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Cheap flights from St. Louis to Pennsylvania from $72

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Pennsylvania departing on 10/30. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Find the cheapest flights from St. Louis to Pennsylvania

Cheap round-trip flights

Frontier Logo
4:00 pm - 1:06 amSTL-EWR
8h 06m1 stop
Frontier Logo
5:55 am - 3:04 pmEWR-STL
10h 09m1 stop
$144Frontier
Find Deal
Thu, Oct 2 - Sun, Oct 5
Frontier Logo
7:45 pm - 4:49 amSTL-PHL
8h 04m1 stop
Frontier Logo
5:50 am - 10:12 amPHL-STL
5h 22m1 stop
$153Frontier
Find Deal
Thu, Nov 13 - Sun, Nov 16
American Airlines Logo
1:59 pm - 10:41 pmSTL-EWR
7h 42m1 stop
American Airlines Logo
8:29 am - 1:18 pmEWR-STL
5h 49m1 stop
$179American Airlines
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Sat, Dec 6 - Tue, Dec 9
American Airlines Logo
10:22 am - 6:59 pmSTL-EWR
7h 37m1 stop
American Airlines Logo
6:00 am - 9:37 amEWR-STL
4h 37m1 stop
$189American Airlines
Find Deal
Tue, Oct 14 - Tue, Oct 21
United Airlines Logo
7:00 am - 10:29 amSTL-EWR
2h 29mnonstop
United Airlines Logo
8:49 am - 10:41 amEWR-STL
2h 52mnonstop
$197United Airlines
Find Deal
Sat, Nov 1 - Sun, Nov 2
United Airlines Logo
11:05 am - 7:43 pmSTL-EWR
7h 38m1 stop
United Airlines Logo
8:49 am - 10:41 amEWR-STL
2h 52mnonstop
$207United Airlines
Find Deal
Sat, Nov 1 - Sun, Nov 2
Delta Logo
10:45 am - 6:45 pmSTL-JFK
7h 00m1 stop
Delta Logo
12:59 pm - 5:09 pmJFK-STL
5h 10m1 stop
$217Delta
Find Deal
Sat, Nov 8 - Tue, Nov 11
Delta Logo
1:30 pm - 9:07 pmSTL-EWR
6h 37m1 stop
Delta Logo
5:00 am - 9:31 amEWR-STL
5h 31m1 stop
$217Delta
Find Deal
Sat, Nov 1 - Sun, Nov 2
Southwest Logo
6:15 pm - 8:50 pmSTL-PIT
1h 35mnonstop
Southwest Logo
12:15 pm - 1:00 pmPIT-STL
1h 45mnonstop
$251Southwest
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Tue, Nov 4 - Thu, Nov 6
Southwest Logo
8:25 am - 11:20 amSTL-DCA
1h 55mnonstop
Southwest Logo
6:50 pm - 8:05 pmDCA-STL
2h 15mnonstop
$260Southwest
Find Deal
Sat, Oct 25 - Tue, Oct 28

Delta flights from St. Louis to Pennsylvania

Our best Delta deals on St. Louis to Pennsylvania flight tickets
Delta
Nov 8
STL10:45 amLambert-St Louis
7h 00m
1 stop
JFK6:45 pmNew York John F Kennedy Intl
Nov 11
JFK12:59 pmNew York John F Kennedy Intl
5h 10m
1 stop
STL5:09 pmLambert-St Louis
$217
Find similar
Delta
Oct 31
STL5:40 pmLambert-St Louis
2h 23m
LGA9:03 pmNew York LaGuardia
Nov 2
LGA5:30 amNew York LaGuardia
2h 43m
STL7:13 amLambert-St Louis
$219
Find similar
Delta
Nov 6
STL6:00 amLambert-St Louis
2h 28m
LGA9:28 amNew York LaGuardia
Nov 8
LGA9:45 amNew York LaGuardia
2h 53m
STL11:38 amLambert-St Louis
$227
Find similar

