HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Delaware

$118+ 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 8/14. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — ILG
Jul 21 — Jul 281
Tue 7/21
Tue 7/28
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Ontario to Delaware with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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 June 21, 2026.

This Frontier deal was found by Cheapflights users on 6/17. 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.
Wed 8/196:47 pm
ONT
-
PHL
1 stop12h 43m
Frontier
Sat 8/2210:46 am
PHL
-
ONT
1 stop12h 02m
Frontier
Deal found 6/17$295
This Frontier deal was found by Cheapflights users on 6/17. 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 7/118:17 am
ONT
-
PHL
1 stop8h 12m
Frontier
Tue 7/2112:44 pm
PHL
-
ONT
1 stop14h 06m
Frontier
Deal found 6/17$297
This Frontier deal was found by Cheapflights users on 6/18. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/81:38 pm
ONT
-
PHL
1 stop13h 22m
Frontier
Mon 7/2012:54 pm
PHL
-
ONT
1 stop13h 56m
Frontier
Deal found 6/18$299
This Kiwi.com deal was found by Cheapflights users on 6/17. 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.
Wed 9/162:55 pm
ONT
-
PHL
1 stop11h 41m
Frontier
Tue 10/68:44 pm
PHL
-
ONT
1 stop30h 11m
Frontier
Deal found 6/17$300
This Frontier deal was found by Cheapflights users on 6/20. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/98:17 am
ONT
-
PHL
1 stop13h 44m
Frontier
Mon 7/1311:06 am
PHL
-
ONT
1 stop7h 48m
Frontier
Deal found 6/20$301
This Booking.com deal was found by Cheapflights users on 6/16. 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.
Mon 7/611:52 am
ONT
-
PHL
1 stop15h 08m
Frontier
Wed 7/811:06 am
PHL
-
ONT
1 stop23h 57m
Frontier
Deal found 6/16$302
This Frontier deal was found by Cheapflights users on 6/21. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/231:33 pm
ONT
-
PHL
1 stop13h 54m
Frontier
Mon 7/2012:54 pm
PHL
-
ONT
1 stop13h 56m
Frontier
Deal found 6/21$303
This Frontier deal was found by Cheapflights users on 6/20. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/183:40 pm
ONT
-
PHL
1 stop11h 20m
Frontier
Thu 7/2312:44 pm
PHL
-
ONT
1 stop14h 06m
Frontier
Deal found 6/20$304
This Frontier deal was found by Cheapflights users on 6/18. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/173:40 pm
ONT
-
PHL
1 stop11h 20m
Frontier
Wed 7/2212:44 pm
PHL
-
ONT
1 stop14h 06m
Frontier
Deal found 6/18$305
This Frontier deal was found by Cheapflights users on 6/18. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/118:17 am
ONT
-
PHL
1 stop8h 12m
Frontier
Fri 7/2412:54 pm
PHL
-
ONT
1 stop13h 56m
Frontier
Deal found 6/18$306
This Frontier deal was found by Cheapflights users on 6/17. 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 7/113:40 pm
ONT
-
PHL
1 stop11h 20m
Frontier
Thu 7/1612:44 pm
PHL
-
ONT
1 stop14h 06m
Frontier
Deal found 6/17$307
This Trip.com deal was found by Cheapflights users on 6/19. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/76:00 am
ONT
-
PHL
1 stop20h 39m
Frontier
Sat 8/89:51 am
PHL
-
ONT
2 stops25h 12m
Frontier
Deal found 6/19$308

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 June 21, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$295
(Frontier)

One-way from

$118
(Super.com)

Popular in

December

Cheapest in

September

Average price

$493
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. 11% potential increase in price ($57 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($8 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in June 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 June 21, 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

Sat 9/19

11:59 am-12:56 am

1 stop9h 57m

Philadelphia

Thu 10/8

6:40 pm-11:48 pm

1 stop8h 08m

$359

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Wed 8/5

9:40 am-9:50 pm

2 stops9h 10m

Philadelphia

Sun 8/9

5:00 am-11:35 am

2 stops9h 35m

$395

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Mon 7/20

10:00 pm-9:31 am

1 stop8h 31m

Philadelphia

Tue 7/28

12:02 pm-6:30 pm

1 stop9h 28m

$409
Quickest round-trip

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Fri 7/3

2:30 pm-12:40 am

1 stop7h 10m

Philadelphia

Sat 7/4

1:00 pm-6:45 pm

2 stops8h 45m

$414

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Fri 9/18

8:30 am-9:05 pm

2 stops9h 35m

Philadelphia

Tue 10/6

1:40 pm-7:25 pm

2 stops8h 45m

$419

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Sat 7/25

9:50 am-11:40 pm

2 stops10h 50m

Philadelphia

Thu 7/30

5:20 pm-12:10 am

2 stops9h 50m

$452

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Wed 11/18

6:53 pm-7:45 am

1 stop9h 52m

Philadelphia

Mon 11/23

6:10 am-12:20 pm

1 stop9h 10m

$464

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Tue 8/4

1:50 pm-5:31 am

2 stops12h 41m

Philadelphia

Wed 8/12

6:00 am-12:12 pm

1 stop9h 12m

$470

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Wed 8/5

5:45 am-6:57 pm

1 stop10h 12m

Philadelphia

Fri 8/14

10:34 am-8:01 pm

2 stops12h 27m

$474

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Tue 8/4

1:50 pm-5:31 am

2 stops12h 41m

Philadelphia

Fri 8/14

10:34 am-10:59 pm

2 stops15h 25m

$479

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/19

Showing 1-10 of 25 resultsSorted by cheapest first
1
2
3

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 $395, Delta can have you in Delaware from Ontario in 9h 10m. 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Ontario to Delaware

See prices for flight routes from nearby airports that may be better suited for you.
San Francisco to Newark flights
San Francisco to John F Kennedy Intl flights
Los Angeles to Honolulu flights
San Francisco to LaGuardia flights
Ontario to Honolulu flights
Burbank to Honolulu flights
Long Beach to Honolulu flights
San Francisco to Seattle flights
Los Angeles to Seattle flights
Los Angeles to Newark flights
Los Angeles to John F Kennedy Intl flights
Ontario to Seattle flights
Los Angeles to Dallas/Fort Worth flights
Los Angeles to Las Vegas flights
Los Angeles to O'Hare Intl flights
Los Angeles to LaGuardia flights
San Francisco to Las Vegas flights
Ontario to John F Kennedy Intl flights
San Francisco to Dallas/Fort Worth flights
San Jose to Seattle flights
San Francisco to Los Angeles flights
Santa Rosa to Las Vegas flights
San Francisco to Everett flights
San Francisco to O'Hare Intl flights
Santa Ana to Seattle flights
Ontario to O'Hare Intl flights
Los Angeles to Hobby flights
Los Angeles to Miami flights
San Jose to Newark flights
Ontario to San Francisco flights
Los Angeles to San Francisco flights
San Francisco to Ontario flights
San Jose to John F Kennedy Intl flights
Los Angeles to Boston flights
Santa Rosa to San Diego flights
Los Angeles to Atlanta flights
Oakland to John F Kennedy Intl flights
Los Angeles to Orlando flights
Los Angeles to Portland flights
Ontario to Dallas/Fort Worth flights
San Francisco to Denver flights
San Francisco to Honolulu flights
Los Angeles to Reagan-National flights
Los Angeles to George Bush Intcntl flights
San Francisco to Boston flights
San Diego to Seattle flights
Los Angeles to Baltimore flights
San Jose to Las Vegas flights

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.