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Cheap flights from Ontario to Washington, D.C. from $80

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 3/3. 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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Find the cheapest flights from Ontario to Washington, D.C.

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
7:17 pm - 11:17 am
ONT
-
BWI
13h 00m
2 stops
Frontier Logo
10:57 am - 12:23 pm
BWI
-
ONT
28h 26m
1 stop
$237Frontier
Wed, Feb 11 - Thu, Feb 19
Frontier Logo
5:18 pm - 9:29 am
ONT
-
BWI
13h 11m
1 stop
Frontier Logo
3:06 pm - 8:39 pm
BWI
-
ONT
8h 33m
1 stop
$242Frontier
Wed, Apr 1 - Wed, Apr 15
Frontier Logo
1:18 pm - 5:13 pm
ONT
-
BWI
24h 55m
2 stops
Frontier Logo
6:31 pm - 3:05 pm
BWI
-
ONT
23h 34m
1 stop
$264Frontier
Mon, Mar 2 - Mon, Mar 9
Multiple Airlines Logo
3:24 pm - 5:44 am
ONT
-
BWI
11h 20m
1 stop
Multiple Airlines Logo
3:06 pm - 8:39 pm
BWI
-
ONT
8h 33m
1 stop
$270Multiple Airlines
Wed, May 6 - Tue, May 12
Multiple Airlines Logo
8:26 am - 11:12 am
ONT
-
BWI
23h 46m
1 stop
Multiple Airlines Logo
7:16 pm - 9:45 am
BWI
-
ONT
17h 29m
1 stop
$284Multiple Airlines
Thu, Apr 23 - Mon, Apr 27
Multiple Airlines Logo
7:09 pm - 5:36 pm
ONT
-
BWI
19h 27m
1 stop
Multiple Airlines Logo
6:41 pm - 11:59 pm
BWI
-
ONT
32h 18m
2 stops
$285Multiple Airlines
Sun, Mar 8 - Tue, Mar 10
Frontier Logo
5:18 pm - 9:24 am
ONT
-
BWI
13h 06m
1 stop
Frontier Logo
11:49 am - 6:45 pm
BWI
-
ONT
9h 56m
1 stop
$286Frontier
Wed, Apr 8 - Sat, Apr 11
Frontier Logo
5:18 pm - 9:24 am
ONT
-
BWI
13h 06m
1 stop
Frontier Logo
10:34 am - 6:45 pm
BWI
-
ONT
11h 11m
1 stop
$290Frontier
Wed, Apr 8 - Sun, Apr 12
Frontier Logo
5:18 pm - 9:29 am
ONT
-
BWI
13h 11m
1 stop
Frontier Logo
10:34 am - 6:45 pm
BWI
-
ONT
11h 11m
1 stop
$295Frontier
Wed, Apr 1 - Sun, Apr 5
Multiple Airlines Logo
1:18 pm - 10:27 am
ONT
-
BWI
18h 09m
1 stop
Multiple Airlines Logo
6:31 pm - 3:05 pm
BWI
-
ONT
23h 34m
1 stop
$306Multiple Airlines
Mon, Mar 2 - Mon, Mar 9

Alaska Airlines flights from Ontario to Baltimore

Our best Alaska Airlines deals on Ontario to Baltimore flight tickets
Alaska Airlines
May 6
ONT3:24 pmOntario
11h 20m
1 stop
BWI5:44 amBaltimore/Washington
May 13
BWI5:30 pmBaltimore/Washington
9h 26m
1 stop
ONT11:56 pmOntario
$321
Alaska Airlines
May 20
ONT4:03 pmOntario
11h 25m
1 stop
BWI6:28 amBaltimore/Washington
May 27
BWI7:48 amBaltimore/Washington
10h 21m
1 stop
ONT3:09 pmOntario
$361
Alaska Airlines
Apr 30
ONT3:26 pmOntario
11h 18m
1 stop
BWI5:44 amBaltimore/Washington
May 4
BWI7:04 amBaltimore/Washington
10h 28m
1 stop
ONT2:32 pmOntario
$365

