Ontario

$128+ 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 8/29. Fares are subject to change and may not be available on all flights or dates of travel.
BWI — ONT
ago. 3 — ago. 101
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Cheapflights Tip: The best prices from Baltimore/Washington to Ontario are usually found in September or August, booked 69 days in advance, depart on a Wednesday or Tuesday 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 julio 29, 2025.

Round-trip from

$258
(Frontier)

One-way from

$128
(Cheapflightsfares)

Popular in

December

Cheapest in

September

Average price

$464
From Baltimore/Washington to Ontario
One-way flight from Baltimore/Washington to Ontario
Highest demand for flights based on searches. 9% potential increase in price ($47 potential increase over avg. RT price).
Cheapest flight prices on average. 1% potential price decrease ($8 potential savings vs. average RT price).
Average for round-trip flights in July 2025

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 julio 29, 2025.

This Frontier deal was found by Cheapflights users on 7/27. 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.
sáb. 8/95:26 pmBWI - ONT
1 stop9h 24mFrontier
mar. 8/1212:59 amONT - BWI
1 stop12h 32mFrontier
Deal found 7/27$258
This Southwest deal was found by Cheapflights users on 7/28. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 8/271:25 pmBWI - ONT
1 stop9h 10mSouthwest
mié. 9/310:55 amONT - BWI
Nonstop4h 55mSouthwest
Deal found 7/28$322
This Delta deal was found by Cheapflights users on 7/29. 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.
sáb. 8/301:35 pmBWI - ONT
1 stop8h 36mDelta
sáb. 9/67:05 amONT - BWI
1 stop7h 15mDelta
Deal found 7/29$325
This Alaska Airlines deal was found by Cheapflights users on 7/29. 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.
mié. 11/57:38 amBWI - ONT
1 stop10h 39mAlaska Airlines
sáb. 11/86:00 amONT - BWI
1 stop9h 16mAlaska Airlines
Deal found 7/29$326
This American Airlines deal was found by Cheapflights users on 7/28. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 8/261:12 pmBWI - ONT
2 stops12h 36mAmerican Airlines
sáb. 8/306:17 amONT - BWI
2 stops11h 48mAmerican Airlines
Deal found 7/28$337
This United Airlines deal was found by Cheapflights users on 7/27. 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.
sáb. 8/2310:10 amBWI - ONT
2 stops13h 23mUnited Airlines
mié. 8/276:04 amONT - BWI
1 stop7h 13mUnited Airlines
Deal found 7/27$342

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 julio 29, 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

sáb. 8/9

5:26 pm-11:50 pm

1 stop9h 24m

Ontario

mar. 8/12

12:59 am-4:31 pm

1 stop12h 32m

$258

BaltimoreOntario

BWI - ONT

BWIONT

Baltimore/Washington

mié. 8/27

2:20 pm-6:25 pm

1 stop7h 05m

Ontario

mié. 9/3

10:55 am-6:50 pm

Nonstop4h 55m

$322

BaltimoreOntario

BWI - ONT

BWIONT

Baltimore/Washington

mar. 8/26

7:00 am-2:09 pm

1 stop10h 09m

Ontario

mié. 9/3

3:06 pm-5:39 am

1 stop11h 33m

$326

BaltimoreOntario

BWI - ONT

BWIONT

Baltimore/Washington

sáb. 9/6

5:40 am-10:35 am

1 stop7h 55m

Ontario

sáb. 9/13

7:05 am-5:18 pm

1 stop7h 13m

$327

BaltimoreOntario

BWI - ONT

BWIONT

Baltimore/Washington

mar. 8/26

1:12 pm-10:48 pm

2 stops12h 36m

Ontario

sáb. 8/30

6:17 am-9:05 pm

2 stops11h 48m

$337

BaltimoreOntario

BWI - ONT

BWIONT

Baltimore/Washington

sáb. 8/23

10:10 am-8:33 pm

2 stops13h 23m

Ontario

mié. 8/27

6:04 am-4:17 pm

1 stop7h 13m

$342

BaltimoreOntario

BWI - ONT

BWIONT

Baltimore/Washington

mié. 9/17

7:00 am-2:12 pm

1 stop10h 12m

Ontario

vie. 9/19

3:06 pm-5:39 am

1 stop11h 33m

$419

BaltimoreOntario

BWI - ONT

BWIONT

Baltimore/Washington

vie. 8/29

6:27 pm-11:50 pm

1 stop8h 23m

$128

BaltimoreOntario

BWI - ONT

BWIONT

Baltimore/Washington

mié. 9/17

9:20 am-11:35 am

Nonstop5h 15m

$159

BaltimoreOntario

BWI - ONT

BWIONT

Baltimore/Washington

mié. 9/3

7:00 am-2:12 pm

1 stop10h 12m

$163

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/29

Showing 1-10 of 15 results
1
2

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 July 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 62 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 julio 29, 2025.

It’s typically best to fly out from Baltimore to Ontario in the morning. Doing so could potentially save you 23% on the flight price compared to flying at noon, which is usually more expensive.

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. 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 Baltimore to Ontario?

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 julio 29, 2025.
See what other customers who have flown with Alaska Airlines, Southwest, and Delta from Baltimore to Ontario have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.

Comfort

7.8

Crew

8.5

Boarding

8.1

Entertainment

7.1

Food

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

Comfort

7.8

Crew

8.5

Boarding

8.1

Entertainment

7.1

Food

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

Comfort

7.8

Crew

8.5

Boarding

8.1

Entertainment

7.1

Food

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
8.0
Very good

Comfort

7.8

Crew

8.5

Boarding

8.1

Entertainment

7.1

Food

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

Comfort

7.8

Crew

8.5

Boarding

8.1

Entertainment

7.1

Food

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

Comfort

7.8

Crew

8.5

Boarding

8.1

Entertainment

7.1

Food

7.1

Overall

8.0

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 airports do I use to fly from Baltimore to Ontario?

    You will need to book a flight from Baltimore/Washington to Ontario if you want to fly from Baltimore to Ontario. At least 5 different airlines have flights from Baltimore/Washington (BWI) to Ontario (ONT) on a regular basis. There is 1 flight to Ontario from the Baltimore airport per day. If you manage to book one that is nonstop, then you can expect the flight time from BWI to ONT to be around 5h 15m.

  • How popular is this Baltimore to Ontario flight route?

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

    Cheapflights users have booked flights from Baltimore to Ontario round-trip from $258. Other airlines that can offer you cheap pricing are Southwest, from $322, and Alaska Airlines, from $326. Frontier is priced at 40% 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 $128. Southwest flights start at $159 while deals on Alaska Airlines start at $163 one-way.

  • What are the cheapest flights from Baltimore to Ontario?

    While on average a flight from Baltimore to Ontario is generally $303, our data shows the cheapest flight currently is $102. When looking at the most popular route, (Baltimore/Washington - Ontario), you can expect to pay $281 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.

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 julio 29, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$175Average$248FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$310Average$531FlexibilityNo cancel feeOn-time69%
DeltaCheapest$326Average$470FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$326Average$462FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$336Average$497FlexibilityNo cancel feeOn-time71%

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