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Cheap flights from Ontario to Maryland from $104

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 Maryland departing on 9/3. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Find the cheapest flights from Ontario to Maryland

Cheap round-trip flights

Frontier Logo
12:59 am - 12:11 pmONT-DCA
8h 12m1 stop
Frontier Logo
6:00 pm - 11:50 pmDCA-ONT
8h 50m1 stop
$252Frontier
Find Deal
Fri, Aug 22 - Sat, Aug 30
Frontier Logo
12:59 am - 12:04 pmONT-DCA
8h 05m1 stop
Frontier Logo
6:00 pm - 11:50 pmDCA-ONT
8h 50m1 stop
$255Frontier
Find Deal
Mon, Aug 11 - Sat, Aug 16
Delta Logo
11:45 am - 11:21 pmONT-IAD
8h 36m1 stop
Delta Logo
12:39 pm - 7:11 pmIAD-ONT
9h 32m1 stop
$276Delta
Find Deal
Sat, Aug 30 - Sat, Sep 6
Delta Logo
7:05 am - 5:20 pmONT-DCA
7h 15m1 stop
Delta Logo
6:00 am - 10:20 amDCA-ONT
7h 20m1 stop
$277Delta
Find Deal
Sat, Aug 23 - Sat, Aug 30
American Airlines Logo
4:54 pm - 8:42 amONT-IAD
12h 48m2 stops
American Airlines Logo
5:40 pm - 10:33 pmIAD-ONT
7h 53m1 stop
$284American Airlines
Find Deal
Sat, Aug 23 - Sat, Sep 6
American Airlines Logo
12:22 pm - 11:59 pmONT-DCA
8h 37m2 stops
American Airlines Logo
3:25 pm - 9:39 pmDCA-ONT
9h 14m2 stops
$289American Airlines
Find Deal
Thu, Aug 21 - Mon, Aug 25
United Airlines Logo
6:04 am - 6:41 pmONT-DCA
9h 37m1 stop
United Airlines Logo
7:00 am - 12:13 pmDCA-ONT
8h 13m1 stop
$319United Airlines
Find Deal
Mon, Aug 25 - Mon, Sep 1
United Airlines Logo
6:36 pm - 5:26 amONT-PHL
7h 50m1 stop
United Airlines Logo
5:06 pm - 10:30 pmPHL-ONT
8h 24m1 stop
$320United Airlines
Find Deal
Wed, Oct 1 - Tue, Oct 7
Southwest Logo
10:55 am - 6:50 pmONT-BWI
4h 55mnonstop
Southwest Logo
2:20 pm - 6:25 pmBWI-ONT
7h 05m1 stop
$322Southwest
Find Deal
Wed, Aug 27 - Wed, Sep 3
Southwest Logo
10:55 am - 6:50 pmONT-BWI
4h 55mnonstop
Southwest Logo
9:20 am - 11:35 amBWI-ONT
5h 15mnonstop
$329Southwest
Find Deal
Wed, Aug 27 - Wed, Sep 3

Frontier flights from Ontario to Maryland

Our best Frontier deals on Ontario to Maryland flight tickets
Frontier
Aug 22
ONT12:59 amOntario
8h 12m
1 stop
DCA12:11 pmWashington, D.C. Reagan-National
Aug 30
DCA6:00 pmWashington, D.C. Reagan-National
8h 50m
1 stop
ONT11:50 pmOntario
$252
Find similar
Frontier
Aug 11
ONT12:59 amOntario
8h 05m
1 stop
DCA12:04 pmWashington, D.C. Reagan-National
Aug 16
DCA6:00 pmWashington, D.C. Reagan-National
8h 50m
1 stop
ONT11:50 pmOntario
$255
Find similar
Frontier
Aug 22
ONT12:59 amOntario
8h 12m
1 stop
DCA12:11 pmWashington, D.C. Reagan-National
Aug 30
DCA6:00 pmWashington, D.C. Reagan-National
8h 50m
1 stop
ONT11:50 pmOntario
$256
Find similar

United Airlines flights from Ontario to Maryland

Our best United Airlines deals on Ontario to Maryland flight tickets
United Airlines
Aug 25
ONT6:04 amOntario
9h 37m
1 stop
DCA6:41 pmWashington, D.C. Reagan-National
Sep 1
DCA7:00 amWashington, D.C. Reagan-National
8h 13m
1 stop
ONT12:13 pmOntario
$319
Find similar
United Airlines
Oct 1
ONT6:36 pmOntario
7h 50m
1 stop
PHL5:26 amPhiladelphia
Oct 7
PHL5:06 pmPhiladelphia
8h 24m
1 stop
ONT10:30 pmOntario
$320
Find similar
United Airlines
Sep 6
ONT6:50 pmOntario
9h 10m
1 stop
IAD7:00 amWashington, D.C. Dulles Intl
Sep 13
IAD6:35 amWashington, D.C. Dulles Intl
8h 38m
1 stop
ONT12:13 pmOntario
$353
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Ontario to Maryland 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 July 31, 2025.
Use the filters below to find and compare flights from Ontario to Maryland that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Fri 8/22

