ONT - BWI

$118 Find Cheap Flights from Ontario to Baltimore - 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 Ontario to Baltimore departing on 7/14. 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, 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 Baltimore, as well as popular online travel agencies
Travelers love KAYAK
41,299,237 searches in the past 7 days on KAYAK

Save 21% 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.

Everything you should know

Cheapest round-trip
$239
Typical prices: $371-$583
Frontier
Thu 8/13Wed 8/19
ONT - BWI • 1 stop
Cheapest non-stop
$482
Southwest
Mon 7/20Wed 7/29
ONT - BWI • Non-stop
Top airlines
Cheapest • from $239 (round-trip)
Best reviews • 7.9 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Nonstop flights
Every day
You can fly direct with Southwest. Average duration is 4h 50m
Direct flights
Direct flights
+1
+1
Direct flights
Direct flights
+1
Top layover airports
Cheapest • Avg $267 (round-trip)
Shortest trip • 6h 30m (one-way)
Insights
Insights
Insights
Insights
When to book
in advance
Our data shows that travelers who book at least 4 weeks in advance save around 7% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
Cheapest • 21% price drop
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
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!
Flight Deals
Booking Insights
Expert advice
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

Thu, Aug 13 - Wed, Aug 19
Frontier Logo
9:36 am - 8:34 pm
ONT
-
BWI
7h 58m
1 stop
Frontier Logo
1:24 pm - 7:01 pm
BWI
-
ONT
8h 37m
1 stop
$239Frontier
Wed, Aug 12 - Tue, Aug 18
Frontier Logo
9:36 am - 8:34 pm
ONT
-
BWI
7h 58m
1 stop
Frontier Logo
1:24 pm - 7:01 pm
BWI
-
ONT
8h 37m
1 stop
$240Frontier
Sat, Aug 15 - Sat, Aug 22
Frontier Logo
9:36 am - 8:39 pm
ONT
-
BWI
8h 03m
1 stop
Frontier Logo
1:24 pm - 7:01 pm
BWI
-
ONT
8h 37m
1 stop
$241Frontier
Mon, Jul 20 - Wed, Jul 22
Frontier Logo
9:32 am - 8:36 pm
ONT
-
BWI
8h 04m
1 stop
Frontier Logo
4:44 pm - 7:32 am
BWI
-
ONT
17h 48m
1 stop
$242Frontier
Mon, Jul 20 - Wed, Jul 29
Frontier Logo
9:32 am - 8:36 pm
ONT
-
BWI
8h 04m
1 stop
Frontier Logo
4:44 pm - 7:32 am
BWI
-
ONT
17h 48m
1 stop
$243Frontier
Mon, Aug 17 - Tue, Aug 25
Frontier Logo
9:36 am - 8:34 pm
ONT
-
BWI
7h 58m
1 stop
Frontier Logo
1:24 pm - 7:01 pm
BWI
-
ONT
8h 37m
1 stop
$244Frontier
Fri, Aug 7 - Wed, Aug 19
Frontier Logo
9:36 am - 8:39 pm
ONT
-
BWI
8h 03m
1 stop
Frontier Logo
1:24 pm - 7:01 pm
BWI
-
ONT
8h 37m
1 stop
$246Frontier
Thu, Jul 30 - Sun, Aug 2
Frontier Logo
9:32 am - 8:36 pm
ONT
-
BWI
8h 04m
1 stop
Frontier Logo
4:44 pm - 7:32 am
BWI
-
ONT
17h 48m
1 stop
$247Frontier
Wed, Aug 5 - Mon, Aug 10
Frontier Logo
9:36 am - 8:34 pm
ONT
-
BWI
7h 58m
1 stop
Frontier Logo
4:44 pm - 7:32 am
BWI
-
ONT
17h 48m
1 stop
$248Frontier
Sat, Jul 25 - Mon, Jul 27
Frontier Logo
9:32 am - 8:36 pm
ONT
-
BWI
8h 04m
1 stop
Frontier Logo
4:44 pm - 7:32 am
BWI
-
ONT
17h 48m
1 stop
$249Frontier
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.

