£185 Cheap Flights from Baltimore (BWI) to Ontario Intl. Airport (ONT)

View £185 flight on Fri, 29 May 2026Opens in a new window

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

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Cheap Flights from Baltimore (BWI) to Ontario Intl. Airport (ONT)

Prices were available within the past 7 days and start at £185 for one-way flights and £335 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

American Airlines
Sat, 16 May - Sat, 23 May
BWI
Baltimore
ONT
Ontario
£335 Return, just found
£335
Return
just found
Select American Airlines flight, departing Sat, 16 May from Baltimore to Ontario, returning Sat, 23 May, priced at £335 just found
Alaska Airlines
Sun, 10 May - Fri, 15 May
BWI
Baltimore
ONT
Ontario
£375 Return, found 4 days ago
£375
Return
found 4 days ago
Select Alaska Airlines flight, departing Sun, 10 May from Baltimore to Ontario, returning Fri, 15 May, priced at £375 found 4 days ago
Delta
Sat, 9 May - Wed, 20 May
BWI
Baltimore
ONT
Ontario
£388 Return, found 4 days ago
£388
Return
found 4 days ago
Select Delta flight, departing Sat, 9 May from Baltimore to Ontario, returning Wed, 20 May, priced at £388 found 4 days ago
Delta
Tue, 12 May - Tue, 19 May
BWI
Baltimore
ONT
Ontario
£390 Return, found 11 hours ago
£390
Return
found 11 hours ago
Select Delta flight, departing Tue, 12 May from Baltimore to Ontario, returning Tue, 19 May, priced at £390 found 11 hours ago
American Airlines
Mon, 11 May - Mon, 18 May
BWI
Baltimore
ONT
Ontario
£404 Return, just found
£404
Return
just found
Select American Airlines flight, departing Mon, 11 May from Baltimore to Ontario, returning Mon, 18 May, priced at £404 just found
Delta
Mon, 11 May - Mon, 18 May
BWI
Baltimore
ONT
Ontario
£405 Return, just found
£405
Return
just found
Select Delta flight, departing Mon, 11 May from Baltimore to Ontario, returning Mon, 18 May, priced at £405 just found
Alaska Airlines
Wed, 13 May - Fri, 22 May
BWI
Baltimore
ONT
Ontario
£407 Return, found 3 days ago
£407
Return
found 3 days ago
Select Alaska Airlines flight, departing Wed, 13 May from Baltimore to Ontario, returning Fri, 22 May, priced at £407 found 3 days ago
Alaska Airlines
Tue, 12 May - Tue, 19 May
BWI
Baltimore
ONT
Ontario
£408 Return, found 11 hours ago
£408
Return
found 11 hours ago
Select Alaska Airlines flight, departing Tue, 12 May from Baltimore to Ontario, returning Tue, 19 May, priced at £408 found 11 hours ago
Delta
Sat, 16 May - Sat, 23 May
BWI
Baltimore
ONT
Ontario
£416 Return, just found
£416
Return
just found
Select Delta flight, departing Sat, 16 May from Baltimore to Ontario, returning Sat, 23 May, priced at £416 just found
United
Sat, 16 May - Sat, 23 May
BWI
Baltimore
ONT
Ontario
£417 Return, just found
£417
Return
just found
Select United flight, departing Sat, 16 May from Baltimore to Ontario, returning Sat, 23 May, priced at £417 just found

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. Average driving time to city centre is 42 minutes. Flights from £351
SNA
John Wayne
Average driving time to city centre42 min
Flights from £351

