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Cheap flights from Williamsport to St. Louis from $384

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Williamsport to St. Louis departing on 3/20. 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 Williamsport to St. Louis

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
2:50 pm - 11:59 pm
IPT
-
STL
34h 09m
2 stops
Multiple Airlines Logo
7:00 am - 2:15 pm
STL
-
IPT
30h 15m
2 stops
$1,344Multiple Airlines
Sat, Apr 4 - Sat, Apr 11

momondo Fare Finder

 
Customize your flight search to find flights from Williamsport 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 March 12, 2026.
Use the filters below to find and compare flights from Williamsport to St. Louis that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip
Quickest round-trip

WilliamsportSt. Louis

IPT - STL

IPTSTL

Williamsport Lycoming County

Sat 4/4

2:50 pm-11:59 pm

2 stops34h 09m

Lambert-St Louis

Sat 4/11

7:00 am-2:15 pm

2 stops30h 15m

$1,344
Cheapest one-way

WilliamsportSt. Louis

IPT - STL

IPTSTL

Williamsport Lycoming County

Fri 3/20

2:50 pm-8:10 pm

3 stops54h 20m

$384

WilliamsportSt. Louis

IPT - STL

IPTSTL

Williamsport Lycoming County

Sat 3/21

2:50 pm-9:49 am

2 stops43h 59m

$420

WilliamsportSt. Louis

IPT - STL

IPTSTL

Williamsport Lycoming County

Sat 3/21

2:50 pm-11:31 am

3 stops45h 41m

$436

WilliamsportSt. Louis

IPT - STL

IPTSTL

Williamsport Lycoming County

Fri 3/20

5:55 am-9:49 am

2 stops28h 54m

$447
Quickest one-way

WilliamsportSt. Louis

IPT - STL

IPTSTL

Williamsport Lycoming County

Sat 4/11

2:50 pm-11:37 am

3 stops21h 47m

$1,751

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

See travel insights to St. Louis from

How to get the cheapest flight ticket from Williamsport 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 airlines fly to St. Louis?

American Airlines, United Airlines and Delta are the top three most popular airlines that fly to St. Louis from Williamsport according to our data. American Airlines is the first choice among our users, with 56% of people opting to fly with this airline when traveling to St. Louis. Keep in mind that there are 3 different airlines that fly to St. Louis on a routine basis, so you have a few additional options to choose from.

When to book flights from Williamsport to St. Louis

Are you open to changing your travel dates? Check out the ideal times to fly from Williamsport to St. Louis according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Williamsport to St. Louis (IPT to STL) flight deals and tips

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

Fastest flight time

34h 09m

Direct flights

None
The fastest flight from Williamsport to St. Louis takes 34h 09m
There are no direct flights from Williamsport to St. Louis. There are no popular flight routes from Williamsport to St. Louis.
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  • How far is Williamsport Lycoming County to Lambert-St Louis by plane?

    A flight from Williamsport Lycoming County to Lambert-St Louis will travel around 720.8 mi. By plane, this route typically takes 34h 09m.

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

    Prices for flights from Williamsport Lycoming County Airport to Lambert-St Louis Airport refresh daily.

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

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Williamsport Lycoming County Airport to Lambert-St Louis Airport.

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

    The travel and health documents you'll need for your trip to Lambert-St Louis Airport 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 Lambert-St Louis Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

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
St. Peters
Fenton
Alton
Wentzville
Farmington
Edwardsville
Festus
Clayton
Eureka
Litchfield
Glencoe
Shrewsbury

Why use momondo?

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

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

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

Yes. momondo allows you to filter the results for Williamsport to St. Louis flights to just show those with flexible booking policies.

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

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Williamsport to St. Louis.

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

If you are not ready to book a flight from Williamsport to St. Louis now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to St. Louis and let you know when they change.

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