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$92+ Cheap flights from Ontario to Baltimore (ONT - BWI)

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 10/18. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BWI
Oct 16 — Oct 231
Thu 10/16
Thu 10/23
1 adult, Economy
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Cheapflights Tip: The best prices from Ontario to Baltimore/Washington are usually found in May or April, booked 70 days in advance, depart on a Thursday or Tuesday and return on a Tuesday

Cheap flight deals from Ontario to Baltimore

Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to Baltimore (BWI). 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 September 16, 2025.

Round-trip from

$175
(Frontier)

One-way from

$92
(American Airlines)

Popular in

June

Cheapest in

May

Average price

$428
From Ontario to Baltimore/Washington
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One-way flight from Ontario to Baltimore/Washington
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Highest demand for flights based on searches. 1% potential increase in price ($7 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 Ontario to Baltimore

Cheapest flights from Ontario to Baltimore
Explore the most affordable flight options available from Ontario to Baltimore. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 16, 2025.

This Frontier deal was found by Cheapflights users on 9/16. 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.
Sun 10/266:53 amONT - BWI
1 stop7h 51mFrontier
Sun 11/29:59 pmBWI - ONT
1 stop12h 30mFrontier
Deal found 9/16$175
This Frontier deal was found by Cheapflights users on 9/16. 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.
Mon 11/38:24 amONT - BWI
1 stop7h 34mFrontier
Sun 11/99:59 pmBWI - ONT
1 stop12h 30mFrontier
Deal found 9/16$176
This United Airlines deal was found by Cheapflights users on 9/15. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/185:05 amONT - BWI
1 stop7h 08mUnited Airlines
Sat 10/254:21 pmBWI - ONT
1 stop7h 03mUnited Airlines
Deal found 9/15$185
This Booking.com deal was found by Cheapflights users on 9/16. 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.
Fri 11/77:23 pmONT - BWI
1 stop15h 47mFrontier
Sun 11/99:59 pmBWI - ONT
1 stop12h 30mFrontier
Deal found 9/16$188
This American Airlines deal was found by Cheapflights users on 9/14. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/2510:09 amONT - BWI
2 stops11h 24mAmerican Airlines
Tue 10/289:30 amBWI - ONT
2 stops12h 05mAmerican Airlines
Deal found 9/14$195
This Frontier deal was found by Cheapflights users on 9/16. 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 10/307:39 amONT - BWI
2 stops13h 28mFrontier
Sun 11/29:59 pmBWI - ONT
1 stop12h 30mFrontier
Deal found 9/16$203
This Booking.com deal was found by Cheapflights users on 9/14. 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.
Thu 10/2310:30 amONT - BWI
1 stop28h 14mFrontier
Sun 11/29:59 pmBWI - ONT
1 stop12h 30mFrontier
Deal found 9/14$205
This Booking.com deal was found by Cheapflights users on 9/16. 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.
Thu 10/2310:30 amONT - BWI
1 stop28h 14mFrontier
Sun 10/269:42 pmBWI - ONT
1 stop13h 07mFrontier
Deal found 9/16$209
This Booking.com deal was found by Cheapflights users on 9/15. 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.
Thu 10/23:43 pmONT - BWI
1 stop22h 59mFrontier
Sun 10/56:27 pmBWI - ONT
1 stop16h 26mFrontier
Deal found 9/15$217
This Frontier deal was found by Cheapflights users on 9/15. 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.
Mon 10/276:53 amONT - BWI
1 stop7h 51mFrontier
Sun 11/29:59 pmBWI - ONT
2 stops16h 11mFrontier
Deal found 9/15$219
This Frontier deal was found by Cheapflights users on 9/16. 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.
Wed 10/18:59 pmONT - BWI
2 stops17h 54mFrontier
Fri 10/109:42 pmBWI - ONT
1 stop13h 07mFrontier
Deal found 9/16$220
This Booking.com deal was found by Cheapflights users on 9/16. 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.
Fri 10/246:53 amONT - BWI
1 stop7h 51mFrontier
Thu 10/309:58 pmBWI - ONT
1 stop12h 31mFrontier
Deal found 9/16$225

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ontario to Baltimore 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 September 16, 2025.
Use the filters below to find and compare flights from Ontario to Baltimore that are best for you.

