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Cheap flights from Ontario to Washington, D.C. from $114

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 8/27. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

Discover deals from 900+ travel sites with momondo.

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
8:11 pm - 11:40 amONT  Ontario-BWI Baltimore/Washington
12h 29m1 stop Dallas/Fort Worth
Frontier Logo
12:45 pm - 6:16 pmBWI  Baltimore/Washington-ONT Ontario
8h 31m1 stop Dallas/Fort Worth
$232Frontier
Mon, Sep 14 - Wed, Sep 16
Frontier Logo
7:46 pm - 12:00 pmONT  Ontario-BWI Baltimore/Washington
13h 14m1 stop Dallas/Fort Worth
Frontier Logo
1:29 pm - 6:39 pmBWI  Baltimore/Washington-ONT Ontario
8h 10m1 stop Dallas/Fort Worth
$232Frontier
Thu, Oct 1 - Mon, Oct 5
Multiple Airlines Logo
10:47 am - 3:40 pmONT  Ontario-BWI Baltimore/Washington
25h 53m1 stop Portland
Multiple Airlines Logo
12:45 pm - 6:16 pmBWI  Baltimore/Washington-ONT Ontario
8h 31m1 stop Dallas/Fort Worth
$303Multiple Airlines
Fri, Sep 11 - Wed, Sep 30
Multiple Airlines Logo
6:02 am - 6:08 pmONT  Ontario-BWI Baltimore/Washington
9h 06m1 stop Seattle/Tacoma Intl
Multiple Airlines Logo
12:45 pm - 6:16 pmBWI  Baltimore/Washington-ONT Ontario
8h 31m1 stop Dallas/Fort Worth
$322Multiple Airlines
Tue, Sep 15 - Wed, Sep 16
Delta Logo
5:15 pm - 6:18 amONT  Ontario-BWI Baltimore/Washington
10h 03m1 stop Salt Lake City
Delta Logo
6:00 am - 11:05 amBWI  Baltimore/Washington-ONT Ontario
8h 05m1 stop Atlanta Hartsfield-Jackson
$387Delta
Fri, Sep 11 - Tue, Sep 15
Delta Logo
5:15 pm - 6:18 amONT  Ontario-BWI Baltimore/Washington
10h 03m1 stop Salt Lake City
Delta Logo
7:35 am - 12:14 pmBWI  Baltimore/Washington-ONT Ontario
7h 39m1 stop Salt Lake City
$387Delta
Fri, Sep 11 - Tue, Sep 15
United Airlines Logo
6:00 am - 4:31 pmONT  Ontario-BWI Baltimore/Washington
7h 31m1 stop Houston George Bush Intcntl
United Airlines Logo
6:05 am - 12:50 pmBWI  Baltimore/Washington-ONT Ontario
9h 45m2 stops Chicago O'Hare Intl Denver Intl
$392United Airlines
Sun, Sep 6 - Wed, Sep 9
Southwest Logo
8:35 am - 8:15 pmONT  Ontario-BWI Baltimore/Washington
8h 40m2 stops Phoenix Sky Harbor Intl Denver Intl
Southwest Logo
6:35 am - 1:25 pmBWI  Baltimore/Washington-ONT Ontario
9h 50m2 stops Los Angeles Los Angeles Phoenix Sky Harbor Intl
$397Southwest
Wed, Sep 9 - Fri, Sep 11
Southwest Logo
5:15 am - 7:35 pmONT  Ontario-BWI Baltimore/Washington
11h 20m2 stops Phoenix Sky Harbor Intl Austin Bergstrom
Southwest Logo
8:30 am - 2:30 pmBWI  Baltimore/Washington-ONT Ontario
9h 00m2 stops Richmond Byrd Intl Nashville Intl
$397Southwest
Thu, Aug 27 - Sat, Sep 5
United Airlines Logo
6:00 am - 6:55 pmONT  Ontario-BWI Baltimore/Washington
9h 55m2 stops San Francisco Chicago O'Hare Intl
United Airlines Logo
6:10 am - 12:33 pmBWI  Baltimore/Washington-ONT Ontario
9h 23m2 stops Chicago O'Hare Intl Denver Intl
$457United Airlines
Sat, Nov 14 - Tue, Nov 17

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Frontier flights from Ontario to Baltimore

Our best Frontier deals on Ontario to Baltimore flight tickets
Frontier
Aug 27
ONT9:33 amOntario
8h 04m
1 stop
BWI8:37 pmBaltimore/Washington
Sep 1
BWI1:24 pmBaltimore/Washington
8h 37m
1 stop
ONT7:01 pmOntario
$232
Frontier
Aug 27
ONT9:33 amOntario
8h 04m
1 stop
BWI8:37 pmBaltimore/Washington
Sep 2
BWI1:24 pmBaltimore/Washington
8h 37m
1 stop
ONT7:01 pmOntario
$233
Frontier
Aug 28
ONT9:33 amOntario
8h 04m
1 stop
BWI8:37 pmBaltimore/Washington
Sep 2
BWI1:24 pmBaltimore/Washington
8h 37m
1 stop
ONT7:01 pmOntario
$236

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 August 7, 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

