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Cheap flights from Ontario to Washington, D.C. from $71

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Ontario to Washington, D.C. departing on 2/5. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Cheap round-trip flights

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Multiple Airlines Logo
2:05 pm - 9:17 amONT-BWI
16h 12m1 stop
Multiple Airlines Logo
11:14 am - 4:33 pmBWI-ONT
32h 19m1 stop
$167Multiple Airlines
Find Deal
Fri, Dec 12 - Sun, Dec 14
Multiple Airlines Logo
2:05 pm - 9:17 amONT-BWI
16h 12m1 stop
Multiple Airlines Logo
8:39 pm - 11:27 amBWI-ONT
17h 48m1 stop
$175Multiple Airlines
Find Deal
Fri, Dec 5 - Mon, Dec 8
Frontier Logo
8:00 am - 5:47 pmONT-BWI
30h 47m2 stops
Frontier Logo
10:00 pm - 6:03 pmBWI-ONT
23h 03m1 stop
$208Frontier
Find Deal
Wed, Jan 7 - Sun, Jan 11
Frontier Logo
8:24 am - 6:40 pmONT-BWI
7h 16m1 stop
Frontier Logo
9:59 pm - 6:57 amBWI-ONT
11h 58m1 stop
$264Frontier
Find Deal
Fri, Nov 14 - Sun, Nov 16
American Airlines Logo
10:34 pm - 10:14 amONT-BWI
8h 40m1 stop
American Airlines Logo
2:46 pm - 7:39 pmBWI-ONT
7h 53m1 stop
$279American Airlines
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Thu, Dec 4 - Wed, Dec 10
American Airlines Logo
7:10 am - 10:59 pmONT-BWI
12h 49m1 stop
American Airlines Logo
1:00 pm - 7:57 pmBWI-ONT
9h 57m1 stop
$290American Airlines
Find Deal
Sat, Feb 14 - Tue, Feb 17
Delta Logo
6:00 am - 7:19 pmONT-BWI
10h 19m2 stops
Delta Logo
7:15 am - 11:59 amBWI-ONT
7h 44m1 stop
$316Delta
Find Deal
Sat, Feb 14 - Tue, Feb 17
Delta Logo
12:12 pm - 10:08 pmONT-BWI
6h 56m1 stop
Delta Logo
6:21 pm - 11:04 pmBWI-ONT
7h 43m1 stop
$317Delta
Find Deal
Thu, Dec 4 - Fri, Dec 5
United Airlines Logo
6:41 pm - 7:19 amONT-BWI
9h 38m1 stop
United Airlines Logo
3:56 pm - 9:49 pmBWI-ONT
8h 53m1 stop
$331United Airlines
Find Deal
Tue, Dec 2 - Wed, Dec 10
United Airlines Logo
5:05 am - 5:25 pmONT-BWI
9h 20m2 stops
United Airlines Logo
1:10 pm - 10:49 pmBWI-ONT
12h 39m2 stops
$335United Airlines
Find Deal
Tue, Dec 2 - Tue, Dec 9

Frontier flights from Ontario to Baltimore

Our best Frontier deals on Ontario to Baltimore flight tickets
Frontier
Jan 7
ONT8:00 amOntario
30h 47m
2 stops
BWI5:47 pmBaltimore/Washington
Jan 11
BWI10:00 pmBaltimore/Washington
23h 03m
1 stop
ONT6:03 pmOntario
$208
Find similar
Frontier
Nov 10
ONT8:24 amOntario
8h 17m
1 stop
BWI7:41 pmBaltimore/Washington
Nov 13
BWI9:58 pmBaltimore/Washington
12h 31m
1 stop
ONT7:29 amOntario
$252
Find similar
Frontier
Nov 14
ONT8:24 amOntario
7h 16m
1 stop
BWI6:40 pmBaltimore/Washington
Nov 16
BWI9:59 pmBaltimore/Washington
11h 58m
1 stop
ONT6:57 amOntario
$264
Find similar

