$65 Find Cheap Flights from Ontario to District of Columbia

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 District of Columbia departing on 4/13. 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 District of Columbia

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Ontario to District of Columbia, 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 District of Columbia, as well as popular online travel agencies
Travelers love KAYAK
41,299,237 searches in the past 7 days on KAYAK

Save 23% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Bundle and saveSave money when you bundle your flight + hotel.

Filter your dealsChoose cabin class, free Wi-Fi and more.

Flight Deals
Booking Insights
Flight Deals

Book Cheap Ontario to District of Columbia Plane Tickets

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Ontario to District of Columbia 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 District of Columbia

Tue, Mar 3 - Tue, Mar 10
Frontier Logo
8:40 am - 9:59 pm
ONT
-
DCA
10h 19m
1 stop
Frontier Logo
8:00 am - 11:59 pm
DCA
-
ONT
18h 59m
1 stop
$185Frontier
Thu, Mar 5 - Wed, Mar 11
Frontier Logo
6:05 am - 4:59 pm
ONT
-
DCA
7h 54m
1 stop
Frontier Logo
6:00 pm - 11:59 pm
DCA
-
ONT
8h 59m
1 stop
$188Frontier
Mon, Mar 2 - Wed, Mar 4
Frontier Logo
6:10 am - 4:59 pm
ONT
-
DCA
7h 49m
1 stop
Frontier Logo
2:00 pm - 9:34 pm
DCA
-
ONT
10h 34m
1 stop
$194Frontier
Mon, Mar 2 - Wed, Mar 4
Frontier Logo
6:10 am - 4:59 pm
ONT
-
DCA
7h 49m
1 stop
Frontier Logo
2:00 pm - 9:34 pm
DCA
-
ONT
10h 34m
1 stop
$195Frontier
Fri, May 8 - Sun, May 10
Frontier Logo
5:33 pm - 1:00 pm
ONT
-
DCA
16h 27m
1 stop
Frontier Logo
1:59 pm - 7:31 am
DCA
-
ONT
20h 32m
1 stop
$199Frontier
Wed, Mar 11 - Wed, Mar 18
Southwest Logo
6:25 am - 3:55 pm
ONT
-
IAD
6h 30m
1 stop
Southwest Logo
5:50 am - 9:55 am
IAD
-
ONT
7h 05m
1 stop
$297Southwest
Wed, Apr 15 - Tue, Apr 21
Alaska Airlines Logo
6:00 am - 5:40 am
ONT
-
IAD
20h 40m
1 stop
Alaska Airlines Logo
7:11 pm - 9:45 am
IAD
-
ONT
17h 34m
1 stop
$303Alaska Airlines
Wed, Apr 15 - Tue, Apr 21
Delta Logo
11:53 am - 11:55 pm
ONT
-
IAD
9h 02m
1 stop
Delta Logo
11:04 am - 10:37 pm
IAD
-
ONT
14h 33m
2 stops
$308Delta
Wed, Mar 11 - Wed, Mar 18
American Airlines Logo
7:59 pm - 8:48 am
ONT
-
IAD
9h 49m
2 stops
American Airlines Logo
6:00 am - 1:48 pm
IAD
-
ONT
10h 48m
1 stop
$312American Airlines
Wed, Apr 15 - Tue, Apr 21
Delta Logo
5:55 pm - 9:15 am
ONT
-
IAD
12h 20m
2 stops
Delta Logo
11:04 am - 10:37 pm
IAD
-
ONT
14h 33m
2 stops
$313Delta
Booking Insights

KAYAK's insights & trends for Ontario to District of Columbia flights

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

What is the cheapest Ontario to District of Columbia flight route?

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

The cheapest ticket to District of Columbia from Ontario found in the last 72 hours was to Baltimore, at $388 round-trip. The most popular route is from Ontario (ONT) to Baltimore (BWI), and the cheapest round-trip airline ticket found on this route in the last 72 hours was $388.

What is the cheapest month to fly from Ontario to District of Columbia?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Ontario to District of Columbia, 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 District of Columbia is January, when tickets cost $223 (return) on average. On the other hand, the most expensive months are December and February, when the average cost of round-trip tickets is $611 and $588 respectively.

How far in advance should I book a flight from Ontario to District of Columbia?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Ontario to District of Columbia, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from Ontario to District of Columbia, you should book around 4 weeks before departure, which saves you about 51% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 23 weeks before departure.

Good to know

Low seasonJanuary
Cheapest flight$65
Best time to beat the crowds with an average 39% drop in price.
Most popular time to fly and prices are also 19% lower on average.
Flight from Ontario to Reagan Washington National Airport

FAQs - booking District of Columbia flights

  • How does KAYAK find such low prices on flights from Ontario to District of Columbia?

    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 District of Columbia.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Ontario to District of Columbia?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from Ontario to District of Columbia 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 District of Columbia?

