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$106+ 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 5/23. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BWI
May 17 — May 243
Sat 5/17
Sat 5/24
3 travelers, Economy
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Cheapflights Tip: The best prices from Ontario to Baltimore/Washington are usually found in August or May, 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 May 12, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

Expedia
3 stars

Round-trip from

$210
(Frontier)

One-way from

$106
(Frontier)

Popular in

October

Cheapest in

August

Average price

$361
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. 4% potential increase in price ($19 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($5 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in May 2025
Search Deals

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 May 12, 2025.

This Frontier deal was found by Cheapflights users on 5/10. 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.
Fri 5/2312:59 amONT - BWI
1 stop12h 54mFrontier
Mon 6/25:20 pmBWI - ONT
1 stop9h 30mFrontier
Deal found 5/10$230
This Trip.com deal was found by Cheapflights users on 5/11. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/196:00 amONT - BWI
1 stop20h 43mMultiple Airlines
Mon 6/236:00 amBWI - ONT
1 stop17h 51mMultiple Airlines
Deal found 5/11$258
This Delta deal was found by Cheapflights users on 5/12. 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 7/97:05 amONT - BWI
1 stop7h 14mDelta
Wed 7/165:40 amBWI - ONT
1 stop8h 00mDelta
Deal found 5/12$357
This American Airlines deal was found by Cheapflights users on 5/11. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/58:04 pmONT - BWI
2 stops11h 53mAmerican Airlines
Mon 9/82:10 pmBWI - ONT
2 stops10h 46mAmerican Airlines
Deal found 5/11$367
This Southwest deal was found by Cheapflights users on 5/11. 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.
Sat 8/29:20 pmONT - BWI
Nonstop4h 50mSouthwest
Mon 8/119:20 amBWI - ONT
Nonstop5h 15mSouthwest
Deal found 5/11$376
This Alaska Airlines deal was found by Cheapflights users on 5/11. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/104:45 pmONT - BWI
1 stop10h 44mAlaska Airlines
Tue 6/177:51 amBWI - ONT
1 stop9h 55mAlaska Airlines
Deal found 5/11$386
This United Airlines deal was found by Cheapflights users on 5/10. 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.
Wed 6/46:41 pmONT - BWI
2 stops12h 32mUnited Airlines
Sat 6/76:51 amBWI - ONT
1 stop8h 23mUnited Airlines
Deal found 5/10$387
This Hawaiian Airlines deal was found by Cheapflights users on 5/11. 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 Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/304:45 pmONT - BWI
1 stop10h 44mHawaiian Airlines
Tue 6/37:49 amBWI - ONT
1 stop11h 01mHawaiian Airlines
Deal found 5/11$501

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 May 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

Fri 5/23

12:59 am-4:53 pm

1 stop12h 54m

Baltimore/Washington

Mon 6/2

5:20 pm-11:50 pm

1 stop9h 30m

$210

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Thu 6/19

6:00 am-5:43 am

1 stop20h 43m

Baltimore/Washington

Mon 6/23

6:00 am-8:51 pm

1 stop17h 51m

$258

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Thu 6/26

9:20 pm-5:10 am

Nonstop4h 50m

Baltimore/Washington

Sat 7/5

8:55 pm-11:15 pm

Nonstop5h 20m

$337

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Wed 7/9

7:05 am-5:19 pm

1 stop7h 14m

Baltimore/Washington

Wed 7/16

5:40 am-10:40 am

1 stop8h 00m

$357

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Wed 7/9

6:15 am-8:34 pm

2 stops11h 19m

Baltimore/Washington

Mon 7/14

10:35 am-6:08 pm

2 stops10h 33m

$367

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Tue 6/10

4:45 pm-6:29 am

1 stop10h 44m

Baltimore/Washington

Tue 6/17

7:51 am-2:46 pm

1 stop9h 55m

$386

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Wed 6/4

6:41 pm-10:13 am

2 stops12h 32m

Baltimore/Washington

Sat 6/7

6:51 am-12:14 pm

1 stop8h 23m

$387

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Fri 5/30

4:45 pm-6:29 am

1 stop10h 44m

Baltimore/Washington

Tue 6/3

7:49 am-3:50 pm

1 stop11h 01m

$501

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Fri 5/23

12:59 am-4:53 pm

1 stop12h 54m

$106

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Sat 6/14

7:00 am-5:43 am

1 stop19h 43m

$111

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/11

Showing 1-10 of 15 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 May.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*2 stars
CheapflightsfaresPrice Accuracy3 starsTrust Score*2 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 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 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 May 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 May 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 May 11, 2025.

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

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 May 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

Comfort

7.9

Entertainment

7.1

Overall

8.0

Crew

8.5

Food

7.1

Boarding

8.1

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

Comfort

7.9

Entertainment

7.1

Overall

8.0

Crew

8.5

Food

7.1

Boarding

8.1

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
4,290 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.9

Entertainment

7.1

Overall

8.0

Crew

8.5

Food

7.1

Boarding

8.1

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
7,950 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.9

Entertainment

7.1

Overall

8.0

Crew

8.5

Food

7.1

Boarding

8.1

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
2,432 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.9

Entertainment

7.1

Overall

8.0

Crew

8.5

Food

7.1

Boarding

8.1

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
8,724 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.9

Entertainment

7.1

Overall

8.0

Crew

8.5

Food

7.1

Boarding

8.1

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.

  • 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 Frontier. Our recent data shows that you can find tickets from as low as $210 on this airline. Additional options worth looking into are Southwest and Delta, starting at $337 and $357 round-trip. These flights start at 50% lower than the current average price 3 months from now.

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

    $106 is the cheapest one-way deal found within the past few days, from Frontier. You may also be able to find cheap deals on Southwest and Alaska Airlines, with prices starting from $169 and $178, 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 $317, our data indicates the cheapest price to be $123. The most popular route (Ontario - Baltimore/Washington), is priced around $271.

  • 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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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 May 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$121Average$183FlexibilityNo cancel feeOn-time65%
FrontierCheapest$148Average$235FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$256Average$466FlexibilityNo cancel feeOn-time69%
DeltaCheapest$296Average$453FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$296Average$586FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$332Average$443FlexibilityNo cancel feeOn-time63%

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