American Airlines flights from Ontario to Baltimore

Our best American Airlines deals on Ontario to Baltimore flight tickets
American Airlines
Dec 4
ONT10:34 pmOntario
8h 40m
1 stop
BWI10:14 amBaltimore/Washington
Dec 10
BWI2:46 pmBaltimore/Washington
7h 53m
1 stop
ONT7:39 pmOntario
$279
Find similar
American Airlines
Feb 14
ONT7:10 amOntario
12h 49m
1 stop
BWI10:59 pmBaltimore/Washington
Feb 17
BWI1:00 pmBaltimore/Washington
9h 57m
1 stop
ONT7:57 pmOntario
$290
Find similar
American Airlines
Dec 2
ONT10:34 pmOntario
8h 40m
1 stop
BWI10:14 amBaltimore/Washington
Dec 9
BWI2:46 pmBaltimore/Washington
7h 53m
1 stop
ONT7:39 pmOntario
$295
Find similar

momondo 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, momondo users made 832,500 searches. Data last updated November 4, 2025.
Use the filters below to find and compare flights from Ontario to Baltimore that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Fri 12/12

2:05 pm-9:17 am

1 stop16h 12m

Baltimore/Washington

Sun 12/14

11:14 am-4:33 pm

1 stop32h 19m

$167

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Fri 12/5

2:05 pm-9:17 am

1 stop16h 12m

Baltimore/Washington

Mon 12/8

8:39 pm-11:27 am

1 stop17h 48m

$175

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Wed 1/7

8:00 am-5:47 pm

2 stops30h 47m

Baltimore/Washington

Sun 1/11

10:00 pm-6:03 pm

1 stop23h 03m

$208

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Fri 11/14

8:24 am-6:40 pm

1 stop7h 16m

Baltimore/Washington

Sun 11/16

9:59 pm-6:57 am

1 stop11h 58m

$264

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Thu 12/4

10:34 pm-10:14 am

1 stop8h 40m

Baltimore/Washington

Wed 12/10

2:46 pm-7:39 pm

1 stop7h 53m

$279

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Sat 2/14

7:10 am-10:59 pm

1 stop12h 49m

Baltimore/Washington

Tue 2/17

1:00 pm-7:57 pm

1 stop9h 57m

$290

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Sat 2/14

6:00 am-7:19 pm

2 stops10h 19m

Baltimore/Washington

Tue 2/17

7:15 am-11:59 am

1 stop7h 44m

$316

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Thu 12/4

12:12 pm-10:08 pm

1 stop6h 56m

Baltimore/Washington

Fri 12/5

6:21 pm-11:04 pm

1 stop7h 43m

$317

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Tue 12/2

6:41 pm-7:19 am

1 stop9h 38m

Baltimore/Washington

Wed 12/10

3:56 pm-9:49 pm

1 stop8h 53m

$331

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Tue 12/2

5:05 am-5:25 pm

2 stops9h 20m

Baltimore/Washington

Tue 12/9

1:10 pm-10:49 pm

2 stops12h 39m

$335

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Washington, D.C. from

How to get the cheapest flight ticket from Ontario to Baltimore

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to Baltimore?

If you’re not able to fly to Baltimore in May, then September is your next best option. Flight prices from Ontario to Baltimore during September average around $408.

What is the cheapest day to depart on your flight to Baltimore?

The cheapest day to depart from Ontario to Baltimore is on a Friday. Travelers who choose to depart for Baltimore on a Friday will often find tickets for as low as $296. If your travel schedule is flexible, try to avoid departing on a Sunday because tickets tend to average around $403. These prices are subject to change though, so be sure to set up a Price Alert for flights to Baltimore.

What is the cheapest time of day to depart on your flight to Baltimore?

Flying to Baltimore from Ontario in the evening is the least expensive time of day to depart. momondo users have found prices as low as $326 when looking at flights departing in the evening. Flights in the afternoon are often more expensive with an average ticket price of $469.

What is the cheapest Ontario to Baltimore/Washington flight route?

Fly from Ontario to Baltimore/Washington for the best Ontario - Baltimore/Washington flight prices

How far in advance should I book a flight to Baltimore?

