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Ontario

$73+ Cheap flights from Baltimore to Ontario (BWI - ONT)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 2/20. Fares are subject to change and may not be available on all flights or dates of travel.
BWI — ONT
Feb 25 — Mar 41
Wed 2/25
Wed 3/4
1 adult, Economy
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1. Tell us where you want to go

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Cheapflights Tip: The best prices from Baltimore/Washington to Ontario are usually found in August or November, booked 42 days in advance, depart on a Friday or Thursday and return on a Thursday

Cheap flight deals from Baltimore to Ontario

Cheapest flights from Baltimore to Ontario
Explore the most affordable flight options available from Baltimore to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 26, 2026.

This Kiwi.com deal was found by Cheapflights users on 1/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/277:06 pm
BWI
-
ONT
1 stop15h 20m
Frontier
Mon 3/22:06 pm
ONT
-
BWI
2 stops24h 07m
Frontier
Deal found 1/25$188
This Frontier deal was found by Cheapflights users on 1/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/210:34 am
BWI
-
ONT
1 stop11h 11m
Frontier
Wed 4/85:18 pm
ONT
-
BWI
1 stop13h 21m
Frontier
Deal found 1/23$209
This Kiwi.com deal was found by Cheapflights users on 1/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/277:06 pm
BWI
-
ONT
1 stop15h 20m
Multiple Airlines
Mon 3/21:18 pm
ONT
-
BWI
1 stop18h 09m
Multiple Airlines
Deal found 1/25$228
This Trip.com deal was found by Cheapflights users on 1/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/1910:57 am
BWI
-
ONT
1 stop28h 26m
Frontier
Thu 2/266:05 am
ONT
-
BWI
2 stops11h 13m
Frontier
Deal found 1/24$231
This Trip.com deal was found by Cheapflights users on 1/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/910:34 am
BWI
-
ONT
1 stop11h 11m
Frontier
Sun 4/198:26 am
ONT
-
BWI
1 stop23h 46m
Frontier
Deal found 1/24$251
This Frontier deal was found by Cheapflights users on 1/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/411:49 am
BWI
-
ONT
1 stop9h 56m
Frontier
Sat 4/117:40 pm
ONT
-
BWI
1 stop10h 59m
Frontier
Deal found 1/24$260
This Kiwi.com deal was found by Cheapflights users on 1/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/207:50 pm
BWI
-
ONT
1 stop14h 36m
Multiple Airlines
Mon 2/236:43 pm
ONT
-
BWI
2 stops12h 44m
Multiple Airlines
Deal found 1/25$264
This Kiwi.com deal was found by Cheapflights users on 1/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/2312:12 pm
BWI
-
ONT
2 stops28h 40m
Multiple Airlines
Fri 2/271:18 pm
ONT
-
BWI
1 stop18h 09m
Multiple Airlines
Deal found 1/24$265
This Kiwi.com deal was found by Cheapflights users on 1/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/207:50 pm
BWI
-
ONT
1 stop14h 36m
Multiple Airlines
Sat 2/218:09 pm
ONT
-
BWI
2 stops11h 18m
Multiple Airlines
Deal found 1/25$292
This Orbitz deal was found by Cheapflights users on 1/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/246:46 pm
BWI
-
ONT
1 stop19h 22m
Alaska Airlines
Tue 3/34:02 pm
ONT
-
BWI
1 stop22h 44m
Alaska Airlines
Deal found 1/25$297

Find flight deals from Baltimore to Ontario

Discover tips and strategies to find the most affordable flight options for your journey from Baltimore (BWI) to Ontario (ONT). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated January 26, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

Expedia
3 stars

Round-trip from

$188
(Kiwi.com)

One-way from

$73
(Trip.com)

Popular in

July

Cheapest in

August

Average price

$402
Provider with most accurate pricing for Baltimore/Washington-Ontario flight deals.
Search Deals
Provider most trusted by Cheapflights users for Baltimore/Washington-Ontario flights.
Search Deals
From Baltimore/Washington to Ontario
Search Deals
One-way flight from Baltimore/Washington to Ontario
Search Deals
High demand for flights, 1% potential price rise
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($6 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Baltimore to Ontario that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated January 26, 2026.
Use the filters below to find and compare flights from Baltimore to Ontario that are best for you.

