£112 Cheap Flights from Ontario (ONT) to Baltimore (BWI)

View £112 flight on Tue, 30 Sep 2025Opens in a new window

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

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

Prices were available within the past 7 days and start at £112 for one-way flights and £365 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

American Airlines
Fri, 11 Jul - Sat, 12 Jul
ONT
Ontario
BWI
Baltimore
£365 Return, found 2 days ago
£365
Return
found 2 days ago
Select American Airlines flight, departing Fri, 11 Jul from Ontario to Baltimore, returning Sat, 12 Jul, priced at £365 found 2 days ago
American Airlines
Fri, 11 Jul - Sat, 12 Jul
ONT
Ontario
BWI
Baltimore
£439 Return, found 2 days ago
£439
Return
found 2 days ago
Select American Airlines flight, departing Fri, 11 Jul from Ontario to Baltimore, returning Sat, 12 Jul, priced at £439 found 2 days ago
American Airlines
Fri, 11 Jul - Sat, 12 Jul
ONT
Ontario
BWI
Baltimore
£512 Return, found 2 days ago
£512
Return
found 2 days ago
Select American Airlines flight, departing Fri, 11 Jul from Ontario to Baltimore, returning Sat, 12 Jul, priced at £512 found 2 days ago

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

October is typically the cheapest month to fly

From £116 - £401 per traveller.

Graph displaying average flight prices per month

Flight from Ontario to Baltimore route information
Origin airport
Los Angeles - Ontario Intl.
Destination airport
Baltimore Washington Intl. Thurgood Marshall
Return price
£364
Distance
3643 km
Average flight time
4 hours 50 mins

Compare flights from Ontario to Baltimore easily and book with confidence

For travelling on business or for pleasure, Expedia makes it easy to book your flights from Ontario to Baltimore. Operating between them flights per day, 20 airlines cover the route. And fly direct, getting you to Baltimore Washington Intl. Thurgood Marshall in just hours. If you have a preferred carrier, use our advanced search tool to find the right flight from Los Angeles - Ontario Intl. to Baltimore Washington Intl. Thurgood Marshall.  

To make things even better, in the advanced search, you can also choose to fly economy, premium economy, business or first class, select your maximum number of stops, and pick your preferred departure and arrival time. You can also opt for refundable and direct flights. 

Grab a great deal on your flight from Los Angeles - Ontario Intl. (ONT) to Baltimore Washington Intl. Thurgood Marshall (BWI)

The easiest way to view the best deals on flights from Ontario to Baltimore today is to enter your travel dates and hit search. From here, you can sort your results by price to see the cheapest flights first. Right now, return flights from Los Angeles - Ontario Intl. to Baltimore Washington Intl. Thurgood Marshall start at just £365 and range up to £512.  

To find an even better deal, try  

  • being flexible on your dates – midweek flights can be cheaper
  • looking for other airports near Ontario and Baltimore
  • booking your flight during July, the cheapest month on this route
  • varying your flight times – early morning and late at night are sometimes cheaper 

Why you should book your Ontario to Baltimore flight with Expedia!

We cater for all flight types, cabin classes and airlines. So whether you’re booking flights from Los Angeles - Ontario Intl. to Baltimore Washington Intl. Thurgood Marshall for a budget break or a business trip with a bit of pleasure thrown in, we make it easy to secure the seat that’s right for you.  

Thanks to our supersized inventory that offers great choice all in one place, you know you’ll get a great deal with Expedia. Especially if you bundle your flight together with your hotel, you will unlock amazing savings. For added peace of mind, you can choose flexible bookings or filter to find refundable options, so you won’t pay a fee to change your flight.  

Frequently asked questions

How much is a flight from Los Angeles - Ontario Intl. Airport (ONT) to BWI Marshall?
Start packing your suitcase, because round-trip journeys between ONT and BWI start from £365. That's based on fares advertised within the last 7 days on Expedia for flights departing within the next year. Prices can change quickly, so book now to lock in the best deal. Prices and availability are subject to change. Additional terms apply.
Do I need to pay a cancellation fee if I cancel my flight from Ontario Airport to BWI?
Most flights can be conveniently cancelled online, but whether or not you incur a fee depends on your airline. If you do have to cancel your trip, follow the instructions in the Customer Service Portal.
How do I find cheap flights from Los Angeles - Ontario Intl. Airport (ONT) to Baltimore Washington Intl. Thurgood Marshall Airport (BWI) that have flexible change policies?
Many airlines offer the option to reschedule your flight without a change fee. All you pay is the difference between the original flight and the new flight. When you're searching for Los Angeles - Ontario Intl. Airport (ONT) to BWI Airport flights, you'll see a "no change fees" filter for you to select.
How far is the flight from Ontario Airport to BWI Airport?
The flight distance between Ontario Airport (ONT) and BWI (BWI) is 3,700 kilometres. Work your way through your travel song playlist or make a start on the latest bestseller and the trip will whiz by.
Which airlines fly direct from ONT to Baltimore Washington Intl. Thurgood Marshall Airport (BWI)?
You won't find any airlines flying directly between Ontario Airport and BWI Airport, so be ready to make at least one stop on your journey. A layover, whether short or long, can be a nice way to break up a trip!
Are Ontario Airport to BWI flight tickets cheaper when they're purchased at the last minute?
Last-minute bookings from Los Angeles - Ontario Intl. Airport (ONT) to Baltimore Washington Intl. Thurgood Marshall Airport (BWI) can be hit-or-miss. You may be able to find a bargain, but then again, you could miss out altogether! If you'd rather play it safe and start planning your trip ahead of time, Expedia compares flight deals up to 12 months in advance. Just keep in mind that not all airlines release their prices that far in advance. Our advice? Check back often as prices are updated frequently.

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Baltimore Airports

Washington

Ontario Airports

Los Angeles

Los Angeles Intl. to Baltimore
£172.10

Orange County

Burbank

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