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$105+ 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 5/29. Fares are subject to change and may not be available on all flights or dates of travel.
BWI — ONT
May 6 — May 131
Tue 5/6
Tue 5/13
1 adult, Economy
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Cheapflights Tip: The best prices from Baltimore/Washington to Ontario are usually found in September or August, booked 31 days in advance, depart on a Tuesday or Monday and return on a Tuesday

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 May 1, 2025.

Most accurate provider

Mytrip
3 stars

Most trusted provider

Mytrip
3 stars

Round-trip from

$208
(Frontier)

One-way from

$105
(Trip.com)

Popular in

June

Cheapest in

September

Average price

$398
Provider with most accurate pricing for Baltimore/Washington-Ontario flight deals.
Search Deals
Provider most trusted by Cheapflights users for Baltimore/Washington-Ontario flights.
Search Deals
From Baltimore/Washington to Ontario
Search Deals
One-way flight from Baltimore/Washington to Ontario
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. 2% potential price decrease ($10 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in May 2025
Search Deals

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 May 1, 2025.

This CheapOair deal was found by Cheapflights users on 4/28. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/285:23 pmBWI - ONT
1 stop18h 52mFrontier
Fri 5/3012:59 amONT - BWI
1 stop12h 54mFrontier
Deal found 4/28$201
This Expedia deal was found by Cheapflights users on 4/30. 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.
Mon 6/25:20 pmBWI - ONT
1 stop9h 30mMultiple Airlines
Sat 6/74:45 pmONT - BWI
1 stop10h 44mMultiple Airlines
Deal found 4/30$318
This American Airlines deal was found by Cheapflights users on 4/30. 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 5/217:18 pmBWI - ONT
1 stop7h 25mAmerican Airlines
Wed 5/2810:40 pmONT - BWI
1 stop8h 16mAmerican Airlines
Deal found 4/30$319
This Alaska Airlines deal was found by Cheapflights users on 4/29. 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 6/37:49 amBWI - ONT
1 stop11h 01mAlaska Airlines
Tue 6/104:45 pmONT - BWI
1 stop10h 44mAlaska Airlines
Deal found 4/29$336
This Southwest deal was found by Cheapflights users on 4/29. 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 6/78:55 pmBWI - ONT
Nonstop5h 20mSouthwest
Mon 6/99:20 pmONT - BWI
Nonstop4h 50mSouthwest
Deal found 4/29$337
This Delta deal was found by Cheapflights users on 4/29. 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 5/317:00 amBWI - ONT
1 stop7h 08mDelta
Mon 8/410:05 pmONT - BWI
1 stop8h 18mDelta
Deal found 4/29$357
This United Airlines deal was found by Cheapflights users on 4/29. 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.
Mon 6/26:51 amBWI - ONT
1 stop8h 23mUnited Airlines
Wed 6/116:41 pmONT - BWI
2 stops12h 32mUnited Airlines
Deal found 4/29$370

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 May 1, 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

