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$100+ 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 3/4. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BWI
Feb 7 — Feb 141
Sat 2/7
Sat 2/14
1 adult, Economy
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Find cheap flights from Ontario to Baltimore with Cheapflights

1. Tell us where you want to go

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Cheapflights Tip: The best prices from Ontario to Baltimore/Washington are usually found in May or April, booked 71 days in advance, depart on a Thursday or Monday and return on a Friday

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 January 8, 2026.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$201
(Kiwi.com)

One-way from

$100
(Kiwi.com)

Popular in

January

Cheapest in

May

Average price

$512
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. 8% potential increase in price ($39 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($7 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
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 January 8, 2026.

This Kiwi.com deal was found by Cheapflights users on 1/7. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 1/292:06 pmONT - BWI
1 stop17h 37mFrontier
Mon 2/26:00 amBWI - ONT
2 stops21h 20mFrontier
Deal found 1/7$201
This Kiwi.com deal was found by Cheapflights users on 1/6. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 1/292:06 pmONT - BWI
1 stop17h 37mFrontier
Wed 2/47:10 amBWI - ONT
2 stops34h 17mFrontier
Deal found 1/6$218
This Kiwi.com deal was found by Cheapflights users on 1/6. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/52:06 pmONT - BWI
1 stop17h 37mFrontier
Wed 2/116:00 amBWI - ONT
2 stops30h 34mFrontier
Deal found 1/6$223
This Kiwi.com deal was found by Cheapflights users on 1/8. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/98:05 pmONT - BWI
2 stops18h 08mFrontier
Fri 2/137:50 pmBWI - ONT
1 stop14h 36mFrontier
Deal found 1/8$224
This Kiwi.com deal was found by Cheapflights users on 1/7. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/33:07 pmONT - BWI
2 stops16h 24mMultiple Airlines
Sun 2/87:58 pmBWI - ONT
1 stop19h 45mMultiple Airlines
Deal found 1/7$235
This Mytrip deal was found by Cheapflights users on 1/6. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 1/168:32 amONT - BWI
1 stop8h 18mFrontier
Thu 1/227:58 pmBWI - ONT
1 stop19h 45mFrontier
Deal found 1/6$242
This Kiwi.com deal was found by Cheapflights users on 1/8. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/61:46 pmONT - BWI
1 stop17h 41mMultiple Airlines
Mon 2/96:00 amBWI - ONT
2 stops21h 20mMultiple Airlines
Deal found 1/8$246
This Kiwi.com deal was found by Cheapflights users on 1/7. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 1/222:06 pmONT - BWI
2 stops17h 20mMultiple Airlines
Sun 1/2511:43 amBWI - ONT
1 stop29h 44mMultiple Airlines
Deal found 1/7$252
This Frontier deal was found by Cheapflights users on 1/5. 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.
Thu 1/157:56 pmONT - BWI
1 stop12h 43mFrontier
Sun 1/1812:42 pmBWI - ONT
1 stop9h 19mFrontier
Deal found 1/5$256
This United Airlines deal was found by Cheapflights users on 1/6. 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 2/111:24 pmONT - BWI
1 stop6h 51mUnited Airlines
Wed 2/254:09 pmBWI - ONT
1 stop7h 41mUnited Airlines
Deal found 1/6$257

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 January 8, 2026.
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

