How long is the flight from Ontario to Delaware?

For as low as $164, Frontier can have you in Delaware from Ontario in 18h 56m. The distance between Ontario and Delaware is about 2349 mi.

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 ($103), Delta ($159), and Alaska Airlines ($168).

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.

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).

How far in advance should I book a flight from Ontario to Delaware?

When searching for a good deal, it’s best to be prepared for potential fluctuations in price. We recommend booking at least 41 days in advance, which can save you up to 61% on flights from Ontario to Delaware compared to booking the week you need them. Waiting 41 days out may not be for everyone, so we have options available for flights within the next two weeks, with the lowest price starting at $335. For sooner than that we have options available in the next 3 days from $507.

What is the cheapest month to fly from Ontario to Delaware?

The best pricing can be found in the month of August. Prices to Delaware from Ontario average $369. You can even find prices in August for less than $369, as users have found deals to Delaware from as low as $177. The month of December appears to be one of the more expensive times to travel to Delaware from Ontario. Flying in the targeted month can save you up to 19%.

What is the cheapest time of day to fly from ONT to DE?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Ontario to Delaware as you normally would.

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.

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.

$97+ Cheap Flights from Ontario to Delaware

Home Search by date Vacation packages Hotels Flight deals Car rental Travel tips & news

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

Round-trip from	$164 (Mytrip)
One-way from	$97 (CheapOair)
Popular in	December
Cheapest in	August
Average price	$307

From Ontario to Delaware

Search Deals

One-way flight from Ontario to Delaware

Search Deals

Highest demand for flights based on searches. 9% potential increase in price ($39 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 1% potential price decrease ($7 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in September 2025

Search Deals

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 September 15, 2025.

Thu 10/28:59 pmONT - PHL

1 stop24h 58mFrontier

Sat 10/116:42 amPHL - ONT

1 stop20h 08mFrontier

Deal found 9/14

$164

Thu 10/306:53 amONT - PHL

1 stop18h 56mFrontier

Sun 11/28:00 amPHL - ONT

1 stop10h 22mFrontier

Deal found 9/14

$165

Thu 11/612:05 pmONT - PHL

1 stop13h 44mFrontier

Thu 11/136:19 amPHL - ONT

1 stop7h 51mFrontier

Deal found 9/15

$174

Fri 10/248:34 amONT - PHL

1 stop14h 07mFrontier

Thu 10/306:19 amPHL - ONT

1 stop7h 51mFrontier

Deal found 9/15

$175

Wed 9/248:59 pmONT - PHL

1 stop24h 58mFrontier

Thu 10/26:45 amPHL - ONT

1 stop28h 08mFrontier

Deal found 9/14

$179

Wed 10/18:59 pmONT - PHL

1 stop24h 58mFrontier

Wed 10/88:15 amPHL - ONT

1 stop26h 34mFrontier

Deal found 9/15

$185

Thu 10/94:17 pmONT - PHL

1 stop30h 24mFrontier

Sun 10/1211:30 amPHL - ONT

1 stop23h 19mFrontier

Deal found 9/14

$186

Thu 9/258:59 pmONT - PHL

1 stop24h 58mFrontier

Sat 9/276:45 amPHL - ONT

1 stop27h 38mFrontier

Deal found 9/15

$194

Fri 11/74:05 pmONT - PHL

1 stop9h 44mFrontier

Mon 11/106:19 amPHL - ONT

1 stop20h 31mFrontier

Deal found 9/14

$198

Sat 11/112:05 pmONT - PHL

2 stops18h 08mFrontier

Fri 11/146:19 amPHL - ONT

1 stop7h 51mFrontier

Deal found 9/15

$200

Sun 9/287:15 pmONT - PHL

1 stop18h 17mFrontier

Thu 10/26:45 amPHL - ONT

1 stop28h 08mFrontier

Deal found 9/15

$202

Best flights from Ontario to Delaware
Discover carefully curated flight deals from Ontario to Delaware that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 15, 2025.

