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 $95. Users have also found prices from $136 and $151 on Spirit Airlines and American Airlines, respectively.

How far in advance should I book a flight from St. Louis to Delaware?

Find a great deal and save up to 32% by booking at least 14 days prior to your desired departure date, rather than waiting until the week of travel. According to our data, there are a number of flights available from St. Louis to Delaware within the next two weeks, with the cheapest ticket starting at $170.

What is the cheapest month to fly from St. Louis to Delaware?

Our data shows that June tends to be the cheapest month to fly to Delaware from St. Louis. Users have commonly found prices around $331 for the month, but tickets can be as low as $68. Due to multiple factors, prepare for potentially higher prices in March.

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.

$95+ Flights from St. Louis to Delaware

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Cheap flight deals from St. Louis to Delaware

Most accurate provider	Mytrip 3 stars
Most trusted provider	Mytrip 3 stars
Round-trip from	$311 (American Airlines)
One-way from	$95 (Frontier)
Popular in	March
Cheapest in	June
Average price	$417

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

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

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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. 21% potential increase in price ($88 potential increase over avg. RT price).

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Cheapest flight prices on average. 3% potential price decrease ($10 potential savings vs. average RT price).

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Average for round-trip flights in April 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 April 30, 2025.

Wed 7/2311:45 amSTL - PHL

1 stop5h 40mSouthwest

Tue 7/295:30 amPHL - STL

2 stops8h 05mSouthwest

Deal found 4/29

$326

Sat 5/2410:10 amSTL - PHL

1 stop11h 33mMultiple Airlines

Sun 5/255:45 amPHL - STL

3 stops37h 56mMultiple Airlines

Deal found 4/29

$328

Wed 5/285:00 amSTL - PHL

1 stop4h 04mAmerican Airlines

Sat 5/3110:53 amPHL - STL

Nonstop2h 34mAmerican Airlines

Deal found 4/29

$330

Sat 7/127:29 pmSTL - PHL

1 stop8h 40mFrontier

Mon 7/144:32 pmPHL - STL

1 stop8h 15mFrontier

Deal found 4/28

$332

Fri 6/1311:28 amSTL - PHL

2 stops19h 20mSpirit Airlines

Sun 6/152:38 pmPHL - STL

2 stops28h 40mSpirit Airlines

Deal found 4/29

$341

Tue 7/86:40 amSTL - PHL

1 stop4h 05mDelta

Fri 7/116:00 amPHL - STL

1 stop4h 33mDelta

Deal found 4/28

$369

Tue 5/276:30 amSTL - PHL

1 stop6h 54mUnited Airlines

Tue 6/1710:35 amPHL - STL

2 stops11h 50mUnited Airlines

Deal found 4/29

$396

Tue 6/104:41 pmSTL - SBY

1 stop4h 17mAmerican Airlines

Sat 6/145:29 pmSBY - STL

1 stop7h 30mAmerican Airlines

Deal found 4/28

$402

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 April 30, 2025.

