What is the cheapest airline that flies from Ontario to Maryland?

Frontier, Delta, and Alaska Airlines are the most popular carriers operating from Ontario to Maryland

What airlines fly to Maryland?

Southwest, United Airlines and Frontier are the top three most popular airlines that fly to Maryland from Ontario according to our data. Southwest is the first choice among our users, with 43% of people opting to fly with this airline when traveling to Maryland. Keep in mind that there are 6 different airlines that fly to Maryland on a routine basis, so you have a few additional options to choose from.

When did momondo last update prices for flights from Ontario Airport to Maryland?

Prices for flights from Ontario Airport to Maryland were last updated today.

How many operators does momondo search for flights from Ontario Airport to Maryland?

As of August 2026, there are 6 operators available to choose from for flights from Ontario Airport to Maryland.

How old do you have to be to fly from Ontario Airport to Maryland?

The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Ontario Airport to Maryland.

What documentation or ID do you need to fly to Maryland?

The travel and health documents required for your trip to Maryland can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Maryland. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

$114 Cheap Flights from Ontario to Maryland in 2026

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Ontario to Maryland

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

3:40 pm - 6:30 amONT Ontario-PHL Philadelphia

11h 50m1 stop Las Vegas Harry Reid Intl

8:00 am - 3:49 pmPHL Philadelphia-ONT Ontario

10h 49m1 stop Las Vegas Harry Reid Intl

$228Frontier

Thu, Aug 27 - Wed, Sep 2

3:40 pm - 6:30 amONT Ontario-PHL Philadelphia

11h 50m1 stop Las Vegas Harry Reid Intl

8:00 am - 3:49 pmPHL Philadelphia-ONT Ontario

10h 49m1 stop Las Vegas Harry Reid Intl

$228Frontier

Tue, Aug 25 - Tue, Sep 1

10:47 am - 4:00 pmONT Ontario-DCA Washington, D.C. Reagan-National

26h 13m1 stop Portland

6:00 pm - 11:47 pmDCA Washington, D.C. Reagan-National-ONT Ontario

8h 47m1 stop Denver Intl

$297Multiple Airlines

Thu, Sep 17 - Mon, Sep 21

10:47 am - 4:00 pmONT Ontario-DCA Washington, D.C. Reagan-National

26h 13m1 stop Portland

6:00 pm - 11:47 pmDCA Washington, D.C. Reagan-National-ONT Ontario

8h 47m1 stop Denver Intl

$297Multiple Airlines

Thu, Sep 17 - Mon, Sep 21

7:05 am - 7:58 pmONT Ontario-PHL Philadelphia

9h 53m1 stop Atlanta Hartsfield-Jackson

2:30 pm - 8:05 pmPHL Philadelphia-ONT Ontario

8h 35m1 stop Atlanta Hartsfield-Jackson

$310Delta

Sat, Sep 5 - Fri, Sep 11

12:33 pm - 12:19 amONT Ontario-PHL Philadelphia

8h 46m1 stop Dallas/Fort Worth

5:00 am - 9:34 amPHL Philadelphia-ONT Ontario

7h 34m1 stop Dallas/Fort Worth

$329American Airlines

Thu, Sep 3 - Sun, Sep 6

12:59 pm - 11:28 pmONT Ontario-PHL Philadelphia

7h 29m1 stop Phoenix Sky Harbor Intl

5:00 am - 9:34 amPHL Philadelphia-ONT Ontario

7h 34m1 stop Dallas/Fort Worth

$329American Airlines

Thu, Sep 3 - Sun, Sep 6

12:00 pm - 11:42 pmONT Ontario-PHL Philadelphia

8h 42m1 stop Atlanta Hartsfield-Jackson

6:00 am - 10:42 amPHL Philadelphia-ONT Ontario

7h 42m1 stop Atlanta Hartsfield-Jackson

$329Delta

Wed, Sep 2 - Sun, Sep 6

1:20 pm - 12:05 amONT Ontario-PHL Philadelphia

7h 45m1 stop Denver Intl

5:00 am - 9:35 amPHL Philadelphia-ONT Ontario

7h 35m1 stop Denver Intl

$340Southwest

Sun, Nov 22 - Thu, Nov 26

2:00 pm - 11:50 pmONT Ontario-PHL Philadelphia

6h 50m1 stop Denver Intl

4:05 pm - 10:05 pmPHL Philadelphia-ONT Ontario

9h 00m2 stops Denver Intl Phoenix Sky Harbor Intl

$345Southwest

Fri, Sep 11 - Fri, Sep 25

Cheap last minute flights

Enter your travel dates to find the best prices.

