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Delaware

$90+ 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 2/19. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — ILG
Feb 20 — Feb 271
Fri 2/20
Fri 2/27
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 January 21, 2026.

This Kiwi.com deal was found by Cheapflights users on 1/20. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/202:21 pm
ONT
-
PHL
1 stop17h 21m
Frontier
Mon 2/237:18 pm
PHL
-
ONT
2 stops29h 16m
Frontier
Deal found 1/20$176
This CheapOair deal was found by Cheapflights users on 1/20. 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 2/192:08 pm
ONT
-
PHL
1 stop24h 47m
Frontier
Thu 2/265:47 pm
PHL
-
ONT
1 stop9h 12m
Frontier
Deal found 1/20$180
This CheapOair deal was found by Cheapflights users on 1/19. 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.
Tue 4/76:20 am
ONT
-
PHL
1 stop20h 11m
Frontier
Mon 4/138:25 pm
PHL
-
ONT
1 stop30h 30m
Frontier
Deal found 1/19$181
This Expedia deal was found by Cheapflights users on 1/19. 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.
Wed 3/48:40 am
ONT
-
PHL
1 stop28h 57m
Frontier
Mon 3/98:00 am
PHL
-
ONT
1 stop16h 04m
Frontier
Deal found 1/19$199
This CheapOair deal was found by Cheapflights users on 1/20. 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 2/258:40 am
ONT
-
PHL
1 stop28h 57m
Frontier
Mon 3/25:47 pm
PHL
-
ONT
1 stop30h 47m
Frontier
Deal found 1/20$201
This CheapOair deal was found by Cheapflights users on 1/20. 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 4/26:20 am
ONT
-
PHL
1 stop20h 11m
Frontier
Mon 4/138:25 pm
PHL
-
ONT
1 stop30h 30m
Frontier
Deal found 1/20$209
This CheapOair deal was found by Cheapflights users on 1/21. 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 2/196:05 am
ONT
-
PHL
1 stop7h 32m
Frontier
Fri 2/277:05 pm
PHL
-
ONT
1 stop7h 54m
Frontier
Deal found 1/21$215
This CheapOair deal was found by Cheapflights users on 1/18. 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 4/86:20 am
ONT
-
PHL
1 stop20h 11m
Frontier
Sun 4/128:25 pm
PHL
-
ONT
1 stop30h 31m
Frontier
Deal found 1/18$216
This CheapOair deal was found by Cheapflights users on 1/20. 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
Mon 4/138:25 pm
PHL
-
ONT
1 stop30h 30m
Frontier
Deal found 1/20$222
This Frontier deal was found by Cheapflights users on 1/19. 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 2/276:00 am
ONT
-
PHL
1 stop8h 55m
Frontier
Mon 3/25:47 pm
PHL
-
ONT
1 stop9h 12m
Frontier
Deal found 1/19$235
This CheapOair deal was found by Cheapflights users on 1/18. 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 2/258:40 am
ONT
-
PHL
1 stop28h 57m
Frontier
Sun 3/15:47 pm
PHL
-
ONT
1 stop9h 12m
Frontier
Deal found 1/18$237

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 January 21, 2026.

Most accurate provider

Mytrip
3 stars

Most trusted provider

Mytrip
3 stars

Round-trip from

$176
(Kiwi.com)

One-way from

$90
(CheapOair)

Popular in

December

Cheapest in

August

Average price

$538
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. 23% potential increase in price ($122 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($14 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 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 January 21, 2026.
Use the filters below to find and compare flights from Ontario to Delaware that are best for you.

Fly from

Ontario

Fly to

Delaware

Route

Depart

Return

Price

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Tue 3/24

10:25 pm-9:22 am

1 stop7h 57m

Philadelphia

Wed 4/1

6:49 pm-11:51 pm

1 stop8h 02m

$297

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Tue 2/10

1:11 pm-11:53 pm

1 stop7h 42m

Philadelphia

Tue 2/17

7:00 am-12:07 pm

1 stop8h 07m

$297

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Wed 4/22

10:15 pm-9:22 am

1 stop8h 07m

Philadelphia

Sat 5/9

5:21 pm-10:09 pm

1 stop7h 48m

$297

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Thu 4/2

6:20 am-5:31 am

1 stop20h 11m

Philadelphia

Sun 4/5

8:25 pm-11:56 pm

1 stop30h 31m

$310

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Wed 4/22

10:15 pm-9:22 am

1 stop8h 07m

Philadelphia

Mon 5/11

7:05 am-12:49 pm

1 stop32h 44m

$311

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Tue 4/21

6:00 am-5:35 pm

1 stop8h 35m

Philadelphia

Mon 5/11

7:05 am-12:49 pm

1 stop32h 44m

$311

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Thu 4/30

3:26 pm-6:02 am

1 stop11h 36m

Philadelphia

Tue 5/5

7:22 am-2:32 pm

1 stop10h 10m

$325

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Tue 3/24

10:25 pm-9:22 am

1 stop7h 57m

Philadelphia

Mon 3/30

6:49 pm-11:51 pm

1 stop8h 02m

$334

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Mon 3/23

5:09 pm-5:41 am

1 stop9h 32m

Philadelphia

Wed 4/1

7:00 am-12:23 pm

1 stop8h 23m

$334

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Thu 2/19

7:20 am-8:50 pm

2 stops10h 30m

Philadelphia

Mon 2/23

1:40 pm-9:20 pm

2 stops10h 40m

$358

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/21

Showing 1-10 of 25 results
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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 $297, Delta can have you in Delaware from Ontario in 7h 57m. 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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