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 9/1. 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

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Everything you should know

Cheapest round-trip
$239
Typical prices: $460-$565
Frontier
Tue 9/8Fri 9/11
BWI - ONT • 1 stop
Cheapest non-stop
$997
Typical prices: $456-$600
Southwest
Thu 7/30Sat 8/1
BWI - ONT • Non-stop
Nonstop flights
4 days a week
Mon, Thu, Fri, Sun
You can fly direct with Southwest. Average duration is 5h 15m
Direct flights
Direct flights
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Direct flights
Direct flights
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Top layover airports
Cheapest • Avg $344 (round-trip)
Shortest trip • 7h 23m (one-way)
Insights
Insights
Insights
Insights
When to book
in advance
Our data shows that travelers who book at least 2 weeks in advance save around 9% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
Cheapest • 23% price drop
Most popular
Good to know
Good to know
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Good to know
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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

Tue, Sep 8 - Fri, Sep 11
Frontier Logo
1:24 pm - 7:01 pm
BWI
-
ONT
8h 37m
1 stop
Frontier Logo
2:55 pm - 4:12 pm
ONT
-
BWI
22h 17m
2 stops
$239Frontier
Tue, Aug 25 - Thu, Sep 3
Frontier Logo
1:24 pm - 7:01 pm
BWI
-
ONT
8h 37m
1 stop
Frontier Logo
9:33 am - 8:37 pm
ONT
-
BWI
8h 04m
1 stop
$242Frontier
Mon, Aug 17 - Tue, Aug 25
Frontier Logo
4:44 pm - 7:01 pm
BWI
-
ONT
29h 17m
1 stop
Frontier Logo
10:59 am - 8:37 pm
ONT
-
BWI
30h 38m
1 stop
$243Frontier
Fri, Aug 14 - Fri, Aug 21
Frontier Logo
4:44 pm - 7:32 am
BWI
-
ONT
17h 48m
1 stop
Frontier Logo
9:33 am - 8:37 pm
ONT
-
BWI
8h 04m
1 stop
$247Frontier
Tue, Aug 18 - Tue, Sep 1
Frontier Logo
1:24 pm - 7:01 pm
BWI
-
ONT
8h 37m
1 stop
Frontier Logo
10:59 am - 8:37 pm
ONT
-
BWI
30h 38m
1 stop
$248Frontier
Wed, Aug 19 - Tue, Aug 25
Frontier Logo
1:24 pm - 7:01 pm
BWI
-
ONT
8h 37m
1 stop
Frontier Logo
10:59 am - 8:37 pm
ONT
-
BWI
30h 38m
1 stop
$250Frontier
Mon, Aug 17 - Sat, Aug 29
Frontier Logo
4:44 pm - 7:01 pm
BWI
-
ONT
29h 17m
1 stop
Frontier Logo
10:59 am - 8:37 pm
ONT
-
BWI
30h 38m
1 stop
$252Frontier
Mon, Aug 17 - Fri, Aug 21
Frontier Logo
4:44 pm - 7:01 pm
BWI
-
ONT
29h 17m
1 stop
Frontier Logo
9:33 am - 8:37 pm
ONT
-
BWI
8h 04m
1 stop
$253Frontier
Thu, Aug 27 - Sun, Aug 30
Frontier Logo
1:24 pm - 7:32 am
BWI
-
ONT
21h 08m
1 stop
Frontier Logo
9:33 am - 8:37 pm
ONT
-
BWI
8h 04m
1 stop
$254Frontier
Tue, Aug 18 - Tue, Aug 25
Frontier Logo
1:24 pm - 7:01 pm
BWI
-
ONT
8h 37m
1 stop
Frontier Logo
7:56 pm - 12:24 pm
ONT
-
BWI
37h 28m
2 stops
$255Frontier
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 September.

Flight prices are below average for this route right now.

Flights to Ontario from Baltimore usually cost between $390 and $574 in September.
The lowest price found in the past 5 days was $239 on Frontier (Sep 8-Sep 11).

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 Wednesday, 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 November, where tickets cost $352 (return) on average. On the other hand, the most expensive months are July and June, where the average cost of round-trip tickets is $553 and $546 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.