Fly from

Ontario

Fly to

Baltimore

Route

Depart

Return

Price

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Tue 11/18

6:00 am-7:21 pm

2 stops10h 21m

Baltimore/Washington

Mon 11/24

5:12 pm-10:31 pm

1 stop8h 19m

$250

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Mon 12/8

10:25 pm-11:12 am

1 stop9h 47m

Baltimore/Washington

Thu 12/11

7:15 am-12:22 pm

1 stop8h 07m

$277

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Sat 11/8

11:36 am-10:09 pm

1 stop7h 33m

Baltimore/Washington

Sat 11/15

6:00 am-10:40 am

1 stop7h 40m

$278

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Sat 10/25

9:50 am-11:02 pm

2 stops10h 12m

Baltimore/Washington

Tue 10/28

7:15 am-12:16 pm

1 stop8h 01m

$282

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Thu 12/4

6:00 am-4:15 pm

1 stop7h 15m

Baltimore/Washington

Sat 12/13

4:15 pm-8:42 pm

1 stop7h 27m

$283

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Sat 11/22

6:38 pm-5:40 am

1 stop8h 02m

Baltimore/Washington

Tue 11/25

8:15 am-12:33 pm

1 stop7h 18m

$285

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Wed 11/12

6:00 am-5:28 pm

1 stop8h 28m

Baltimore/Washington

Sat 11/15

10:55 am-8:44 pm

2 stops12h 49m

$288

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Thu 11/13

5:05 am-7:21 pm

1 stop11h 16m

Baltimore/Washington

Sat 11/15

8:15 am-12:33 pm

1 stop7h 18m

$350

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Tue 11/18

6:00 am-6:16 pm

1 stop9h 16m

Baltimore/Washington

Wed 12/3

7:00 am-3:21 pm

1 stop11h 21m

$362

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Mon 11/17

5:49 pm-10:48 am

2 stops13h 59m

Baltimore/Washington

Thu 11/20

6:00 am-5:09 pm

2 stops14h 09m

$365

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/14

Showing 1-10 of 22 results
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Best time to book a flight from Ontario to Baltimore

Have a flexible travel schedule? Discover the best time to fly to Baltimore from Ontario 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 Ontario to Baltimore

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

Use this chart to determine the optimal time to book a round-trip flight from Ontario to Baltimore. Price data was last updated on September 12, 2025.

The best time to book flights from Ontario to Baltimore is 70 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

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

Currently, August is the cheapest month in which you can book a flight from Ontario to Baltimore (average of $241). Flying from Ontario to Baltimore in March is currently the most expensive (average of $290). 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 ONT to BWI?

Find hourly flight availability from Ontario to Baltimore. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 16, 2025.

One of the essential ways to save on airfare from Ontario to Baltimore is to remain as flexible as possible. Flights that are in the afternoon tend to be the most expensive. A flight in the morning could potentially save you up to 25% on airfare.

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

Use this chart to determine the cheapest time to fly round-trip from Ontario to Baltimore. Price data was last updated on September 14, 2025.

Travelers seeking maximum savings on their Ontario to Baltimore flight should consider departing on Sunday mornings 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.

How much does it cost to fly round-trip from Ontario to Baltimore?

Reviews of airlines servicing Baltimore

Get insights into the airlines that provide service to Baltimore. 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 Baltimore. Reviews last updated September 16, 2025.
Read reviews from past customers who have flown Southwest, Delta, and United Airlines from Ontario to Baltimore. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,242 reviews

Comfort

8.0

Food

7.0

Crew

8.6

Boarding

8.1

Overall

8.0

Entertainment

7.5

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
4,242 reviews
Southwest
8.0
Very good
4,242 reviews

Comfort

8.0

Food

7.0

Crew

8.6

Boarding

8.1

Overall

8.0

Entertainment

7.5

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
7,957 reviews
Southwest
8.0
Very good
4,242 reviews

Comfort

8.0

Food

7.0

Crew

8.6

Boarding

8.1

Overall

8.0

Entertainment

7.5

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
8,924 reviews
Southwest
8.0
Very good
4,242 reviews

Comfort

8.0

Food

7.0

Crew

8.6

Boarding

8.1

Overall

8.0

Entertainment

7.5

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
4,242 reviews

Comfort

8.0

Food

7.0

Crew

8.6

Boarding

8.1

Overall

8.0

Entertainment

7.5

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
3,174 reviews
Southwest
8.0
Very good
4,242 reviews

Comfort

8.0

Food

7.0

Crew

8.6

Boarding

8.1

Overall

8.0

Entertainment

7.5

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 Ontario to Baltimore. 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 Ontario to Baltimore flight route?

    This flight path from Ontario to Baltimore/Washington was viewed by 5 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

  • How long is the flight from Ontario to Baltimore?

    Airlines like United Airlines and Delta fly from Ontario to Baltimore in about 9h 47m. The time it takes to get you to your destination can typically vary by up to 34m. The distance from Ontario to Baltimore 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 Ontario to Baltimore round-trip?

    Our cheapest airline available from Ontario to Baltimore is Spirit Airlines. Our recent data shows that you can find tickets from as low as $98 on this airline. Additional options worth looking into are Frontier and United Airlines, starting at $148 and $296 round-trip. These flights start at 78% lower than the current average price 3 months from now.

  • What are the cheapest flights from Ontario to Baltimore?

    Looking for the cheapest flight from Ontario to Baltimore? While on average our users pay $320, our data indicates the cheapest price to be $153. The most popular route (Ontario - Baltimore/Washington), is priced around $167.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Ontario to Baltimore 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 Ontario to Baltimore?

    Currently, August is the cheapest month in which you can book a flight from Ontario to Baltimore (average of $241). Flying from Ontario to Baltimore in March is currently the most expensive (average of $290). 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 6 airlines flying from Ontario to Baltimore

Discover the top 6 airlines that operate flights from Ontario to Baltimore. 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 September 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$98Average$212FlexibilityNo cancel feeOn-time65%
FrontierCheapest$148Average$218FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$296Average$472FlexibilityNo cancel feeOn-time69%
DeltaCheapest$326Average$450FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$339Average$462FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$346Average$547FlexibilityNo cancel feeOn-time71%

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