Tue 4/28

10:15 pm-9:36 am

1 stop8h 21m

Baltimore/Washington

Tue 5/5

7:00 am-11:29 am

1 stop7h 29m

$257

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Wed 1/28

10:30 pm-9:24 am

1 stop7h 54m

Baltimore/Washington

Mon 2/2

7:00 am-12:16 pm

1 stop8h 16m

$287

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Tue 5/5

7:00 am-5:54 pm

1 stop7h 54m

Baltimore/Washington

Thu 5/14

7:00 am-11:20 am

1 stop7h 20m

$302

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Wed 3/11

12:50 pm-12:53 am

1 stop9h 03m

Baltimore/Washington

Sat 3/21

7:01 am-12:23 pm

1 stop8h 22m

$302

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Fri 3/20

12:50 pm-12:53 am

1 stop9h 03m

Baltimore/Washington

Tue 3/24

2:38 pm-9:04 pm

1 stop9h 26m

$302

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Wed 5/13

12:00 pm-12:15 am

1 stop9h 15m

Baltimore/Washington

Sat 5/16

12:15 pm-6:15 pm

1 stop9h 00m

$302

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Sun 2/8

10:30 pm-9:24 am

1 stop7h 54m

Baltimore/Washington

Wed 2/11

7:00 am-12:16 pm

1 stop8h 16m

$302

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Fri 2/6

7:30 am-11:44 pm

2 stops13h 14m

Baltimore/Washington

Mon 2/9

7:00 am-12:16 pm

1 stop8h 16m

$316

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Mon 2/2

10:30 pm-9:24 am

1 stop7h 54m

Baltimore/Washington

Mon 2/9

7:00 am-12:16 pm

1 stop8h 16m

$317

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Mon 1/26

10:30 pm-9:23 am

1 stop7h 53m

Baltimore/Washington

Sun 2/1

7:00 am-12:16 pm

1 stop8h 16m

$332

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/6

Showing 1-10 of 22 results
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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 January.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars
CheapflightsfaresPrice Accuracy3 starsTrust Score*2 stars
PricelinePrice Accuracy1 starTrust 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 eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Ontario-Baltimore flight deals on Cheapflights vs. eDreams >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 eDreams the most. eDreams 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 January 2, 2026.

The best time to book flights from Ontario to Baltimore is 70 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 $93). Flying from Ontario to Baltimore in December is currently the most expensive (average of $179). 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 January 8, 2026.

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

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 January 8, 2026.
Read reviews from past customers who have flown Southwest, Delta, and United Airlines from Ontario to Baltimore. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,250 reviews

Crew

8.6

Overall

8.0

Food

7.0

Boarding

8.1

Entertainment

7.5

Comfort

8.0

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.
Southwest
8.0
Very good
4,250 reviews
Southwest
8.0
Very good
4,250 reviews

Crew

8.6

Overall

8.0

Food

7.0

Boarding

8.1

Entertainment

7.5

Comfort

8.0

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.
Delta
7.9
Good
8,025 reviews
Southwest
8.0
Very good
4,250 reviews

Crew

8.6

Overall

8.0

Food

7.0

Boarding

8.1

Entertainment

7.5

Comfort

8.0

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.
United Airlines
7.4
Good
9,139 reviews
Southwest
8.0
Very good
4,250 reviews

Crew

8.6

Overall

8.0

Food

7.0

Boarding

8.1

Entertainment

7.5

Comfort

8.0

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.
American Airlines
7.2
Good
11,095 reviews
Southwest
8.0
Very good
4,250 reviews

Crew

8.6

Overall

8.0

Food

7.0

Boarding

8.1

Entertainment

7.5

Comfort

8.0

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.
Frontier
5.7
Fair
3,062 reviews
Southwest
8.0
Very good
4,250 reviews

Crew

8.6

Overall

8.0

Food

7.0

Boarding

8.1

Entertainment

7.5

Comfort

8.0

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.

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 7 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

  • How long is the flight from Ontario to Baltimore?

    Airlines like Delta fly from Ontario to Baltimore in about 8h 21m. The time it takes to get you to your destination can typically vary by up to . The distance from Ontario to Baltimore is about 2276 mi.

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

    Our cheapest airline available from Ontario to Baltimore is Spirit Airlines. Our recent data shows that you can find tickets from as low as $72 on this airline. Additional options worth looking into are Frontier and Delta, starting at $136 and $208 round-trip. These flights start at 83% lower than the current average price 3 months from now.

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

    $65 is the cheapest one-way deal found within the past few days, from Frontier. You may also be able to find cheap deals on Delta and Southwest, with prices starting from $144 and $163, 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 $583, our data indicates the cheapest price to be $218. The most popular route (Ontario - Baltimore/Washington), is priced around $207.

  • 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 $93). Flying from Ontario to Baltimore in December is currently the most expensive (average of $179). 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 January 8, 2026.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$98Average$224FlexibilityNo cancel feeOn-time65%
FrontierCheapest$175Average$240FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$276Average$441FlexibilityNo cancel feeOn-time69%
DeltaCheapest$276Average$427FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$337Average$469FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$346Average$508FlexibilityNo cancel feeOn-time71%

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