Cheapest round-trip

OntarioBaltimore

ONT Ontario - BWI Baltimore/Washington

ONTBWI

Ontario

Mon 9/14

8:11 pm-11:40 am

1 stop12h 29m

Baltimore/Washington

Wed 9/16

12:45 pm-6:16 pm

1 stop8h 31m

$232

OntarioBaltimore

ONT Ontario - BWI Baltimore/Washington

ONTBWI

Ontario

Thu 10/1

7:46 pm-12:00 pm

1 stop13h 14m

Baltimore/Washington

Mon 10/5

1:29 pm-6:39 pm

1 stop8h 10m

$232

OntarioBaltimore

ONT Ontario - BWI Baltimore/Washington

ONTBWI

Ontario

Fri 9/11

10:47 am-3:40 pm

1 stop25h 53m

Baltimore/Washington

Wed 9/30

12:45 pm-6:16 pm

1 stop8h 31m

$303

OntarioBaltimore

ONT Ontario - BWI Baltimore/Washington

ONTBWI

Ontario

Tue 9/15

6:02 am-6:08 pm

1 stop9h 06m

Baltimore/Washington

Wed 9/16

12:45 pm-6:16 pm

1 stop8h 31m

$322

OntarioBaltimore

ONT Ontario - BWI Baltimore/Washington

ONTBWI

Ontario

Fri 9/11

5:15 pm-6:18 am

1 stop10h 03m

Baltimore/Washington

Tue 9/15

6:00 am-11:05 am

1 stop8h 05m

$387

OntarioBaltimore

ONT Ontario - BWI Baltimore/Washington

ONTBWI

Ontario

Fri 9/11

5:15 pm-6:18 am

1 stop10h 03m

Baltimore/Washington

Tue 9/15

7:35 am-12:14 pm

1 stop7h 39m

$387
Quickest round-trip

OntarioBaltimore

ONT Ontario - BWI Baltimore/Washington

ONTBWI

Ontario

Sun 9/6

6:00 am-4:31 pm

1 stop7h 31m

Baltimore/Washington

Wed 9/9

6:05 am-12:50 pm

2 stops9h 45m

$392

OntarioBaltimore

ONT Ontario - BWI Baltimore/Washington

ONTBWI

Ontario

Wed 9/9

8:35 am-8:15 pm

2 stops8h 40m

Baltimore/Washington

Fri 9/11

6:35 am-1:25 pm

2 stops9h 50m

$397

OntarioBaltimore

ONT Ontario - BWI Baltimore/Washington

ONTBWI

Ontario

Thu 8/27

5:15 am-7:35 pm

2 stops11h 20m

Baltimore/Washington

Sat 9/5

8:30 am-2:30 pm

2 stops9h 00m

$397

OntarioBaltimore

ONT Ontario - BWI Baltimore/Washington

ONTBWI

Ontario

Sat 11/14

6:00 am-6:55 pm

2 stops9h 55m

Baltimore/Washington

Tue 11/17

6:10 am-12:33 pm

2 stops9h 23m

$457

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 typical price of a round-trip flight between Ontario and Baltimore?

Prices are currently low for flights on this route.

Typical prices usually range from $430 to $513.
The lowest price recently found on this route was $232.

What is the cheapest month to fly to Baltimore?

If you’re not able to fly to Baltimore in February, then January is your next best option. Flight prices from Ontario to Baltimore during January average around $382.

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

The cheapest day to depart from Ontario to Baltimore is on a Wednesday. Travelers who choose to depart for Baltimore on a Wednesday will often find tickets for as low as $419. If your travel schedule is flexible, try to avoid departing on a Sunday because tickets tend to average around $522. 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 $282 when looking at flights departing in the afternoon. Flights at noon are often more expensive with an average ticket price of $516.

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 from Ontario 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 $458 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 $269 on momondo.

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

There is only 1 cabin class available to choose from on Ontario to Baltimore 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 2% 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 August 2026, prices for Ontario to Baltimore flights are approximately 5% 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

$262

Fastest flight time

4h 50m

Direct flights

None
The best one-way flight to Baltimore from Ontario in the past 72 hours is $262. The best round-trip flight deal from Ontario to Baltimore found on momondo in the last 72 hours is $459.
The fastest flight from Ontario to Baltimore takes 4h 50m
There are no direct flights from Ontario to Baltimore. Popular non-direct route for this connection is Ontario Airport - Baltimore/Washington Airport.
Search flight deals

Frequently asked questions about flying from Ontario to Baltimore

  • 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
DeltaPriceFrom $183Free CancellationRating
7.8
8,502 reviews
Search Delta flights
FrontierPriceFrom $202Free CancellationRating
5.6
2,722 reviews
Search Frontier flights
United AirlinesPriceFrom $256Free CancellationRating
7.4
10,084 reviews
Search United Airlines flights
SouthwestPriceFrom $352Free CancellationRating
8.0
4,217 reviews
Search Southwest flights
JetBluePriceFrom $361Free CancellationRating
7.1
3,024 reviews
Search JetBlue flights
American AirlinesPriceFrom $434Free CancellationRating
7.1
11,877 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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