BWI - ONT

$121 Find Cheap Flights from Baltimore to Ontario - Compare and Save

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Baltimore to Ontario departing on 7/2. 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 Ontario

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Baltimore to Ontario, 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 Baltimore to Ontario, as well as popular online travel agencies
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Everything you should know

Cheapest round-trip
$241
Typical prices: $542-$443
Frontier
Sat 7/4Sat 7/11
BWI - ONT • 1 stop
Cheapest non-stop
$479
Typical prices: $553-$539
Southwest
Tue 7/21Tue 7/21
BWI - ONT • Non-stop
Top airlines
Cheapest • from $241 (round-trip)
Best reviews • 7.9 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Nonstop flights
You can fly direct with Southwest. Average duration is 5h 15m
Direct flights
Direct flights
+1
+1
Direct flights
Direct flights
+1
Top layover airports
Cheapest • Avg $314 (round-trip)
Shortest trip • 7h 23m (one-way)
Insights
Insights
Insights
Insights
When to travel
Cheapest • 19% price drop
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
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KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Ontario!
Flight Deals
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Expert advice
Flight Deals

Cheap Flights from Baltimore to Ontario (BWI-ONT)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Baltimore 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 for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Baltimore to Ontario

Sat, Jul 4 - Sat, Jul 11
Frontier Logo
5:36 pm - 7:22 am
BWI
-
ONT
16h 46m
1 stop
Frontier Logo
9:32 am - 8:36 pm
ONT
-
BWI
8h 04m
1 stop
$241Frontier
Thu, Jul 2 - Sat, Jul 11
Frontier Logo
12:21 pm - 4:48 pm
BWI
-
ONT
7h 27m
1 stop
Frontier Logo
9:32 am - 8:36 pm
ONT
-
BWI
8h 04m
1 stop
$242Frontier
Sat, Jul 4 - Fri, Jul 10
Frontier Logo
5:36 pm - 7:22 am
BWI
-
ONT
16h 46m
1 stop
Frontier Logo
9:32 am - 8:36 pm
ONT
-
BWI
8h 04m
1 stop
$243Frontier
Fri, Jul 3 - Sat, Jul 11
Frontier Logo
5:32 pm - 5:52 pm
BWI
-
ONT
27h 20m
1 stop
Frontier Logo
9:32 am - 8:36 pm
ONT
-
BWI
8h 04m
1 stop
$244Frontier
Tue, Aug 11 - Tue, Aug 25
Frontier Logo
4:44 pm - 7:32 am
BWI
-
ONT
17h 48m
1 stop
Frontier Logo
5:43 pm - 8:37 pm
ONT
-
BWI
23h 54m
1 stop
$250Frontier
Fri, Aug 21 - Mon, Aug 31
Frontier Logo
5:19 pm - 5:52 pm
BWI
-
ONT
27h 33m
1 stop
Frontier Logo
5:43 pm - 8:37 pm
ONT
-
BWI
23h 54m
1 stop
$252Frontier
Sat, Aug 8 - Sat, Aug 15
Frontier Logo
4:44 pm - 7:32 am
BWI
-
ONT
17h 48m
1 stop
Frontier Logo
9:36 am - 8:39 pm
ONT
-
BWI
8h 03m
1 stop
$254Frontier
Mon, Jul 27 - Tue, Aug 4
Frontier Logo
4:44 pm - 7:32 am
BWI
-
ONT
17h 48m
1 stop
Frontier Logo
9:32 am - 8:36 pm
ONT
-
BWI
8h 04m
1 stop
$294Frontier
Thu, Jul 2 - Wed, Jul 15
Frontier Logo
12:21 pm - 4:48 pm
BWI
-
ONT
7h 27m
1 stop
Frontier Logo
9:32 am - 8:36 pm
ONT
-
BWI
8h 04m
1 stop
$296Frontier
Wed, Jul 22 - Wed, Jul 29
Frontier Logo
4:44 pm - 7:32 am
BWI
-
ONT
17h 48m
1 stop
Frontier Logo
9:32 am - 8:36 pm
ONT
-
BWI
8h 04m
1 stop
$298Frontier
Booking Insights

KAYAK's insights & trends for Baltimore to Ontario flights

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

How much is a round-trip flight from Baltimore to Ontario?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Baltimore to Ontario departing in July.

What’s the cheapest day of the week to fly from Baltimore to Ontario?

The average price of all round-trip flights from Baltimore to Ontario clicked on KAYAK for each day over the last 12 months.