How far in advance should I book a flight from Baltimore to Ontario?

To calculate weekly average prices, KAYAK takes all prices for each week before departure 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 average of all the values for each week.

To get a below average price on the flight from Baltimore to Ontario, you should book around 2 weeks before departure, which saves you about 9% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 18 weeks before departure.

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 season

January

Cheapest flight

$121
Best time to beat the crowds with an average 17% drop in price.
Most popular time to fly with an average 3% 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 $242 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?

    You can catch a nonstop flight from Baltimore to Ontario on on Monday, Thursday, Friday, and Sunday.

  • 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 $472 and an overall rating of 8.0, 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 7.8.

  • 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 $336 or less one-way and $435 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

Thursday

Southwest

Southwest

Friday

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 5 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.
8.0
SouthwestOverall score based on 4231 reviews
7.5Entertainment
8.6Crew
8.0Comfort
7.0Food
8.1Boarding
Airline reviews

It was just okay, no frills, basic transportation with no luxury. No screens on the seats, no water or drinks on a short flight. Full flight but at least it was on time.

6.0 GoodSteven, Jun 2026
LAS - ONT
Read more Southwest reviews

It was just okay, no frills, basic transportation with no luxury. No screens on the seats, no water or drinks on a short flight. Full flight but at least it was on time.

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!

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.

It was canceled. Supposedly weather. But there was no snow in Baltimore. At least we found out before driving to airport

WIFI was great. My selection for seating is an aisle, but during my trip, I never had an aisle seat. If we can get that corrected, I will be thrilled. No snack or drink on this flight.

The seats were comfortable, and the boarding process was pretty smooth.

The crew canceled the complementary snack and drink in anticipation of turbulence that never materialized. I was counting on the drink (water) to take the the doses of medication - prescribed for my heart condition - that were due during the flight. Since no snack or meal was served on this flight, I cannot rate the food quality. Otherwise, this flight was excellent.

Flight was fine other than there was a gate change that I was not notified of. By chance I happened to check my phone and saw the change, otherwise, we would have missed our connecting flight.

Our flight to Oakland was great bc the plane was new but it was delayed by 15min not bad at all. Over all it was an 8/10

The flight in it self was good. The delays looking for pilots was unexpected.

We never made it on this flight because we missed our connection due to o delayed flight from Jackson.

We got stuck on the tarmac taxiing after landing early so we didn’t get off the plane until an hour later than we thought we would

It was okay. We were delayed for weather reasons, but the pilots and the flight control staff figured a way around the storm and were able to get us to Los Angeles safely. Not all the staff members were polite, but the entertainment on the flight was good.

Crew was real good, flight was smooth and came in early.

Love me some Delta. One of the few airlines to recognize and support veterans. Easy boarding, flight was on time and arrived early and the flight attendants were excellent on this flight.

We sat on the runway for over an hour before departure. That was unwelcome.

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

Delta was really good about being transparent with why we were delayed it’s just that’s the plane was really old and outdated and a lot of the comfort and amenities we know Delta to have did not shine through

My sister and I paid to have our seats and have them next to each other. I heard one of the employees say to the other one that you shouldn’t have given away reserved seats away to other passengers, and so I guess that is what happened because I got the last most uncomfortable seat in the plane even though I paid to sit in the middle of the plane with my sister. Terrible Experience !!

We checked one bag. That was fast and the agent was fast and super nice. At the gate, boarding was fast and efficient. Flight was uneventful which was great because it was early in the morning and most folks were sleeping. Landing was great. Delta does a really good job of making the flying experience better all around considering you are sitting in such a small space on a plane for several hours.

Great experience, boarding was fast and efficient, so much so that we arrived to Chicago very early

The seats were uncomfortable, as if the cushions haven't been switched out in many years. I felt like I was on an old bus. The food was delicious. thank you. Onboard entertainment, very limited. Unless you like violent movies. Why in the world would you have such severely violent movies on a plane? if you don't want to see such things, you don't have a choice. Have you considered that when choosing entertainment? Good god. Why would you have the Godfather? Or black women being brutally beaten with a club? Why in the hell would you put that kind of material on a plane? As for Kayak: Why when I ordered Qantas, was the plane on United?

