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Delaware

$79+ Cheap flights from Ontario (ONT) to Delaware

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 4/21. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — ILG
Apr 24 — May 11
Fri 4/24
Fri 5/1
1 adult, Economy
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Cheap flight deals from Ontario to Delaware

Cheapest flights from Ontario to Delaware
Explore the most affordable flight options available from Ontario to Delaware. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 25, 2026.

This Expedia deal was found by Cheapflights users on 3/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/175:33 pm
ONT
-
PHL
1 stop9h 01m
Frontier
Sun 4/193:27 pm
PHL
-
ONT
1 stop11h 29m
Frontier
Deal found 3/24$160
This Frontier deal was found by Cheapflights users on 3/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/2412:59 am
ONT
-
PHL
1 stop25h 36m
Frontier
Sat 5/28:41 pm
PHL
-
ONT
1 stop13h 45m
Frontier
Deal found 3/23$162
This Mytrip deal was found by Cheapflights users on 3/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/1512:59 am
ONT
-
PHL
1 stop25h 35m
Frontier
Mon 4/203:41 pm
PHL
-
ONT
1 stop11h 02m
Frontier
Deal found 3/24$166
This Booking.com deal was found by Cheapflights users on 3/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/217:44 pm
ONT
-
PHL
1 stop8h 06m
Frontier
Tue 4/288:36 pm
PHL
-
ONT
1 stop30h 19m
Frontier
Deal found 3/23$167
This CheapOair deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/2211:44 am
ONT
-
PHL
1 stop14h 29m
Frontier
Wed 4/298:31 pm
PHL
-
ONT
1 stop14h 00m
Frontier
Deal found 3/25$171
This Frontier deal was found by Cheapflights users on 3/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/147:44 pm
ONT
-
PHL
1 stop8h 06m
Frontier
Fri 4/243:22 pm
PHL
-
ONT
1 stop11h 36m
Frontier
Deal found 3/24$185
This Frontier deal was found by Cheapflights users on 3/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/1811:44 am
ONT
-
PHL
1 stop14h 29m
Frontier
Sat 4/258:00 am
PHL
-
ONT
1 stop13h 49m
Frontier
Deal found 3/23$187
This Expedia deal was found by Cheapflights users on 3/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/116:20 am
ONT
-
PHL
1 stop20h 10m
Frontier
Sat 4/188:00 am
PHL
-
ONT
1 stop13h 49m
Frontier
Deal found 3/23$190
This CheapOair deal was found by Cheapflights users on 3/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/96:20 am
ONT
-
PHL
1 stop20h 11m
Frontier
Fri 4/178:36 pm
PHL
-
ONT
1 stop30h 19m
Frontier
Deal found 3/21$191
This Booking.com deal was found by Cheapflights users on 3/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/305:43 pm
ONT
-
PHL
1 stop8h 51m
Frontier
Mon 5/48:41 pm
PHL
-
ONT
1 stop16h 24m
Frontier
Deal found 3/23$192

Find flight deals from Ontario to Delaware

Keep the following information in mind while searching for Ontario to Delaware flight deals. Data was last updated March 25, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$160
(Expedia)

One-way from

$79
(Super.com)

Popular in

December

Cheapest in

July

Average price

$515
Provider with most accurate pricing for Los Angeles-Philadelphia flight deals.
Search Deals
Provider most trusted by Cheapflights users for Los Angeles-Philadelphia flights.
Search Deals
From Ontario to Delaware
Search Deals
One-way flight from Ontario to Delaware
Search Deals
Highest demand for flights based on searches. 19% potential increase in price ($103 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($13 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ontario to Delaware 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, Cheapflights users made 2,558,603 searches. Data last updated March 25, 2026.
Use the filters below to find and compare flights from Ontario to Delaware that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Wed 4/22

6:49 pm-8:15 am

1 stop10h 26m

Philadelphia

Sat 5/2

9:55 am-10:59 pm

2 stops16h 04m

$425

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Tue 5/19

5:50 pm-5:37 am

1 stop8h 47m

Philadelphia

Sun 5/24

7:25 am-12:19 pm

1 stop7h 54m

$432

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Sat 5/16

5:45 pm-5:37 am

1 stop8h 52m

Philadelphia

Fri 5/22

7:25 am-12:19 pm

1 stop7h 54m

$432

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Tue 4/21

1:34 pm-12:59 am

2 stops8h 25m

Philadelphia

Tue 5/5

5:05 pm-10:35 pm

1 stop8h 30m

$444

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Fri 5/8

12:40 pm-12:35 am

2 stops8h 55m

Philadelphia

Mon 5/11

2:15 pm-9:15 pm

2 stops10h 00m

$458

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Wed 4/29

6:49 pm-8:15 am

1 stop10h 26m

Philadelphia

Sat 5/2

10:00 am-8:36 pm

2 stops13h 36m

$461

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Mon 7/13

5:05 pm-5:43 am

1 stop9h 38m

Philadelphia

Fri 7/31

5:20 pm-10:09 pm

1 stop7h 49m

$477

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Thu 7/23

5:16 pm-6:13 am

1 stop9h 57m

Philadelphia

Thu 7/30

6:55 pm-11:44 pm

1 stop7h 49m

$477
Quickest round-trip

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Sun 5/17

10:00 pm-9:27 am

1 stop8h 27m

Philadelphia

Sun 5/24

7:25 am-12:19 pm

1 stop7h 54m

$477

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Sat 8/1

5:16 pm-6:13 am

1 stop9h 57m

Philadelphia

Fri 8/14

10:38 am-6:01 pm

1 stop10h 23m

$477

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/23

Showing 1-10 of 25 resultsSorted by cheapest first
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Best time to book a flight from Ontario to Delaware

Have a flexible travel schedule? Discover the best time to fly to Delaware from Ontario with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Ontario to Delaware
No data available for this route at this time. Please check back soon.

Related info for your journey

Find useful and relevant information for your journey from Ontario to Delaware. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Ontario to Delaware?

    Located just 3.1 mi from the city center, Ontario (ONT) is the airport most travelers will use when flying to Delaware from Ontario.

  • How long is the flight from Ontario to Delaware?

    For as low as $432, United Airlines can have you in Delaware from Ontario in 8h 47m. The distance between Ontario and Delaware is about 2349 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • Can I find deals for flights from Ontario to Delaware that include hotel bookings?

    Yes. In addition to deals on Ontario to Delaware flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Ontario to Delaware?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to Delaware.

  • Can I find deals for business class flights from Ontario to Delaware?

    Yes. Cheapflights offers flight deals from Ontario to Delaware by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

See more FAQs

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