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Ontario

$95+ 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 12/4. Fares are subject to change and may not be available on all flights or dates of travel.
BWI — ONT
oct. 11 — oct. 181
sáb. 10/11
sáb. 10/18
1 adult, Economy
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Cheapflights Tip: The best prices from Baltimore/Washington to Ontario are usually found in August or October, booked 46 days in advance, depart on a Tuesday or Thursday and return on a Thursday

Cheap 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 septiembre 11, 2025.

Round-trip from

$164
(Gotogate)

One-way from

$95
(Kiwi.com)

Popular in

December

Cheapest in

August

Average price

$418
From Baltimore/Washington to Ontario
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One-way flight from Baltimore/Washington to Ontario
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Highest demand for flights based on searches. 7% potential increase in price ($38 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($7 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Find 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 septiembre 11, 2025.

This Gotogate deal was found by Cheapflights users on 9/10. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 9/266:27 pmBWI - ONT
1 stop28h 27mFrontier
dom. 9/288:59 pmONT - BWI
1 stop17h 43mFrontier
Deal found 9/10$164
This Frontier deal was found by Cheapflights users on 9/10. 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.
vie. 10/249:42 pmBWI - ONT
1 stop13h 07mFrontier
lun. 10/276:53 amONT - BWI
1 stop7h 51mFrontier
Deal found 9/10$175
This Gotogate deal was found by Cheapflights users on 9/10. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 10/309:58 pmBWI - ONT
1 stop12h 31mFrontier
dom. 11/23:58 pmONT - BWI
1 stop15h 15mFrontier
Deal found 9/10$186
This Booking.com deal was found by Cheapflights users on 9/10. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 10/36:27 pmBWI - ONT
1 stop28h 27mFrontier
dom. 10/58:59 pmONT - BWI
1 stop17h 43mFrontier
Deal found 9/10$199
This Frontier deal was found by Cheapflights users on 9/11. 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.
jue. 10/309:58 pmBWI - ONT
1 stop12h 31mFrontier
lun. 11/38:24 amONT - BWI
1 stop7h 34mFrontier
Deal found 9/11$208
This Kiwi.com deal was found by Cheapflights users on 9/9. 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.
sáb. 10/187:50 amBWI - ONT
1 stop15h 52mMultiple Airlines
mié. 10/226:53 amONT - BWI
2 stops24h 37mMultiple Airlines
Deal found 9/9$211
This Kiwi.com deal was found by Cheapflights users on 9/9. 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.
sáb. 10/187:50 amBWI - ONT
1 stop15h 52mMultiple Airlines
sáb. 10/258:34 amONT - BWI
1 stop22h 44mMultiple Airlines
Deal found 9/9$212
This Kiwi.com deal was found by Cheapflights users on 9/9. 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.
sáb. 10/187:50 amBWI - ONT
1 stop15h 52mMultiple Airlines
lun. 10/2710:47 pmONT - BWI
1 stop15h 29mMultiple Airlines
Deal found 9/9$217
This Kiwi.com deal was found by Cheapflights users on 9/10. 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.
mié. 10/811:23 amBWI - ONT
2 stops12h 19mMultiple Airlines
mar. 10/148:00 amONT - BWI
1 stop17h 30mMultiple Airlines
Deal found 9/10$219

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 septiembre 11, 2025.
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