For Baltimore to Ontario, Thursday is the cheapest day to fly on average and Sunday is the most expensive. Flying from Ontario back to Baltimore, the best deals are generally found on Tuesday, with Saturday being the most expensive.

What is the cheapest month to fly from Baltimore to Ontario?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Baltimore 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 Baltimore to Ontario is January, where tickets cost $369 (return) on average. On the other hand, the most expensive months are June and May, where the average cost of round-trip tickets is $546 and $521 respectively.

Can I save money by flying with a layover from Baltimore to Ontario?

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.

No, with an average price for the route of $379, prices are generally cheapest when you fly direct.

Expert advice

Expert advice for your flight from Baltimore to Ontario

 
AI-powered summary based on content written by travel experts. AI can make mistakes.
KAYAK teamed up with top travel experts to share the best tips for your journey.
Our travel experts
Jennifer Simonson

Jennifer Simonson

Expert on ONT

Jennifer Simonson is driven by her lifelong commitment to exploring the globe. Her insatiable curiosity had led her to immerse herself into diverse locations like Oklahoma City and Pismo. Her hotel recommendations are the result of the myriad hotels she's stayed at across her travels. Along her journey, she cherishes engaging conversations with locals, indulging in the finest ice cream, trying her hand at surfing, and embarking on nature-filled hikes.

Harriet Baskas

Harriet Baskas

Expert on BWI

Harriet is an award-winning journalist who is happiest in an airport or an unusual museum. Her stories about airports, air travel, and the business of travel have appeared on NBC News, CNBC, USA TODAY, The Points Guy and other outlets. She is the creator of the StuckatTheAirport.com blog and the author of nine books. When not out on the road or exploring the latest airport amenities, she’s home in Seattle getting ready for the next adventure.

Good to know

Low seasonJanuary
Cheapest flight$121
Best time to beat the crowds with an average 20% drop in price.
Most popular time to fly with an average 11% increase in price.
Flight from Baltimore to Ontario

When to book flights from Baltimore to Ontario

Are your dates flexible? Find out the best times to travel from Baltimore 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 Baltimore to Ontario

  • What is the cheapest flight from Baltimore to Ontario?

    In the last 5 days, the lowest price for a flight from Baltimore to Ontario was $121 for a one-way ticket and $241 for a round-trip.

  • Do I need a passport to fly between Baltimore and Ontario?

    No, a passport isn't needed to fly from Baltimore to Ontario. However, local authorities might ask for an official ID.

  • Which airports will I be using when flying from Baltimore to Ontario?

    Baltimore and Ontario are both served by 1 main airport. You will leave Baltimore from Baltimore/Washington and will be arriving at Ontario.

  • Which airlines offer Wi-Fi service onboard planes from Baltimore to Ontario?

    Alaska Airlines, and Hawaiian Airlines offer inflight Wi-Fi service on the Baltimore to Ontario flight route.

  • Which aircraft models fly most regularly from Baltimore to Ontario?

    The Boeing 737-800 Passenger/BBJ2 (winglets) is the aircraft model that flies most regularly on the Baltimore to Ontario flight route.

  • Which airline alliances offer flights from Baltimore to Ontario?

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

  • On which days can I fly direct from Baltimore to Ontario?

    There are nonstop flights from Baltimore to Ontario on a daily basis.

  • Which is the best airline for flights from Baltimore to Ontario, Southwest or Delta?

    The two airlines most popular with KAYAK users for flights from Baltimore to Ontario are Southwest and Delta. With an average price for the route of $466 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 $450 and an overall rating of 7.9.

  • How does KAYAK find such low prices on flights from Baltimore 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 Baltimore to Ontario.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Ontario from Baltimore 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 Baltimore 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 Baltimore with another airline. Booking your flights between Baltimore and ONT 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 Baltimore 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 Baltimore 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 Baltimore to Ontario

  • Looking for a cheap flight? 25% of our users found flights on this route for $232 or less one-way and $490 or less round-trip.

Prefer to fly direct from Baltimore to Ontario?

 
Direct data is based off flight results for the next 60 days. Find direct flights from all airlines flying direct from Baltimore/Washington to Ontario.
Find which airlines fly direct from Baltimore/Washington Airport to Ontario Airport, which days they fly and book direct flights.

