HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Delaware

$55+ 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 12/4. Fares are subject to change and may not be available on all flights or dates of travel.
STL — ILG
Dec 3 — Dec 101
Wed 12/3
Wed 12/10
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from St. Louis 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 St. Louis to Delaware

Keep the following information in mind while searching for St. Louis to Delaware flight deals. Data was last updated November 3, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$120
(CheapOair)

One-way from

$55
(Frontier)

Popular in

March

Cheapest in

August

Average price

$398
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. 5% potential increase in price ($21 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($5 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in November 2025
Search Deals

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 November 3, 2025.

This Frontier deal was found by Cheapflights users on 11/2. 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 12/43:30 pmSTL - PHL
1 stop8h 10mFrontier
Sun 12/710:00 pmPHL - STL
1 stop11h 59mFrontier
Deal found 11/2$124
This Booking.com deal was found by Cheapflights users on 11/2. 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.
Wed 12/103:30 pmSTL - PHL
1 stop17h 30mFrontier
Sun 12/146:00 amPHL - STL
1 stop27h 59mFrontier
Deal found 11/2$125
This Frontier deal was found by Cheapflights users on 11/2. 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 11/194:35 pmPHL - STL
1 stop7h 26mFrontier
Deal found 11/2$128
This Frontier deal was found by Cheapflights users on 11/2. 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 12/57:43 pmSTL - PHL
1 stop8h 48mFrontier
Sun 12/710:00 pmPHL - STL
1 stop11h 59mFrontier
Deal found 11/2$138
This Frontier deal was found by Cheapflights users on 11/1. 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 12/127:43 pmSTL - PHL
1 stop8h 48mFrontier
Mon 12/152:06 pmPHL - STL
1 stop9h 27mFrontier
Deal found 11/1$142
This Frontier deal was found by Cheapflights users on 11/1. 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 11/127:45 pmSTL - PHL
1 stop8h 04mFrontier
Sun 11/165:50 amPHL - STL
1 stop5h 22mFrontier
Deal found 11/1$168
This Trip.com deal was found by Cheapflights users on 10/31. 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.
Thu 11/204:13 pmSTL - PHL
1 stop18h 14mMultiple Airlines
Fri 11/218:54 pmPHL - STL
1 stop13h 03mMultiple Airlines
Deal found 10/31$172
This Kiwi.com deal was found by Cheapflights users on 11/2. 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.
Fri 12/510:42 amSTL - PHL
2 stops23h 35mMultiple Airlines
Sun 12/710:00 pmPHL - STL
1 stop11h 59mMultiple Airlines
Deal found 11/2$200
This Frontier deal was found by Cheapflights users on 11/2. 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 11/247:43 pmSTL - PHL
1 stop8h 02mFrontier
Sat 12/610:00 pmPHL - STL
1 stop11h 59mFrontier
Deal found 11/2$208
This American Airlines deal was found by Cheapflights users on 11/3. 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 11/1810:44 amSTL - SBY
1 stop6h 49mAmerican Airlines
Sun 12/287:55 amSBY - STL
1 stop5h 37mAmerican Airlines
Deal found 11/3$663
This American Airlines deal was found by Cheapflights users on 11/3. 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 11/1810:44 amSTL - SBY
1 stop6h 49mAmerican Airlines
Mon 12/16:30 amSBY - STL
2 stops10h 46mAmerican Airlines
Deal found 11/3$835
This American Airlines deal was found by Cheapflights users on 11/3. 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 11/1810:44 amSTL - SBY
1 stop6h 49mAmerican Airlines
Sun 11/306:30 amSBY - STL
1 stop4h 52mAmerican Airlines
Deal found 11/3$872

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 November 3, 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

Sun 11/16

7:45 pm-4:49 am

1 stop8h 04m

Philadelphia

Wed 11/19

4:35 pm-11:01 pm

1 stop7h 26m

$128

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Wed 11/12

7:45 pm-4:49 am

1 stop8h 04m

Philadelphia

Sun 11/16

5:50 am-10:12 am

1 stop5h 22m

$168

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Thu 11/20

4:13 pm-11:27 am

1 stop18h 14m

Philadelphia

Fri 11/21

8:54 pm-8:57 am

1 stop13h 03m

$172

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Fri 11/14

11:05 am-6:49 pm

1 stop6h 44m

Philadelphia

Sun 11/16

5:05 am-1:17 pm

1 stop9h 12m

$224

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Sat 12/13

3:30 pm-12:40 am

1 stop8h 10m

Philadelphia

Mon 12/15

2:06 pm-10:33 pm

1 stop9h 27m

$228

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Fri 1/2

7:43 pm-5:31 am

1 stop8h 48m

Philadelphia

Sat 1/10

8:00 pm-10:33 pm

1 stop27h 33m

$240

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Thu 11/6

11:07 am-6:44 pm

1 stop6h 37m

Philadelphia

Mon 11/10

6:19 am-9:07 am

1 stop27h 48m

$252

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Mon 12/22

5:30 am-8:47 am

Nonstop2h 17m

Philadelphia

Wed 12/24

6:00 am-2:09 pm

1 stop9h 09m

$288

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Sat 11/22

9:52 am-11:25 pm

1 stop12h 33m

Philadelphia

Tue 11/25

6:00 am-2:29 pm

1 stop9h 29m

$288

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Wed 12/17

8:13 am-4:39 pm

1 stop7h 26m

Philadelphia

Tue 12/30

7:00 pm-8:51 pm

Nonstop2h 51m

$362

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/3

Showing 1-10 of 24 results
1
2
3

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 5h 26m. St. Louis and Delaware are separated by a distance of 802 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

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 St. Louis to Delaware

See prices for flight routes from nearby airports that may be better suited for you.
St. Louis to Las Vegas flights
St. Louis to LaGuardia flights
St. Louis to John F Kennedy Intl flights
Kansas City to John F Kennedy Intl flights
Kansas City to LaGuardia flights
St. Louis to Newark flights
St. Louis to Orlando flights
Kansas City to Las Vegas flights
Kansas City to Denver flights
Kansas City to Newark flights
St. Louis to Denver flights
Kansas City to Sky Harbor Intl flights
St. Louis to Hobby flights
Kansas City to O'Hare Intl flights
St. Louis to Atlanta flights
St. Louis to Sky Harbor Intl flights
Kansas City to Atlanta flights
Kansas City to Orlando flights
Kansas City to Seattle flights
St. Louis to Miami flights
St. Louis to Los Angeles flights
St. Louis to Dallas/Fort Worth flights
Kansas City to Los Angeles flights
Kansas City to Dulles Intl flights
Kansas City to Dallas/Fort Worth flights
St. Louis to George Bush Intcntl flights
Kansas City to Miami flights
St. Louis to Seattle flights
Kansas City to Hobby flights
St. Louis to O'Hare Intl flights
Kansas City to Boston flights
St. Louis to Dulles Intl flights
St. Louis to San Francisco flights
St. Louis to Fort Lauderdale flights
Kansas City to Reagan-National flights
Kansas City to George Bush Intcntl flights
Kansas City to Tampa flights
St. Louis to Honolulu flights
St. Louis to Boston flights
St. Louis to Salt Lake City flights
Kansas City to Baltimore flights
St. Louis to Detroit flights
St. Louis to New Orleans flights
St. Louis to San Diego flights
St. Louis to Tampa flights
St. Louis to Baltimore flights
St. Louis to Love Field flights
Kansas City to Honolulu flights
Kansas City to Fort Lauderdale flights
Kansas City to Midway 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.