Fly from

Baltimore

Fly to

Ontario

Route

Depart

Return

Price

BaltimoreOntario

BWI - ONT

BWIONT

Baltimore/Washington

Tue 2/24

6:00 am-1:54 pm

2 stops10h 54m

Ontario

Tue 3/3

7:30 am-10:53 pm

2 stops12h 23m

$334

BaltimoreOntario

BWI - ONT

BWIONT

Baltimore/Washington

Thu 3/5

5:04 pm-10:36 pm

1 stop8h 32m

Ontario

Mon 3/9

6:37 pm-7:19 am

1 stop9h 42m

$345

BaltimoreOntario

BWI - ONT

BWIONT

Baltimore/Washington

Wed 2/25

7:15 am-12:02 pm

1 stop7h 47m

Ontario

Tue 3/3

10:20 pm-9:22 am

1 stop8h 02m

$345

BaltimoreOntario

BWI - ONT

BWIONT

Baltimore/Washington

Sun 3/1

7:05 am-12:07 pm

1 stop8h 02m

Ontario

Thu 3/5

1:10 pm-11:44 pm

1 stop7h 34m

$345

BaltimoreOntario

BWI - ONT

BWIONT

Baltimore/Washington

Tue 2/24

7:15 am-12:02 pm

1 stop7h 47m

Ontario

Fri 2/27

5:00 pm-9:55 am

2 stops13h 55m

$350

BaltimoreOntario

BWI - ONT

BWIONT

Baltimore/Washington

Mon 2/23

4:45 pm-11:49 pm

2 stops10h 04m

Ontario

Sat 2/28

10:20 pm-9:22 am

1 stop8h 02m

$350

BaltimoreOntario

BWI - ONT

BWIONT

Baltimore/Washington

Tue 2/24

10:25 am-4:55 pm

2 stops9h 30m

Ontario

Tue 3/3

5:15 am-4:25 pm

2 stops8h 10m

$355

BaltimoreOntario

BWI - ONT

BWIONT

Baltimore/Washington

Wed 2/11

6:00 am-1:56 pm

2 stops10h 56m

Ontario

Tue 2/17

10:20 pm-1:54 pm

2 stops12h 34m

$356

BaltimoreOntario

BWI - ONT

BWIONT

Baltimore/Washington

Wed 4/22

7:04 am-2:32 pm

1 stop10h 28m

Ontario

Wed 4/29

3:26 pm-5:44 am

1 stop11h 18m

$368

BaltimoreOntario

BWI - ONT

BWIONT

Baltimore/Washington

Thu 3/5

11:20 am-2:05 pm

Nonstop5h 45m

Ontario

Wed 3/11

6:00 am-4:45 pm

1 stop7h 45m

$383

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/25

Showing 1-10 of 22 results
1
2
3

Compare providers for flights from Baltimore to Ontario

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Baltimore to Ontario in January.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
PricelinePrice Accuracy1 starTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Baltimore-Ontario flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Baltimore-Ontario flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Baltimore-Ontario flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Baltimore-Ontario flights, Cheapflights users trust Expedia the most. Expedia has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Baltimore-Ontario flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Baltimore to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario from Baltimore with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Baltimore to Ontario

How far ahead should I book a flight from Baltimore to Ontario?

Use this chart to determine the optimal time to book a round-trip flight from Baltimore to Ontario. Price data was last updated on January 23, 2026.

The price you pay for your flight from Baltimore to Ontario may vary depending on when you book. For the best chance of a lower fare, look to book 42 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

What is the cheapest month to book a flight from Baltimore to Ontario?

Currently, November is the cheapest month in which you can book a flight from Baltimore to Ontario (average of $77). Flying from Baltimore to Ontario in March is currently the most expensive (average of $182). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from BWI to ONT?