American Airlines flights from St. Louis to Pennsylvania

Our best American Airlines deals on St. Louis to Pennsylvania flight tickets
American Airlines
Dec 6
STL1:59 pmLambert-St Louis
7h 42m
1 stop
EWR10:41 pmNewark
Dec 9
EWR8:29 amNewark
5h 49m
1 stop
STL1:18 pmLambert-St Louis
$179
Find similar
American Airlines
Oct 14
STL10:22 amLambert-St Louis
7h 37m
1 stop
EWR6:59 pmNewark
Oct 21
EWR6:00 amNewark
4h 37m
1 stop
STL9:37 amLambert-St Louis
$189
Find similar
American Airlines
Oct 21
STL12:51 pmLambert-St Louis
5h 08m
1 stop
EWR6:59 pmNewark
Oct 24
EWR7:40 pmNewark
5h 14m
1 stop
STL11:54 pmLambert-St Louis
$209
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from St. Louis to Pennsylvania 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, momondo users made 832,500 searches. Data last updated September 21, 2025.
Use the filters below to find and compare flights from St. Louis to Pennsylvania that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisNewark

STL - EWR

STLEWR

Lambert-St Louis

Thu 10/2

4:00 pm-1:06 am

1 stop8h 06m

Newark

Sun 10/5

5:55 am-3:04 pm

1 stop10h 09m

$144

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Thu 11/13

7:45 pm-4:49 am

1 stop8h 04m

Philadelphia

Sun 11/16

5:50 am-10:12 am

1 stop5h 22m

$153

St. LouisNewark

STL - EWR

STLEWR

Lambert-St Louis

Sat 12/6

1:59 pm-10:41 pm

1 stop7h 42m

Newark

Tue 12/9

8:29 am-1:18 pm

1 stop5h 49m

$179

St. LouisNewark

STL - EWR

STLEWR

Lambert-St Louis

Tue 10/14

10:22 am-6:59 pm

1 stop7h 37m

Newark

Tue 10/21

6:00 am-9:37 am

1 stop4h 37m

$189

St. LouisNewark

STL - EWR

STLEWR

Lambert-St Louis

Sat 11/1

7:00 am-10:29 am

Nonstop2h 29m

Newark

Sun 11/2

8:49 am-10:41 am

Nonstop2h 52m

$197

St. LouisNewark

STL - EWR

STLEWR

Lambert-St Louis

Sat 11/1

11:05 am-7:43 pm

1 stop7h 38m

Newark

Sun 11/2

8:49 am-10:41 am

Nonstop2h 52m

$207

St. LouisNew York

STL - JFK

STLJFK

Lambert-St Louis

Sat 11/8

10:45 am-6:45 pm

1 stop7h 00m

New York John F Kennedy Intl

Tue 11/11

12:59 pm-5:09 pm

1 stop5h 10m

$217

St. LouisNewark

STL - EWR

STLEWR

Lambert-St Louis

Sat 11/1

1:30 pm-9:07 pm

1 stop6h 37m

Newark

Sun 11/2

5:00 am-9:31 am

1 stop5h 31m

$217

St. LouisPittsburgh

STL - PIT

STLPIT

Lambert-St Louis

Tue 11/4

6:15 pm-8:50 pm

Nonstop1h 35m

Pittsburgh

Thu 11/6

12:15 pm-1:00 pm

Nonstop1h 45m

$251

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Sat 10/25

8:25 am-11:20 am

Nonstop1h 55m

Washington, D.C. Reagan-National

Tue 10/28

6:50 pm-8:05 pm

Nonstop2h 15m

$260

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Pennsylvania from

How to get the cheapest flight ticket from St. Louis to Pennsylvania

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to Pennsylvania?

The month of August is, on average, the cheapest month to fly to Pennsylvania from St. Louis, with most prices found around $277. If you don’t want to visit Pennsylvania in August, then you should wait until September to fly from St. Louis, when ticket prices are also cheap, with an average price of $353.

What is the cheapest day to depart on your flight to Pennsylvania?

