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Delaware

$83+ 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 10/10. Fares are subject to change and may not be available on all flights or dates of travel.
STL — ILG
Oct 16 — Oct 231
Thu 10/16
Thu 10/23
1 adult, Economy
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Cheap 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 September 16, 2025.

Round-trip from

$143
(Priceline)

One-way from

$83
(Frontier)

Popular in

March

Cheapest in

August

Average price

$353
From Lambert-St Louis to Delaware
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One-way flight from Lambert-St Louis to Delaware
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Highest demand for flights based on searches. 5% potential increase in price ($24 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($5 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Find 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 September 16, 2025.

This Priceline deal was found by Cheapflights users on 9/15. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/64:00 pmSTL - PHL
1 stop7h 59mFrontier
Thu 10/95:20 amPHL - STL
1 stop6h 17mFrontier
Deal found 9/15$143
This Priceline deal was found by Cheapflights users on 9/14. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/67:45 pmSTL - PHL
1 stop8h 04mFrontier
Sun 11/95:50 amPHL - STL
1 stop5h 22mFrontier
Deal found 9/14$153
This Frontier deal was found by Cheapflights users on 9/14. 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 9/254:00 pmSTL - PHL
1 stop7h 57mFrontier
Sun 9/285:15 amPHL - STL
1 stop10h 49mFrontier
Deal found 9/14$161
This Kiwi.com deal was found by Cheapflights users on 9/15. 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.
Thu 10/306:22 pmSTL - PHL
1 stop21h 04mFrontier
Thu 11/67:10 amPHL - STL
1 stop11h 17mFrontier
Deal found 9/15$162
This CheapOair deal was found by Cheapflights users on 9/14. 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.
Mon 10/139:06 pmSTL - PHL
1 stop18h 19mFrontier
Wed 10/155:53 pmPHL - STL
1 stop17h 44mFrontier
Deal found 9/14$163
This Frontier deal was found by Cheapflights users on 9/13. 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.
Sun 11/167:45 pmSTL - PHL
1 stop8h 04mFrontier
Wed 11/195:35 pmPHL - STL
1 stop6h 26mFrontier
Deal found 9/13$166
This CheapOair deal was found by Cheapflights users on 9/13. 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.
Mon 9/224:00 pmSTL - PHL
1 stop7h 57mFrontier
Sat 9/276:37 pmPHL - STL
1 stop21h 27mFrontier
Deal found 9/13$171
This Cheapflightsfares deal was found by Cheapflights users on 9/13. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/117:15 pmSTL - PHL
1 stop13h 17mSpirit Airlines
Sat 10/185:33 amPHL - STL
1 stop13h 37mSpirit Airlines
Deal found 9/13$177
This CheapOair deal was found by Cheapflights users on 9/13. 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.
Sun 9/2810:39 amSTL - PHL
1 stop28h 53mFrontier
Thu 10/26:45 amPHL - STL
1 stop27h 21mFrontier
Deal found 9/13$180
This Frontier deal was found by Cheapflights users on 9/14. 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.
Mon 9/224:00 pmSTL - PHL
1 stop7h 57mFrontier
Thu 9/255:15 amPHL - STL
1 stop10h 49mFrontier
Deal found 9/14$182
This CheapOair deal was found by Cheapflights users on 9/15. 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.
Fri 10/39:32 pmSTL - PHL
1 stop22h 24mFrontier
Sun 10/55:15 amPHL - STL
1 stop10h 49mFrontier
Deal found 9/15$185
This American Airlines deal was found by Cheapflights users on 9/15. 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.
Tue 9/302:11 pmSTL - SBY
1 stop5h 54mAmerican Airlines
Sat 10/46:00 amSBY - STL
1 stop4h 16mAmerican Airlines
Deal found 9/15$432

Cheapflights Fare Finder

 
Customize your flight search to find flights from St. Louis 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 September 16, 2025.
Use the filters below to find and compare flights from St. Louis to Delaware that are best for you.

Fly from

St. Louis

Fly to

Delaware

Route

Depart

Return

Price

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Fri 10/10

6:05 pm-1:07 am

1 stop6h 02m

Philadelphia

Sun 10/12

5:05 am-12:46 pm

1 stop8h 41m

$143

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Sat 10/11

7:15 pm-9:32 am

1 stop13h 17m

Philadelphia

Sat 10/18

5:33 am-6:10 pm

1 stop13h 37m

$177

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Mon 9/22

4:00 pm-12:57 am

1 stop7h 57m

Philadelphia

Sat 9/27

6:37 pm-3:04 pm

1 stop21h 27m

$179

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Thu 10/9

11:32 am-12:59 am

1 stop12h 27m

Philadelphia

Sun 10/12

5:05 am-12:46 pm

1 stop8h 41m

$195

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Thu 11/13

12:20 pm-9:13 pm

1 stop7h 53m

Philadelphia

Mon 11/17

1:19 pm-9:07 am

2 stops44h 48m

$238

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Thu 9/25

10:49 am-12:57 am

2 stops13h 08m

Philadelphia

Wed 10/1

2:45 pm-3:04 pm

1 stop25h 19m

$243

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Sat 10/11

7:15 pm-11:52 am

1 stop15h 37m

Philadelphia

Mon 10/20

6:42 am-9:07 am

1 stop27h 25m

$244

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Fri 9/26

1:57 pm-12:57 am

2 stops10h 00m

Philadelphia

Sun 9/28

5:15 am-3:04 pm

1 stop10h 49m

$255

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Thu 10/9

11:32 am-12:59 am

1 stop12h 27m

Philadelphia

Mon 10/13

5:05 am-8:21 pm

1 stop16h 16m

$257

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Fri 10/17

6:00 am-9:18 am

Nonstop2h 18m

Philadelphia

Mon 11/3

4:01 pm-5:44 pm

Nonstop2h 43m

$313

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/13

Showing 1-10 of 24 results
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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

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?

    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 6h 02m. 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.

  • What are the cheapest airlines to fly from St. Louis to Delaware one-way?

    For one-way options, check prices for Frontier. According to our data, you can fly for as low as $89. Users have also found prices from $93 and $96 on Spirit Airlines and Southwest, respectively.

  • 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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Alternative routes for St. Louis to Delaware

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