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Cheap flights from Ontario to Washington, D.C. from $135

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 9/13. 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

Frontier Logo
5:21 pm - 4:31 pmONT-BWI
20h 10m1 stop
Frontier Logo
5:26 pm - 11:50 pmBWI-ONT
9h 24m1 stop
$268Frontier
Find Deal
jue., ago. 14 - sáb., ago. 16
Frontier Logo
8:59 pm - 5:42 pmONT-BWI
17h 43m1 stop
Frontier Logo
6:27 pm - 7:54 pmBWI-ONT
28h 27m1 stop
$274Frontier
Find Deal
sáb., sep. 6 - lun., sep. 8
Southwest Logo
12:05 pm - 7:55 pmONT-BWI
4h 50mnonstop
Southwest Logo
8:25 pm - 10:50 pmBWI-ONT
5h 25mnonstop
$317Southwest
Find Deal
sáb., oct. 4 - lun., oct. 6
Southwest Logo
12:45 pm - 8:35 pmONT-BWI
4h 50mnonstop
Southwest Logo
3:55 pm - 6:15 pmBWI-ONT
5h 20mnonstop
$321Southwest
Find Deal
jue., sep. 4 - sáb., sep. 6
Delta Logo
11:45 am - 12:23 amONT-BWI
9h 38m1 stop
Delta Logo
5:40 am - 10:35 amBWI-ONT
7h 55m1 stop
$327Delta
Find Deal
jue., ago. 28 - jue., sep. 4
United Airlines Logo
6:38 pm - 5:21 amONT-BWI
7h 43m1 stop
United Airlines Logo
6:15 am - 12:32 pmBWI-ONT
9h 17m2 stops
$332United Airlines
Find Deal
jue., ago. 28 - jue., sep. 4
American Airlines Logo
6:10 am - 11:03 pmONT-BWI
13h 53m2 stops
American Airlines Logo
2:49 pm - 10:33 pmBWI-ONT
10h 44m2 stops
$337American Airlines
Find Deal
mié., sep. 3 - mar., sep. 9
Delta Logo
1:15 pm - 11:56 pmONT-BWI
7h 41m1 stop
Delta Logo
7:15 am - 12:14 pmBWI-ONT
7h 59m1 stop
$339Delta
Find Deal
vie., ago. 29 - lun., sep. 1
United Airlines Logo
1:42 pm - 5:21 amONT-BWI
12h 39m2 stops
United Airlines Logo
8:30 am - 12:32 pmBWI-ONT
7h 02m1 stop
$344United Airlines
Find Deal
vie., ago. 22 - lun., ago. 25
American Airlines Logo
11:59 pm - 12:48 pmONT-BWI
9h 49m1 stop
American Airlines Logo
8:15 am - 3:32 pmBWI-ONT
10h 17m1 stop
$351American Airlines
Find Deal
vie., ago. 29 - dom., ago. 31

Southwest flights from Ontario to Baltimore

Our best Southwest deals on Ontario to Baltimore flight tickets
Southwest
Oct 4
ONT12:05 pmOntario
4h 50m
BWI7:55 pmBaltimore/Washington
Oct 6
BWI8:25 pmBaltimore/Washington
5h 25m
ONT10:50 pmOntario
$317
Find similar
Southwest
Sep 4
ONT12:45 pmOntario
4h 50m
BWI8:35 pmBaltimore/Washington
Sep 6
BWI3:55 pmBaltimore/Washington
5h 20m
ONT6:15 pmOntario
$321
Find similar
Southwest
Oct 4
ONT3:50 pmOntario
10h 10m
1 stop
BWI5:00 amBaltimore/Washington
Oct 6
BWI8:25 pmBaltimore/Washington
5h 25m
ONT10:50 pmOntario
$322
Find similar