9:36 am - 8:34 pmONT Ontario-BWI Baltimore/Washington

7h 58m1 stop Houston George Bush Intcntl

1:24 pm - 7:01 pmBWI Baltimore/Washington-ONT Ontario

8h 37m1 stop Houston George Bush Intcntl

$300Frontier

Wed, Aug 12 - Wed, Sep 2

9:36 am - 8:34 pmONT Ontario-BWI Baltimore/Washington

7h 58m1 stop Houston George Bush Intcntl

1:24 pm - 7:01 pmBWI Baltimore/Washington-ONT Ontario

8h 37m1 stop Houston George Bush Intcntl

$300Frontier

Tue, Aug 11 - Sat, Aug 29

6:00 am - 6:48 pmONT Ontario-PHL Philadelphia

9h 48m1 stop Dallas/Fort Worth

7:05 am - 12:03 pmPHL Philadelphia-ONT Ontario

7h 58m1 stop Phoenix Sky Harbor Intl

$375American Airlines

Thu, Aug 13 - Sun, Aug 16

9:36 am - 8:34 pmONT Ontario-BWI Baltimore/Washington

7h 58m1 stop Houston George Bush Intcntl

4:43 pm - 9:48 amBWI Baltimore/Washington-ONT Ontario

20h 05m1 stop Portland

$395Multiple Airlines

Wed, Aug 12 - Mon, Aug 31

4:09 pm - 2:02 pmONT Ontario-IAD Washington, D.C. Dulles Intl

42h 53m2 stops Las Vegas Harry Reid Intl Nashville Intl

8:59 am - 8:03 amIAD Washington, D.C. Dulles Intl-ONT Ontario

26h 04m1 stop Las Vegas Harry Reid Intl

$425Multiple Airlines

Thu, Aug 13 - Sat, Aug 29

9:01 am - 9:22 pmONT Ontario-IAD Washington, D.C. Dulles Intl

9h 21m1 stop San Francisco

4:15 pm - 8:53 pmIAD Washington, D.C. Dulles Intl-ONT Ontario

7h 38m1 stop Denver Intl

$459United Airlines

Wed, Aug 12 - Sat, Aug 29

6:00 am - 7:14 pmONT Ontario-DCA Washington, D.C. Reagan-National

10h 14m1 stop Dallas/Fort Worth

6:59 am - 1:53 pmDCA Washington, D.C. Reagan-National-ONT Ontario

9h 54m1 stop Dallas/Fort Worth

$459American Airlines

Wed, Aug 12 - Sat, Aug 29

12:30 pm - 10:20 pmONT Ontario-DCA Washington, D.C. Reagan-National

6h 50m1 stop Houston Hobby

4:55 pm - 10:05 pmDCA Washington, D.C. Reagan-National-ONT Ontario

8h 10m2 stops Omaha Eppley Airfield Phoenix Sky Harbor Intl

$464Southwest

Wed, Aug 12 - Mon, Aug 31

7:45 am - 7:10 pmONT Ontario-DCA Washington, D.C. Reagan-National

8h 25m2 stops Las Vegas Harry Reid Intl Chicago Midway

6:05 am - 12:30 pmDCA Washington, D.C. Reagan-National-ONT Ontario

9h 25m2 stops Chicago Midway Dallas Love Field

$469Southwest

Wed, Aug 12 - Wed, Sep 2

6:08 am - 4:18 pmONT Ontario-IAD Washington, D.C. Dulles Intl

7h 10m1 stop San Francisco

2:43 pm - 8:54 pmIAD Washington, D.C. Dulles Intl-ONT Ontario

9h 11m1 stop Denver Intl

$491United Airlines

Wed, Aug 12 - Wed, Sep 2

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Frontier flights from Ontario to Maryland