    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 from Ontario to District of Columbia with an airline and back with another airline.

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

    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 from Ontario to District of Columbia up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

  • How many flights are there between Ontario and District of Columbia per day?

    Each day, there are between 1 and 2 nonstop flights that take off from Ontario and land in District of Columbia, with an average flight time of 4h 40m. The most common departure time is 9:00 pm and most flights take off in the evening, while the most flights land at Baltimore. Each week, there are 8 flights. The most frequent day of departure is Saturday, when 25% of all weekly flights depart. The fewest flights depart on a Friday.

Reviews of the top 5 airlines serving from Ontario to District of Columbia

 
See real verified KAYAK customer reviews for airlines flying from Ontario to District of Columbia. 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 District of Columbia? 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
SouthwestOverall score based on 4284 reviews
8.1Boarding
7.0Food
8.6Crew
8.0Comfort
7.5Entertainment
Airline reviews

The seats are now more narrow. I paid for front row the seats in the front are even more narrow than before.

2.0 MediocreDavid, Feb 2026
SAN - LAS
Read more Southwest reviews

The seats are now more narrow. I paid for front row the seats in the front are even more narrow than before.

The wifi on the plane is great. The only issue that I have is that I prefer an aisle seat and on my trips this week, I was either in the middle or window. If we can work to secure aisle seating, I will be thrilled. Nice trip.

Great flight but super high price. Glad it was a business trip and not personal

3 hour delay. Had to change plans and was still delayed.

We got exit row seats both flights. Everything was running on time

The boarding and seat assignment system no longer works for me, but I know it is being replaced. Otherwise, I am good with the overall experience.

The lead steward kept singing about "San Francisco" and hotel California---more annoying than humorous....needs work. Flight was smooth and on time.

San Diego airport is brand new, spacious, airy and very smooth checkin at SW baggage drop.

Crew could have been friendlier, maybe I'm spoiled by SW crews. In flight wifi was good. Would be nice to have more food offerings on a 4 plus hour flight

Ever since Southwest starting charging for bags, passengers don't want to pay to check their bags, so the gate agents have to beg people to check their roller bags now because there's "not enough space". This was a terrible business move by Southwest.

The plane was an older model, so it wasn’t as comfortable as others. The flight attendants were not helpful during onboarding. It was a full flight so there was chaos finding space for baggage.

Awesome! On time flight, early arrival, and a complimentary upgrade!

Delta One is extraordinary. I fly business when somebody hires me. I just wonder why there is such a chasm between business class and the insanely inhumane and nonsensical coach. The seats are not large enough to fit even my tiny wife. We fly 10% of what we did because we don’t want to pay 5-10 k but for $400 it’s unbearable. It seems like the accountants took over and made stupid decisions. Screw in 20 extra seats and make it so unbearable that people fly 90% less. Just put the damn price up and put some proper chairs in. But business, yay.

Delta’s staff is unmatched. From the gate agents, to the pilots, to the flight attendants… all top of the industry.

Flight was delayed several times. At one point, they "pulled back" 15 minutes from the delayed boarding and sent a text saying we would board sooner than previously advised. The flight then was delayed again. And when we boarded, there was an unspecified technical issue which had us waiting in the plane for about an hour.

The flight was delayed for about 2 hrs. Other than it, it was good.

I am extremely disappointed that delta internal pilot manuals now refer to the Gulf of Mexico as the “gulf of America”. You can bow down to the Orange turd on your own. I will never fly delta again

No lunch on a x-country flight scheduled for 10:50 am departure, arrived 5+ hrs later. That requires a black box label before you pay for the tickets. Worst, when I checked in online, it's specifically said that lunch was served on his flight for economy Plus passengers.

Our flight from SFO to MSP was right on time on 11/15/2025. No delays. As we approached MSP at about 8 pm, we circled in the air until 8:40 pm so I don't call that efficient for MSP. I think the captain should announce the delay and why. (as if we all don't know that we are just circling around the area, slowing down, speeding up, slowing down.) Thank you. Marilyn Fischer

Staff were friendly and happy. Delta could make sure passengers that don't have the app know of changes. Without Kayak I would not have known about the change of gate or the delay. Kayak was faster to notify me.

Very disappointing given gate agent behavior. Filed a formal complaint with United.

Crew was great (professional, attentive, prompt). Snacks for 4 hrs flight is deplorable.

Flight delayed. WiFi connectivity very poor if not existant. Last minute arrival forced me to run to catch my connection.

Terrible. No customer service, no food, no drinks on a 6 hour premier economy booking.

Fine not above and beyond as I had a connection that was delayed due to maintenance

Bad food, bad service, cold cabin with no additional blankets when asked for (they told me they don’t provide additional blankets). I’m a frequent traveler and this is one of the worst companies I traveled with (by the way I thought that I booked my ticket with Lufthansa but I didn’t see that the flights were handled by United).

