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$148+ 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 9/24. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BWI
Jun 17 — Jun 241
Tue 6/17
Tue 6/24
1 adult, Economy
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Cheapflights Tip: The best prices from Ontario to Baltimore/Washington are usually found in May or June, booked 47 days in advance, depart on a Tuesday or Thursday 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 June 12, 2025.

Round-trip from

$297
(Southwest)

One-way from

$148
(lastminute.com)

Popular in

February

Cheapest in

May

Average price

$411
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. 3% potential increase in price ($15 potential increase over avg. RT price).
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Cheapest flight prices on average. 0% potential price decrease ($4 potential savings vs. average RT price).
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Average for round-trip flights in June 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 June 12, 2025.

This Southwest deal was found by Cheapflights users on 6/11. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/49:20 pmONT - BWI
Nonstop4h 50mSouthwest
Mon 8/119:20 amBWI - ONT
Nonstop5h 15mSouthwest
Deal found 6/11$297
This Frontier deal was found by Cheapflights users on 6/11. 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.
Sun 8/312:59 amONT - BWI
1 stop12h 32mFrontier
Mon 8/115:26 pmBWI - ONT
1 stop9h 24mFrontier
Deal found 6/11$303
This American Airlines deal was found by Cheapflights users on 6/10. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/1312:47 pmONT - BWI
1 stop7h 15mAmerican Airlines
Wed 8/277:00 amBWI - ONT
1 stop7h 52mAmerican Airlines
Deal found 6/10$318
This United Airlines deal was found by Cheapflights users on 6/10. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/146:39 pmONT - BWI
2 stops12h 24mUnited Airlines
Mon 8/185:20 pmBWI - ONT
1 stop7h 46mUnited Airlines
Deal found 6/10$322
This Delta deal was found by Cheapflights users on 6/10. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/2412:00 pmONT - BWI
1 stop7h 37mDelta
Mon 9/296:10 pmBWI - ONT
1 stop7h 31mDelta
Deal found 6/10$351
This Alaska Airlines deal was found by Cheapflights users on 6/10. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/123:04 pmONT - BWI
1 stop11h 29mAlaska Airlines
Sun 9/147:22 pmBWI - ONT
1 stop18h 22mAlaska Airlines
Deal found 6/10$444

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 June 12, 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

Mon 8/4

9:20 pm-5:10 am

Nonstop4h 50m

Baltimore/Washington

Mon 8/11

9:20 am-11:35 am

Nonstop5h 15m

$297

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Sun 8/3

12:59 am-4:31 pm

1 stop12h 32m

Baltimore/Washington

Mon 8/11

5:26 pm-11:50 pm

1 stop9h 24m

$303

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Wed 8/13

12:47 pm-11:02 pm

1 stop7h 15m

Baltimore/Washington

Wed 8/27

7:00 am-11:52 am

1 stop7h 52m

$318

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Thu 8/14

6:39 pm-10:03 am

2 stops12h 24m

Baltimore/Washington

Mon 8/18

5:20 pm-10:06 pm

1 stop7h 46m

$322

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Wed 9/24

12:00 pm-10:37 pm

1 stop7h 37m

Baltimore/Washington

Mon 9/29

6:10 pm-10:41 pm

1 stop7h 31m

$351

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Fri 9/12

3:04 pm-5:33 am

1 stop11h 29m

Baltimore/Washington

Sun 9/14

7:22 pm-10:44 am

1 stop18h 22m

$444

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Wed 9/24

3:04 pm-5:33 am

1 stop11h 29m

$148

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Mon 9/22

12:45 pm-8:35 pm

Nonstop4h 50m

$149

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Mon 9/8

3:04 pm-5:33 am

1 stop11h 29m

$158

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Mon 8/4

11:59 pm-12:43 pm

1 stop9h 44m

$159

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/11

Showing 1-10 of 14 results
1
2

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 June 9, 2025.

The best time to book flights from Ontario to Baltimore is 47 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 June 12, 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 17% 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 June 8, 2025.

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

Weekly flight availability from Ontario to Baltimore

Explore weekly flight availability from Ontario to Baltimore. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated June 12, 2025.

The most flights from ONT to BWI are scheduled on a Monday (1 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (1 on average).

Rainfall in Baltimore by month

Plan your trip to Baltimore by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Baltimore ranges from 2.9 - 4.1 inches per month. July is typically the wettest month, when rainfall can reach 4.1 in. February is typically the driest time to visit Baltimore when rainfall is around 2.9 in.

Temperature in Baltimore by month

Plan your trip to Baltimore by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Baltimore, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 77.0 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 33.8 F).

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 June 12, 2025.
See what other customers who have flown with Alaska Airlines, Southwest and Delta from Ontario to Baltimore have to say. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Entertainment

7.1

Boarding

8.1

Overall

8.0

Comfort

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Entertainment

7.1

Boarding

8.1

Overall

8.0

Comfort

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Southwest
8.0
Very good
4,287 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Entertainment

7.1

Boarding

8.1

Overall

8.0

Comfort

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Delta
8.0
Very good
7,946 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Entertainment

7.1

Boarding

8.1

Overall

8.0

Comfort

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Hawaiian Airlines
7.9
Good
2,494 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Entertainment

7.1

Boarding

8.1

Overall

8.0

Comfort

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
United Airlines
7.4
Good
8,790 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Entertainment

7.1

Boarding

8.1

Overall

8.0

Comfort

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

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.

  • What airports do I use to fly from Ontario to Baltimore?

    To fly from Ontario to Baltimore, you need to book a flight from Ontario (ONT) to Baltimore/Washington (BWI). Nonstop flights to Baltimore/Washington from Ontario take 4h 45m on average. When it comes time to book airfare, you have a few options: there is 1 outbound flight from Ontario to Baltimore/Washington offered by 6 different airlines.

  • How popular is this Ontario to Baltimore flight route?

    This flight path from Ontario to Baltimore/Washington was viewed by 1 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

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

    Our cheapest airline available from Ontario to Baltimore is Southwest. Our recent data shows that you can find tickets from as low as $297 on this airline. Additional options worth looking into are Frontier and American Airlines, starting at $303 and $318 round-trip. These flights start at 31% lower than the current average price 3 months from now.

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

    $148 is the cheapest one-way deal found within the past few days, from Hawaiian Airlines. You may also be able to find cheap deals on Southwest and Alaska Airlines, with prices starting from $149 and $158, respectively.

  • What are the cheapest flights from Ontario to Baltimore?

    Looking for the cheapest flight from Ontario to Baltimore? While on average our users pay $307, our data indicates the cheapest price to be $153. The most popular route (Ontario - Baltimore/Washington), is priced around $297.

  • 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 June 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$130Average$191FlexibilityNo cancel feeOn-time65%
FrontierCheapest$148Average$234FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$256Average$449FlexibilityNo cancel feeOn-time69%
DeltaCheapest$296Average$452FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$296Average$574FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$330Average$452FlexibilityNo cancel feeOn-time63%

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