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Delaware

$108+ 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 4/30. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — ILG
Apr 2 — Apr 91
Wed 4/2
Wed 4/9
1 adult, Economy
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Cheap 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 28, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$240
(CheapOair)

One-way from

$108
(Trip.com)

Popular in

June

Cheapest in

September

Average price

$442
Provider with most accurate pricing for Los Angeles-Philadelphia flight deals.
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From Ontario to Delaware
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One-way flight from Ontario to Delaware
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Highest demand for flights based on searches. 7% potential increase in price ($31 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($6 potential savings vs. average RT price).
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Average for round-trip flights in March 2025
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Find 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 28, 2025.

This CheapOair deal was found by Cheapflights users on 3/27. 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 4/3010:44 amONT - PHL
1 stop17h 03mFrontier
Sun 5/46:54 pmPHL - ONT
1 stop23h 45mFrontier
Deal found 3/27$240
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/124:57 pmONT - PHL
1 stop9h 53mDelta
Sat 8/235:55 amPHL - ONT
1 stop8h 12mDelta
Deal found 3/25$345
This American Airlines deal was found by Cheapflights users on 3/26. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/1710:40 pmONT - PHL
1 stop9h 56mAmerican Airlines
Sat 8/231:26 pmPHL - ONT
1 stop7h 06mAmerican Airlines
Deal found 3/26$347
This United Airlines deal was found by Cheapflights users on 3/26. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/246:39 pmONT - PHL
2 stops12h 59mUnited Airlines
Sat 4/266:15 amPHL - ONT
2 stops9h 23mUnited Airlines
Deal found 3/26$355
This Southwest deal was found by Cheapflights users on 3/26. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/66:25 amONT - PHL
1 stop10h 05mSouthwest
Tue 6/104:45 pmPHL - ONT
2 stops9h 25mSouthwest
Deal found 3/26$385
This Alaska Airlines deal was found by Cheapflights users on 3/27. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/134:05 pmONT - PHL
1 stop10h 56mAlaska Airlines
Thu 10/167:25 amPHL - ONT
1 stop10h 47mAlaska Airlines
Deal found 3/27$416
This Hawaiian Airlines deal was found by Cheapflights users on 3/27. 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 Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/83:00 pmONT - PHL
1 stop11h 45mHawaiian Airlines
Fri 9/197:05 amPHL - ONT
1 stop10h 01mHawaiian Airlines
Deal found 3/27$476
This American Airlines deal was found by Cheapflights users on 3/26. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/311:59 pmONT - SBY
2 stops11h 36mAmerican Airlines
Mon 10/61:58 pmSBY - ONT
1 stop9h 02mAmerican Airlines
Deal found 3/26$652

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 28, 2025.
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

Wed 4/30

10:44 am-6:47 am

1 stop17h 03m

Philadelphia

Sun 5/4

6:54 pm-3:39 pm

1 stop23h 45m

$240

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Mon 5/12

4:57 pm-5:50 am

1 stop9h 53m

Philadelphia

Sat 8/23

5:55 am-11:07 am

1 stop8h 12m

$345

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Sat 5/17

10:40 pm-11:36 am

1 stop9h 56m

Philadelphia

Sat 8/23

1:26 pm-5:32 pm

1 stop7h 06m

$347

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Thu 4/24

6:39 pm-10:38 am

2 stops12h 59m

Philadelphia

Sat 4/26

6:15 am-12:38 pm

2 stops9h 23m

$355

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Fri 6/6

6:25 am-7:30 pm

1 stop10h 05m

Philadelphia

Tue 6/10

4:45 pm-11:10 pm

2 stops9h 25m

$385

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Mon 9/8

3:00 pm-5:45 am

1 stop11h 45m

Philadelphia

Fri 9/19

7:05 am-2:06 pm

1 stop10h 01m

$476

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Mon 9/8

3:00 pm-5:45 am

1 stop11h 45m

Philadelphia

Fri 9/12

6:58 pm-6:23 pm

1 stop26h 25m

$490

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Wed 4/30

10:44 am-5:52 am

1 stop16h 08m

$108

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Thu 4/24

4:25 pm-6:47 am

1 stop11h 22m

$125

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Tue 8/19

10:59 pm-9:29 am

1 stop7h 30m

$174

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/26

Showing 1-10 of 14 results
1
2

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

Rainfall in Delaware by month

Plan your trip to Delaware by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Delaware ranges from 2.9 - 4.3 inches per month. July is typically the wettest month, when rainfall can reach 4.3 in. February is typically the driest time to visit Delaware when rainfall is around 2.9 in.

Temperature in Delaware by month

Plan your trip to Delaware by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Delaware, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 77.0 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 32.0 F).

Reviews of airlines servicing Delaware

Get insights into the airlines that provide service to Delaware. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Delaware. Reviews last updated March 28, 2025.
See what other customers who have flown with Southwest, Alaska Airlines and Delta from Ontario to Delaware have to say. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.1
Very good
4,273 reviews

Overall

8.1

Boarding

8.2

Entertainment

7.6

Comfort

8.1

Crew

8.6

Food

7.1

Reviews

1 / 20
10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.
Southwest
8.1
Very good
4,273 reviews
Southwest
8.1
Very good
4,273 reviews

Overall

8.1

Boarding

8.2

Entertainment

7.6

Comfort

8.1

Crew

8.6

Food

7.1

Reviews

1 / 20
10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.
Alaska Airlines
8.0
Very good
9,798 reviews
Southwest
8.1
Very good
4,273 reviews

Overall

8.1

Boarding

8.2

Entertainment

7.6

Comfort

8.1

Crew

8.6

Food

7.1

Reviews

1 / 20
10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.
Delta
8.0
Very good
7,896 reviews
Southwest
8.1
Very good
4,273 reviews

Overall

8.1

Boarding

8.2

Entertainment

7.6

Comfort

8.1

Crew

8.6

Food

7.1

Reviews

1 / 20
10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.
Hawaiian Airlines
7.9
Good
2,335 reviews
Southwest
8.1
Very good
4,273 reviews

Overall

8.1

Boarding

8.2

Entertainment

7.6

Comfort

8.1

Crew

8.6

Food

7.1

Reviews

1 / 20
10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.
United Airlines
7.4
Good
8,603 reviews
Southwest
8.1
Very good
4,273 reviews

Overall

8.1

Boarding

8.2

Entertainment

7.6

Comfort

8.1

Crew

8.6

Food

7.1

Reviews

1 / 20
10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.

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.

  • What are the cheapest airlines to fly from Ontario to Delaware one-way?

    The cheapest airlines for a one-way flight from Ontario to Delaware are Frontier ($125), Delta ($174), and American Airlines ($209).

  • 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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