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

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

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 Wednesday and more expensive on a Saturday. On your return trip to Ontario, you should consider flying back on a Thursday, 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 September, where tickets cost $357 (return) on average. On the other hand, the most expensive months are June and July, where the average cost of round-trip tickets is $550 and $530 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.

Yes, flying with a layover may cost you more time, but you can also save money on the route, with a 1 stop layover the cheapest option at $522 on average.

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 7% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 22 weeks before departure.

Expert advice

Expert advice for your flight from Ontario to Baltimore

 
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$118
Best time to beat the crowds with an average 17% drop in price.
Most popular time to fly with an average 20% increase in price.
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 5 days, the lowest price for a flight from Ontario to Baltimore was $118 for a one-way ticket and $239 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, JetBlue, Delta, and Hawaiian 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 MAX 8 is the aircraft model that flies most regularly on the Ontario to Baltimore flight route.

  • Which airline alliances offer flights from Ontario to Baltimore?

    SkyTeam, oneworld, and Star Alliance are the airline alliances operating flights between Ontario and Baltimore, with SkyTeam 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 $486 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 $441 and an overall rating of 7.8.

  • 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 $188 or less one-way and $497 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

Wednesday

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

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 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.
7.9
SouthwestOverall score based on 4246 reviews
8.1Boarding
8.6Crew
7.0Food
8.0Comfort
7.5Entertainment
Airline reviews

Flight coming out of Buffalo was delayed, so we had to be rescheduled on another flight from Baltimore to Phoenix which means we had a long layover and got home 3.5 hours late. Shuttle to parking stopped at 10pm, so we had to pay for an Uber to the parking lot and got charged an extra day of parking since it was after midnight. Not the best experience. Long day!

2.0 MediocreDawn, Jun 2026
BUF - BWI
Read more Southwest reviews

Flight coming out of Buffalo was delayed, so we had to be rescheduled on another flight from Baltimore to Phoenix which means we had a long layover and got home 3.5 hours late. Shuttle to parking stopped at 10pm, so we had to pay for an Uber to the parking lot and got charged an extra day of parking since it was after midnight. Not the best experience. Long day!

Southwest continues to do less for more money. Flight attendants used to be fun and friendly. But now it’s like they don’t even see you. Such a shame.

I liked it better when you were truer to your roots Am paying more for less fun

We had a 5 hour delay on the tarmac in Baltimore

Long layover between flights to Long Island from BWI - need better coordination between flights

The last 3 flights between BWI and BDL canceled the beverage service mid- way. Just say up front that the fight is too short. Thanks!

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

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.

The flight took off late, which really stressed me out for 5 hours worrying about my connection. We started boarding late... not sure why. There was a long line for preboard of folks that needed assistance or were in wheelchairs and not enough attendants to help. There was one lady who seemed to hold up regular boarding bc she needed to consolidate her 3 bags into 2. I'm wondering why we all had to wait for her and not board around her. Crew on board was great! So funny, so helpful and very nice. They reassured me my connecting flight would wait... and it dead. Seems it was waiting on several connecting flights, so it took off late too. Overall a very long trip but I'm glad I didn't have to spend the night in the Baltimore airport. And why are SW terminals so far from each other. I had to haul from the end of one terminal to the end of different terminal to catch my flight.

2 hours late leaving… had to fly to Florida to then fly back to ny… bad

It was as good as it could be. Flying is not a pleasant experience these days.

Very good flight. Crew was great. No issues and we even arrived early.

DTW line is too long. The flights from DTW to BWI are always delayed for unknown reasons.

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

737-800 in first class was pretty dumpy. Seat had an uncomfortable angle, storage under the seat was blocked so even my very modest backpack didn't fit, power outlet was flaky. Weird tiny seat pockets that couldn't hold a gallon ziploc bag, emesis bag missing, etc. etc. No in-flight service due to turbulence. Crew was excellent, boarding was smooth despite a full flight.

