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Cheap flights from St. Louis to Pennsylvania from $54

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 9/11. 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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0 bags

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Find the cheapest flights from St. Louis to Pennsylvania

Cheap round-trip flights

Spirit Airlines Logo
2:30 pm - 9:00 pmSTL-EWR
5h 30m1 stop
Spirit Airlines Logo
10:00 am - 1:32 pmEWR-STL
4h 32m1 stop
$137Spirit Airlines
Find Deal
lun., ago. 18 - lun., ago. 25
Spirit Airlines Logo
12:05 pm - 9:01 pmSTL-EWR
7h 56m1 stop
Spirit Airlines Logo
8:25 pm - 10:50 amEWR-STL
15h 25m1 stop
$142Spirit Airlines
Find Deal
jue., sep. 18 - sáb., sep. 20
American Airlines Logo
6:06 am - 6:05 pmSTL-PIT
10h 59m1 stop
American Airlines Logo
8:20 am - 3:49 pmPIT-STL
8h 29m1 stop
$171American Airlines
Find Deal
mar., ago. 26 - mar., sep. 2
Delta Logo
6:05 am - 9:33 amSTL-LGA
2h 28mnonstop
Delta Logo
6:20 am - 7:56 amLGA-STL
2h 36mnonstop
$197Delta
Find Deal
jue., sep. 18 - dom., sep. 21
Delta Logo
4:10 pm - 7:58 pmSTL-JFK
2h 48mnonstop
Delta Logo
2:55 pm - 4:48 pmJFK-STL
2h 53mnonstop
$197Delta
Find Deal
mié., sep. 17 - sáb., sep. 20
American Airlines Logo
7:23 am - 3:59 pmSTL-PIT
7h 36m1 stop
American Airlines Logo
7:45 am - 1:51 pmPIT-STL
7h 06m1 stop
$198American Airlines
Find Deal
sáb., ago. 23 - lun., ago. 25
Frontier Logo
2:52 pm - 11:26 pmSTL-IAD
7h 34m1 stop
Frontier Logo
6:10 am - 1:33 pmIAD-STL
8h 23m1 stop
$198Frontier
Find Deal
sáb., ago. 16 - sáb., ago. 23
Frontier Logo
5:40 pm - 10:08 amSTL-MDT
15h 28m1 stop
Frontier Logo
11:23 am - 11:47 pmMDT-STL
13h 24m1 stop
$205Frontier
Find Deal
mié., ago. 13 - sáb., ago. 16
Southwest Logo
11:55 am - 3:10 pmSTL-PHL
2h 15mnonstop
Southwest Logo
7:50 am - 9:10 amPHL-STL
2h 20mnonstop
$217Southwest
Find Deal
sáb., ago. 23 - lun., ago. 25
Southwest Logo
8:25 am - 11:00 amSTL-PIT
1h 35mnonstop
Southwest Logo
4:00 pm - 4:45 pmPIT-STL
1h 45mnonstop
$217Southwest
Find Deal
jue., ago. 21 - lun., ago. 25

Delta flights from St. Louis to Pennsylvania

Our best Delta deals on St. Louis to Pennsylvania flight tickets
Delta
Sep 17
STL4:10 pmLambert-St Louis
2h 48m
JFK7:58 pmNew York John F Kennedy Intl
Sep 20
JFK2:55 pmNew York John F Kennedy Intl
2h 53m
STL4:48 pmLambert-St Louis
$197
Find similar
Delta
Sep 17
STL4:10 pmLambert-St Louis
2h 48m
JFK7:58 pmNew York John F Kennedy Intl
Sep 20
JFK6:00 amNew York John F Kennedy Intl
7h 21m
1 stop
STL12:21 pmLambert-St Louis
$207
Find similar
Delta
Aug 26
STL12:00 pmLambert-St Louis
2h 31m
LGA3:31 pmNew York LaGuardia
Sep 3
LGA4:15 pmNew York LaGuardia
2h 59m
STL6:14 pmLambert-St Louis
$217
Find similar

