$114 Cheap Flights from Ontario (ONT) to Baltimore (BWI)

View $114 flight on Thu, Sep 25, 2025Opens in a new window

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

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Cheap Flights from Ontario to Baltimore (ONT-BWI)

Prices were available within the past 7 days and start at $114 for one-way flights and $227 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Sat, Sep 20 - Sat, Sep 27
ONT
Ontario
BWI
Baltimore
$227 Roundtrip, just found
$227
Roundtrip
just found
Select United flight, departing Sat, Sep 20 from Ontario to Baltimore, returning Sat, Sep 27, priced at $227 just found
American Airlines
Sat, Sep 20 - Sat, Sep 27
ONT
Ontario
BWI
Baltimore
$227 Roundtrip, just found
$227
Roundtrip
just found
Select American Airlines flight, departing Sat, Sep 20 from Ontario to Baltimore, returning Sat, Sep 27, priced at $227 just found
Southwest Airlines
Thu, Nov 13 - Tue, Nov 18
ONT
Ontario
BWI
Baltimore
$227 Roundtrip, found 6 hours ago
$227
Roundtrip
found 6 hours ago
Select Southwest Airlines flight, departing Thu, Nov 13 from Ontario to Baltimore, returning Tue, Nov 18, priced at $227 found 6 hours ago
American Airlines
Wed, Oct 8 - Fri, Oct 10
ONT
Ontario
BWI
Baltimore
$227 Roundtrip, found 2 hours ago
$227
Roundtrip
found 2 hours ago
Select American Airlines flight, departing Wed, Oct 8 from Ontario to Baltimore, returning Fri, Oct 10, priced at $227 found 2 hours ago
Southwest Airlines
Thu, Nov 6 - Sun, Nov 9
ONT
Ontario
BWI
Baltimore
$227 Roundtrip, found 11 hours ago
$227
Roundtrip
found 11 hours ago
Select Southwest Airlines flight, departing Thu, Nov 6 from Ontario to Baltimore, returning Sun, Nov 9, priced at $227 found 11 hours ago
American Airlines
Wed, Oct 8 - Wed, Oct 15
ONT
Ontario
BWI
Baltimore
$228 Roundtrip, found 3 hours ago
$228
Roundtrip
found 3 hours ago
Select American Airlines flight, departing Wed, Oct 8 from Ontario to Baltimore, returning Wed, Oct 15, priced at $228 found 3 hours ago
United
Sat, Sep 20 - Sat, Sep 27
ONT
Ontario
BWI
Baltimore
$230 Roundtrip, just found
$230
Roundtrip
just found
Select United flight, departing Sat, Sep 20 from Ontario to Baltimore, returning Sat, Sep 27, priced at $230 just found
United
Wed, Oct 8 - Wed, Oct 15
ONT
Ontario
BWI
Baltimore
$232 Roundtrip, found 3 hours ago
$232
Roundtrip
found 3 hours ago
Select United flight, departing Wed, Oct 8 from Ontario to Baltimore, returning Wed, Oct 15, priced at $232 found 3 hours ago
Delta
Thu, Sep 18 - Mon, Sep 22
ONT
Ontario
BWI
Baltimore
$252 Roundtrip, found 4 hours ago
$252
Roundtrip
found 4 hours ago
Select Delta flight, departing Thu, Sep 18 from Ontario to Baltimore, returning Mon, Sep 22, priced at $252 found 4 hours ago
Frontier Airlines
Thu, Aug 21 - Mon, Aug 25
ONT
Ontario
BWI
Baltimore
$273 Roundtrip, found 1 day ago
$273
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Thu, Aug 21 from Ontario to Baltimore, returning Mon, Aug 25, priced at $273 found 1 day ago

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

October is typically the cheapest month to fly

From $158 - $559 per traveler.