It was a pretty standard flight... until the almost hour and a half spent on the taxi way. I get that the weather has been poor but the delay had nothing to do with the weather and more to do with a plane with several issues tying up the gate. I get that that happens from time to time but this has been EVERY flight I've been on for the past 5 years and I fly 3 to 5 times a year. This isn't just United... it's American, it's Delta. It's an issue with the entire industry. I work for UPS and packages on a cargo plane get better service than people do these days. Anymore I HATE flying.

Unfortunately weather delayed our flight waiting for our plane to arrive and due to a little snow time was needed to deice the plane so departure was very delayed and I missed the connecting flight

The flight crew where really good. Better then the crew from BNE to SFO

Miserable. They moved my seat, but canceled the next leg of my flight. I resolved the issue at my transfer, but that resulted in lost luggage that has taken days off my schedule with no resolution. Worse, they fail to interface effectively with Lufthansa, forcing me to bounce between two equally useless help desks. The apps are unable to handle the situation, the bag dropped off the tracker, and while the call centers are polite, they do not provide written information to assist with cross-airline communication.

The flight was on time/early, attentive crew, and everything overall went smoothly. Disappointed that WIFI was not working for the flight.

Concern Regarding Significant Gate Delay and Jet Bridge Issue Dear Customer Relations Team, I am writing to express my disappointment with the experience I had on my recent flight AA 2414 on Sunday January 18, 2026. What should have been a routine departure turned into a frustrating and avoidable delay due to an issue with the jet bridge at the gate. As a result, the flight was delayed by approximately 90 minutes while multiple gate changes were attempted. The lack of clear communication during this period made the situation even more challenging. Passengers were left uncertain about the cause of the delay, the expected timeline, and the next steps. This not only disrupted travel plans but also created unnecessary stress for everyone on board. I understand that operational issues can arise, but a malfunctioning jet bridge and the resulting extended delay suggest an area where procedures or equipment maintenance may need attention. I hope you will review this incident to prevent similar disruptions in the future. I would appreciate acknowledgment of this concern and consideration of appropriate compensation for the inconvenience and lost time caused by this delay. Thank you for taking the time to review my experience. I look forward to hearing from you. Sincerely, Dion Dillard

The flight was on time and arrived early. The crew were friendly and helpful.

I got sick nothing contagious but distressing enough and the care I received on the flight was astounding.

Horrible. Both legs of my flight were delayed more than 6 hours. No compensation, no screens on the plane, and the plane was not clean.

After we'd boarded , they canceled the flight. The crew didn't even know , we just all received text messages. Then after they deplaned us , AA was just like "too bad, go F your self, we sure ain't gonna help you"

Initial flight was cancelled at the time of arrival to the airport, flight alternative requires switching from direct to flight with a layover, and the plane felt like it would split apart, it was so rattle-y.

The chair cushions may need an upgrade. I have been noticing they are so worn out, thin so you’d sit in a dip 😄. Other than that, all was an enjoyable trip. Thanks AA!

Weather delay for 2.5 hours followed by half hour crew delay, did not have ginger ale, uncomfortable seats

It was nobody’s fault - but the plane came 4-hrs late and we were updated randomly in 20-30 mins increments which left us hostage to sit and wait expectantly. It was very long and got very late. Our plane didn’t land until nearly 1 am! Also the toilet wasn’t working. The hosts were nice enough but were clearly “about to pass out” as one told me. Lastly, there was no snack or even time for it. Just a bad experience overall.

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.

Very well recently! Frontier is improving and less harrassing customer on luggages! Positive!

Good for a budget airline! It was easy to get on, staff was really nice. Can’t say anything about the food or entertainment because it wasn’t available, which is fine.

I am writing to express my disappointment with my recent Frontier Airlines flight. I was charged $99 at the gate because my bag was said to be too large, yet once onboard there was no available overhead bin space, and I was required to place the bag under the seat in front of me anyway. This made the charge feel unnecessary and unfair. Additionally, before the flight even took off, I was asked to move from the seat I paid for into a middle seat so another passenger and her cat could have my seat to themselves. I was not offered compensation or an explanation for being moved from a paid seat. Between the unexpected bag fee and being forced to give up my seat, this experience fell well below acceptable customer service standards. I would appreciate a review of this situation and appropriate compensation.

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.

Cancelled flight after I arrived at airport after 75 min drive and parking. Next flight was 4 days in the future. Had to scramble and buy a much more expensive flight on another carrier.

I liked the turn-style feature at gate 209B at LAX. Very efficient process. The gate staff also made several, clearly directed announcements so I felt very informed.

Everything you need to know for your flight from Ontario to District of Columbia

Information on your arrival and departure airports