phone or anything. I would recommend that they should look into a slot or clamp to hold your phone to enjoy while watching the entertainment choices hands-free. Also make it possible to raise the inner seat by the window be able to raise the arm rest up to make more room for larger people to set more comfortably. I would also say other then that stop price gouging the airfare or nickel and diming everything. Not fair for people having to fly for emergencies and be paying for higher prices due to the season or holidays. Your making your money either way and the cost of flying is still going to be the same regardless if there's 100 people or 200 people.

Southwest was greaat! The most expensive but the least upsetting for those we were flying to see.

Boarding was easy. The seats are small and fairly uncomfortable

The problem with the seat assignments is that there were a lot of rows in the front that were empty but my row at the back was full. Just not so pleasant.

Flight delayed four separate times. I’m now one hour hours late to landing.

Checkin was good, fllight ws good. Onlly complaint is lack of foot on 6 hour flight from Seattle to Boston. Snacks were flimsy - chips and cookies. could have offered something more substantial for such a long flight. I know you can buy food in airport but for the price you pay for a ticket, they should step up for the passengers.

Long story short, it was one of the better flight experiences I've had in some time when compared with other airlines.

While they turned off most cabin lights to allow people to sleep, I was bothered by how bright the side lights still were. It was still quite bright for me in a window seat, when I wish I could have slept!

The flight was smooth, the crew was great but the plane was quite old

Generally on time departures and arrivals, clean planes, sky miles membership provides great benefits (complimentary upgrades, etc).

N Everything was perfect from boarding to assistance to baggage in Tampa

Loved the crew! Sucks that we went from 1 hour and 8 minute layover to a 3 hour layover. But weather sucks like that.

Fast, lovely scenery, great info on the Delta flight screen about landmarks we were flying over. Great landing!

Long flight but comfortable and not freezing as I have experienced on Hawaiian flights to the islands. They gave us blankets just in case. Nice touch.

Our flight was delayed 2.5 hours from Lisbon to DC so we missed our connection to Seattle that would have arrived at about 9 PM. The agent initially said we had to stay overnight in DC and there were no other options to put us on to get us to Seattle. While on board I discovered a flight via American he could have put us in but by the time we arrived in DC that was sold out. We were then put on a flight to San Francisco that was also delayed then arrived in San Francisco and our flight to Seattle was also delayed so we ended up not arriving until 2:15 am. Our son could not pick us up so we ended up having to pay over $100 to Uber home. This is the second trip with United that the flight has been delayed causing us to miss an evening in Las Vegas and we were given nothing.

Seat pitch is horrible especially on the 15 hour flight. Gate crew at SFO was Outstanding. The flight crew was also great.

MY FAMILY'S LUGGAGE WAS LOST FROM ROME TO BARI. I WAS THE ONLY ONE THAT RECEIVED MY LUGGAGE FROM ROME TO BARI. AFTER DEPLANING IN BARI, WE WASTED A LOT OF TIME AT BAG CLAIMS LOST AND FOUND REPORTING THE CLAIM AND PLEADING FOR THE BAGS TO BE DELIVERED THE NEXT DAY. WE WERE TOLD THAT IT TAKES 3 DAYS MINIMUM TO DELIVER. MY DAUGHTER AND MY GIRLFRIEND NEEDED THEIR PERSONAL THINGS AND WE WERE STAYING 3 HOURS AWAY FROM THE BARI AIRPORT. WE HAD TO DRIVE 3 HOURS TO THE AIRPORT TO COLLECT OUR LOST LUGGAGE THE NEXT DAY. WE ARE NOT HAPPY WITH THE EXPERIENCE

There were no facilities in the middle of the aircraft and premium economy was not allowed to use the business class facilities, and had to share the only two toilets at the back with economy. The upgrade to Premium was definitely not worth it

Our flight to Rome, Italy was cancelled the day of and we were never informed. We only found out because I was trying to get into my husbands account and called to get his account number. Had to pay more for worse seating on another airline.