Find hourly flight availability from Baltimore to Ontario. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated January 26, 2026.

It’s typically best to fly out from Baltimore to Ontario in the morning. Doing so could potentially save you 36% on the flight price compared to flying at noon, which is usually more expensive.

Reviews of airlines servicing Ontario

Get insights into the airlines that provide service to Ontario. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Ontario. Reviews last updated January 26, 2026.
See what other customers who have flown with Southwest, Delta, and United Airlines from Baltimore to Ontario have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,268 reviews

Boarding

8.1

Food

7.0

Entertainment

7.5

Overall

8.0

Comfort

8.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Southwest
8.0
Very good
4,268 reviews
Southwest
8.0
Very good
4,268 reviews

Boarding

8.1

Food

7.0

Entertainment

7.5

Overall

8.0

Comfort

8.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Delta
7.9
Good
8,111 reviews
Southwest
8.0
Very good
4,268 reviews

Boarding

8.1

Food

7.0

Entertainment

7.5

Overall

8.0

Comfort

8.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
United Airlines
7.4
Good
9,199 reviews
Southwest
8.0
Very good
4,268 reviews

Boarding

8.1

Food

7.0

Entertainment

7.5

Overall

8.0

Comfort

8.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
American Airlines
7.2
Good
11,189 reviews
Southwest
8.0
Very good
4,268 reviews

Boarding

8.1

Food

7.0

Entertainment

7.5

Overall

8.0

Comfort

8.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Frontier
5.7
Fair
3,058 reviews
Southwest
8.0
Very good
4,268 reviews

Boarding

8.1

Food

7.0

Entertainment

7.5

Overall

8.0

Comfort

8.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.

Related info for your journey

Find useful and relevant information for your journey from Baltimore to Ontario. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How popular is this Baltimore to Ontario flight route?

    Flights from Baltimore/Washington to Ontario have been viewed 1 times in the past calendar month.

  • How long is the flight from Baltimore to Ontario?

    Airlines like Delta and United Airlines fly from Baltimore to Ontario in about 8h 32m. The time it takes to get you to your destination can typically vary by up to 2h 22m. The distance from Baltimore to Ontario is about 2276 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What are the cheapest airlines flying from Baltimore to Ontario round-trip?

    Cheapflights users have booked flights from Baltimore to Ontario round-trip from $195. Other airlines that can offer you cheap pricing are Delta, from $302, and American Airlines, from $336. Frontier is priced at 54% lower than the current average price of a flight leaving 3 months from now.

  • What are the cheapest airlines to fly from Baltimore to Ontario one-way?

    To fly one-way, consider booking your trip with Frontier, which is currently one of the cheapest options available, starting at $78. United Airlines flights start at $129 while deals on Delta start at $163 one-way.

  • What are the cheapest flights from Baltimore to Ontario?

    While on average a flight from Baltimore to Ontario is generally $240, our data shows the cheapest flight currently is $153. When looking at the most popular route, (Baltimore/Washington - Ontario), you can expect to pay $245 for that flight.

  • Can I find deals for flights from Baltimore to Ontario that include hotel bookings?

    Yes. In addition to deals on Baltimore to Ontario flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Baltimore to Ontario?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Baltimore to Ontario.

  • Can I find deals for business class flights from Baltimore to Ontario?

    Yes. Cheapflights offers flight deals from Baltimore to Ontario by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Baltimore to Ontario?

    Currently, November is the cheapest month in which you can book a flight from Baltimore to Ontario (average of $77). Flying from Baltimore to Ontario in March is currently the most expensive (average of $182). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

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Top 5 airlines flying from Baltimore to Ontario

Discover the top 5 airlines that operate flights from Baltimore to Ontario. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated January 26, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$195Average$265FlexibilityNo cancel feeOn-time62%
DeltaCheapest$302Average$586FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$336Average$497FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$344Average$411FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$346Average$452FlexibilityNo cancel feeOn-time63%

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