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Cheap flights from Pennsylvania to St. Louis from $46

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Pennsylvania to St. Louis departing on 1/15. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Find the cheapest flights from Pennsylvania to St. Louis

Cheap round-trip flights

Enter your travel dates to find the best prices.
Southwest Logo
7:10 am - 11:45 amPIT-STL
5h 35m1 stop
Southwest Logo
8:25 am - 6:25 pmSTL-PIT
9h 00m1 stop
$101Southwest
Find Deal
jue., oct. 30 - mar., nov. 4
Southwest Logo
6:00 am - 11:30 amPIT-STL
6h 30m1 stop
Southwest Logo
5:35 am - 4:45 pmSTL-PIT
10h 10m2 stops
$106Southwest
Find Deal
jue., oct. 30 - mar., nov. 4
American Airlines Logo
11:30 am - 4:03 pmPIT-STL
5h 33m1 stop
American Airlines Logo
6:02 am - 12:18 pmSTL-PIT
5h 16m1 stop
$159American Airlines
Find Deal
mar., oct. 28 - mar., nov. 4
American Airlines Logo
11:30 am - 6:13 pmPIT-STL
7h 43m1 stop
American Airlines Logo
11:06 am - 3:52 pmSTL-PIT
3h 46m1 stop
$165American Airlines
Find Deal
sáb., ene. 17 - mar., ene. 20
Frontier Logo
6:59 am - 5:10 pmJFK-STL
11h 11m1 stop
Frontier Logo
9:59 pm - 5:30 amSTL-JFK
30h 31m1 stop
$211Frontier
Find Deal
vie., oct. 17 - lun., oct. 20
Frontier Logo
5:30 pm - 10:12 amLGA-STL
17h 42m1 stop
Frontier Logo
7:45 pm - 11:29 amSTL-LGA
14h 44m2 stops
$212Frontier
Find Deal
mié., nov. 5 - lun., nov. 10
Multiple Airlines Logo
5:30 pm - 10:12 amLGA-STL
17h 42m1 stop
Multiple Airlines Logo
2:12 pm - 9:00 amSTL-LGA
17h 48m1 stop
$213Multiple Airlines
Find Deal
mié., nov. 5 - lun., nov. 10
Multiple Airlines Logo
6:30 pm - 10:37 amLGA-STL
17h 07m2 stops
Multiple Airlines Logo
10:57 am - 10:07 pmSTL-LGA
10h 10m1 stop
$217Multiple Airlines
Find Deal
mié., oct. 22 - dom., oct. 26
Spirit Airlines Logo
10:15 am - 5:57 pmPIT-STL
8h 42m1 stop
Spirit Airlines Logo
6:21 pm - 11:09 amSTL-PIT
15h 48m1 stop
$222Spirit Airlines
Find Deal
jue., nov. 13 - dom., nov. 16
Spirit Airlines Logo
8:29 am - 5:57 pmLGA-STL
10h 28m1 stop
Spirit Airlines Logo
6:21 pm - 10:00 amSTL-LGA
14h 39m1 stop
$225Spirit Airlines
Find Deal
jue., nov. 6 - dom., nov. 9

American Airlines flights from Pennsylvania to St. Louis

Our best American Airlines deals on Pennsylvania to St. Louis flight tickets
American Airlines
Oct 28
PIT11:30 amPittsburgh
5h 33m
1 stop
STL4:03 pmLambert-St Louis
Nov 4
STL6:02 amLambert-St Louis
5h 16m
1 stop
PIT12:18 pmPittsburgh
$159
Find similar
American Airlines
Jan 17
PIT11:30 amPittsburgh
7h 43m
1 stop
STL6:13 pmLambert-St Louis
Jan 20
STL11:06 amLambert-St Louis
3h 46m
1 stop
PIT3:52 pmPittsburgh
$165
Find similar
American Airlines
Nov 18
DCA2:55 pmWashington, D.C. Reagan-National
2h 41m
STL4:36 pmLambert-St Louis
Nov 19
STL1:50 pmLambert-St Louis
2h 08m
DCA4:58 pmWashington, D.C. Reagan-National
$229
Find similar

Frontier flights from Pennsylvania to St. Louis

Our best Frontier deals on Pennsylvania to St. Louis flight tickets
Frontier
Oct 17
JFK6:59 amNew York John F Kennedy Intl
11h 11m
1 stop
STL5:10 pmLambert-St Louis
Oct 20
STL9:59 pmLambert-St Louis
30h 31m
1 stop
JFK5:30 amNew York John F Kennedy Intl
$211
Find similar
Frontier
Nov 5
LGA5:30 pmNew York LaGuardia
17h 42m
1 stop
STL10:12 amLambert-St Louis
Nov 10
STL7:45 pmLambert-St Louis
14h 44m
2 stops
LGA11:29 amNew York LaGuardia
$212
Find similar
Frontier
Nov 7
JFK10:00 amNew York John F Kennedy Intl
7h 01m
1 stop
STL4:01 pmLambert-St Louis
Nov 9
STL5:12 pmLambert-St Louis
16h 17m
1 stop
JFK10:29 amNew York John F Kennedy Intl
$214
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Pennsylvania to St. Louis 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 octubre 2, 2025.
Use the filters below to find and compare flights from Pennsylvania to St. Louis that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

