How long is the flight from St. Louis to Delaware?

Departing from St. Louis to Delaware will take you 14h 26m. St. Louis and Delaware are separated by a distance of 811 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

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).

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

When flying from St. Louis to Delaware, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

What airport do you fly from for flights from St. Louis to Delaware?

Located just 12.7 mi from the city center, Lambert-St Louis (STL) is the airport most travelers will use when flying to Delaware from St. Louis.

Can I find deals for flights from St. Louis to Delaware that include hotel bookings?

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

How can I find direct flights from St. Louis to Delaware?

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

Can I find deals for business class flights from St. Louis to Delaware?

Yes. Cheapflights offers flight deals from St. Louis 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.

$67+ Flights from St. Louis to Delaware

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Cheap flight deals from St. Louis to Delaware

Cheapest flights from St. Louis to Delaware
Explore the most affordable flight options available from St. Louis to Delaware. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 18, 2025.

Wed 12/315:19 pmSTL - PHL

1 stop11h 21mFrontier

Sun 1/45:10 amPHL - STL

1 stop5h 30mFrontier

Deal found 12/16

$233

Mon 12/227:43 pmSTL - PHL

1 stop8h 48mFrontier

Fri 1/95:05 amPHL - STL

1 stop10h 43mFrontier

Deal found 12/17

$248

Sat 12/2010:10 pmSTL - PHL

1 stop30h 30mFrontier

Thu 1/13:46 pmPHL - STL

1 stop7h 47mFrontier

Deal found 12/17

$264

Sun 12/2110:10 pmSTL - PHL

1 stop30h 30mFrontier

Tue 12/237:10 amPHL - STL

1 stop15h 15mFrontier

Deal found 12/17

$327

Fri 12/198:37 pmSTL - PHL

1 stop12h 54mFrontier

Sun 12/2110:00 pmPHL - STL

1 stop12h 45mFrontier

Deal found 12/16

$332

Mon 12/224:27 pmSTL - PHL

1 stop7h 13mFrontier

Mon 12/291:56 pmPHL - STL

1 stop9h 37mFrontier

Deal found 12/15

$343

Sat 12/2010:10 pmSTL - PHL

1 stop30h 30mFrontier

Mon 12/2210:00 pmPHL - STL

1 stop25h 33mFrontier

Deal found 12/17

$393

Mon 12/224:27 pmSTL - PHL

1 stop7h 13mFrontier

Wed 12/247:10 amPHL - STL

1 stop10h 14mFrontier

Deal found 12/16

$397

Sat 12/204:27 pmSTL - PHL

1 stop7h 13mFrontier

Sun 12/285:10 amPHL - STL

1 stop5h 30mFrontier

Deal found 12/17

$431

Mon 12/224:27 pmSTL - PHL

1 stop7h 13mFrontier

Thu 12/258:36 pmPHL - STL

1 stop14h 26mFrontier

Deal found 12/17

$473

Thu 12/255:00 amSTL - SBY

1 stop7h 15mAmerican Airlines

Sun 12/281:51 pmSBY - STL

1 stop6h 39mAmerican Airlines

Deal found 12/17

$583

Best flights from St. Louis to Delaware
Discover carefully curated flight deals from St. Louis to Delaware that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 18, 2025.