American Airlines flights from St. Louis to Pennsylvania

Our best American Airlines deals on St. Louis to Pennsylvania flight tickets
American Airlines
Aug 26
STL6:06 amLambert-St Louis
10h 59m
1 stop
PIT6:05 pmPittsburgh
Sep 2
PIT8:20 amPittsburgh
8h 29m
1 stop
STL3:49 pmLambert-St Louis
$171
Find similar
American Airlines
Aug 23
STL7:23 amLambert-St Louis
7h 36m
1 stop
PIT3:59 pmPittsburgh
Aug 25
PIT7:45 amPittsburgh
7h 06m
1 stop
STL1:51 pmLambert-St Louis
$198
Find similar
American Airlines
Aug 23
STL7:23 amLambert-St Louis
7h 36m
1 stop
PIT3:59 pmPittsburgh
Aug 24
PIT8:57 amPittsburgh
4h 14m
1 stop
STL12:11 pmLambert-St Louis
$199
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 julio 31, 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

lun. 8/18

2:30 pm-9:00 pm

1 stop5h 30m

Newark

lun. 8/25

10:00 am-1:32 pm

1 stop4h 32m

$137

St. LouisNewark

STL - EWR

STLEWR

Lambert-St Louis

jue. 9/18

12:05 pm-9:01 pm

1 stop7h 56m

Newark

sáb. 9/20

8:25 pm-10:50 am

1 stop15h 25m

$142

St. LouisPittsburgh

STL - PIT

STLPIT

Lambert-St Louis

mar. 8/26

6:06 am-6:05 pm

1 stop10h 59m

Pittsburgh

mar. 9/2

8:20 am-3:49 pm

1 stop8h 29m

$171

St. LouisNew York

STL - LGA

STLLGA

Lambert-St Louis

jue. 9/18

6:05 am-9:33 am

Nonstop2h 28m

New York LaGuardia

dom. 9/21

6:20 am-7:56 am

Nonstop2h 36m

$197

St. LouisNew York

STL - JFK

STLJFK

Lambert-St Louis

mié. 9/17

4:10 pm-7:58 pm

Nonstop2h 48m

New York John F Kennedy Intl

sáb. 9/20

2:55 pm-4:48 pm

Nonstop2h 53m

$197

St. LouisPittsburgh

STL - PIT

STLPIT

Lambert-St Louis

sáb. 8/23

7:23 am-3:59 pm

1 stop7h 36m

Pittsburgh

lun. 8/25

7:45 am-1:51 pm

1 stop7h 06m

$198

St. LouisWashington, D.C.

STL - IAD

STLIAD

Lambert-St Louis

sáb. 8/16

2:52 pm-11:26 pm

1 stop7h 34m

Washington, D.C. Dulles Intl

sáb. 8/23

6:10 am-1:33 pm

1 stop8h 23m

$198

St. LouisHarrisburg

STL - MDT

STLMDT

Lambert-St Louis

mié. 8/13

5:40 pm-10:08 am

1 stop15h 28m

Harrisburg

sáb. 8/16

11:23 am-11:47 pm

1 stop13h 24m

$205

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

sáb. 8/23

11:55 am-3:10 pm

Nonstop2h 15m

Philadelphia

lun. 8/25

7:50 am-9:10 am

Nonstop2h 20m

$217

St. LouisPittsburgh

STL - PIT

STLPIT

Lambert-St Louis

jue. 8/21

8:25 am-11:00 am

Nonstop1h 35m

Pittsburgh

lun. 8/25

4:00 pm-4:45 pm

Nonstop1h 45m

$217

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 $246. 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 $265.

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 $654. 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 $917. 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 $405. In contrast, the most expensive time of day to depart to Pennsylvania is at noon when prices are around $1,163.

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 $366 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 $285 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 14% 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

$54

Fastest flight time

1h 35m

Direct flights

Every day

Airports in Pennsylvania

6 airports
The best one-way flight to Pennsylvania from St. Louis in the past 72 hours is $54. The best round-trip flight deal from St. Louis to Pennsylvania found on momondo in the last 72 hours is $137.
The fastest flight from St. Louis to Pennsylvania takes 1h 35m
Direct flights go from St. Louis to Pennsylvania every day.
There are 6 airports near Pennsylvania: Newark (EWR), Washington, D.C. Reagan-National (DCA), Philadelphia (PHL), New York LaGuardia (LGA), Pittsburgh (PIT), Washington, D.C. Dulles Intl (IAD)
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  • 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
FrontierPriceFrom $63Free CancellationRating
5.9
3,239 reviews
Search Frontier flights
DeltaPriceFrom $196Free CancellationRating
8.0
7,981 reviews
Search Delta flights
American AirlinesPriceFrom $198Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
United AirlinesPriceFrom $223Free CancellationRating
7.4
8,900 reviews
Search United Airlines flights
SouthwestPriceFrom $270Free CancellationRating
8.0
4,246 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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