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$101+ 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 8/4. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BWI
jul. 8 — jul. 151
mar. 7/8
mar. 7/15
1 adult, Economy
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Cheapflights Tip: The best prices from Ontario to Baltimore/Washington are usually found in May or September, 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 julio 3, 2025.

Round-trip from

$199
(FlightHub)

One-way from

$101
(FlightHub)

Popular in

June

Cheapest in

May

Average price

$472
From Ontario to Baltimore/Washington
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One-way flight from Ontario to Baltimore/Washington
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Highest demand for flights based on searches. 1% potential increase in price ($8 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($7 potential savings vs. average RT price).
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Average for round-trip flights in July 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 julio 3, 2025.

This FlightHub deal was found by Cheapflights users on 6/30. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 8/510:06 amONT - BWI
1 stop30h 05mFrontier
vie. 8/222:17 pmBWI - ONT
1 stop23h 07mFrontier
Deal found 6/30$199
This Southwest deal was found by Cheapflights users on 7/2. 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.
jue. 9/1812:45 pmONT - BWI
Nonstop4h 50mSouthwest
lun. 9/229:20 amBWI - ONT
Nonstop5h 15mSouthwest
Deal found 7/2$297
This Alaska Airlines deal was found by Cheapflights users on 7/1. 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.
jue. 9/43:06 pmONT - BWI
1 stop11h 33mAlaska Airlines
mar. 9/97:00 amBWI - ONT
1 stop10h 12mAlaska Airlines
Deal found 7/1$306
This Delta deal was found by Cheapflights users on 7/2. 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.
mar. 8/57:05 amONT - BWI
1 stop7h 14mDelta
lun. 8/114:39 pmBWI - ONT
1 stop8h 41mDelta
Deal found 7/2$307
This American Airlines deal was found by Cheapflights users on 7/2. 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.
jue. 9/187:16 pmONT - BWI
2 stops12h 37mAmerican Airlines
lun. 9/222:46 pmBWI - ONT
1 stop9h 38mAmerican Airlines
Deal found 7/2$312

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 julio 3, 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

mar. 8/5

10:06 am-7:11 pm

1 stop30h 05m

Baltimore/Washington

vie. 8/22

2:17 pm-10:24 am

1 stop23h 07m

$199

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

jue. 9/18

12:45 pm-8:35 pm

Nonstop4h 50m

Baltimore/Washington

lun. 9/22

9:20 am-11:35 am

Nonstop5h 15m

$297

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

jue. 9/4

3:06 pm-5:39 am

1 stop11h 33m

Baltimore/Washington

mar. 9/9

7:00 am-2:12 pm

1 stop10h 12m

$306

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

mar. 8/5

7:05 am-5:19 pm

1 stop7h 14m

Baltimore/Washington

lun. 8/11

4:39 pm-10:20 pm

1 stop8h 41m

$307

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

jue. 9/18

7:16 pm-10:53 am

2 stops12h 37m

Baltimore/Washington

lun. 9/22

2:46 pm-9:24 pm

1 stop9h 38m

$312

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

lun. 8/4

8:09 pm-7:11 pm

1 stop20h 02m

$101

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

lun. 10/27

6:11 pm-6:18 am

1 stop9h 07m

$143

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

lun. 10/27

12:50 pm-8:35 pm

Nonstop4h 45m

$149

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

mar. 11/4

6:00 am-6:13 pm

1 stop9h 13m

$151

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

lun. 8/4

5:09 pm-5:46 am

1 stop9h 37m

$154

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/1

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 June 27, 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 julio 3, 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 June 29, 2025.

Travelers seeking maximum savings on their Ontario to Baltimore flight should consider departing on Wednesday afternoons 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.

Weekly flight availability from Ontario to Baltimore

Explore weekly flight availability from Ontario to Baltimore. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated julio 3, 2025.

The most flights from ONT to BWI are scheduled on a Monday (1 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (1 on average).

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 julio 3, 2025.
Read reviews from past customers who have flown Alaska Airlines, Southwest, and Delta 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.
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Crew

8.5

Food

7.1

Comfort

7.8

Boarding

8.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Crew

8.5

Food

7.1

Comfort

7.8

Boarding

8.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Southwest
8.0
Very good
4,266 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Crew

8.5

Food

7.1

Comfort

7.8

Boarding

8.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Delta
8.0
Very good
7,982 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Crew

8.5

Food

7.1

Comfort

7.8

Boarding

8.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Crew

8.5

Food

7.1

Comfort

7.8

Boarding

8.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Frontier
5.9
Fair
3,286 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Crew

8.5

Food

7.1

Comfort

7.8

Boarding

8.1

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 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 airports do I use to fly from Ontario to Baltimore?

    To fly from Ontario to Baltimore, you need to book a flight from Ontario (ONT) to Baltimore/Washington (BWI). Nonstop flights to Baltimore/Washington from Ontario take 4h 45m on average. When it comes time to book airfare, you have a few options: there is 1 outbound flight from Ontario to Baltimore/Washington offered by 6 different airlines.

  • How popular is this Ontario to Baltimore flight route?

    This flight path from Ontario to Baltimore/Washington was viewed by 4 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 $199 on this airline. Additional options worth looking into are Southwest and Alaska Airlines, starting at $297 and $306 round-trip. These flights start at 55% lower than the current average price 3 months from now.

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

    $101 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 $149 and $153, 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 $330, our data indicates the cheapest price to be $148. The most popular route (Ontario - Baltimore/Washington), is priced around $241.

  • 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.

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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 julio 3, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$130Average$209FlexibilityNo cancel feeOn-time65%
FrontierCheapest$148Average$220FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$256Average$462FlexibilityNo cancel feeOn-time69%
DeltaCheapest$296Average$445FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$311Average$576FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$331Average$454FlexibilityNo cancel feeOn-time63%

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