Mon 1/125:11 pmSTL - PHL

1 stop23h 32mMultiple Airlines

Thu 1/158:43 pmPHL - STL

1 stop12h 11mMultiple Airlines

Deal found 12/16

$137

Wed 1/75:11 pmSTL - PHL

1 stop14h 26mFrontier

Wed 1/144:08 pmPHL - STL

1 stop7h 26mFrontier

Deal found 12/16

$139

Sat 2/216:00 amSTL - PHL

1 stop10h 25mAmerican Airlines

Sat 2/219:20 pmPHL - STL

Nonstop2h 42mAmerican Airlines

Deal found 12/16

$245

Thu 1/225:42 pmSTL - PHL

1 stop15h 17mFrontier

Mon 1/263:54 pmPHL - STL

1 stop8h 39mFrontier

Deal found 12/15

$169

Mon 1/57:43 pmSTL - PHL

2 stops28h 08mMultiple Airlines

Thu 1/88:43 pmPHL - STL

1 stop12h 07mMultiple Airlines

Deal found 12/16

$202

Fri 1/2311:18 amSTL - PHL

1 stop10h 14mFrontier

Mon 1/263:54 pmPHL - STL

1 stop8h 39mFrontier

Deal found 12/15

$197

Mon 1/57:43 pmSTL - PHL

1 stop8h 48mFrontier

Fri 1/97:20 pmPHL - STL

1 stop28h 13mFrontier

Deal found 12/17

$197

Thu 1/159:50 amSTL - PHL

2 stops7h 12mMultiple Airlines

Mon 1/196:33 pmPHL - STL

1 stop30h 00mMultiple Airlines

Deal found 12/17

$242

Sat 2/219:41 amSTL - PHL

1 stop6h 32mFrontier

Sat 2/216:13 pmPHL - STL

1 stop6h 46mFrontier

Deal found 12/16

$225

Sat 12/2010:10 pmSTL - PHL

1 stop30h 30mFrontier

Thu 1/13:46 pmPHL - STL

1 stop7h 47mFrontier

Deal found 12/17

$264

Fri 2/279:38 pmSTL - PHL

1 stop12h 01mFrontier

Sun 3/810:38 pmPHL - STL

1 stop9h 29mFrontier

Deal found 12/16

$266

Thu 6/45:30 amSTL - SBY

1 stop15h 28mAmerican Airlines

Tue 6/96:01 pmSBY - STL

1 stop14h 58mAmerican Airlines

Deal found 12/17

$620

Last-minute flights from St. Louis to Delaware
Discover last-minute flight deals from St. Louis to Delaware. Data last updated December 18, 2025 and is based on user searches.

Thu 12/255:00 amSTL - SBY

1 stop7h 15mAmerican Airlines

Sun 12/281:51 pmSBY - STL

1 stop6h 39mAmerican Airlines

Deal found 12/17

$583

Mon 1/57:43 pmSTL - PHL

1 stop8h 48mFrontier

Thu 1/83:56 pmPHL - STL

1 stop7h 37mFrontier

Deal found 12/17

$162

Wed 1/75:11 pmSTL - PHL

1 stop14h 26mFrontier

Wed 1/144:08 pmPHL - STL

1 stop7h 26mFrontier

Deal found 12/16

$139

Wed 1/75:11 pmSTL - PHL

2 stops14h 36mMultiple Airlines

Wed 1/144:08 pmPHL - STL

1 stop7h 26mMultiple Airlines

Deal found 12/16

$164

Mon 1/125:11 pmSTL - PHL

1 stop23h 32mMultiple Airlines

Thu 1/158:43 pmPHL - STL

1 stop12h 11mMultiple Airlines

Deal found 12/16

$137

Wed 1/148:32 pmSTL - PHL

1 stop13h 42mMultiple Airlines

Mon 1/198:43 pmPHL - STL

1 stop27h 50mMultiple Airlines

Deal found 12/16

$188

Thu 1/225:42 pmSTL - PHL

1 stop15h 17mFrontier

Mon 1/263:54 pmPHL - STL

1 stop8h 39mFrontier

Deal found 12/15

$169

Tue 1/275:42 pmSTL - PHL

1 stop15h 55mMultiple Airlines

Mon 2/28:43 pmPHL - STL

1 stop27h 50mMultiple Airlines

Deal found 12/17

$130

Tue 1/275:42 pmSTL - PHL

1 stop15h 55mFrontier

Sun 2/110:45 pmPHL - STL

1 stop25h 48mFrontier

Deal found 12/17

$142

Tue 1/275:42 pmSTL - PHL

1 stop15h 55mMultiple Airlines

Sun 2/18:20 amPHL - STL

2 stops23h 31mMultiple Airlines

Deal found 12/17

$174

One-way flights from St. Louis to Delaware
Search for one-way flight options from St. Louis to Delaware. Find affordable one-way fares based on user searches. Data last updated December 18, 2025.

Tue 1/275:42 pmSTL - PHL

1 stop15h 55mFrontier

Deal found 12/16

$67

Tue 1/135:11 pmSTL - PHL

1 stop23h 32mFrontier

Deal found 12/17

$68

Mon 1/198:32 pmSTL - PHL

1 stop27h 10mFrontier

Deal found 12/17

$69

Wed 2/183:49 pmSTL - PHL

1 stop23h 54mFrontier

Deal found 12/17

$75

Sun 1/255:42 pmSTL - PHL

1 stop27h 50mFrontier

Deal found 12/16

$76

Wed 1/148:32 pmSTL - PHL

1 stop21h 14mFrontier

Deal found 12/17

$80

Sat 2/149:46 amSTL - PHL

1 stop9h 03mFrontier

Deal found 12/17

$81

Tue 2/173:49 pmSTL - PHL

1 stop19h 50mFrontier

Deal found 12/15

$87

Fri 1/168:32 pmSTL - PHL

1 stop13h 14mFrontier

Deal found 12/16

$88

Wed 1/148:32 pmSTL - PHL

2 stops19h 17mMultiple Airlines

Deal found 12/17

$90

Tue 1/135:11 pmSTL - PHL

2 stops21h 37mMultiple Airlines

Deal found 12/17

$96

Mon 1/268:22 pmSTL - PHL

2 stops19h 39mMultiple Airlines

Deal found 12/16

$97

Find flight deals from St. Louis to Delaware

Most accurate provider	eDreams 3 stars
Most trusted provider	eDreams 3 stars
Round-trip from	$130 (Kiwi.com)
One-way from	$67 (Kiwi.com)
Popular in	November
Cheapest in	August
Average price	$463

Provider with most accurate pricing for Lambert-St Louis-Philadelphia flight deals.

