$65 Cheap Frontier Airlines flights Baltimore (BWI) to Ontario (ONT)

View $65 flight on Mon, Jan 12, 2026Opens in a new window

$65 Cheap Frontier Airlines flights Baltimore (BWI) to Ontario (ONT)

Prices were available within the past 7 days and start at $65 for one-way flights and $138 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frontier Airlines
Thu, Jan 22 - Thu, Jan 29
BWI
Baltimore
ONT
Ontario
$138 Roundtrip, found 2 days ago
$138
Roundtrip
found 2 days ago
Select Frontier Airlines flight, departing Thu, Jan 22 from Baltimore to Ontario, returning Thu, Jan 29, priced at $138 found 2 days ago
Frontier Airlines
Mon, Jan 12 - Thu, Jan 15
BWI
Baltimore
ONT
Ontario
$140 Roundtrip, just found
$140
Roundtrip
just found
Select Frontier Airlines flight, departing Mon, Jan 12 from Baltimore to Ontario, returning Thu, Jan 15, priced at $140 just found
Frontier Airlines
Fri, Jan 9 - Thu, Jan 15
BWI
Baltimore
ONT
Ontario
$144 Roundtrip, just found
$144
Roundtrip
just found
Select Frontier Airlines flight, departing Fri, Jan 9 from Baltimore to Ontario, returning Thu, Jan 15, priced at $144 just found
Frontier Airlines
Sun, Jan 18 - Sun, Jan 25
BWI
Baltimore
ONT
Ontario
$148 Roundtrip, just found
$148
Roundtrip
just found
Select Frontier Airlines flight, departing Sun, Jan 18 from Baltimore to Ontario, returning Sun, Jan 25, priced at $148 just found
Frontier Airlines
Sun, Dec 7 - Sun, Jan 18
BWI
Baltimore
ONT
Ontario
$152 Roundtrip, found 22 hours ago
$152
Roundtrip
found 22 hours ago
Select Frontier Airlines flight, departing Sun, Dec 7 from Baltimore to Ontario, returning Sun, Jan 18, priced at $152 found 22 hours ago
Frontier Airlines
Fri, Jan 9 - Sun, Jan 18
BWI
Baltimore
ONT
Ontario
$156 Roundtrip, found 18 hours ago
$156
Roundtrip
found 18 hours ago
Select Frontier Airlines flight, departing Fri, Jan 9 from Baltimore to Ontario, returning Sun, Jan 18, priced at $156 found 18 hours ago

Frequently asked questions

How much is a Frontier Airlines flight from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Los Angeles - Ontario Intl. Airport (ONT)?
You can discover cheap return Frontier Airlines flights from $138 from BWI to ONT by filtering your results from "Price (lowest to highest)" on Expedia. Or look for bargains from $65 for a one-way journey.**These prices were available on Expedia within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.
What is the cheapest month to fly from BWI to ONT with Frontier Airlines?
January is one of the most affordable months to jet off to Ontario with Frontier Airlines. You could also find fantastic deals on one-way and round-trip tickets in April.
What is the cheapest time to book flights from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Los Angeles - Ontario Intl. Airport (ONT) with Frontier Airlines?
Start searching one to three months ahead of your departure date to get cheaper fares on Frontier Airlines flights from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Los Angeles - Ontario Intl. Airport (ONT). You can save 25% by booking your domestic flight 34 to 86 days in advance compared to last-minute reservations made 6 to 12 days out. You could also reduce costs by buying your fare on a Sunday, as it's 6% cheaper on average than a Monday, the most expensive day to book.* Get your timing right, and you can enjoy significant savings on domestic trips.*Ideal booking window recommendation is based on average round-trip ticket prices for January through November for 2024. Best day of the week to book recommendation is based on average round-trip ticket prices for January through October 2024. All data sourced from ARC's global airline sales database.
Does Frontier Airlines fly nonstop from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Los Angeles - Ontario Intl. Airport (ONT)?
Click on the "Nonstop" filter when browsing for direct Frontier Airlines flights from BWI to ONT. It's also a good way to compare other carriers servicing the same direct route.
What is the earliest Frontier Airlines flight from BWI to ONT?
To find the earliest departure from BWI to ONT with Frontier Airlines, filter your search by "Morning" and "Early Morning." Booking an early flight usually means cancellations are less likely.**Most reliable time of the day recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
What airports does Frontier Airlines fly into in Ontario?
Frontier Airlines flights from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Ontario arrive at Los Angeles - Ontario Intl. Airport (ONT). This is the main gateway here.
Why fly with Frontier Airlines from BWI to ONT?
A rewarding loyalty program and the ability to rack up points through Frontier Miles are the start of the reasons to fly from BWI to ONT with Frontier Airlines. Plus, when you sign up to Expedia's free One Key™ program, you can earn OneKeyCash™* on top of any airline loyalty program earnings. You can put it toward your future trips.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.
Can I change or cancel my Frontier Airlines flight from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Los Angeles - Ontario Intl. Airport (ONT)?
It's generally possible to change or cancel your flight, although there may be a charge if your booking was made more than 24 hours ago. Prefer to keep your options open? Use Expedia's "No cancel fee" and "Changes included" filters to find flights that won't charge extra if you need to adjust your plans. To make changes, head to "Trips," select your flight and click on "Manage Booking" for more details.

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
Popular airline
Southwest Airlines
Distance
2277 mi
Average flight time
5 hours 35 mins
*Available to One Key members.