Service was good for such a short flight. Small plane but smooth flight.

The flight was overbooked and the staff at the gate started calling for volunteers to drop out and offering incentives. That delayed the flight

Could not hear any of the announcements. The speakers seemed out of service. I wish the entertainment system would allow me to watch on my own iPad than the airplane ‘s old display.

There was no wifi even after my husband paid for wifi it wasn’t working. The plane looked and felt old.

Update the cabin with tv screens or at least music sources.

Great staff. Clean plane, but we were delayed for more than an hour due to maintenance issues and had to board another plane.

Lost one piece of luggage even though I checked in 2.5 hours before the flight

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

Not being stranded in Chicago for her airport to 11:30 tomorrow morning the 3rd

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

David went above and beyond to make our flight the best that it could be

The crew and flight was amazing. I haven't flown United in years but plan to switch to you being my main airline

Wouldn’t let me check in said couldn’t find a ticket had to wait very long Time

Seat cushions were worn down and it hurts as I seated under 5 hours of the plane ride.

I wish I had another choice. Domestic flight in the USA is atrocious.

Flight was delayed multiple times without giving any particular reason and the only thing that was communicated was that 'Aircraft is getting ready'. I was stuck at SFO airport for 15 hours and finally took Southwest Airlines flight back home to Dallas.

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

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

The flight changed gates multiple times and flight had to be delayed multiple times

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

I like that the crew kept us informed but we moved back and forth from gate to gate before the aircraft arrived.

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!

VERY disappointed at the agent checking in my luggage. I know that the weight limit is 23 kg, a little over 50 pounds (50.71 pounds). Yet the agent kept repeating "50 pounds". So I said, the limit is 23 kg, and she had the audacity to say 'no, it is 22 kg!" Imagine my surprise. Was she ignorant or was she poorly trained? Not sure. The boarding process was pretty good. The speakers were loud enough so I still could hear them despite inconsiderate passengers continuing to speak while the announcements were going on. During the flight, the teenage girl sitting behind me kept pressing her feet to the back of my chair. I turned around several times, yet she did not get the hint. I did not make a fuss since I sense I had a bad streak that night with AA, so I just did the best I can to lean forward and not let that bother me.

It was wonderful upgrading to first. Plane was so cold thou. Crew was great. Wish there was a food option in first for such a long flight. Doesnt matter the time of day. Chintzy.

Boarding went fine, the plane was clean, and the crew was very friendly. Seats were a bit cramped, but that seems to be typical on all airlines anymore. Cookies and pretzels were offered as were beverages - the usual. I’d fly American again.

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

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

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.

The takeoff was the smoothest I've ever experienced on any airline and this is the first time I've flown on frontier so this was an extremely pleasant surprise!

A lady asked to stop the flight after the tunnel pulled away and we began to depart a flight that was already hours late. The attendance respectfully stopped the the plane and had the tunnel return. After the tunnel returned the passenger claimed to have changed her mind . The tunnel was then put in reverse and the passenger remained on the plane .. They should have sent the sick passenger off the plane like initially replaced. They existed a couple off the plane prior to that situation.. So.. all and all.. it was a long and flight.. .

We understand and comply with Frontier’s bag sizes. We’ve had some problems in past while having to await other passengers who do not understand the baggage restrictions or have not prepaid and that is usually our biggest concern (others delaying us) with flying Frontier. Flying OUT of ONT, however, has always been a great experience. I’ve also noted even on delayed Frontier flights very knowledgeable pilots who manage expectations well.

Long lines, rude staff, everything that's offered you have to pay for.

The last time I flew Frontier was in the 1960s when it was a “real” airline. We flew this time because of the price & schedule. As the saying goes, you get what you pay for.

30 minute delay due to boarding and settling of a family.

Flight was fine, but the legroom between seats for taller passengers is very tight and bad on the knees. I t is very hard to find an angle, that works, especially on a long flight!!!

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

Information on your arrival and departure airports