ONT - BWI

$71 Find Cheap Flights from Ontario to Baltimore

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 Baltimore departing on 2/5. 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 Baltimore

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Ontario to Baltimore.
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Ontario to Baltimore.
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Flight Deals

Cheap Flights from Ontario to Baltimore (ONT-BWI)

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

Fri, Dec 12 - Sun, Dec 14
Multiple Airlines Logo
2:05 pm - 9:17 amONT-BWI
16h 12m1 stop
Multiple Airlines Logo
11:14 am - 4:33 pmBWI-ONT
32h 19m1 stop
$167Multiple Airlines
Find Deal
Fri, Dec 5 - Mon, Dec 8
Multiple Airlines Logo
2:05 pm - 9:17 amONT-BWI
16h 12m1 stop
Multiple Airlines Logo
8:39 pm - 11:27 amBWI-ONT
17h 48m1 stop
$175Multiple Airlines
Find Deal
Wed, Jan 7 - Sun, Jan 11
Frontier Logo
8:00 am - 5:47 pmONT-BWI
30h 47m2 stops
Frontier Logo
10:00 pm - 6:03 pmBWI-ONT
23h 03m1 stop
$208Frontier
Find Deal
Fri, Nov 14 - Sun, Nov 16
Frontier Logo
8:24 am - 6:40 pmONT-BWI
7h 16m1 stop
Frontier Logo
9:59 pm - 6:57 amBWI-ONT
11h 58m1 stop
$264Frontier
Find Deal
Thu, Dec 4 - Wed, Dec 10
American Airlines Logo
10:34 pm - 10:14 amONT-BWI
8h 40m1 stop
American Airlines Logo
2:46 pm - 7:39 pmBWI-ONT
7h 53m1 stop
$279American Airlines
Find Deal
Sat, Feb 14 - Tue, Feb 17
American Airlines Logo
7:10 am - 10:59 pmONT-BWI
12h 49m1 stop
American Airlines Logo
1:00 pm - 7:57 pmBWI-ONT
9h 57m1 stop
$290American Airlines
Find Deal
Sat, Feb 14 - Tue, Feb 17
Delta Logo
6:00 am - 7:19 pmONT-BWI
10h 19m2 stops
Delta Logo
7:15 am - 11:59 amBWI-ONT
7h 44m1 stop
$316Delta
Find Deal
Thu, Dec 4 - Fri, Dec 5
Delta Logo
12:12 pm - 10:08 pmONT-BWI
6h 56m1 stop
Delta Logo
6:21 pm - 11:04 pmBWI-ONT
7h 43m1 stop
$317Delta
Find Deal
Tue, Dec 2 - Wed, Dec 10
United Airlines Logo
6:41 pm - 7:19 amONT-BWI
9h 38m1 stop
United Airlines Logo
3:56 pm - 9:49 pmBWI-ONT
8h 53m1 stop
$331United Airlines
Find Deal
Tue, Dec 2 - Tue, Dec 9
United Airlines Logo
5:05 am - 5:25 pmONT-BWI
9h 20m2 stops
United Airlines Logo
1:10 pm - 10:49 pmBWI-ONT
12h 39m2 stops
$335United Airlines
Find Deal

Everything you should know

Our travelers' advice
AI-generated summary based on content written by travel experts
ONT's streamlined security ensures quick departures.
BWI provides easy access to Baltimore via light rail.
Expert advice
Expert advice
Expert advice
Expert advice
Top airlines
Frontier
Cheapest • from $208 (round-trip)
Southwest
Best reviews • 8.0 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
When to book
4 weeks
in advance
Our data shows that travelers who book at least 4 weeks in advance save around 41% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
May
Cheapest • 21% price drop
May
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Nonstop flights
6 days a week
There are direct flights from Ontario to Baltimore 6 days a week: Mon, Tue, Thu, Fri, Sat, Sun.
Direct flights
Direct flights
Direct flights
Direct flights
Cheapest round-trip
$167
Overall average: $456
Multiple Airlines
Fri 12/12Sun 12/14
ONT - BWI • 1 stop
Cheapest non-stop
$533
Southwest
Fri 12/12Sun 12/14
ONT - BWI • Non-stop
Start a new search
KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Baltimore!
Booking Insights

KAYAK's insights & trends for Ontario to Baltimore flights

Get data-powered insights and trends into flights from Ontario to Baltimore 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 Ontario to Baltimore?

