Latest deals
Insights
When to book
FAQs
Reviews
Price Alerts

Cheap flights from Islip, New York to St. Louis from $122

1 adult
1 adult, Economy, 0 bags

Find the cheapest flights from Islip, New York to St. Louis

Cheap round-trip flights

Enter your travel dates to find the best prices.
Southwest Logo
5:40 pm - 11:15 pmISP  Islip Long Island-STL Lambert-St Louis
6h 35m1 stop Baltimore/Washington
Southwest Logo
3:20 pm - 10:40 pmSTL  Lambert-St Louis-ISP Islip Long Island
6h 20m1 stop Baltimore/Washington
$265Southwest
Fri, Oct 2 - Tue, Oct 6
Southwest Logo
5:40 pm - 11:15 pmISP  Islip Long Island-STL Lambert-St Louis
6h 35m1 stop Baltimore/Washington
Southwest Logo
8:30 am - 3:45 pmSTL  Lambert-St Louis-ISP Islip Long Island
6h 15m2 stops Milwaukee-Mitchell Baltimore/Washington
$270Southwest
Fri, Oct 2 - Tue, Oct 6
Southwest Logo
5:40 pm - 12:35 amISP  Islip Long Island-STL Lambert-St Louis
7h 55m2 stops Baltimore/Washington Dallas Love Field
Southwest Logo
8:30 am - 3:45 pmSTL  Lambert-St Louis-ISP Islip Long Island
6h 15m2 stops Milwaukee-Mitchell Baltimore/Washington
$275Southwest
Fri, Oct 2 - Tue, Oct 6
Southwest Logo
3:10 pm - 11:20 pmISP  Islip Long Island-STL Lambert-St Louis
9h 10m1 stop Baltimore/Washington
Southwest Logo
3:20 pm - 10:40 pmSTL  Lambert-St Louis-ISP Islip Long Island
6h 20m1 stop Baltimore/Washington
$366Southwest
Fri, Oct 9 - Tue, Oct 13
Southwest Logo
3:10 pm - 11:20 pmISP  Islip Long Island-STL Lambert-St Louis
9h 10m1 stop Baltimore/Washington
Southwest Logo
5:25 am - 3:30 pmSTL  Lambert-St Louis-ISP Islip Long Island
9h 05m2 stops Orlando West Palm Beach President Donald J. Trump Intl
$372Southwest
Fri, Oct 9 - Tue, Oct 13
Southwest Logo
6:00 am - 12:15 pmISP  Islip Long Island-STL Lambert-St Louis
7h 15m2 stops Baltimore/Washington Chicago Midway
Southwest Logo
5:25 am - 3:30 pmSTL  Lambert-St Louis-ISP Islip Long Island
9h 05m2 stops Orlando West Palm Beach President Donald J. Trump Intl
$397Southwest
Fri, Oct 9 - Tue, Oct 13
Southwest Logo
3:15 pm - 8:45 pmISP  Islip Long Island-STL Lambert-St Louis
6h 30m1 stop Baltimore/Washington
Southwest Logo
1:40 pm - 9:10 pmSTL  Lambert-St Louis-ISP Islip Long Island
6h 30m1 stop Baltimore/Washington
$464Southwest
Sat, Sep 26 - Wed, Sep 30
Southwest Logo
3:15 pm - 8:45 pmISP  Islip Long Island-STL Lambert-St Louis
6h 30m1 stop Baltimore/Washington
Southwest Logo
10:45 am - 9:10 pmSTL  Lambert-St Louis-ISP Islip Long Island
9h 25m2 stops Orlando Baltimore/Washington
$469Southwest
Sat, Sep 26 - Wed, Sep 30
Southwest Logo
5:30 am - 12:35 pmISP  Islip Long Island-STL Lambert-St Louis
8h 05m2 stops Baltimore/Washington Atlanta Hartsfield-Jackson
Southwest Logo
10:45 am - 9:10 pmSTL  Lambert-St Louis-ISP Islip Long Island
9h 25m2 stops Orlando Baltimore/Washington
$475Southwest
Sat, Sep 26 - Wed, Sep 30

Save money when you book flights with momondo

Big names and deals

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

Southwest flights from Islip, New York to St. Louis

Our best Southwest deals on Islip, New York to St. Louis flight tickets
Southwest
Oct 2
ISP5:40 pmIslip Long Island
6h 35m
1 stop
STL11:15 pmLambert-St Louis
Oct 6
STL3:20 pmLambert-St Louis
6h 20m
1 stop
ISP10:40 pmIslip Long Island
$265
Southwest
Oct 2
ISP5:40 pmIslip Long Island
6h 35m
1 stop
STL11:15 pmLambert-St Louis
Oct 6
STL8:30 amLambert-St Louis
6h 15m
2 stops
ISP3:45 pmIslip Long Island
$270
Southwest
Oct 2
ISP5:40 pmIslip Long Island
7h 55m
2 stops
STL12:35 amLambert-St Louis
Oct 6
STL8:30 amLambert-St Louis
6h 15m
2 stops
ISP3:45 pmIslip Long Island
$275

momondo Fare Finder

 
Use the filters below to find and compare flights from Islip, New York to St. Louis that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