The cheapest day to depart on your flight to Pennsylvania is on a Thursday when prices can be found for as low as $726. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Sunday because tickets tend to average around $992. These prices are subject to change though, so be sure to set up a Price Alert for flights to Pennsylvania.

What is the cheapest time of day to depart on your flight to Pennsylvania?

Our most recent data shows that the best time of day to fly to Pennsylvania is in the evening. Flights from St. Louis to Pennsylvania during this time can be as low as $420. In contrast, the most expensive time of day to depart to Pennsylvania is at noon when prices are around $1,164.

What is the cheapest Lambert-St Louis to Pennsylvania flight route?

Fly from Lambert-St Louis to Pittsburgh for the best Lambert-St Louis - Pennsylvania flight prices

How far in advance should I book a flight to Pennsylvania?

You are more likely to see cheaper flights to Pennsylvania from St. Louis when booking weeks ahead of your departure date. In general, you can expect to find flights to Pennsylvania for around $392 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Pennsylvania from St. Louis for as low as $328 on momondo.

What cabin class options are available on Lambert-St Louis to Pennsylvania flights?

There are 4 cabin classes available to choose from on Lambert-St Louis to Pennsylvania flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on St. Louis to Pennsylvania flights?

You could potentially save up to 10% on your flight if you consider stops on a St. Louis to Pennsylvania flight.

Cheap St. Louis to Pennsylvania flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to Pennsylvania

Best Price Found

$221

Fastest flight time

1h 35m

Direct flights

Every day

Airports in Pennsylvania

2 airports
The best one-way flight to Pennsylvania from St. Louis in the past 72 hours is $221. The best round-trip flight deal from St. Louis to Pennsylvania found on momondo in the last 72 hours is $248.
The fastest flight from St. Louis to Pennsylvania takes 1h 35m
Direct flights go from St. Louis to Pennsylvania every day.
There are 2 airports near Pennsylvania: Washington, D.C. Reagan-National (DCA), Pittsburgh (PIT)
Search flight deals

  • When did momondo last update prices for flights from Lambert-St Louis Airport to Pennsylvania?

    Prices for flights from Lambert-St Louis Airport to Pennsylvania refresh daily.

  • How many operators does momondo search for flights from Lambert-St Louis Airport to Pennsylvania?

  • How old do you have to be to fly from Lambert-St Louis Airport to Pennsylvania?

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Lambert-St Louis Airport to Pennsylvania.

  • What documentation or ID do you need to fly to Pennsylvania?

    The travel and health documents you'll need for your trip to Pennsylvania may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Pennsylvania. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

  • What is the most popular plane model from St. Louis to Pennsylvania?

Best airlines flying from St. Louis to Pennsylvania

Compare and see reviews for airlines that fly from St. Louis to Pennsylvania with momondo
Airline
Rating
Free Cancellation
Price
Spirit AirlinesPriceFrom $106Free CancellationRating
6.3
8,031 reviews
Search Spirit Airlines flights
FrontierPriceFrom $137Free CancellationRating
5.8
3,166 reviews
Search Frontier flights
DeltaPriceFrom $211Free CancellationRating
7.9
7,971 reviews
Search Delta flights
American AirlinesPriceFrom $227Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
United AirlinesPriceFrom $248Free CancellationRating
7.4
8,922 reviews
Search United Airlines flights
SouthwestPriceFrom $253Free CancellationRating
8.0
4,244 reviews
Search Southwest flights

Why use momondo?

Why should I use momondo to find a flight deal from St. Louis to Pennsylvania?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from St. Louis to Pennsylvania. momondo saves you time and could save you money on your trip.

Can I find flights from St. Louis to Pennsylvania with flexible booking policies on momondo?

Yes. All flights to Pennsylvania from St. Louis on momondo can be compared and filtered by various policies on offer, including flexible booking.

How can momondo help me find flights from St. Louis to Pennsylvania?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Pennsylvania from St. Louis.

I’m not ready to book a flight from St. Louis to Pennsylvania right now. Can momondo alert me if prices change?

Yes. momondo can track prices for St. Louis to Pennsylvania flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

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