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

Your flight ticket price will generally be cheaper if you fly to Baltimore on a Thursday and more expensive on a Wednesday. On your return trip to Ontario, you should consider flying back on a Saturday, and avoid Sundays for better deals.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Ontario to Baltimore, 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 Baltimore is May, where tickets cost $361 (return) on average. On the other hand, the most expensive months are November and June, where the average cost of round-trip tickets is $528 and $524 respectively.

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

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 $512, prices are generally cheapest when you fly direct.

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

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 Baltimore, 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 Baltimore, you should book around 4 weeks before departure, which saves you about 41% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 12 weeks before departure.

Expert advice

Expert advice for your flight from Ontario to Baltimore

 
Snippets provided in this section are AI-generated based on a summarization of KAYAK-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
KAYAK teamed up with top travel experts to share the best tips for your journey.
Airports
ONT

ONT offers streamlined security with average wait times of 6-15 minutes, making it ideal for a stress-free departure.

Read more about ONTby Jennifer Simonson
BWI

BWI offers easy access to downtown Baltimore via light rail, located just outside the terminal.

Read more about BWIby Harriet Baskas
Our travel experts
Jennifer Simonson

Jennifer Simonson

Expert on ONT

Jennifer Simonson

Jennifer Simonson

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.

Read more
Harriet Baskas

Harriet Baskas

Expert on BWI

Harriet Baskas

Harriet Baskas

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.

Read more

Good to know

Low seasonJanuary
Cheapest flight$71
Best time to beat the crowds with an average 6% drop in price.
Most popular time to fly and prices are also 22% lower on average.
Flight from Ontario to Baltimore

When to book flights from Ontario to Baltimore

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

  • What is the cheapest flight from Ontario to Baltimore?

    In the last 3 days, the lowest price for a flight from Ontario to Baltimore was $71 for a one-way ticket and $167 for a round-trip.

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

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

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

    Ontario airport is called Ontario and the only airport in Baltimore is Baltimore/Washington.

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

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

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

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

  • Which airline alliances offer flights from Ontario to Baltimore?

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

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

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

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

    The two airlines most popular with KAYAK users for flights from Ontario to Baltimore are Southwest and Delta. With an average price for the route of $479 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 $434 and an overall rating of 7.9.

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

    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 Baltimore.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Baltimore 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 Baltimore?

    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 Baltimore with an airline and back to Ontario with another airline. Booking your flights between Ontario and BWI 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 Ontario to Baltimore?

    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 Baltimore 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 Baltimore

  • Looking for a cheap flight? 25% of our users found flights on this route for $197 or less one-way and $456 or less round-trip.

Prefer to fly direct from Ontario to Baltimore?

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

Direct departures

Ontario to Baltimore/Washington

Monday

Southwest

Southwest

Tuesday

Southwest

Southwest

Thursday

Southwest

Southwest

Friday

Southwest

Southwest

Saturday

Southwest

Southwest

Sunday

Southwest

Southwest

See more direct flights

Direct returns

Baltimore/Washington to Ontario

Monday

Southwest

Southwest

Tuesday

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 Ontario to Baltimore

 
See real verified KAYAK customer reviews for airlines flying from Ontario to Baltimore. 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 Baltimore? 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 4239 reviews
7.0Food
8.6Crew
8.0Comfort
8.1Boarding
7.5Entertainment
Airline reviews

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.

8.0 ExcellentGreg, Oct 2025OAK - BUR
Read more Southwest reviews

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.

All was good. I just had a hard time getting connected to the WiFi/internet during the flight

Sacrament staff are always polite and helpful. Airport is easy to maneuver and boarding is straightforward.

Great flight. Outstanding Service. Southwest was able to put us on a direct flight to Denver when the connection could have been affected by a later arrival to Baltimore. The direct flight was less expensive that the flight with the connection in Baltimore.

As always, the entire Southwest experience was wonderful, from online booking to flight to baggage retrieval. Very grateful.