Wed 11/126:53 amONT - PHL

1 stop18h 56mFrontier

Sat 11/156:19 amPHL - ONT

1 stop20h 31mFrontier

Deal found 9/15

$164

Wed 12/241:15 pmONT - PHL

1 stop7h 04mDelta

Wed 12/316:00 amPHL - ONT

1 stop7h 40mDelta

Deal found 9/15

$317

Thu 10/306:53 amONT - PHL

1 stop18h 56mMultiple Airlines

Tue 11/47:02 amPHL - ONT

1 stop11h 15mMultiple Airlines

Deal found 9/15

$319

Fri 12/56:00 amONT - PHL

1 stop8h 54mAlaska Airlines

Mon 12/87:06 amPHL - ONT

1 stop11h 15mAlaska Airlines

Deal found 9/14

$364

Thu 10/306:53 amONT - PHL

1 stop18h 56mFrontier

Tue 11/45:35 pmPHL - ONT

2 stops33h 15mFrontier

Deal found 9/15

$210

Thu 10/2310:30 amONT - PHL

1 stop15h 49mFrontier

Mon 10/276:42 amPHL - ONT

1 stop20h 08mFrontier

Deal found 9/15

$247

Wed 10/1510:00 pmONT - PHL

1 stop8h 30mDelta

Tue 10/217:05 amPHL - ONT

1 stop8h 09mDelta

Deal found 9/14

$317

Wed 10/297:35 amONT - PHL

2 stops13h 14mDelta

Wed 11/56:00 amPHL - ONT

2 stops14h 10mDelta

Deal found 9/14

$327

Sat 10/1811:36 amONT - PHL

1 stop7h 37mDelta

Thu 10/237:05 amPHL - ONT

1 stop8h 11mDelta

Deal found 9/14

$337

Tue 11/256:00 amONT - PHL

1 stop8h 37mDelta

Tue 12/27:05 amPHL - ONT

1 stop8h 17mDelta

Deal found 9/15

$377

Last-minute flights from Ontario to Delaware
Discover last-minute flight deals from Ontario to Delaware. Data last updated September 15, 2025 and is based on user searches.

Wed 9/248:59 pmONT - PHL

1 stop24h 58mFrontier

Thu 10/26:45 amPHL - ONT

1 stop28h 08mFrontier

Deal found 9/14

$179

Thu 9/258:59 pmONT - PHL

1 stop24h 58mFrontier

Sat 9/276:45 amPHL - ONT

1 stop27h 38mFrontier

Deal found 9/15

$194

Sun 9/287:15 pmONT - PHL

1 stop18h 17mFrontier

Thu 10/26:45 amPHL - ONT

1 stop28h 08mFrontier

Deal found 9/15

$202

Wed 10/18:59 pmONT - PHL

1 stop24h 58mFrontier

Wed 10/88:15 amPHL - ONT

1 stop26h 34mFrontier

Deal found 9/15

$185

Wed 10/18:59 pmONT - PHL

1 stop24h 58mFrontier

Sun 10/58:10 amPHL - ONT

1 stop13h 05mFrontier

Deal found 9/14

$198

Thu 10/28:59 pmONT - PHL

1 stop24h 58mFrontier

Sat 10/116:42 amPHL - ONT

1 stop20h 08mFrontier

Deal found 9/14

$164

Thu 10/94:17 pmONT - PHL

1 stop30h 24mFrontier

Sun 10/1211:30 amPHL - ONT

1 stop23h 19mFrontier

Deal found 9/14

$186

Fri 10/248:34 amONT - PHL

1 stop14h 07mFrontier

Thu 10/306:19 amPHL - ONT

1 stop7h 51mFrontier

Deal found 9/15

$175

Thu 10/306:53 amONT - PHL

1 stop18h 56mFrontier

Sun 11/28:00 amPHL - ONT

1 stop10h 22mFrontier

Deal found 9/14

$165

One-way flights from Ontario to Delaware
Search for one-way flight options from Ontario to Delaware. Find affordable one-way fares based on user searches. Data last updated September 15, 2025.