jue. 10/30

7:10 am-11:45 am

1 stop5h 35m

Lambert-St Louis

mar. 11/4

8:25 am-6:25 pm

1 stop9h 00m

$101

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

jue. 10/30

6:00 am-11:30 am

1 stop6h 30m

Lambert-St Louis

mar. 11/4

5:35 am-4:45 pm

2 stops10h 10m

$106

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

mar. 10/28

11:30 am-4:03 pm

1 stop5h 33m

Lambert-St Louis

mar. 11/4

6:02 am-12:18 pm

1 stop5h 16m

$159

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

sáb. 1/17

11:30 am-6:13 pm

1 stop7h 43m

Lambert-St Louis

mar. 1/20

11:06 am-3:52 pm

1 stop3h 46m

$165

New YorkSt. Louis

JFK - STL

JFKSTL

New York John F Kennedy Intl

vie. 10/17

6:59 am-5:10 pm

1 stop11h 11m

Lambert-St Louis

lun. 10/20

9:59 pm-5:30 am

1 stop30h 31m

$211

New YorkSt. Louis

LGA - STL

LGASTL

New York LaGuardia

mié. 11/5

5:30 pm-10:12 am

1 stop17h 42m

Lambert-St Louis

lun. 11/10

7:45 pm-11:29 am

2 stops14h 44m

$212

New YorkSt. Louis

LGA - STL

LGASTL

New York LaGuardia

mié. 11/5

5:30 pm-10:12 am

1 stop17h 42m

Lambert-St Louis

lun. 11/10

2:12 pm-9:00 am

1 stop17h 48m

$213

New YorkSt. Louis

LGA - STL

LGASTL

New York LaGuardia

mié. 10/22

6:30 pm-10:37 am

2 stops17h 07m

Lambert-St Louis

dom. 10/26

10:57 am-10:07 pm

1 stop10h 10m

$217

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

jue. 11/13

10:15 am-5:57 pm

1 stop8h 42m

Lambert-St Louis

dom. 11/16

6:21 pm-11:09 am

1 stop15h 48m

$222

New YorkSt. Louis

LGA - STL

LGASTL

New York LaGuardia

jue. 11/6

8:29 am-5:57 pm

1 stop10h 28m

Lambert-St Louis

dom. 11/9

6:21 pm-10:00 am

1 stop14h 39m

$225

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 St. Louis from

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

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 St. Louis?

In general, August is the cheapest month to fly from Pennsylvania to St. Louis. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $320. The month of September is another great option to travel to St. Louis, with average flight prices from Pennsylvania averaging around $355.

What is the cheapest day to depart on your flight to St. Louis?

The cheapest day to depart on your flight to St. Louis is on a Wednesday when prices can be found for as low as $391. 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 $468. These prices are subject to change though, so be sure to set up a Price Alert for flights to St. Louis.

What is the cheapest time of day to depart on your flight to St. Louis?

Flying to St. Louis from Pennsylvania in the afternoon is the least expensive time of day to depart. momondo users have found prices as low as $384 when looking at flights departing in the afternoon. At noon is when there is more demand to fly to St. Louis, so prices are often more expensive at around $429 per ticket.

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

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

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

You are more likely to see cheaper flights to St. Louis from Pennsylvania when booking weeks ahead of your departure date. In general, you can expect to find flights to St. Louis for around $401 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to St. Louis from Pennsylvania for as low as $343 on momondo.

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

There are 3 cabin classes available to choose from on Pennsylvania to Lambert-St Louis 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 Pennsylvania to St. Louis flights?

You could potentially save up to 28% on your flight if you consider stops on a Pennsylvania to St. Louis flight.

Cheap Pennsylvania to St. Louis flight deals and tips

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

Best Price Found

$213

Fastest flight time

1h 45m

Direct flights

Every day

Airports in St. Louis

1 airport
The best one-way flight to St. Louis from Pennsylvania in the past 72 hours is $213. The best round-trip flight deal from Pennsylvania to St. Louis found on momondo in the last 72 hours is $315.
The fastest flight from Pennsylvania to St. Louis takes 1h 45m
Direct flights go from Pennsylvania to St. Louis every day.
There is 1 airport near St. Louis: Lambert-St Louis (STL)
Search flight deals

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

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

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

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

    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 Pennsylvania to Lambert-St Louis Airport.

  • What documentation or ID do you need to fly to Lambert-St Louis Airport?

    The required travel and health documents for your Lambert-St Louis Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Lambert-St Louis Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

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

Best airlines flying from Pennsylvania to St. Louis

Compare and see reviews for airlines that fly from Pennsylvania to St. Louis with momondo
Airline
Rating
Free Cancellation
Price
Spirit AirlinesPriceFrom $95Free CancellationRating
6.3
8,070 reviews
Search Spirit Airlines flights
FrontierPriceFrom $119Free CancellationRating
5.8
3,155 reviews
Search Frontier flights
American AirlinesPriceFrom $171Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
SouthwestPriceFrom $241Free CancellationRating
8.0
4,248 reviews
Search Southwest flights
DeltaPriceFrom $248Free CancellationRating
7.9
7,962 reviews
Search Delta flights
United AirlinesPriceFrom $248Free CancellationRating
7.4
8,933 reviews
Search United Airlines flights

Traveling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
St. Charles
Chesterfield
Hermann
Fairview Heights
Florissant
Maryland Heights
O'Fallon
Collinsville
Fenton
Wentzville
St. Peters
Alton
Farmington
Festus
Glencoe
Clayton
Edwardsville
Eureka
Litchfield
Shrewsbury

Why use momondo?

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

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Pennsylvania to St. Louis. Millions of users trust and use momondo every year so you are in good hands.

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

momondo does allow users to show only those flights to St. Louis from Pennsylvania which offer a flexible booking policy as well as other useful filters and features.

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

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 St. Louis from Pennsylvania.

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

Yes momondo offers price alerts on flights to St. Louis from Pennsylvania. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

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