$96 Cheap Flights from Baltimore (BWI) to Ontario (ONT)

View $96 flight on Thu, Nov 13, 2025Opens in a new window

Popular airlines from Baltimore Washington Intl. Airport (BWI) to Los Angeles - Ontario Intl. Airport (ONT)

Cheap Flights from Baltimore to Ontario (BWI-ONT)

Prices were available within the past 7 days and start at $96 for one-way flights and $236 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frontier Airlines
Thu, Oct 30 - Mon, Nov 10
BWI
Baltimore
ONT
Ontario
$236 Roundtrip, found 18 hours ago
$236
Roundtrip
found 18 hours ago
Select Frontier Airlines flight, departing Thu, Oct 30 from Baltimore to Ontario, returning Mon, Nov 10, priced at $236 found 18 hours ago
Frontier Airlines
Thu, Nov 13 - Thu, Nov 20
BWI
Baltimore
ONT
Ontario
$259 Roundtrip, found 2 hours ago
$259
Roundtrip
found 2 hours ago
Select Frontier Airlines flight, departing Thu, Nov 13 from Baltimore to Ontario, returning Thu, Nov 20, priced at $259 found 2 hours ago
Frontier Airlines
Thu, Dec 4 - Thu, Dec 11
BWI
Baltimore
ONT
Ontario
$261 Roundtrip, found 1 day ago
$261
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Thu, Dec 4 from Baltimore to Ontario, returning Thu, Dec 11, priced at $261 found 1 day ago
Frontier Airlines
Thu, Nov 13 - Thu, Nov 20
BWI
Baltimore
ONT
Ontario
$265 Roundtrip, found 2 hours ago
$265
Roundtrip
found 2 hours ago
Select Frontier Airlines flight, departing Thu, Nov 13 from Baltimore to Ontario, returning Thu, Nov 20, priced at $265 found 2 hours ago
Alaska Airlines
Thu, Dec 4 - Thu, Dec 11
BWI
Baltimore
ONT
Ontario
$270 Roundtrip, found 1 day ago
$270
Roundtrip
found 1 day ago
Select Alaska Airlines flight, departing Thu, Dec 4 from Baltimore to Ontario, returning Thu, Dec 11, priced at $270 found 1 day ago
Frontier Airlines
Thu, Jan 22 - Thu, Jan 29
BWI
Baltimore
ONT
Ontario
$272 Roundtrip, found 13 hours ago
$272
Roundtrip
found 13 hours ago
Select Frontier Airlines flight, departing Thu, Jan 22 from Baltimore to Ontario, returning Thu, Jan 29, priced at $272 found 13 hours ago
Frontier Airlines
Thu, Nov 13 - Tue, Nov 18
BWI
Baltimore
ONT
Ontario
$274 Roundtrip, found 4 days ago
$274
Roundtrip
found 4 days ago
Select Frontier Airlines flight, departing Thu, Nov 13 from Baltimore to Ontario, returning Tue, Nov 18, priced at $274 found 4 days ago
American Airlines
Thu, Dec 11 - Sun, Dec 14
BWI
Baltimore
ONT
Ontario
$327 Roundtrip, just found
$327
Roundtrip
just found
Select American Airlines flight, departing Thu, Dec 11 from Baltimore to Ontario, returning Sun, Dec 14, priced at $327 just found
Delta
Fri, Dec 12 - Sun, Dec 14
BWI
Baltimore
ONT
Ontario
$327 Roundtrip, just found
$327
Roundtrip
just found
Select Delta flight, departing Fri, Dec 12 from Baltimore to Ontario, returning Sun, Dec 14, priced at $327 just found
United
Mon, Dec 8 - Sun, Dec 14
BWI
Baltimore
ONT
Ontario
$327 Roundtrip, found 4 hours ago
$327
Roundtrip
found 4 hours ago
Select United flight, departing Mon, Dec 8 from Baltimore to Ontario, returning Sun, Dec 14, priced at $327 found 4 hours ago

Find the cheapest month to fly from Baltimore (BWI) to Ontario (ONT)

April is typically the cheapest month to fly

From $160 - $627 per traveler.