Graph displaying average flight prices per month

Alternative airports near Baltimore

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

Select flight to Ronald Reagan Washington National DCA. Cheapest option available. Average driving time to city center is 57 minutes. Flights from $300
DCA
Ronald Reagan Washington National
Cheapest
Average driving time to city center57 min
Flights from $300
Flights from Ontario (ONT) to Baltimore (BWI)
Origin airport
Los Angeles - Ontario Intl.
Destination airport
Baltimore Washington Intl. Thurgood Marshall
Airlines serving
Alaska Airlines, American Airlines, Delta, Frontier Airlines, Hawaiian Airlines, Southwest Airlines, United
Roundtrip price
$226
Distance
2277 mi
Average flight time
7 hours 55 mins

Ontario to Baltimore Flights

The cheapest times to fly from Ontario to Baltimore

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 Ontario to Baltimore are during the month of September. You can find some of the cheapest flights from Ontario to Baltimore with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Ontario to Baltimore

Sunday is one of the best days to book for cheap flights from Ontario to Baltimore: 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 Ontario to Baltimore

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 Ontario to Baltimore in 2025. You can also book with separate airlines for your outbound and return journeys, from $114 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 Ontario to Baltimore 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 Ontario to Baltimore 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.

 

Frequently asked questions

How much does a flight from Los Angeles - Ontario Intl. Airport (ONT) to Baltimore Washington Intl. Thurgood Marshall Airport (BWI) cost?
Grab a cheap one-way flight from $114 or cheap return flight from $227 from Los Angeles - Ontario Intl. Airport (ONT) to Baltimore Washington Intl. Thurgood Marshall Airport (BWI) 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 Los Angeles - Ontario Intl. Airport (ONT) to Baltimore Washington Intl. Thurgood Marshall Airport (BWI)?
September is the most affordable month to fly from ONT to BWI. Timing your trip outside of the busy season is often the key to scoring lower fares.
Which airlines fly direct from Los Angeles - Ontario Intl. Airport (ONT) to Baltimore Washington Intl. Thurgood Marshall Airport (BWI)?
Direct flights aren't available from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Baltimore Washington Intl. Thurgood Marshall Airport (BWI). However, you can find other airports that have nonstop flights. Start your journey at Los Angeles Intl. Airport (LAX) and fly straight to Baltimore without layovers.
What is the cheapest airline that flies from Los Angeles - Ontario Intl. Airport (ONT) to Baltimore Washington Intl. Thurgood Marshall Airport (BWI)?
To find the cheapest airline flying from ONT to BWI, use Expedia's filter tool. Tailor your search based on your travel style, such as preferred carriers and seat class. You can then sort your results by "Price (lowest to highest)" to list the most affordable options first.
How many flights per day from Los Angeles - Ontario Intl. Airport (ONT) to Baltimore Washington Intl. Thurgood Marshall Airport (BWI)?
There aren't any daily direct flights available from Los Angeles - Ontario Intl. Airport (ONT) to Baltimore Washington Intl. Thurgood Marshall Airport (BWI). But you can book flights with layovers. Filter your search on Expedia to include one or two stops, and you'll be soaring above the clouds in no time.
What day of the week has the most flights from ONT to BWI?
You'll typically find Tuesday the quietest day for flights, while Fridays tend to be the busiest.* However this can vary from season to season and during public holidays or peak travel times.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Los Angeles - Ontario Intl. Airport (ONT) to Baltimore Washington Intl. Thurgood Marshall Airport (BWI)?
To reach Baltimore Washington Intl. Thurgood Marshall Airport (BWI) on schedule, book a flight that leaves Los Angeles - Ontario Intl. Airport (ONT) before 3 PM. The chance 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.
Is it cheaper to buy a plane ticket from Los Angeles - Ontario Intl. Airport (ONT) to Baltimore Washington Intl. Thurgood Marshall Airport (BWI) last-minute?
Last-minute bookings from ONT to BWI are generally more expensive. For the best rates, start searching for flights as early as possible. That being said, if you're flexible with your travel plans, you may find a cheap fare right before you leave.
Is it cheaper to book an ONT to BWI flight and hotel package?
Opting for an ONT to BWI flight and hotel package tends to be cheaper than booking separately. With Expedia, you can enjoy the convenience of organizing your trip in one place. Select from our extensive range of stays and then add activities, flights 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 Los Angeles - Ontario Intl. Airport (ONT) to Baltimore Washington Intl. Thurgood Marshall Airport (BWI)?
Usually, it's possible to cancel or reschedule your ONT to BWI flight. However, for bookings made more than 24 hours ago, additional fees may apply. Check your airline's policies in your itinerary to see what changes are possible and whether any costs are involved. You'll also find more details on our Customer Service portal.

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*Available to One Key members.