Wed 7/95:14 pmSTL - PHL

Nonstop2h 11mAmerican Airlines

Wed 7/234:25 pmPHL - STL

1 stop4h 54mAmerican Airlines

Deal found 4/27

$311

Wed 7/910:46 amSTL - PHL

1 stop5h 36mDelta

Wed 7/235:30 amPHL - STL

1 stop5h 11mDelta

Deal found 4/27

$321

Tue 6/245:25 amSTL - PHL

1 stop6h 25mSouthwest

Tue 7/85:30 amPHL - STL

2 stops8h 05mSouthwest

Deal found 4/28

$326

Sat 6/142:52 pmSTL - PHL

1 stop8h 17mFrontier

Sat 6/215:30 amPHL - STL

1 stop9h 37mFrontier

Deal found 4/29

$332

Thu 5/2910:10 amSTL - PHL

1 stop11h 33mMultiple Airlines

Mon 6/24:00 pmPHL - STL

2 stops27h 41mMultiple Airlines

Deal found 4/28

$335

Thu 6/196:12 pmSTL - PHL

1 stop16h 12mSpirit Airlines

Thu 7/37:05 amPHL - STL

1 stop10h 59mSpirit Airlines

Deal found 4/28

$336

Tue 5/275:00 amSTL - PHL

1 stop4h 37mUnited Airlines

Tue 6/1710:35 amPHL - STL

2 stops11h 50mUnited Airlines

Deal found 4/28

$396

Tue 6/104:41 pmSTL - SBY

1 stop4h 17mAmerican Airlines

Sat 6/145:29 pmSBY - STL

1 stop7h 30mAmerican Airlines

Deal found 4/28

$402

Thu 6/58:35 amSTL - PHL

2 stops8h 11mAlaska Airlines

Sun 6/88:15 amPHL - STL

2 stops13h 15mAlaska Airlines

Deal found 4/28

$14,754

Last-minute flights from St. Louis to Delaware
Discover last-minute flight deals from St. Louis to Delaware. Data last updated April 30, 2025 and is based on user searches.

Thu 5/16:10 pmSTL - PHL

1 stop13h 36mSpirit Airlines

Sat 5/39:30 amPHL - STL

2 stops32h 45mSpirit Airlines

Deal found 4/29

$615

Tue 5/66:00 amSTL - PHL

Nonstop2h 11mAmerican Airlines

Thu 5/87:14 pmPHL - STL

Nonstop2h 44mAmerican Airlines

Deal found 4/29

$485

Tue 5/66:25 amSTL - PHL

2 stops8h 30mSouthwest

Wed 5/75:25 amPHL - STL

1 stop9h 05mSouthwest

Deal found 4/28

$644

Tue 5/66:00 amSTL - PHL

2 stops9h 36mDelta

Thu 5/86:00 amPHL - STL

2 stops10h 00mDelta

Deal found 4/29

$1,454

Thu 5/89:50 amSTL - PHL

2 stops28h 12mMultiple Airlines

Mon 5/127:06 amPHL - STL

3 stops12h 35mMultiple Airlines

Deal found 4/28

$332

Thu 5/86:30 amSTL - PHL

1 stop4h 23mUnited Airlines

Mon 5/123:46 pmPHL - STL

2 stops19h 10mUnited Airlines

Deal found 4/29

$871

Tue 5/131:59 pmSTL - SBY

1 stop7h 03mAmerican Airlines

Sat 5/175:03 amSBY - STL

1 stop4h 15mAmerican Airlines

Deal found 4/28

$432

Sat 5/2410:10 amSTL - PHL

1 stop11h 33mMultiple Airlines

Sun 5/255:45 amPHL - STL

3 stops37h 56mMultiple Airlines

Deal found 4/29

$328

Sat 5/245:45 amSTL - PHL

2 stops9h 00mSouthwest

Sun 5/256:35 amPHL - STL

1 stop6h 35mSouthwest

Deal found 4/29

$345

Tue 5/276:30 amSTL - PHL

1 stop6h 54mUnited Airlines

Tue 6/1710:35 amPHL - STL

2 stops11h 50mUnited Airlines

Deal found 4/29

$396

Wed 5/285:00 amSTL - PHL

1 stop4h 04mAmerican Airlines

Sat 5/3110:53 amPHL - STL

Nonstop2h 34mAmerican Airlines

Deal found 4/29

$330

Wed 5/2811:32 amSTL - PHL

2 stops10h 33mDelta

Sat 5/319:59 amPHL - STL

2 stops8h 11mDelta

Deal found 4/29

$1,404

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 April 30, 2025.