Alternative airports near Ontario

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to John Wayne SNA. Cheapest option available. Average driving time to city center is 42 minutes. Flights from $286
SNA
John Wayne
Cheapest
Average driving time to city center42 min
Flights from $286

Frequently asked questions

How much does a flight from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Los Angeles - Ontario Intl. Airport (ONT) cost?
Lock in a cheap one-way flight from $96 or cheap return flight from $236 from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Los Angeles - Ontario Intl. Airport (ONT) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight deals on this route.
What is the cheapest month to fly from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Los Angeles - Ontario Intl. Airport (ONT)?
October is the cheapest month to fly from BWI to ONT. Traveling during an off-peak travel window is often the key to landing a great deal.
What is the cheapest airline that flies from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Los Angeles - Ontario Intl. Airport (ONT)?
Use the filters on Expedia to compare airlines and find the most affordable carrier that'll fly you from BWI to ONT. Then, sort your results by "Price (lowest to highest)" to snap up a great deal.
How many flights per day from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Los Angeles - Ontario Intl. Airport (ONT)?
Direct flights from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Los Angeles - Ontario Intl. Airport (ONT) aren't available daily, so you'll need to take a flight with a layover. Explore your options with Expedia's filter tool. Enter your dates and click on either "1 Stop" or "2+ Stops."
What day of the week has the most flights from BWI to ONT?
Usually you'll find the most flight options available on a Friday. Tuesdays tend to be the quietest.* However, this can vary depending on the airline, season and other factors.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Los Angeles - Ontario Intl. Airport (ONT)?
To reach Los Angeles - Ontario Intl. Airport (ONT) on time, book a flight that leaves from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) before 3 PM. The likelihood of cancellations is 22% higher, on average, for departures after this time.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
What airports do you fly into for Ontario from Baltimore Washington Intl. Thurgood Marshall Airport (BWI)?
If you're traveling on a direct flight from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Ontario, Los Angeles Intl. Airport (LAX) is the only airport you can land at.
Is it cheaper to buy a plane ticket from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Los Angeles - Ontario Intl. Airport (ONT) last-minute?
Waiting until right before your break to book your flight from BWI to ONT often results in higher prices. While you may come across some last-minute deals, they're not always guaranteed. Be flexible with your itinerary for a better chance of landing a bargain.
Is it cheaper to book a BWI to ONT flight and hotel package?
You'll generally save money by booking a BWI to ONT flight and hotel package compared to booking separately. In fact, travelers could save hundreds of dollars by bundling with Expedia. And it's easy to manage everything in one convenient place. After choosing your preferred accommodations and flights, consider other add-ons like activities, tours and car rentals.
Can I cancel or change the date of my flight from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Los Angeles - Ontario Intl. Airport (ONT)?
It's usually possible to reschedule or cancel your BWI to ONT flight. However, if it's been more than 24 hours since booking, additional charges may apply. Refer to your airline's policies in your itinerary to see what changes are allowed and whether any costs are involved. You'll also find more information on our Customer Service portal.

Travel information

Origin airport
Baltimore Washington Intl. Thurgood Marshall
Destination airport
Los Angeles - Ontario Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Frontier Airlines, Hawaiian Airlines, Southwest Airlines, United
Roundtrip price
$236
Distance
2277 mi
Average flight time
5 hours 30 mins

Book with confidence

Baltimore to Ontario Flights

The cheapest times to fly from Baltimore to Ontario

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Baltimore to Ontario are during the month of October. You can find some of the cheapest flights from Baltimore to Ontario with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Baltimore to Ontario

Sunday is one of the best days to book for cheap flights from Baltimore to Ontario: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Baltimore to Ontario

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Baltimore to Ontario in 2025. You can also book with separate airlines for your outbound and return journeys, from $96 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Baltimore to Ontario flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Baltimore to Ontario airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Baltimore to Ontario Flights

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*Available to One Key members.