Frontier flights from Ontario to Baltimore

Our best Frontier deals on Ontario to Baltimore flight tickets
Frontier
Feb 11
ONT7:17 pmOntario
13h 00m
2 stops
BWI11:17 amBaltimore/Washington
Feb 19
BWI10:57 amBaltimore/Washington
28h 26m
1 stop
ONT12:23 pmOntario
$237
Frontier
Apr 1
ONT5:18 pmOntario
13h 11m
1 stop
BWI9:29 amBaltimore/Washington
Apr 15
BWI3:06 pmBaltimore/Washington
8h 33m
1 stop
ONT8:39 pmOntario
$242
Frontier
Mar 2
ONT1:18 pmOntario
24h 55m
2 stops
BWI5:13 pmBaltimore/Washington
Mar 9
BWI6:31 pmBaltimore/Washington
23h 34m
1 stop
ONT3:05 pmOntario
$264

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 February 1, 2026.
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

Wed 2/11

7:17 pm-11:17 am

2 stops13h 00m

Baltimore/Washington

Thu 2/19

10:57 am-12:23 pm

1 stop28h 26m

$237

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Wed 4/1

5:18 pm-9:29 am

1 stop13h 11m

Baltimore/Washington

Wed 4/15

3:06 pm-8:39 pm

1 stop8h 33m

$242

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Mon 3/2

1:18 pm-5:13 pm

2 stops24h 55m

Baltimore/Washington

Mon 3/9

6:31 pm-3:05 pm

1 stop23h 34m

$264

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Wed 5/6

3:24 pm-5:44 am

1 stop11h 20m

Baltimore/Washington

Tue 5/12

3:06 pm-8:39 pm

1 stop8h 33m

$270

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Thu 4/23

8:26 am-11:12 am

1 stop23h 46m

Baltimore/Washington

Mon 4/27

7:16 pm-9:45 am

1 stop17h 29m

$284

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Sun 3/8

7:09 pm-5:36 pm

1 stop19h 27m

Baltimore/Washington

Tue 3/10

6:41 pm-11:59 pm

2 stops32h 18m

$285

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Wed 4/8

5:18 pm-9:24 am

1 stop13h 06m

Baltimore/Washington

Sat 4/11

11:49 am-6:45 pm

1 stop9h 56m

$286

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Wed 4/8

5:18 pm-9:24 am

1 stop13h 06m

Baltimore/Washington

Sun 4/12

10:34 am-6:45 pm

1 stop11h 11m

$290

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Wed 4/1

5:18 pm-9:29 am

1 stop13h 11m

Baltimore/Washington

Sun 4/5

10:34 am-6:45 pm

1 stop11h 11m

$295

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Mon 3/2

1:18 pm-10:27 am

1 stop18h 09m

Baltimore/Washington

Mon 3/9

6:31 pm-3:05 pm

1 stop23h 34m

$306

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 January, then May is your next best option. Flight prices from Ontario to Baltimore during May average around $397.

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 $291. If your travel schedule is flexible, try to avoid departing on a Sunday because tickets tend to average around $413. 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 afternoon is the least expensive time of day to depart. momondo users have found prices as low as $268 when looking at flights departing in the afternoon. Flights at noon are often more expensive with an average ticket price of $437.

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 $439 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 $228 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?

No. A direct flight is the cheapest option for a flight between Ontario to Baltimore.

How have Ontario to Baltimore flight prices changed over time?

As of February 2026, prices for Ontario to Baltimore flights are approximately 39% 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

$283

Fastest flight time

4h 40m

Direct flights

Every day

Airports in Baltimore

1 airport
The best one-way flight to Baltimore from Ontario in the past 72 hours is $283. The best round-trip flight deal from Ontario to Baltimore found on momondo in the last 72 hours is $408.
The fastest flight from Ontario to Baltimore takes 4h 40m
Direct flights go from Ontario to Baltimore every day.
There is 1 airport in Baltimore. From Ontario there are direct flights to 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 4h 40m.

  • 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 $72Free CancellationRating
6.3
8,396 reviews
Search Spirit Airlines flights
FrontierPriceFrom $136Free CancellationRating
5.7
3,054 reviews
Search Frontier flights
DeltaPriceFrom $183Free CancellationRating
7.9
8,130 reviews
Search Delta flights
United AirlinesPriceFrom $276Free CancellationRating
7.4
9,219 reviews
Search United Airlines flights
SouthwestPriceFrom $337Free CancellationRating
8.0
4,267 reviews
Search Southwest flights
American AirlinesPriceFrom $346Free CancellationRating
7.2
11,213 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.

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