IslipSt. Louis

ISP Islip Long Island - STL Lambert-St Louis

ISPSTL

Islip Long Island

Fri 10/2

5:40 pm-11:15 pm

1 stop6h 35m

Lambert-St Louis

Tue 10/6

3:20 pm-10:40 pm

1 stop6h 20m

$265
Quickest round-trip

IslipSt. Louis

ISP Islip Long Island - STL Lambert-St Louis

ISPSTL

Islip Long Island

Fri 10/2

5:40 pm-11:15 pm

1 stop6h 35m

Lambert-St Louis

Tue 10/6

8:30 am-3:45 pm

2 stops6h 15m

$270

IslipSt. Louis

ISP Islip Long Island - STL Lambert-St Louis

ISPSTL

Islip Long Island

Fri 10/2

5:40 pm-12:35 am

2 stops7h 55m

Lambert-St Louis

Tue 10/6

8:30 am-3:45 pm

2 stops6h 15m

$275

IslipSt. Louis

ISP Islip Long Island - STL Lambert-St Louis

ISPSTL

Islip Long Island

Fri 10/9

3:10 pm-11:20 pm

1 stop9h 10m

Lambert-St Louis

Tue 10/13

3:20 pm-10:40 pm

1 stop6h 20m

$366

IslipSt. Louis

ISP Islip Long Island - STL Lambert-St Louis

ISPSTL

Islip Long Island

Fri 10/9

3:10 pm-11:20 pm

1 stop9h 10m

Lambert-St Louis

Tue 10/13

5:25 am-3:30 pm

2 stops9h 05m

$372

IslipSt. Louis

ISP Islip Long Island - STL Lambert-St Louis

ISPSTL

Islip Long Island

Fri 10/9

6:00 am-12:15 pm

2 stops7h 15m

Lambert-St Louis

Tue 10/13

5:25 am-3:30 pm

2 stops9h 05m

$397

IslipSt. Louis

ISP Islip Long Island - STL Lambert-St Louis

ISPSTL

Islip Long Island

Sat 9/26

3:15 pm-8:45 pm

1 stop6h 30m

Lambert-St Louis

Wed 9/30

1:40 pm-9:10 pm

1 stop6h 30m

$464

IslipSt. Louis

ISP Islip Long Island - STL Lambert-St Louis

ISPSTL

Islip Long Island

Sat 9/26

3:15 pm-8:45 pm

1 stop6h 30m

Lambert-St Louis

Wed 9/30

10:45 am-9:10 pm

2 stops9h 25m

$469

IslipSt. Louis

ISP Islip Long Island - STL Lambert-St Louis

ISPSTL

Islip Long Island

Sat 9/26

5:30 am-12:35 pm

2 stops8h 05m

Lambert-St Louis

Wed 9/30

10:45 am-9:10 pm

2 stops9h 25m

$475
Cheapest one-way

IslipSt. Louis

ISP Islip Long Island - STL Lambert-St Louis

ISPSTL

Islip Long Island

Wed 10/7

4:20 pm-10:30 pm

1 stop7h 10m

$122

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 19 resultsSorted by cheapest first
1
2

See travel insights to St. Louis from

How to get the cheapest flight ticket from Islip, New York 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 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 $388. 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 Monday because tickets tend to average around $498. 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 Islip, New York in the evening is the least expensive time of day to depart. momondo users have found prices as low as $404 when looking at flights departing in the evening. At noon is when there is more demand to fly to St. Louis, so prices are often more expensive at around $437 per ticket.

When to book flights from Islip, New York to St. Louis

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

Cheap Islip, New York to St. Louis (ISP to STL) flight deals and tips

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

Best Price Found

$122

Fastest flight time

6h 35m

Direct flights

None
The best one-way flight to St. Louis from Islip, New York in the past 72 hours is $122. The best round-trip flight deal from Islip, New York to St. Louis found on momondo in the last 72 hours is $265.
The fastest flight from Islip, New York to St. Louis takes 6h 35m
There are no direct flights from Islip, New York to St. Louis. There are no popular flight routes from Islip, New York to St. Louis.
Search flight deals

Frequently asked questions about flying from Islip, New York to St. Louis

  • How far is Islip Long Island to Lambert-St Louis by plane?

    There are 912.8 mi between Islip Long Island and Lambert-St Louis. In terms of flight time, this usually takes a little over 6h 35m.

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

    Prices for flights from Islip Long Island Airport to Lambert-St Louis Airport are refreshed on a daily basis.

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

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

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Islip Long Island 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.

  • What is the most popular airline from Islip, New York to St. Louis?

Best airlines flying from Islip, New York to St. Louis

Compare and see reviews for airlines that fly from Islip, New York to St. Louis with momondo
Airline
Rating
Free Cancellation
Price
SouthwestPriceFrom $214Free CancellationRating
8.0
4,190 reviews
Search Southwest 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
Fairview Heights
St. Peters
Maryland Heights
Alton
Collinsville
Florissant
Hermann
Clayton
O'Fallon
Farmington
Fenton
Festus
Edwardsville
Wentzville
Eureka
Litchfield
Grafton
Waterloo

Why use momondo?

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

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

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

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

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

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

Price alerts on flights to St. Louis from Islip are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

An easier way to manage your St. Louis trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Tue 10/13
Tue 10/20
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to the United States