Very comfortable flight, snacks and drinks were good, good communication from crew. Could have used a little more information on timing of boarding for group 5

I will never fly ANA again. They lost one of my large pieces of checked luggage, the heaviest one with the most valuable items in it, and they said they will not send me an email unless they can't find it, even though the paper they gave me to track the status of my lost luggage requires a code from an email they are supposed to send me so I can do baggage tracing. They claim to be an international airline, but they also insist on calling a Japanese telephone number to confirm where to send the lost baggage if they find it. It is impossible to find an actual contact email address for customer support on their website, and their AI chatbot is unhelpful, directing you to a webpage that says it is for contact information but does not have any actual email addresses or phone numbers listed on it. My seat in economy did not recline at all, even though I was not sitting in an exit row nor the very back row. I had to sit in the fully upright position for over ten hours of international travel. Awful experience overall.

Miserable. Active military on orders turned away from Lounge because not in uniform. This is completely contrary to United’s online lounge access policy. Sad that employees aren’t trained better. This is not the United Airlines my parents used to regularly fly with.

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.

Both flights were fine. I wish there was a little more legroom, but we got to where we needed to be on time, the crew did their job, and that’s really all that matters. We’ll fly United again.

Crew was unhelpful in boarding. Did not help passengers board and store bags efficiently. Did not alleviate tensions as passengers had to stow bags then return forward to seats. Baggage rules are unreasonable. Will fly southwest next time

On time from BWI to IAH but delayed over an hour from IAH to AUS without reason.

The overall service, quality, and price-point value for USA domestic flights is quite poor. If there were other options, I would take them.

Worst communication. Delayed boarding for two hours without a single announcement until hour 1 had passed - on time status showing until our flight was supposed to takeoff and the crew had already walked away. No one was boarding. Disgusting part of DFW overcrowded with no AC on a 97 degree day. Then the first app update is that we’d take off in 15 mins… but again no one had boarded a full flight. No announcement in the terminal so everyone is just crowded around a disgusting place with no info for over an hour which turned into two. This was an overfill flight and a disgrace to passenger decency all while likely just trying to fix their own issue of overbooking. The worst airline at the worst airport.

I’ve been on 8 flights with American Airlines in the last 2 months and 4 have been delayed.

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.

Smooth flight. From the early boarding and all were on board before departure time and arrived early in ONT. Great crew. Thank you!!!!

Amazing I love American. I’ll never fly anyone else if I can help it.

Kayak boarding information contained inaccuracies that would have not existed if booked directly with American. Paid for preferential boarding, was last to board.

great experience. minimal lines at BWI. at DFW they got a long haul 787 boarded in 30 minutes

Everything was great except for the wifi was junk. Crew was super friendly and helpful

Late arrival flight arrived in BWI and I missed connecting flight in CLT to mobile. I had to wait 6.5 hours for next flight.

It was fine. I didn't love the food but it was at least a real attempt at serving a meal, unlike my earlier flight from Nashville to Dallas.

Terrible. Delayed my family flight for several hours affecting family plans

Flight was delayed and then my second leg was completely canceled. Had to get a refund

Boarding was on time and plane departed as scheduled. There are obviously no amenities (food, drink, entertainment) on Frontier, but there also didn't seem to be any issues with luggage space either.

The single worst check in experience I could imagine. I’ll never do any business with Frontier or any affiliated company

The crew was mostly okay. The flight attendant who answered our questions was curt and unhelpful unfortunately. He seemed upset and I understand having off days.

Flight was cancelled and was not able to get another flight thru Frontier. Per frontier a refund was issued but I do not see a refund on my Afirm account.

The agent at check-in was strident, unwelcoming, and condescending to customers ahead of me.

Six hour delay. Poor customer service. No voucher. Bad communication. Missed important appointments.

Was charged 99 dollars for a bag despite agents previously telling me it would be ok. Customer service was unhelpful

I will like you ( Frontier Airlines) to fly into LAX instead of ONT because I live in LA and the subway takes me to my house in just 15 minutes

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

Information on your arrival and departure airports