The economy seat was much less comfortable for an international flight in terms of recline and moving space when food tray is expanded. Per entertainment, it would be amazing if I could connect my Bluetooth headset or ear phones to the entertainment screen. Or provide in-flight wifi to connect directly from my own device.

We were a little disappointed to not be able to complete check in online without uploading pics of passports. Also we have KTN's and they weren't on our boarding passes when we got to security. Had to trek back to counter to have them fix.

Excellent service in Polaris class IAD to ZRH. Arrived rested and well fed after the overnight flight.

It's a short hop. My carryon was checked at the gate, I didn't have to drag it all over the airport. Excellent wheelchair assist.

Was great in general, try to respect time and excuses when slight changes have been made, appreciated!

Ontario airport boarding was very easy to park and access, is clean and TSA took 10 minutes total. Check-in was a breeze and cruise was very nice.

The airplane was an old model, the overhead didn’t have enough room for people’s items and made boarding and boarding disappointing and stressful. Crew allowed passengers to bring more than the permitted baggage sizes.

Good flight, seated and had a water within 5 minutes. Crew was hospitable.

It was great. Smooth flight, comfortable, left on time and landed on time.

Horrible experience upon landing. Probably more due to DCA utter incompetence than AA.

Easy boarding. Rows are smaller but that may be an older and bigger me now :)

Flight has been delayed every time I've ever taken it. Seats uncomfortable. Children behind me yelling the entire flight. Some of this is out of their control but overall just consistently not a great experience.

Poor communication ahead of time about flight delays and old planes/other equipment.

Never going to fly your airline again if it can be avoided.

Not to have gotten delayed by 2+ hours for the fourth straight American flight. They're the worst.

There weren't enough employees at check in took awhile to get bags checked. There wasn't a wheel chair for me, I was sent to someone who turns out to work for a different airline, if My flight hadn't been delayed I probably would have missed my flight as it was, by the time I arrived at my gate, they started boarding in about 15 minutes. I don't know who took me to my gate, definitely was not the normal people who take passengers to the gate. I'm guessing she may have been in a management position. I wish I knew her name, she went beyond to help me. With that said everyone was kind, and were doing the best they could. So, I choose to say it was an Adventure, stressful start, but good. In the end went well. The situation was not only difficult for passengers but the employee's.

They didn’t offer a water, even after I asked

There's no seats that lean back with little leg space i wad uncomfortable the entire flight. Your charges for extra baggage is despicable and costly!!

Remind customers of the need to have passport or new ID for boarding.

The flight never took off and we spent 7 hours at the airport

There was no food and no entertainment, so I'm not sure why these are even in the survey, as my understanding is frontier does not ever offer food without a few, not even a snack, and there are no screens so unless the flight safety talk is our entertainment why ask how we liked it?. One of the flight attendants say in the back of the plane as people filed in to their seats, yelling orders about where to put baggage and telling people to hurry up. It was the least professional experience I've ever had on a flight.

It was ok. It was expensive to check 2 bags ($75.00 per bag), and then it took a long time to wait for shuttle to take us from one terminal to the terminal where the plane was taking off at LAX. And all of this for a flight where we had to pay for any food or drink that was not water.

When I wanted to check in 3 hours prior to boarding time, the employees mentioned “a little over an hour delay” so I waited for an hour then I went to go look for food in the terminal and most people from that flight were in the same area looking for food. Finally I decided after food to check to see if it’s anytime closer and now it’s 2 mins until boarding closes?! What are you kidding me? I didn’t receive anything via sms about boarding now nor via email or on the intercom. I luckily made it through, barely, and then there’s no room for my carry on mind you I’m in the very first row so I had to place my purse in one further row back and my carry on sections down. Not sure who pays for better seats to get your stuff placed all over the plane but that was the worst experience I’ve ever had flying with anyone.

This airline sucks. They offer low rates then charge you for everything, the app does not work well, the seats are the most uncomfortable. Maintenance issues on the flight, and you still have to sit through their credit card commercials. People are nice enough but does not make up for overall poor experience.

The worst. We never made our connection and they did absolutely nothing to help us at the airport.

Everything you need to know for your flight from Ontario to Washington, D.C.

Information on your arrival and departure airports