Wed 5/28

5:23 pm-9:15 am

1 stop18h 52m

Ontario

Fri 5/30

12:59 am-4:53 pm

1 stop12h 54m

$201

BaltimoreOntario

BWI - ONT

BWIONT

Baltimore/Washington

Mon 6/2

5:20 pm-11:50 pm

1 stop9h 30m

Ontario

Sat 6/7

4:45 pm-6:29 am

1 stop10h 44m

$318

BaltimoreOntario

BWI - ONT

BWIONT

Baltimore/Washington

Wed 5/21

7:18 pm-11:43 pm

1 stop7h 25m

Ontario

Wed 5/28

10:40 pm-9:56 am

1 stop8h 16m

$319

BaltimoreOntario

BWI - ONT

BWIONT

Baltimore/Washington

Tue 6/3

7:49 am-3:50 pm

1 stop11h 01m

Ontario

Tue 6/10

4:45 pm-6:29 am

1 stop10h 44m

$336

BaltimoreOntario

BWI - ONT

BWIONT

Baltimore/Washington

Sat 6/7

8:55 pm-11:15 pm

Nonstop5h 20m

Ontario

Mon 6/9

9:20 pm-5:10 am

Nonstop4h 50m

$337

BaltimoreOntario

BWI - ONT

BWIONT

Baltimore/Washington

Wed 5/21

7:00 am-11:08 am

1 stop7h 08m

Ontario

Wed 5/28

7:05 pm-8:51 am

2 stops10h 46m

$340

BaltimoreOntario

BWI - ONT

BWIONT

Baltimore/Washington

Mon 6/2

6:51 am-12:14 pm

1 stop8h 23m

Ontario

Wed 6/11

6:41 pm-10:13 am

2 stops12h 32m

$370

BaltimoreOntario

BWI - ONT

BWIONT

Baltimore/Washington

Thu 5/29

7:17 am-8:49 pm

1 stop16h 32m

$105

BaltimoreOntario

BWI - ONT

BWIONT

Baltimore/Washington

Wed 6/4

5:20 pm-9:12 am

1 stop18h 52m

$106

BaltimoreOntario

BWI - ONT

BWIONT

Baltimore/Washington

Tue 8/26

7:00 am-2:09 pm

1 stop10h 09m

$138

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/29

Showing 1-10 of 15 results
1
2

Compare providers for flights from Baltimore to Ontario

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 Baltimore to Ontario in May.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*2 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
PricelinePrice Accuracy2 starsTrust Score*3 stars
MytripPrice 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 Baltimore-Ontario flights, users find the pricing of Mytrip to be most consistent on Cheapflights vs. Mytrip Users can find the same prices on Baltimore-Ontario flight deals on Cheapflights vs. Mytrip >95% of the time. Price accuracy is based on data collected from Baltimore-Ontario flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Baltimore-Ontario flights, Cheapflights users trust Mytrip the most. Mytrip 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 Baltimore-Ontario 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 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 April 25, 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 31 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 May 1, 2025.

When flying from Baltimore to Ontario, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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. Sunday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

Rainfall in Ontario by month

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

In terms of precipitation, rainfall in Ontario ranges from 0.1 - 3.4 inches per month. February is typically the wettest month, when rainfall can reach 3.4 in. June is typically the driest time to visit Ontario when rainfall is around 0.1 in.

Temperature in Ontario by month

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

If weather is an important factor for your trip to Ontario, use this chart to help with planning. For those seeking warmer temperatures, August is the ideal time of year to visit, when temperatures reach an average of 78.8 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 53.6 F).

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 May 1, 2025.
See what other customers who have flown with Alaska Airlines, Southwest and Delta from Baltimore to Ontario 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
9,968 reviews

Entertainment

7.1

Food

7.1

Crew

8.5

Comfort

7.9

Overall

8.0

Boarding

8.2

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
9,968 reviews
Alaska Airlines
8.0
Very good
9,968 reviews

Entertainment

7.1

Food

7.1

Crew

8.5

Comfort

7.9

Overall

8.0

Boarding

8.2

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
4,294 reviews
Alaska Airlines
8.0
Very good
9,968 reviews

Entertainment

7.1

Food

7.1

Crew

8.5

Comfort

7.9

Overall

8.0

Boarding

8.2

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
7,934 reviews
Alaska Airlines
8.0
Very good
9,968 reviews

Entertainment

7.1

Food

7.1

Crew

8.5

Comfort

7.9

Overall

8.0

Boarding

8.2

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
2,408 reviews
Alaska Airlines
8.0
Very good
9,968 reviews

Entertainment

7.1

Food

7.1

Crew

8.5

Comfort

7.9

Overall

8.0

Boarding

8.2

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
8,696 reviews
Alaska Airlines
8.0
Very good
9,968 reviews

Entertainment

7.1

Food

7.1

Crew

8.5

Comfort

7.9

Overall

8.0

Boarding

8.2

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 Baltimore to Ontario. 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 Baltimore to Ontario round-trip?

    Cheapflights users have booked flights from Baltimore to Ontario round-trip from $208. Other airlines that can offer you cheap pricing are American Airlines, from $319, and Delta, from $340. Frontier is priced at 52% lower than the current average price of a flight leaving 3 months from now.

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

    To fly one-way, consider booking your trip with Frontier, which is currently one of the cheapest options available, starting at $106. Alaska Airlines flights start at $138 while deals on Delta start at $162 one-way.

  • What are the cheapest flights from Baltimore to Ontario?

    While on average a flight from Baltimore to Ontario is generally $513, our data shows the cheapest flight currently is $414. When looking at the most popular route, (Baltimore/Washington - Ontario), you can expect to pay $221 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.

See more FAQs

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Alternative routes for Baltimore to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
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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 May 1, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$180Average$252FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$222Average$515FlexibilityNo cancel feeOn-time69%
DeltaCheapest$306Average$458FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$321Average$550FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$336Average$471FlexibilityNo cancel feeOn-time63%

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