mié. 10/22

6:00 am-10:26 am

1 stop7h 26m

Ontario

mar. 10/28

11:36 am-10:15 pm

1 stop7h 39m

$277

BaltimoreOntario

BWI - ONT

BWIONT

Baltimore/Washington

mié. 10/1

6:48 am-10:42 am

1 stop6h 54m

Ontario

sáb. 10/4

7:05 am-5:19 pm

1 stop7h 14m

$277

BaltimoreOntario

BWI - ONT

BWIONT

Baltimore/Washington

mié. 10/22

4:44 pm-10:22 pm

1 stop8h 38m

Ontario

lun. 10/27

10:00 pm-9:13 am

1 stop8h 13m

$293

BaltimoreOntario

BWI - ONT

BWIONT

Baltimore/Washington

mar. 9/30

6:48 am-10:42 am

1 stop6h 54m

Ontario

sáb. 10/4

7:05 am-5:19 pm

1 stop7h 14m

$306

BaltimoreOntario

BWI - ONT

BWIONT

Baltimore/Washington

mar. 9/30

7:15 am-12:17 pm

1 stop8h 02m

Ontario

mar. 9/30

10:00 pm-9:13 am

1 stop8h 13m

$335

BaltimoreOntario

BWI - ONT

BWIONT

Baltimore/Washington

lun. 11/24

2:40 pm-5:15 pm

Nonstop5h 35m

Ontario

mié. 12/17

12:45 pm-10:50 pm

1 stop7h 05m

$336

BaltimoreOntario

BWI - ONT

BWIONT

Baltimore/Washington

vie. 10/3

3:40 pm-8:05 pm

1 stop7h 25m

Ontario

sáb. 10/11

12:05 pm-7:55 pm

Nonstop4h 50m

$344

BaltimoreOntario

BWI - ONT

BWIONT

Baltimore/Washington

jue. 10/30

6:00 am-5:10 pm

2 stops14h 10m

Ontario

lun. 11/3

10:00 pm-11:34 am

2 stops10h 34m

$366

BaltimoreOntario

BWI - ONT

BWIONT

Baltimore/Washington

mié. 10/8

4:55 pm-10:45 pm

1 stop8h 50m

Ontario

dom. 10/12

1:35 pm-12:15 am

1 stop7h 40m

$370

BaltimoreOntario

BWI - ONT

BWIONT

Baltimore/Washington

mié. 10/22

6:00 am-10:26 am

1 stop7h 26m

Ontario

sáb. 10/25

9:50 am-6:00 am

1 stop17h 10m

$371

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/10

Showing 1-10 of 22 results
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2
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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 August 29, 2025.

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 45 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, August is the cheapest month in which you can book a flight from Baltimore to Ontario (average of $246). Flying from Baltimore to Ontario in March is currently the most expensive (average of $328). 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 septiembre 11, 2025.

It’s typically best to fly out from Baltimore to Ontario in the morning. Doing so could potentially save you 22% on the flight price compared to flying in the afternoon, which is usually more expensive.

What is the cheapest day to fly from Baltimore to Ontario?

Use this chart to determine the cheapest time to fly round-trip from Baltimore to Ontario. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Baltimore to Ontario flight should consider departing on Saturday at noon when fares are most often at their lowest. Thursday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

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 septiembre 11, 2025.
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
4,248 reviews

Entertainment

7.5

Food

7.0

Boarding

8.1

Comfort

8.0

Overall

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
4,248 reviews
Southwest
8.0
Very good
4,248 reviews

Entertainment

7.5

Food

7.0

Boarding

8.1

Comfort

8.0

Overall

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
8.0
Very good
7,960 reviews
Southwest
8.0
Very good
4,248 reviews

Entertainment

7.5

Food

7.0

Boarding

8.1

Comfort

8.0

Overall

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
8,937 reviews
Southwest
8.0
Very good
4,248 reviews

Entertainment

7.5

Food

7.0

Boarding

8.1

Comfort

8.0

Overall

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
10,000 reviews
Southwest
8.0
Very good
4,248 reviews

Entertainment

7.5

Food

7.0

Boarding

8.1

Comfort

8.0

Overall

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
5.8
Fair
3,177 reviews
Southwest
8.0
Very good
4,248 reviews

Entertainment

7.5

Food

7.0

Boarding

8.1

Comfort

8.0

Overall

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 fly from Baltimore to Ontario in about 7h 26m. The time it takes to get you to your destination can typically vary by up to . The distance from Baltimore to Ontario is about 2276 mi.

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

    Cheapflights users have booked flights from Baltimore to Ontario round-trip from $188. Other airlines that can offer you cheap pricing are United Airlines, from $218, and Southwest, from $326. Frontier is priced at 57% lower than the current average price of a flight leaving 3 months from now.

  • What are the cheapest flights from Baltimore to Ontario?

    While on average a flight from Baltimore to Ontario is generally $436, our data shows the cheapest flight currently is $160. When looking at the most popular route, (Baltimore/Washington - Ontario), you can expect to pay $164 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, August is the cheapest month in which you can book a flight from Baltimore to Ontario (average of $246). Flying from Baltimore to Ontario in March is currently the most expensive (average of $328). 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.

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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 septiembre 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$188Average$248FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$218Average$502FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$326Average$460FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$336Average$497FlexibilityNo cancel feeOn-time71%
DeltaCheapest$346Average$470FlexibilityNo cancel feeOn-timeN/A

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