Our best Frontier deals on Ontario to Maryland flight tickets

Frontier

Aug 27

ONT3:40 pmOntario

11h 50m

1 stop

PHL6:30 amPhiladelphia

Sep 3

PHL7:00 amPhiladelphia

12h 22m

1 stop

ONT4:22 pmOntario

$228

Frontier

Sep 5

ONT11:50 amOntario

15h 40m

1 stop

PHL6:30 amPhiladelphia

Sep 12

PHL6:00 amPhiladelphia

13h 46m

1 stop

ONT4:46 pmOntario

$229

Frontier

Sep 3

ONT9:33 amOntario

8h 04m

1 stop

BWI8:37 pmBaltimore/Washington

Sep 9

BWI12:45 pmBaltimore/Washington

8h 31m

1 stop

ONT6:16 pmOntario

$232

Delta flights from Ontario to Maryland

Our best Delta deals on Ontario to Maryland flight tickets

Delta

Sep 5

ONT7:05 amOntario

9h 53m

1 stop

PHL7:58 pmPhiladelphia

Sep 11

PHL2:30 pmPhiladelphia

8h 35m

1 stop

ONT8:05 pmOntario

$310

Delta

Aug 29

ONT12:00 pmOntario

9h 34m

1 stop

IAD12:34 amWashington, D.C. Dulles Intl

Sep 5

IAD6:00 amWashington, D.C. Dulles Intl

7h 42m

1 stop

ONT10:42 amOntario

$351

Delta

Aug 27

ONT10:00 pmOntario

8h 20m

1 stop

IAD9:20 amWashington, D.C. Dulles Intl

Sep 2

IAD6:00 amWashington, D.C. Dulles Intl

7h 42m

1 stop

ONT10:42 amOntario

$352

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OntarioPhiladelphia

ONT Ontario - PHL Philadelphia

ONTPHL

Ontario

Thu 8/27

3:40 pm-6:30 am

1 stop11h 50m

Philadelphia

Wed 9/2

8:00 am-3:49 pm

1 stop10h 49m

$228

OntarioPhiladelphia

ONT Ontario - PHL Philadelphia

ONTPHL

Ontario

Tue 8/25

3:40 pm-6:30 am

1 stop11h 50m

Philadelphia

Tue 9/1

8:00 am-3:49 pm

1 stop10h 49m

$228

OntarioWashington, D.C.

ONT Ontario - DCA Washington, D.C. Reagan-National

ONTDCA

Ontario

Thu 9/17

10:47 am-4:00 pm

1 stop26h 13m

Washington, D.C. Reagan-National

Mon 9/21

6:00 pm-11:47 pm

1 stop8h 47m

$297

OntarioWashington, D.C.