Direct departures

Baltimore/Washington to Ontario

Monday

Southwest

Southwest

Tuesday

Southwest

Southwest

Wednesday

Southwest

Southwest

Thursday

Southwest

Southwest

Friday

Southwest

Southwest

Saturday

Southwest

Southwest

Sunday

Southwest

Southwest

See more direct flights

Direct returns

Ontario to Baltimore/Washington

Monday

Southwest

Southwest

Tuesday

Southwest

Southwest

Wednesday

Southwest

Southwest

Thursday

Southwest

Southwest

Friday

Southwest

Southwest

Saturday

Southwest

Southwest

Sunday

Southwest

Southwest

See more direct flights

Reviews of the top 4 airlines serving from Baltimore to Ontario

 
See real verified KAYAK customer reviews for airlines flying from Baltimore 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 Baltimore 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.
7.9
SouthwestOverall score based on 4237 reviews
8.0Comfort
7.5Entertainment
7.0Food
8.6Crew
8.1Boarding
Airline reviews

The first time I flew in the extra legroom section. It was difficult to notice a difference. I had bad luck with my neighbors. The crew was okay. Southwest has reduced the live TV options.

4.0 OkayAnonymous, May 2026
MDW - LAX
Read more Southwest reviews

The first time I flew in the extra legroom section. It was difficult to notice a difference. I had bad luck with my neighbors. The crew was okay. Southwest has reduced the live TV options.

No gluten free snacks. Seats felt worn or bare bones even though it was a new 737 MAX 8.

Plane was clean and comfortable. Flight attendants and gate staff were professional, friendly and efficient. Boarding and deplaning were orderly and efficient. All in all, the typical excellent Southwest experience.

Not having a five hour delay with little notice! The crew was very kind, though, and just as tired as we passengers were. The flight didn't depart until nearly 1 am...and no reason was ever given.

This leg was much better, but we did have to have a 3 hour lay o er after coming from a very exhausting hiccup with our flight from BNA to Den

The entire travel day was a disaster from beginning to end. Woke up at two in the morning to make it to San Juan airport in time for a 5:30 am flight to Milwaukee which connected in Baltimore. Massive delays lead to me missing original connection out of Baltimore. Sixteen hours of delays/rebooking/layover time later, arrived in Milwaukee to find that only one of two checked bags made it there (despite the fact that Southwest brought another 737 jet to San Juan to fly us out to our original Baltimore connection—-not squeezed into another booked flight). The flight from Baltimore to Milwaukee was barely half full, so there was no logical reason to ship my bags out of Baltimore on a different flight to Chicago to then ship to Milwaukee. Southwest decided that my bags should not have been on the same connecting flight I WAS ON to Milwaukee, and then proceeded to accidentally leave my larger bag with the important items in Chicago. Terrible logic and support all around. Extremely angered and disappointed with SW. What a clownish operation your company has become!

The Air hostess were very rude on my flight from Houston to Austin . Their regular communication itself felt a they are shouting at people.

Love them will get a Southwest card to track my points and keep flying with them. My family and I were pleased with the services.

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.

Everything went smoothly, although the usual gripes about airline travel were still present: the boarding process is inefficient, the snack selection is limited, and so on. Since there was extra space on the flight, the gate agent rearranged many people's seats to put people on the aisles and windows, leaving the middle seats empty, as much as possible, which was pretty great.

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!

One of the flight attendants was a little cranky. I appreciated the free wifi and plug to charge my laptop

WiFi didn’t work most of the time. The usb chargers would work only occasionally for 5 mins and wouldn’t charge after that. Had to keep trying repeatedly at each of the seats in the row.

The crew bent over backwards to thank us for flying and make us comfortable. The food service was quick and efficient. The Captain communicated and said goodbye and thank you as we departed. They really stood out!

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

my mom urmila patel needed a wheelchair which was not available on the curbside. she needed to walk almost 50 meters inside (at the risk of falling) and then had to wait in line to get a wheelchair (this is not ok). Once obtained she had to seat in it for 30-45 minutes for someone to take her in thru the checkin process (which was fairly smooth and easy). the lady who helped her with her checkin process was very courteous and helpful

Staff at the check-in counter were friendly, happy and helpful. They tagged our bags and sent us to “bag drop off” but were not very clear about where that was. The airport was busy we headed off in what we thought was the right direction until a gentleman waved us down and actually came after us. He was the baggage handler for Delta and recognized our “deer in the headlights “ look-he brought us to the right area (which was marked as the Southwest Airlines Drop Off) and sent us on our way. Wonderful guy, low key and working with a big smile on his face. Loved it. Loved him.

Arlene was a great flight attendant. I also liked how one of the other flight attendants gave us a heads up about snacks and asked everyone to remove their headphones when it was their turn to order. Good idea.

I haven’t flown economy in over 20 years but it was not bad. Room by my feet for my bag and seat was roomy enough. Surprised in a good way.

