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$102+ 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 4/29. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BWI
Mar 30 — Apr 61
Sun 3/30
Sun 4/6
1 adult, Economy
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Cheapflights Tip: The best prices from Ontario to Baltimore/Washington are usually found in August or September, booked 47 days in advance, depart on a Monday or Thursday and return on a Wednesday

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 March 25, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$272
(Hawaiian Airlines)

One-way from

$102
(American Airlines)

Popular in

June

Cheapest in

August

Average price

$468
Provider with most accurate pricing for Ontario-Baltimore/Washington flight deals.
Search Deals
Provider most trusted by Cheapflights users for Ontario-Baltimore/Washington flights.
Search Deals
From Ontario to Baltimore/Washington
Search Deals
One-way flight from Ontario to Baltimore/Washington
Search Deals
Highest demand for flights based on searches. 13% potential increase in price ($68 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($14 potential savings vs. average RT price).
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Average for round-trip flights in March 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 March 25, 2025.

This Hawaiian Airlines deal was found by Cheapflights users on 3/24. 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 Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/14:29 pmONT - BWI
1 stop10h 17mHawaiian Airlines
Tue 5/67:06 amBWI - ONT
1 stop11h 26mHawaiian Airlines
Deal found 3/24$272
This Alaska Airlines deal was found by Cheapflights users on 3/24. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/16:24 pmONT - BWI
1 stop8h 22mAlaska Airlines
Tue 5/67:06 amBWI - ONT
1 stop11h 26mAlaska Airlines
Deal found 3/24$273
This Delta deal was found by Cheapflights users on 3/24. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/2610:15 pmONT - BWI
1 stop7h 57mDelta
Sat 5/32:04 pmBWI - ONT
1 stop8h 24mDelta
Deal found 3/24$276
This Frontier deal was found by Cheapflights users on 3/24. 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.
Tue 4/112:59 amONT - BWI
1 stop12h 29mFrontier
Thu 4/312:05 pmBWI - ONT
1 stop8h 08mFrontier
Deal found 3/24$278
This American Airlines deal was found by Cheapflights users on 3/24. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/86:00 amONT - BWI
1 stop9h 15mAmerican Airlines
Mon 4/147:08 pmBWI - ONT
1 stop7h 42mAmerican Airlines
Deal found 3/24$301
This United Airlines deal was found by Cheapflights users on 3/24. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/25:05 amONT - BWI
2 stops9h 09mUnited Airlines
Wed 5/76:45 amBWI - ONT
2 stops10h 40mUnited Airlines
Deal found 3/24$322
This Southwest deal was found by Cheapflights users on 3/24. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/246:15 pmONT - BWI
1 stop8h 35mSouthwest
Sun 6/86:25 pmBWI - ONT
Nonstop5h 20mSouthwest
Deal found 3/24$332
This Expedia deal was found by Cheapflights users on 3/24. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/256:00 amONT - BWI
1 stop9h 03mMultiple Airlines
Mon 3/3112:30 pmBWI - ONT
1 stop14h 39mMultiple Airlines
Deal found 3/24$464

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 March 25, 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

Thu 5/1

4:29 pm-5:46 am

1 stop10h 17m

Baltimore/Washington

Tue 5/6

7:06 am-3:32 pm

1 stop11h 26m

$272

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Thu 5/1

6:24 pm-5:46 am

1 stop8h 22m

Baltimore/Washington

Tue 5/6

7:06 am-3:32 pm

1 stop11h 26m

$273

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Sat 4/26

10:15 pm-9:12 am

1 stop7h 57m

Baltimore/Washington

Sat 5/3

2:04 pm-7:28 pm

1 stop8h 24m

$276

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Sun 4/6

12:59 am-11:27 am

1 stop7h 28m

Baltimore/Washington

Wed 4/9

8:49 pm-7:29 am

1 stop13h 40m

$278

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Tue 4/8

6:00 am-6:15 pm

1 stop9h 15m

Baltimore/Washington

Mon 4/14

7:08 pm-11:50 pm

1 stop7h 42m

$301

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Fri 5/2

5:05 am-5:14 pm

2 stops9h 09m

Baltimore/Washington

Wed 5/7

6:45 am-2:25 pm

2 stops10h 40m

$322

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Sat 5/24

6:15 pm-5:50 am

1 stop8h 35m

Baltimore/Washington

Sun 6/8

6:25 pm-8:45 pm

Nonstop5h 20m

$332

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Thu 8/14

12:59 am-4:26 pm

1 stop12h 27m

Baltimore/Washington

Sun 8/24

7:51 am-2:06 pm

1 stop9h 15m

$470

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Tue 4/29

10:40 pm-9:39 am

1 stop7h 59m

$102

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Thu 4/24

1:35 pm-11:30 pm

1 stop6h 55m

$117

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/24

Showing 1-10 of 16 results
1
2

Compare providers for flights from Ontario to Baltimore

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 Ontario to Baltimore in March.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust 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 Ontario-Baltimore flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Ontario-Baltimore flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Ontario-Baltimore flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Ontario-Baltimore flights, Cheapflights users trust FlightHub the most. FlightHub 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 Ontario-Baltimore 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 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 March 21, 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 March 25, 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 15% 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 March 23, 2025.

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

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 March 25, 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
9,785 reviews

Crew

8.5

Boarding

8.2

Comfort

7.9

Food

7.1

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Alaska Airlines
8.0
Very good
9,785 reviews
Alaska Airlines
8.0
Very good
9,785 reviews

Crew

8.5

Boarding

8.2

Comfort

7.9

Food

7.1

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Southwest
8.0
Very good
4,272 reviews
Alaska Airlines
8.0
Very good
9,785 reviews

Crew

8.5

Boarding

8.2

Comfort

7.9

Food

7.1

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Delta
8.0
Very good
7,890 reviews
Alaska Airlines
8.0
Very good
9,785 reviews

Crew

8.5

Boarding

8.2

Comfort

7.9

Food

7.1

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Hawaiian Airlines
7.9
Good
2,330 reviews
Alaska Airlines
8.0
Very good
9,785 reviews

Crew

8.5

Boarding

8.2

Comfort

7.9

Food

7.1

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
United Airlines
7.4
Good
8,605 reviews
Alaska Airlines
8.0
Very good
9,785 reviews

Crew

8.5

Boarding

8.2

Comfort

7.9

Food

7.1

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them

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

    Our cheapest airline available from Ontario to Baltimore is Hawaiian Airlines. Our recent data shows that you can find tickets from as low as $272 on this airline. Additional options worth looking into are Alaska Airlines and Delta, starting at $273 and $276 round-trip. These flights start at 38% lower than the current average price 3 months from now.

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

    $102 is the cheapest one-way deal found within the past few days, from American Airlines. You may also be able to find cheap deals on United Airlines and Hawaiian Airlines, with prices starting from $117 and $121, 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 $308, our data indicates the cheapest price to be $188. The most popular route (Ontario - Baltimore/Washington), is priced around $233.

  • 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.

See more FAQs

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Alternative routes for Ontario to Baltimore

See prices for flight routes from nearby airports that may be better suited for you.
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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 March 25, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$130Average$234FlexibilityNo cancel feeOn-time65%
FrontierCheapest$148Average$268FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$256Average$538FlexibilityNo cancel feeOn-time69%
DeltaCheapest$296Average$465FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$321Average$460FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$374Average$571FlexibilityNo cancel feeOn-time71%
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