Frequently asked questions

How much does a flight from Baltimore, MD (BWI-Baltimore Washington Intl. Thurgood Marshall) to Ontario, CA (ONT-Los Angeles - Ontario Intl.) cost?
One-way flights typically cost between £333 and £1,060 and return flights often range between £333 and £1,060. Flight prices vary based on the month and day of the week you want to travel, as well as the airline and how far in advance you book your ticket. Filter your search on Expedia by "Price (lowest to highest)" to see the cheapest fares first, and use the Price Tracking tool to receive alerts when Anaa (AAA) to Toronto, ON (YYZ-Pearson Intl.) ticket fares go up or down.
What is the cheapest month to fly from Baltimore, MD (BWI-Baltimore Washington Intl. Thurgood Marshall) to Ontario, CA (ONT-Los Angeles - Ontario Intl.)?
August is typically the cheapest month to fly from Baltimore, MD (BWI-Baltimore Washington Intl. Thurgood Marshall) to Ontario, CA (ONT-Los Angeles - Ontario Intl.), with average return fares of approximately £304. This is about 11% lower than the average price throughout the year. August often sees lower prices as it's a shoulder month for travel, falling after the peak summer rush but before the holiday season. Other cheap months to fly from Baltimore, MD (BWI-Baltimore Washington Intl. Thurgood Marshall) to Ontario, CA (ONT-Los Angeles - Ontario Intl.) include February and September.
Which airlines fly direct from Baltimore, MD (BWI-Baltimore Washington Intl. Thurgood Marshall) to Ontario, CA (ONT-Los Angeles - Ontario Intl.)?
Enter BWI to ONT and your travel dates, then apply the 'Nonstop' filter to see only direct flights.
How do I find cheap flights from Baltimore, MD (BWI-Baltimore Washington Intl. Thurgood Marshall) to Ontario, CA (ONT-Los Angeles - Ontario Intl.)?
To find a cheap flight from Baltimore, MD (BWI-Baltimore Washington Intl. Thurgood Marshall) to Ontario, CA (ONT-Los Angeles - Ontario Intl.), be flexible with your dates. Traveling outside of peak vacation months and booking a mid-week flight can help you save. Early morning and late night flights are often more affordable, too. Expedia allows you to compare flight times, airlines and routes all in one place to find low fares. You can also set up Price Tracking and receive alerts when fares go up or down.
What is the best airline to fly with from Baltimore, MD (BWI-Baltimore Washington Intl. Thurgood Marshall) to Ontario, CA (ONT-Los Angeles - Ontario Intl.)?
The best airline to fly with from Baltimore, MD (BWI-Baltimore Washington Intl. Thurgood Marshall) (BWI) to Ontario, CA (ONT-Los Angeles - Ontario Intl.) (ONT) will differ from traveller to traveller. If you like to fly early, WN offers early morning flights. If price is the most important factor, WN typically offers the lowest fares. WN offers the most daily flights from Baltimore, MD (BWI-Baltimore Washington Intl. Thurgood Marshall) (BWI) to Ontario, CA (ONT-Los Angeles - Ontario Intl.) (ONT), which is great if flexibility is what you value most. The best carrier for this journey could also be the one you have a loyalty membership with, as flying with that airline or another airline within the same alliance could help you collect points or enjoy lounge access.
What is the best time to fly from Baltimore, MD (BWI-Baltimore Washington Intl. Thurgood Marshall) to Ontario, CA (ONT-Los Angeles - Ontario Intl.)?
Based on booking data from the past year, the cheapest months to fly from Baltimore Washington International Thurgood Marshall (BWI) to Los Angeles - Ontario International (ONT) are typically August and September, with average return flights around £304. While March is a popular month for this route, offering plenty of flight options, it's not the cheapest. If you're looking for the best value, aiming for August or September will likely give you the lowest fares.
How many flights per day from Baltimore, MD (BWI-Baltimore Washington Intl. Thurgood Marshall) to Ontario, CA (ONT-Los Angeles - Ontario Intl.)?
While there might be a few direct flights on some days, you'll find around 75 connecting flights per day from Baltimore Washington Intl. Thurgood Marshall (BWI) to Los Angeles - Ontario Intl. (ONT). This gives you plenty of options to choose from! Some common connection points include Seattle - Tacoma Intl. (SEA), O'Hare Intl. (ORD), and Portland Intl. (PDX).
What is the earliest flight from Baltimore, MD (BWI-Baltimore Washington Intl. Thurgood Marshall) to Ontario, CA (ONT-Los Angeles - Ontario Intl.)?
The earliest flight from Baltimore Washington Intl. Thurgood Marshall (BWI) to Los Angeles - Ontario Intl. (ONT) typically departs at approximately 5:00 AM local time. This service is operated by American Airlines and is seasonal, active only in December. An early departure like this can help you maximise your time at your destination. To compare early flights on Expedia, select the "Early Morning" and "Morning" filters in your search.
What day of the week has the most flights from Baltimore, MD (BWI-Baltimore Washington Intl. Thurgood Marshall) to Ontario, CA (ONT-Los Angeles - Ontario Intl.)?
You'll typically find the most flights from Baltimore Washington Intl. Thurgood Marshall (BWI) to Los Angeles - Ontario Intl. (ONT) on a Friday, with around 49 flights available. This gives you plenty of options for your travel plans. Major airlines on this route include Southwest Airlines, United Airlines, and Delta Air Lines. Friday offers notably more flight options compared to other days of the week.