Wed 5/285:45 pmSTL - PHL

1 stop12h 55mFrontier

Deal found 4/29

$95

Tue 7/297:37 pmSTL - PHL

1 stop13h 08mSpirit Airlines

Deal found 4/29

$136

Thu 6/59:50 amSTL - PHL

2 stops28h 12mMultiple Airlines

Deal found 4/28

$144

Wed 5/286:00 amSTL - PHL

Nonstop2h 11mAmerican Airlines

Deal found 4/29

$151

Wed 7/308:00 amSTL - PHL

1 stop5h 29mUnited Airlines

Deal found 4/28

$161

Tue 7/229:25 amSTL - PHL

2 stops8h 20mSouthwest

Deal found 4/28

$166

Sun 8/245:10 pmSTL - PHL

1 stop17h 04mSun Country Air

Deal found 4/28

$173

Tue 5/135:40 pmSTL - PHL

1 stop6h 17mDelta

Deal found 4/28

$276

Sat 6/75:05 pmSTL - SBY

1 stop4h 00mAmerican Airlines

Deal found 4/28

$375

Fri 6/137:32 pmSTL - SBY

2 stops25h 33mAlaska Airlines

Deal found 4/29

$709

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

Wed 7/23

11:45 am-6:25 pm

1 stop5h 40m

Philadelphia

Tue 7/29

5:30 am-12:35 pm

2 stops8h 05m

$326

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Sat 5/24

10:10 am-10:43 pm

1 stop11h 33m

Philadelphia

Sun 5/25

5:45 am-6:41 pm

3 stops37h 56m

$328

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Wed 5/28

5:00 am-10:04 am

1 stop4h 04m

Philadelphia

Sat 5/31

10:53 am-12:27 pm

Nonstop2h 34m

$330

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Sat 7/12

7:29 pm-5:09 am

1 stop8h 40m

Philadelphia

Mon 7/14

4:32 pm-11:47 pm

1 stop8h 15m

$332

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Fri 6/13

11:28 am-7:48 am

2 stops19h 20m

Philadelphia

Sun 6/15

2:38 pm-6:18 pm

2 stops28h 40m

$341

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Tue 7/8

6:40 am-11:45 am

1 stop4h 05m

Philadelphia

Fri 7/11

6:00 am-9:33 am

1 stop4h 33m

$369

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Tue 5/27

6:30 am-2:24 pm

1 stop6h 54m

Philadelphia

Tue 6/17

10:35 am-9:25 pm

2 stops11h 50m

$396

St. LouisSalisbury

STL - SBY

STLSBY

Lambert-St Louis

Tue 6/10

4:41 pm-9:58 pm

1 stop4h 17m

Salisbury-Ocean City

Sat 6/14

5:29 pm-11:59 pm

1 stop7h 30m

$402

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Wed 5/28

5:45 pm-7:40 am

1 stop12h 55m

$95

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Mon 6/16

11:28 am-9:47 am

1 stop21h 19m

$149

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/29

Showing 1-10 of 17 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

Rainfall in Delaware 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

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

Read through reviews of airlines operating flights from St. Louis to Delaware, such as Alaska Airlines, Southwest and Delta. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Alaska Airlines

8.0

Very good

9,961 reviews

Reviews

1 / 20

10.0

Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

Alaska Airlines

8.0

Very good

9,961 reviews

Alaska Airlines

8.0

Very good

9,961 reviews

Reviews

1 / 20

10.0

Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

Southwest

8.0

Very good

4,295 reviews

Alaska Airlines

8.0

Very good

9,961 reviews

Reviews

1 / 20

10.0

Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

Delta

8.0

Very good

7,929 reviews

Alaska Airlines

8.0

Very good

9,961 reviews

Reviews

1 / 20

10.0

Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

United Airlines

7.4

Good

8,696 reviews

Alaska Airlines

8.0

Very good

9,961 reviews

Reviews

1 / 20

10.0

Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

American Airlines

7.2

Good

10,000 reviews

Alaska Airlines

8.0

Very good

9,961 reviews

Reviews

1 / 20

10.0

Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

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.
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 $95. Users have also found prices from $136 and $151 on Spirit Airlines and American Airlines, 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

Browse thousands of different options on Cheapflights for your next trip

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$95+ 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 5/28. 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

Keep the following information in mind while searching for St. Louis to Delaware flight deals. Data was last updated April 30, 2025.

Most accurate provider

Most trusted provider

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Find 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 April 30, 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 April 30, 2025.

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

Rainfall in Delaware by month

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

Temperature in Delaware by month

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

Reviews of airlines servicing Delaware

Read through reviews of airlines operating flights from St. Louis to Delaware, such as Alaska Airlines, Southwest and Delta. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

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?

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

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?

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.

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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 April 30, 2025.