Fri 10/314:05 pmONT - PHL

1 stop9h 44mFrontier

Deal found 9/14

$97

Wed 9/248:59 pmONT - PHL

1 stop24h 58mFrontier

Deal found 9/14

$103

Fri 12/1211:52 amONT - PHL

1 stop13h 55mFrontier

Deal found 9/13

$107

Tue 9/238:59 pmONT - PHL

1 stop23h 44mFrontier

Deal found 9/15

$122

Wed 10/86:53 amONT - PHL

2 stops25h 34mFrontier

Deal found 9/15

$132

Mon 12/1511:52 amONT - PHL

1 stop13h 55mFrontier

Deal found 9/14

$133

Thu 10/27:30 pmONT - PHL

2 stops13h 08mFrontier

Deal found 9/14

$139

Tue 9/308:59 pmONT - PHL

1 stop23h 44mFrontier

Deal found 9/14

$141

Mon 9/298:59 pmONT - PHL

2 stops37h 51mFrontier

Deal found 9/14

$148

Wed 10/156:53 amONT - PHL

1 stop19h 26mFrontier

Deal found 9/14

$150

Fri 10/106:00 amONT - SBY

2 stops13h 11mAlaska Airlines

Deal found 9/15

$607

Fly from

Fly to

Route

Depart

Return

Price

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Wed 11/12

6:53 am-4:49 am

1 stop18h 56m

Philadelphia

Sat 11/15

6:19 am-11:50 pm

1 stop20h 31m

$164

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Thu 10/30

6:53 am-4:49 am

1 stop18h 56m

Philadelphia

Tue 11/4

5:35 pm-11:50 pm

2 stops33h 15m

$210

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Thu 10/23

10:30 am-5:19 am

1 stop15h 49m

Philadelphia

Mon 10/27

6:42 am-11:50 pm

1 stop20h 08m

$247

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Wed 12/24

1:15 pm-11:19 pm

1 stop7h 04m

Philadelphia

Wed 12/31

6:00 am-10:40 am

1 stop7h 40m

$317

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Wed 10/15

10:00 pm-9:30 am

1 stop8h 30m

Philadelphia

Tue 10/21

7:05 am-12:14 pm

1 stop8h 09m

$317

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Thu 10/30

6:53 am-4:49 am

1 stop18h 56m

Philadelphia

Tue 11/4

7:02 am-3:17 pm

1 stop11h 15m

$319

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Wed 10/29

7:35 am-11:49 pm

2 stops13h 14m

Philadelphia

Wed 11/5

6:00 am-5:10 pm

2 stops14h 10m

$327

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Sat 10/18

11:36 am-10:13 pm

1 stop7h 37m

Philadelphia

Thu 10/23

7:05 am-12:16 pm

1 stop8h 11m

$337

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Fri 12/5

6:00 am-5:54 pm

1 stop8h 54m

Philadelphia

Mon 12/8

7:06 am-3:21 pm

1 stop11h 15m

$364

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Tue 11/25

6:00 am-5:37 pm

1 stop8h 37m

Philadelphia

Tue 12/2

7:05 am-12:22 pm

1 stop8h 17m

$377

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/15

Showing 1-10 of 22 results

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

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 $164, Frontier can have you in Delaware from Ontario in 18h 56m. The distance between Ontario and Delaware is about 2349 mi.
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 ($103), Delta ($159), and Alaska Airlines ($168).
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

Alternative routes for Ontario to Delaware

Los Angeles to John F Kennedy Intl flights

San Francisco to John F Kennedy Intl flights

Los Angeles to Seattle flights

Los Angeles to Newark flights

San Francisco to Las Vegas flights

Los Angeles to Honolulu flights

Los Angeles to Dallas/Fort Worth flights

Los Angeles to LaGuardia flights

San Francisco to Newark flights

Los Angeles to O'Hare Intl flights

San Francisco to Los Angeles flights

Los Angeles to San Francisco flights

Los Angeles to Las Vegas flights

Ontario to Seattle flights

Los Angeles to Boston flights

San Francisco to Honolulu flights

San Francisco to O'Hare Intl flights

Santa Ana to Las Vegas flights

Ontario to John F Kennedy Intl flights

San Francisco to LaGuardia flights

San Francisco to Seattle flights

San Francisco to Santa Ana flights

San Francisco to Ontario flights

San Francisco to Dallas/Fort Worth flights

Ontario to San Francisco flights

Los Angeles to Miami flights

Santa Ana to San Francisco flights

Los Angeles to Orlando flights

Oakland to Las Vegas flights

Burbank to Las Vegas flights

Los Angeles to San Jose flights

San Francisco to Boston flights

Santa Ana to Seattle flights

Los Angeles to Reagan-National flights

San Jose to Las Vegas flights

Los Angeles to Dulles Intl flights

Los Angeles to Hobby flights

Burbank to Newark flights

San Jose to Seattle flights

San Diego to John F Kennedy Intl flights

Los Angeles to Portland flights

San Jose to Los Angeles flights

Ontario to O'Hare Intl flights

Los Angeles to Austin flights

San Francisco to Denver flights

Ontario to Newark flights

Los Angeles to Denver flights

Santa Ana to Newark flights

Los Angeles to Kahului flights

San Diego to Seattle 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.

$97+ 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 10/31. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Ontario to Delaware with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

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 September 15, 2025.

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Find flight deals from Ontario to Delaware

Cheapest flights from Ontario to DelawareExplore 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 September 15, 2025.

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 September 15, 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from Ontario to Delaware that are best for you.

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.

Cheapflights Insights

Everything you need to know about your flight from Ontario to Delaware

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?

How long is the flight from Ontario to Delaware?

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

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

How can I find direct flights from Ontario to Delaware?

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

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.

100% Free

Book with Flexibility

Travel Smart

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 September 15, 2025.