What are the most popular departure times for flights from Baltimore, MD (BWI-Baltimore Washington Intl. Thurgood Marshall) to Ontario, CA (ONT-Los Angeles - Ontario Intl.)?
The most popular departure times for flights from Baltimore Washington Intl. Thurgood Marshall (BWI) to Los Angeles - Ontario Intl. (ONT) are in the early morning, from 6am to 9am. About 37% of passengers prefer this time. Many major carriers, including Southwest Airlines and Delta Air Lines, offer flights during this window. This timing works well because it allows you to get an early start on your travel day and arrive at your destination with plenty of time left.
How long does it take to fly from Baltimore, MD (BWI-Baltimore Washington Intl. Thurgood Marshall) to Ontario, CA (ONT-Los Angeles - Ontario Intl.)?
Direct flights from BWI to ONT usually take about 5 hours 30 minutes, traveling roughly 2,277 miles. If you opt for a connecting flight, expect to add around 2 hours 20 minutes to your journey. Keep in mind that actual flight times can vary due to wind patterns, weather, and air traffic.
Can you fly business or first class from Baltimore, MD (BWI-Baltimore Washington Intl. Thurgood Marshall) to Ontario, CA (ONT-Los Angeles - Ontario Intl.)?
Select the "Business class" and "First class" filters when looking for BWI to ONT flights on Expedia. This is the easiest way to compare prices, routes and flight times for your trip.
How do I earn miles on a Baltimore, MD (BWI-Baltimore Washington Intl. Thurgood Marshall) to Ontario, CA (ONT-Los Angeles - Ontario Intl.) flight with Expedia?
It's easy to earn miles on a Baltimore, MD (BWI-Baltimore Washington Intl. Thurgood Marshall) to Ontario, CA (ONT-Los Angeles - Ontario Intl.) flight when you book with Expedia. Before you confirm your booking, simply select your frequent flyer program and enter your program number. As a member of One Key™, you can also earn OneKeyCash™* on top of your airline miles when you book with Expedia. *Excludes taxes and fees. OneKeyCash is not redeemable for cash and can only be used on Expedia and other participating brands.
What airports do you fly into for Ontario from Baltimore Washington Intl. Thurgood Marshall (BWI)?
From Baltimore Washington Intl. Thurgood Marshall (BWI), you can fly directly into Los Angeles - Ontario Intl. (ONT) to reach Ontario. Some flights may connect through major hubs like O'Hare Intl. (ORD), Seattle - Tacoma Intl. (SEA), Denver Intl. (DEN) before reaching Ontario. Compare routes and airports on Expedia to find the best flight options for your travel plans.
Is it cheaper to buy a plane ticket from Baltimore, MD (BWI-Baltimore Washington Intl. Thurgood Marshall) to Ontario, CA (ONT-Los Angeles - Ontario Intl.) at the last minute?
Typically, booking a last minute flight from Baltimore, MD (BWI-Baltimore Washington Intl. Thurgood Marshall) to Ontario, CA (ONT-Los Angeles - Ontario Intl.) will be more expensive than booking in advance. As the departure date approaches, there are usually fewer seats available which can drive up the cost. However, if there's some wiggle room with your travel dates and times, you could bag a cheap last-minute fare.
Is it cheaper to book a Baltimore, MD (BWI-Baltimore Washington Intl. Thurgood Marshall) to Ontario, CA (ONT-Los Angeles - Ontario Intl.) flight and hotel package?
Securing a Baltimore, MD (BWI-Baltimore Washington Intl. Thurgood Marshall) to Ontario, CA (ONT-Los Angeles - Ontario Intl.) flight and hotel package is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Select from our extensive range of stays and then add flights, activities and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Baltimore, MD (BWI-Baltimore Washington Intl. Thurgood Marshall) to Ontario, CA (ONT-Los Angeles - Ontario Intl.)?
If you booked your Baltimore, MD (BWI-Baltimore Washington Intl. Thurgood Marshall) to Ontario, CA (ONT-Los Angeles - Ontario Intl.) flight within the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of ticket you have, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you'd like more information.

Travel information

Origin airport
Baltimore Washington Intl. Thurgood Marshall
Destination airport
Ontario Intl. Airport
Airlines serving
Alaska Airlines, American Airlines, Delta, United
Return price
£335
Distance
3643 km
Average flight time
5 hours 30 mins

Book with confidence

Compare flights from Baltimore to Ontario Intl. Airport easily and book with confidence

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

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 Baltimore Washington Intl. Thurgood Marshall (BWI) to Ontario Intl. Airport (ONT)

The easiest way to view the best deals on flights from Baltimore to Ontario Intl. Airport 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 Baltimore Washington Intl. Thurgood Marshall to Ontario Intl. Airport start at just £335 and range up to £417.  

To find an even better deal, try  

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

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

We cater for all flight types, cabin classes and airlines. So whether you’re booking flights from Baltimore Washington Intl. Thurgood Marshall to Ontario Intl. Airport 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.  

Compare flights from Baltimore to Ontario Intl. Airport easily and book with confidence

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