ONT Ontario - DCA Washington, D.C. Reagan-National

ONTDCA

Ontario

Thu 9/17

10:47 am-4:00 pm

1 stop26h 13m

Washington, D.C. Reagan-National

Mon 9/21

6:00 pm-11:47 pm

1 stop8h 47m

$297

OntarioPhiladelphia

ONT Ontario - PHL Philadelphia

ONTPHL

Ontario

Sat 9/5

7:05 am-7:58 pm

1 stop9h 53m

Philadelphia

Fri 9/11

2:30 pm-8:05 pm

1 stop8h 35m

$310

OntarioPhiladelphia

ONT Ontario - PHL Philadelphia

ONTPHL

Ontario

Thu 9/3

12:33 pm-12:19 am

1 stop8h 46m

Philadelphia

Sun 9/6

5:00 am-9:34 am

1 stop7h 34m

$329

Quickest round-trip

OntarioPhiladelphia

ONT Ontario - PHL Philadelphia

ONTPHL

Ontario

Thu 9/3

12:59 pm-11:28 pm

1 stop7h 29m

Philadelphia

Sun 9/6

5:00 am-9:34 am

1 stop7h 34m

$329

OntarioPhiladelphia

ONT Ontario - PHL Philadelphia

ONTPHL

Ontario

Wed 9/2

12:00 pm-11:42 pm

1 stop8h 42m

Philadelphia

Sun 9/6

6:00 am-10:42 am

1 stop7h 42m

$329

OntarioPhiladelphia

ONT Ontario - PHL Philadelphia

ONTPHL

Ontario

Sun 11/22

1:20 pm-12:05 am

1 stop7h 45m

Philadelphia

Thu 11/26

5:00 am-9:35 am

1 stop7h 35m

$340

OntarioPhiladelphia

ONT Ontario - PHL Philadelphia

ONTPHL

Ontario

Fri 9/11

2:00 pm-11:50 pm

1 stop6h 50m

Philadelphia

Fri 9/25

4:05 pm-10:05 pm

2 stops9h 00m

$345

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from Ontario to Maryland

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

Prices

Airlines

What is the cheapest month to fly to Maryland?

The cheapest month to fly to Maryland from Ontario is in February. Flight prices, which tend to average around $363, are often lower during this time because this is during the off-season. If you don’t want to visit Maryland in February, then you should wait until January to fly from Ontario, when ticket prices are also cheap, with an average price of $380.

What is the cheapest Ontario to Maryland flight route?

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

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

There is only 1 cabin class available to choose from on Ontario to Maryland 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 Maryland flights?

You could potentially save up to 2% on your flight if you consider stops on a Ontario to Maryland flight.

Cheap Ontario to Maryland flight deals and tips

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

Best Price Found	$262
Fastest flight time	6h 46m
Direct flights	None

The best one-way flight to Maryland from Ontario in the past 72 hours is $262. The best round-trip flight deal from Ontario to Maryland found on momondo in the last 72 hours is $541.

The fastest flight from Ontario to Maryland takes 6h 46m

There are no direct flights from Ontario to Maryland. Popular non-direct route for this connection is Ontario Airport - Baltimore/Washington Airport.

Search flight deals

Frequently asked questions about flying from Ontario to Maryland

When did momondo last update prices for flights from Ontario Airport to Maryland?
Prices for flights from Ontario Airport to Maryland were last updated today.
How many operators does momondo search for flights from Ontario Airport to Maryland?
As of August 2026, there are 6 operators available to choose from for flights from Ontario Airport to Maryland.
How old do you have to be to fly from Ontario Airport to Maryland?
The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Ontario Airport to Maryland.
What documentation or ID do you need to fly to Maryland?
The travel and health documents required for your trip to Maryland can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Maryland. We always recommend checking with your airline or a trusted third party such as IATA to get advice.
What is the most popular plane model from Ontario to Maryland?
momondo data reveals that the most frequently booked plane model on the route from Ontario to Maryland is Airbus A318/A319/A320/A321, representing 16.22% of all bookings. The subsequent popular models are Boeing 737 MAX 8 at 10.81%, Boeing 737-800 Passenger/BBJ2 (winglets) at 10.81%, and Boeing 737 MAX 9 at 9.46%.

Best airlines flying from Ontario to Maryland

Compare and see reviews for airlines that fly from Ontario to Maryland with momondo

Airline	Rating	Free Cancellation	Price
Delta	PriceFrom $183	Free Cancellation	Rating 7.8 8,504 reviews	Search Delta flights
Frontier	PriceFrom $221	Free Cancellation	Rating 5.6 2,720 reviews	Search Frontier flights
United Airlines	PriceFrom $256	Free Cancellation	Rating 7.4 10,086 reviews	Search United Airlines flights
Southwest	PriceFrom $352	Free Cancellation	Rating 8.0 4,216 reviews	Search Southwest flights
JetBlue	PriceFrom $361	Free Cancellation	Rating 7.1 3,030 reviews	Search JetBlue flights
American Airlines	PriceFrom $434	Free Cancellation	Rating 7.1 11,889 reviews	Search American Airlines flights

Why use momondo?

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

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Ontario to Maryland. Millions of users trust and use momondo every year so you are in good hands.

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

Yes. momondo allows you to filter the results for Ontario to Maryland flights to just show those with flexible booking policies.

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

momondo helps you find the best flight between Ontario and Maryland by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

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

If you are simply researching potential flights to Maryland, momondo offers a useful price alert feature which will track prices for flights to Maryland from Ontario and alert you when they change.