Frontier flights from Ontario to Baltimore

Our best Frontier deals on Ontario to Baltimore flight tickets
Frontier
Aug 8
ONT12:59 amOntario
12h 32m
1 stop
BWI4:31 pmBaltimore/Washington
Aug 16
BWI5:26 pmBaltimore/Washington
9h 24m
1 stop
ONT11:50 pmOntario
$258
Find similar
Frontier
Aug 14
ONT5:21 pmOntario
20h 10m
1 stop
BWI4:31 pmBaltimore/Washington
Aug 16
BWI5:26 pmBaltimore/Washington
9h 24m
1 stop
ONT11:50 pmOntario
$268
Find similar
Frontier
Sep 6
ONT8:59 pmOntario
17h 43m
1 stop
BWI5:42 pmBaltimore/Washington
Sep 8
BWI6:27 pmBaltimore/Washington
28h 27m
1 stop
ONT7:54 pmOntario
$274
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 agosto 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

jue. 8/14

5:21 pm-4:31 pm

1 stop20h 10m

Baltimore/Washington

sáb. 8/16

5:26 pm-11:50 pm

1 stop9h 24m

$268

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

sáb. 9/6

8:59 pm-5:42 pm

1 stop17h 43m

Baltimore/Washington

lun. 9/8

6:27 pm-7:54 pm

1 stop28h 27m

$274

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

sáb. 10/4

12:05 pm-7:55 pm

Nonstop4h 50m

Baltimore/Washington

lun. 10/6

8:25 pm-10:50 pm

Nonstop5h 25m

$317

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

jue. 9/4

12:45 pm-8:35 pm

Nonstop4h 50m

Baltimore/Washington

sáb. 9/6

3:55 pm-6:15 pm

Nonstop5h 20m

$321

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

jue. 8/28

11:45 am-12:23 am

1 stop9h 38m

Baltimore/Washington

jue. 9/4

5:40 am-10:35 am

1 stop7h 55m

$327

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

jue. 8/28

6:38 pm-5:21 am

1 stop7h 43m

Baltimore/Washington

jue. 9/4

6:15 am-12:32 pm

2 stops9h 17m

$332

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

mié. 9/3

6:10 am-11:03 pm

2 stops13h 53m

Baltimore/Washington

mar. 9/9

2:49 pm-10:33 pm

2 stops10h 44m

$337

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

vie. 8/29

1:15 pm-11:56 pm

1 stop7h 41m

Baltimore/Washington

lun. 9/1

7:15 am-12:14 pm

1 stop7h 59m

$339

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

vie. 8/22

1:42 pm-5:21 am

2 stops12h 39m

Baltimore/Washington

lun. 8/25

8:30 am-12:32 pm

1 stop7h 02m

$344

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

vie. 8/29

11:59 pm-12:48 pm

1 stop9h 49m

Baltimore/Washington

dom. 8/31

8:15 am-3:32 pm

1 stop10h 17m

$351

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 $396.

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 $302. If your travel schedule is flexible, try to avoid departing on a Sunday because tickets tend to average around $410. 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 at noon is the least expensive time of day to depart. momondo users have found prices as low as $202 when looking at flights departing at noon. Flights in the afternoon are often more expensive with an average ticket price of $438.

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 $445 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 $319 on momondo.

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

There are 1 cabin classes 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 August 2025, prices for Ontario to Baltimore flights are approximately 30% 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

$135

Fastest flight time

4h 45m

Direct flights

Every day

Airports in Baltimore

1 airport
The best one-way flight to Baltimore from Ontario in the past 72 hours is $135. The best round-trip flight deal from Ontario to Baltimore found on momondo in the last 72 hours is $268.
The fastest flight from Ontario to Baltimore takes 4h 45m
Direct flights go from Ontario to Baltimore every day.
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 4h 50m.

  • 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
8,053 reviews
Search Spirit Airlines flights
FrontierPriceFrom $148Free CancellationRating
5.8
3,232 reviews
Search Frontier flights
DeltaPriceFrom $296Free CancellationRating
8.0
7,987 reviews
Search Delta flights
United AirlinesPriceFrom $321Free CancellationRating
7.4
8,912 reviews
Search United Airlines flights
SouthwestPriceFrom $330Free CancellationRating
8.0
4,246 reviews
Search Southwest flights
American AirlinesPriceFrom $346Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights

  • Southwest Flights From Ontario to Baltimore

    Southwest flies from Ontario to Baltimore around 4 times per week, with 4,246 momondo users rating the airline 8.0/10. The cheapest Southwest deal from Ontario to Baltimore in the last 72 hours was $330 (round-trip), much lower than the average airfare cost of $457 for Southwest flights on this route.

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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