The weather could have been better. There was a 40 minute ATC delay in SFO because of marine fog and a micro cell storm delayed landing and take-off at Nashville. The gate was changed 5 minutes from boarding from gate B3 to gate C23 at Nashville airport.

After being assaulted by a flight attendant I was then brushed off as oh well because he long braids didn’t mean to whip me in the eye. I have filed complaints and will see. But like any other issue I’ve had with kayak involved it’s been trash. Last time I’ll be using your app

AC sub par. WiFi not working correctly. Ac sucked. Seats very narrow.

The cabin was quiet for the redeye flight. The area was clean. The staff was great. The 787 Max was in good condition. Drawbacks were that the seat widths were tight for some passengers. The seat padding was at best average and for a long flight uncomfortable.

If we are going to have to pay for luggage, make it easier to do. Put something on the app during check-in so I don't need to do it at the kiosk. I've done it twice recently and I ended up having to pay at the desk because something went wrong at the kiosk in Tampa.

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.

The flight used a B767 with a very old interior from before 2014. The entertainment system did not work at all during the flight despite attempts to reset the system. It was like they flew this route just to be competitive.

Delayed flight (1hour) plus a long layover after an overnight flight with no backup plane available.

Flight delayed for two and half hours and then canceled altogether due to mechanical issues. No mechanic onsite to fix so had to send one from LAX.

My husband upgraded our seats and I don't know if it was due to the type of planet was or if they didn't upgrade our seats. We were supposed to be in I believe comfort seats and they were just as tight as any other seat- no leg room and we are very tall people but at least it wasn't extremely cold. My husband did put in a complaint about our seating because he paid extra and if we would have known that the space and the tightness would have been the same, we just would have gotten the emergency row emergency row seats that we normally get. We love Delta but both our flights coming home we're not good. Oh I forgot to mention that on our flight to Hawaii our luggage wheels got broke and we had to purse new luggage on vacation then we never had this problem so we didn't know protocol and reported it after we got home only for them to tell is we only had 24hrs to report the damage. Not sure what was going on with Delta this vacation trip.

Crew was excellent. Comfort seats not as nice as other kinds of planes.

It was a great flight and the stewards and stewardess were all kind and accommodating!! The seats were comfortable and entertainment screen excellent!

There are 4 flights in consecutive gates with about the same departure time. Two flights were boarding at the same time. One was delayed or boarding would be happening at the same time. I am not sure what Delta and LAX need to do to have a better layout at the end of Terminal 2

There was a security issue at the airport and we were unable to land. We circled endlessly and then landed at another airfield for fuel. We then circled the airport again, almost landed but didn’t fully touch down before circling again. I am thankful to the crew for keeping us safe- the issue was the airline and staff at the airport getting us seats on our connecting flights. That part was hours of searching for someone and getting in double my steps.

Most aspects were good however if they assign boarding zones they ought to enforce them or why bother? My luggage from SAN-JFK-MAD was lost in NY so I without my main bag for two days upon arrival in Spain. They were helpful in tracking it and eventually delivered it to my hotel. The flub was because of a delay upon arrival in NYC. I had booked 2 1/2 hours between flights but we had to hold on the taxiway for an hour after landing while waiting for a clear gate which likely caused the baggage error.

The flight attendants were great, I joked with one I can’t remember her name, a blond, really sweet. I thought it was run well very professional. This was great i survived Spirit, I know for which I speak.

I was in first class. The outlets at my seat did not work. The plane was shabby and run down. I had prepurchsed a day subscription for internet that was not redeemable. I had to repurchase the internet for my flight and then it didn’t work anyway. Quite disappointed in what was supposed to be the launch of a great vacation.

I understand stuff happens, but plane failures are likely due to lack of maintenance. Additionally, air conditioning wasn't working, no snack/drink service, no WiFi. Fortunately, the crew was communicative and light-hearted. United grabbed another plane and we were able to get to our destination.

Stuck on tarmac for two hours plus a 5.5 hour flight. Rude flight attendant. And no meals, not even for purchase!

I learned that seating towards the end of plane that a line forms for the restroom and people use your chair as a hand railing, bumping your seat consistently. I was seated in the aisle. I think that next time if I am towards the back row I would want to sit in the middle or window seat.