12:59 am-12:11 pm

1 stop8h 12m

Washington, D.C. Reagan-National

Sat 8/30

6:00 pm-11:50 pm

1 stop8h 50m

$252

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Mon 8/11

12:59 am-12:04 pm

1 stop8h 05m

Washington, D.C. Reagan-National

Sat 8/16

6:00 pm-11:50 pm

1 stop8h 50m

$255

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Sat 8/30

11:45 am-11:21 pm

1 stop8h 36m

Washington, D.C. Dulles Intl

Sat 9/6

12:39 pm-7:11 pm

1 stop9h 32m

$276

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Sat 8/23

7:05 am-5:20 pm

1 stop7h 15m

Washington, D.C. Reagan-National

Sat 8/30

6:00 am-10:20 am

1 stop7h 20m

$277

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Sat 8/23

4:54 pm-8:42 am

2 stops12h 48m

Washington, D.C. Dulles Intl

Sat 9/6

5:40 pm-10:33 pm

1 stop7h 53m

$284

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Thu 8/21

12:22 pm-11:59 pm

2 stops8h 37m

Washington, D.C. Reagan-National

Mon 8/25

3:25 pm-9:39 pm

2 stops9h 14m

$289

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Mon 8/25

6:04 am-6:41 pm

1 stop9h 37m

Washington, D.C. Reagan-National

Mon 9/1

7:00 am-12:13 pm

1 stop8h 13m

$319

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Wed 10/1

6:36 pm-5:26 am

1 stop7h 50m

Philadelphia

Tue 10/7

5:06 pm-10:30 pm

1 stop8h 24m

$320

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Wed 8/27

10:55 am-6:50 pm

Nonstop4h 55m

Baltimore/Washington

Wed 9/3

2:20 pm-6:25 pm

1 stop7h 05m

$322

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Wed 8/27

10:55 am-6:50 pm

Nonstop4h 55m

Baltimore/Washington

Wed 9/3

9:20 am-11:35 am

Nonstop5h 15m

$329

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 Maryland from

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

What is the cheapest month to fly to Maryland?

The cheapest month to fly to Maryland from Ontario is in May. Flight prices, which tend to average around $228, are often lower during this time because this is during the off-season. If you don’t want to visit Maryland in May, then you should wait until August to fly from Ontario, when ticket prices are also cheap, with an average price of $260.

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

The cheapest day to depart from Ontario to Maryland is on a Wednesday. Travelers who choose to depart for Maryland on a Wednesday will often find tickets for as low as $314. The most expensive day to fly to Maryland is Sunday, with ticket prices averaging around $492.

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

Our most recent data shows that the best time of day to fly to Maryland is in the afternoon. Flights from Ontario to Maryland during this time can be as low as $288. In contrast, the most expensive time of day to depart to Maryland is at noon when prices are around $423.

What is the cheapest Ontario to Maryland flight route?

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

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

You are more likely to see cheaper flights to Maryland from Ontario when booking weeks ahead of your departure date. In general, you can expect to find flights to Maryland for around $445 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Maryland from Ontario for as low as $319 on momondo.

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

There are 1 cabin classes 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?

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

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

$104

Fastest flight time

4h 45m

Direct flights

Every day

Airports in Maryland

4 airports
The best one-way flight to Maryland from Ontario in the past 72 hours is $104. The best round-trip flight deal from Ontario to Maryland found on momondo in the last 72 hours is $252.
The fastest flight from Ontario to Maryland takes 4h 45m
Direct flights go from Ontario to Maryland every day.
There are 4 airports near Maryland: Washington, D.C. Reagan-National (DCA), Philadelphia (PHL), Baltimore/Washington (BWI), Washington, D.C. Dulles Intl (IAD)
Search flight deals

  • 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?

  • 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?

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
Spirit AirlinesPriceFrom $98Free CancellationRating
6.3
8,048 reviews
Search Spirit Airlines flights
FrontierPriceFrom $148Free CancellationRating
5.9
3,239 reviews
Search Frontier flights
DeltaPriceFrom $296Free CancellationRating
8.0
7,981 reviews
Search Delta flights
United AirlinesPriceFrom $321Free CancellationRating
7.4
8,900 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

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.

An easier way to manage your Maryland trip

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