You are more likely to see cheaper flights to Baltimore from Ontario when booking weeks ahead of your departure date. In general, you can expect to find flights to Baltimore for around $457 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Baltimore from Ontario for as low as $324 on momondo.

What cabin class options are available on Ontario to Baltimore/Washington flights?

There is only 1 cabin class available to choose from on Ontario to Baltimore/Washington flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on Ontario to Baltimore flights?

You could potentially save up to 31% on your flight if you consider stops on a Ontario to Baltimore flight.

How have Ontario to Baltimore flight prices changed over time?

As of November 2025, prices for Ontario to Baltimore flights are approximately 148% more expensive when compared to flights at the same time last year.

When to book flights from Ontario to Baltimore

Are you open to changing your travel dates? Check out the ideal times to fly from Ontario to Baltimore according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Ontario to Baltimore (ONT to BWI) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Ontario to Baltimore

Best Price Found

$197

Fastest flight time

4h 40m

Direct flights

Mon, Tue, Wed, Thu, Sat and Sun

Airports in Baltimore

1 airport
The best one-way flight to Baltimore from Ontario in the past 72 hours is $197. The best round-trip flight deal from Ontario to Baltimore found on momondo in the last 72 hours is $456.
The fastest flight from Ontario to Baltimore takes 4h 40m
Direct flights go from Ontario to Baltimore on Monday, Tuesday, Wednesday, Thursday, Saturday and Sunday. There are no airlines offering direct flights.
There is 1 airport near Baltimore: Baltimore/Washington (BWI)
Search flight deals

  • How far is Ontario to Baltimore/Washington by plane?

    The straight-line distance from Ontario to Baltimore/Washington is 2281.3 mi. In terms of flight time, this usually takes a little over 6h 56m.

  • When did momondo last update prices for flights from Ontario Airport to Baltimore/Washington Airport?

    Prices for flights from Ontario Airport to Baltimore/Washington Airport are refreshed on a daily basis.

  • How many operators does momondo search for flights from Ontario Airport to Baltimore/Washington Airport?

  • How old do you have to be to fly from Ontario Airport to Baltimore/Washington Airport?

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Ontario Airport to Baltimore/Washington Airport.

  • What documentation or ID do you need to fly to Baltimore/Washington Airport?

    The required travel and health documents for your Baltimore/Washington Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Baltimore/Washington Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

  • What is the most popular plane model from Ontario to Baltimore?

  • What is the most popular airline from Ontario to Baltimore?

Best airlines flying from Ontario to Baltimore

Compare and see reviews for airlines that fly from Ontario to Baltimore with momondo
Airline
Rating
Free Cancellation
Price
Spirit AirlinesPriceFrom $98Free CancellationRating
6.3
8,113 reviews
Search Spirit Airlines flights
FrontierPriceFrom $175Free CancellationRating
5.8
3,116 reviews
Search Frontier flights
United AirlinesPriceFrom $256Free CancellationRating
7.4
8,998 reviews
Search United Airlines flights
DeltaPriceFrom $326Free CancellationRating
7.9
8,002 reviews
Search Delta flights
SouthwestPriceFrom $337Free CancellationRating
8.0
4,237 reviews
Search Southwest flights
American AirlinesPriceFrom $346Free CancellationRating
7.2
11,038 reviews
Search American Airlines flights

Why use momondo?

Why should I use momondo to find a flight deal from Ontario to Baltimore?

Finding the right flight to Baltimore from Ontario is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to Baltimore quick and easy, saving you time and money.

Can I find flights from Ontario to Baltimore with flexible booking policies on momondo?

momondo does allow users to show only those flights to Baltimore from Ontario which offer a flexible booking policy as well as other useful filters and features.

How can momondo help me find flights from Ontario to Baltimore?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Ontario to Baltimore.

I’m not ready to book a flight from Ontario to Baltimore right now. Can momondo alert me if prices change?

Yes. momondo can track prices for Ontario to Baltimore flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

An easier way to manage your Baltimore trip

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