Packed flight, which makes it tough on crew and boarding staff (and the customers of course). But this was great boarding, clear instructions, etc. Traveling on the weekends are always fraught with danger as you have families and less frequent flyers thus more confusion. But this flight went as planned.

Destroyed my suitcase. Tired of talking about it. Cancelling my unite mileage plus account.

New plane was lovely. Crew customer service is always lax but expected. Kraft on time and arrived safely.

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

6 1/2 hours from Tampa to SFO on a Boeing 737. Cramped. No Service. No real food. One pass for coffee at the beginning and a second pass THREE hours later. And check-in in Tampa was nasty even by United standards. And I am at almost TWO million miles on United. It's a non-stop. But terrible service.

First class ticket gets you no seat back entertainment? I have to bring my own laptop to see a movie? And most of their movies have ADS? No thank you. Worse: Tiny snacks only on a 2 hr flight?

Late plane. Only one crew on the ground so we b had to wait for Denver flight to come in, board, and depart. At 78 yrs of age I was not pleased trying to get my connection. What really made me angry was the notification you sent me to hurry up or I would miss my connection. Why tell me to hurry up when you got me in late. It was not a good way of treating customers.

No complaints other than luggage carousel was incorrectly guiding passengers to the wrong carousel on the screen.

Outstanding service, efficient & friendly crew, flight was safe, comfortable & on time

The crew was great. Very friendly and responsive. The plane was old, small and tight. We ran out of overhead space and I had to check. Middle seat was particularly tight.

Was put into a seat right behind the toilet that had no entertainment possible but did have plenty of leg room over noisy part of plane.

I would like a refund for the extra cost the seat I paid for. An oversized person sat next to me and I couldn’t fit on my seat and had to move to another seat.

American delayed the flight for a crew rest period. The delay occurred late in the evening - the earliest i can find is 10:20 pm. With a 6 am flight anyone on the flight would have already have been asleep (unless you are insane, a vampire or on drugs) and at least for me i was already on the way to the airport at 445 am the next morning when i discovered they delayed the flight until 9 am. Given the incoming flight was in the air at 6 pm the evening before this should have been figured out a lot more timely that was there only crew to use. Just frustrating given there is no consideration for customer experience anymore in flying.

Flight: Started on time. Comfortable flight. Arrived on time. Crew: Very cordial and helpful. Drinks and snack was served with a smile. Overall enjoyed the trip. Regards, Hari Doss Chanchala Doss

To have arrived on time and not 3 hours late after having already spent $100 to change to an earlier flight, only to arrive back home close to the original flight time.

American Airlines is a miserable experience. It is predictably miserable, in the sense that every time I fly American, I brace myself for the certainty that it will be unpleasant and uncomfortable. But it is unpredictable in the sense that I never know if the flight will be on time or delayed nine hours (both happened to me this week). I never know if I will be able to sit in the seat that I selected when I purchased the ticket or if I will be told by Customer Service (!!!) that I must relocate from first class to a seat in the back of the aircraft with no explanation (both happened to me this week). Will the food be frozen and half defrosted, or scalding hot? Will the drinks be warm? Will the flight attendants be surly and mean? Will the toilets be cramped and foul? Will the seats be narrow and uncomfortable? Will there be a real electric outlet at the seat, or just an unreliable USB-2 port? Will there be enough seats in the boarding lounge or just a few? Will the boarding process be smooth and efficient, or will the gate agents mess it up and delay it needlessly for 30 or 40 minutes? Will the catering and cleaning crew be prompt or will they take an extra 30 minutes? Will the brakes on the aircraft work properly, or will the pilot delay takeoff for four hours while the ground crew attends to what can only be described as routine maintenance that should have been done the night before? I've eexperienced every one of these unpleasant things this year, 2026. The only thing I can reliably count on is that American will find a new way to make the experience of flying as miserable as they possibly can.

Wifi was spotty. Tray table was very dirty when I sat down.

The WiFi would not connect enough for me to do my actual work. It permaspooled, disconnected, said it was connected, then wouldn't open an email... it was frustrating. I am not a tall person, 5'4" - and I felt cramped with little room to reach into my bag under the seat in front of me. I feel sorry for anyone taller than me having to fly. the one positive thing I will add, is the overhead bins are roomy enough to manage more bags than other carriers.

Going non stop to lax like I paid for. Not stopping in MCI for gas. Too long of delays

Delayed for mechanical and no updates on what was happening and how long the delay might be.

Everything you need to know for your flight from Baltimore to Ontario

Information on your arrival and departure airports