United sent me a mileage plus number last year but that number is invalid so I can’t use it to check into flights or collect mileage. There is human to speak about the problem, only computers who keep asking me if I am using the correct email. It’s so frustrating and I cannot resolve it.

Not a great experience. We paid for the upgrade for premium economy seats and seated ourselves in very comfortable seats. Someone came along with the same seat on their boarding pass. The aircraft had been changed and as a result we were booted out and sent further back to small uncomfortable seats. After complaining we were moved to emergency row seats, which gave us more leg room but the seats don’t recline. For people in our 70’s we found having to sit upright from California to NJ very uncomfortable. Not sure why they chose to move senior citizens instead of the two people that were allowed to take the more comfortable seats. Not happy.

Everything was great. Only thing that could’ve made it better was buy on board options for hot food, but the snacks were decent. The flight attendants were great. I had no complaints. I was able to make it to my destination safely

Boarded plane and then delayed 1.5 hours while on the plane

Horrific. They missed my connecting flight to San Diego. I didn’t get there until Monday at 9am when I had a mandatory court settlement conference scheduled at 6am since we had parties on the east coast. This caused many issues. All because United apparently forgot to hold the doors open until my flight landed that only had a 10 minute delay. This was the last flight to Southern California. So I couldn’t even rent a car to finish the trip. United cannot be trusted when traveling on specific days and times since weather didn’t have anything to do with the delays.

The flight was smooth, the pilot kept us informed about delays and we arrived more of less on time

The flight was flawless and we even arrived between 20 and 25 minutes early!

Always seated jammed in rear of aircraft Admirals Club food at DFW terminal D was absolute worst food experience and I pay $600/year to eat this dried out junk

Mostly good. Flight was crowded but Airline personnel were very friendly & accommodating. It would be good to have savory snacks rather than just sweet Biscoff cookies.

It was a red eye flight, so no meals were provided, but it was fine with snacks. The seats felt cramped and almost too narrow.

Very crowded flight but what can you expect these days?? Crew was accommodating.

The seats in economy were appeared to be quite thin and lack sufficient cushioning to be comfortable. Perhaps it was my seating position but the plane seemed notably load.

The entertainment package was vast and the selections were very current. Keep updating it was great.

The seat was so hard my tailbone was aching The crew was kind of a b**** because I made a joke that I didn't care if they close the door I total c*** when she was trying to f****** act like she was mad at me because I said that The flight was bumpy. Sure you didnt have control over that.

4 hours late, including over +1 hour waiting in plane to take off. Baggage left behind too.

Inbound plane was on time and flight departed on time with no issues while boarding.

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.

After boarding and un-boarding twice over 6+hours, the flight was canceled.

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.

The Boarding process in Denver was chaotic, and since the line was so long, we were lined up very far from the gate. If there were any announcements from the gate staff, we didn't hear them. The flight attendants were spectacular. The only negative part of the flight was sitting by a 2 1/2 year old who was unruly and unfortunately had parents that matched his behaviors. Also, the restaurants in Denver on the E concourse, they didn't have food (passengers could only order 1 item on the entire menu) or the restaurants had 12-14 people waiting for orders to be prepared and another 6 people waiting to order. If you have a layover in Denver and need to grab food, be prepared to visit the shops with pre-packaged sandwiches, or you can visit another concourse but it may take a while to transit throughout the airport.

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.

The seats were awful, hard plastic covered in sheet vinyl. The airline tries to scam you into paying extra to get seat together when the flight wasn’t full. They were going to separate a family with young children but my wife who had a row to herself gave up her seat so the young mom could be with her young boys. I’m never giving this airline my money again.

It was a short flight so no food or entertainment….

Frontier had yet another flight cancellation. Have never made a complete round trip with this airline without at least one leg getting cancelled. Miserable flights - dirty, uncomfortable planes that apparently always have issues since I've had multiple delays and cancellations with them.

Flight was delayed 3 times, would have been nice to have received text message instead of email notifications. Frontier app wasn’t even updated accordingly, no gate number disclosed. No agent at front desk of gate to inform of delay. Very confused and left if the dark

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

Information on your arrival and departure airports

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