Search Deals

Provider most trusted by Cheapflights users for Lambert-St Louis-Philadelphia flights.

Search Deals

From Lambert-St Louis to Delaware

Search Deals

One-way flight from Lambert-St Louis to Delaware

Search Deals

Highest demand for flights based on searches. 9% potential increase in price ($43 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 2% potential price decrease ($9 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in December 2025

Search Deals

Cheapflights Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Mon 1/12

5:11 pm-5:43 pm

1 stop23h 32m

Philadelphia

Thu 1/15

8:43 pm-7:54 am

1 stop12h 11m

$137

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Wed 1/7

5:11 pm-8:37 am

1 stop14h 26m

Philadelphia

Wed 1/14

4:08 pm-10:34 pm

1 stop7h 26m

$139

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Thu 1/22

5:42 pm-9:59 am

1 stop15h 17m

Philadelphia

Mon 1/26

3:54 pm-11:33 pm

1 stop8h 39m

$169

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Fri 1/23

11:18 am-10:32 pm

1 stop10h 14m

Philadelphia

Mon 1/26

3:54 pm-11:33 pm

1 stop8h 39m

$197

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Mon 1/5

7:43 pm-5:31 am

1 stop8h 48m

Philadelphia

Fri 1/9

7:20 pm-10:33 pm

1 stop28h 13m

$197

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Mon 1/5

7:43 pm-12:51 am

2 stops28h 08m

Philadelphia

Thu 1/8

8:43 pm-7:50 am

1 stop12h 07m

$202

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Sat 2/21

9:41 am-5:13 pm

1 stop6h 32m

Philadelphia

Sat 2/21

6:13 pm-11:59 pm

1 stop6h 46m

$225

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Thu 1/15

9:50 am-6:02 pm

2 stops7h 12m

Philadelphia

Mon 1/19

6:33 pm-11:33 pm

1 stop30h 00m

$242

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Sat 2/21

6:00 am-5:25 pm

1 stop10h 25m

Philadelphia

Sat 2/21

9:20 pm-11:02 pm

Nonstop2h 42m

$245

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Sat 12/20

10:10 pm-5:40 am

1 stop30h 30m

Philadelphia

Thu 1/1

3:46 pm-10:33 pm

1 stop7h 47m

$264

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/16

Showing 1-10 of 23 results

Best time to book a flight from St. Louis to Delaware

Have a flexible travel schedule? Discover the best time to fly to Delaware from St. Louis 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 St. Louis 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 St. Louis to Delaware?
Located just 12.7 mi from the city center, Lambert-St Louis (STL) is the airport most travelers will use when flying to Delaware from St. Louis.
How long is the flight from St. Louis to Delaware?
Departing from St. Louis to Delaware will take you 14h 26m. St. Louis and Delaware are separated by a distance of 811 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 St. Louis to Delaware that include hotel bookings?
Yes. In addition to deals on St. Louis to Delaware flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from St. Louis to Delaware?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from St. Louis to Delaware.
Can I find deals for business class flights from St. Louis to Delaware?
Yes. Cheapflights offers flight deals from St. Louis 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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$67+ Cheap flights from St. Louis (STL) 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 1/27. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from St. Louis to Delaware with Cheapflights

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Cheap flight deals from St. Louis to Delaware

Cheapest flights from St. Louis to DelawareExplore the most affordable flight options available from St. Louis to Delaware. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 18, 2025.

Explore the most affordable flight options available from St. Louis to Delaware. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 18, 2025.

Find flight deals from St. Louis to Delaware

Keep the following information in mind while searching for St. Louis to Delaware flight deals. Data was last updated December 18, 2025.

Most accurate provider

Most trusted provider

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Cheapflights Fare Finder

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

Best time to book a flight from St. Louis to Delaware

Have a flexible travel schedule? Discover the best time to fly to Delaware from St. Louis with our price prediction graph.

Cheapflights Insights

Everything you need to know about your flight from St. Louis to Delaware

Related info for your journey

Find useful and relevant information for your journey from St. Louis 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 St. Louis to Delaware?

How long is the flight from St. Louis to Delaware?

Can I find deals for flights from St. Louis to Delaware that include hotel bookings?

How can I find direct flights from St. Louis to Delaware?

Can I find deals for business class flights from St. Louis to Delaware?

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Cheapest flights from St. Louis to Delaware
Explore the most affordable flight options available from St. Louis to Delaware. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 18, 2025.