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Cheap flights from Islip, New York to St. Louis from $285

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
1:35 pm - 12:05 amISP  Islip Long Island-STL Lambert-St Louis
11h 30m2 stops West Palm Beach President Donald J. Trump Intl Orlando
Southwest Logo
2:20 pm - 9:45 pmSTL  Lambert-St Louis-ISP Islip Long Island
6h 25m2 stops Atlanta Hartsfield-Jackson Baltimore/Washington
$285Southwest
Mon, Nov 2 - Wed, Nov 4
Southwest Logo
1:35 pm - 12:05 amISP  Islip Long Island-STL Lambert-St Louis
11h 30m2 stops West Palm Beach President Donald J. Trump Intl Orlando
Southwest Logo
6:35 am - 4:15 pmSTL  Lambert-St Louis-ISP Islip Long Island
8h 40m1 stop Baltimore/Washington
$285Southwest
Mon, Nov 2 - Wed, Nov 4
Southwest Logo
5:40 pm - 12:05 amISP  Islip Long Island-STL Lambert-St Louis
7h 25m1 stop Baltimore/Washington
Southwest Logo
6:35 am - 4:15 pmSTL  Lambert-St Louis-ISP Islip Long Island
8h 40m1 stop Baltimore/Washington
$344Southwest
Mon, Nov 2 - Wed, Nov 4
Southwest Logo
9:40 am - 7:20 pmISP  Islip Long Island-STL Lambert-St Louis
10h 40m1 stop Baltimore/Washington
Southwest Logo
6:45 am - 11:45 amSTL  Lambert-St Louis-ISP Islip Long Island
4h 00m1 stop Baltimore/Washington
$354Southwest
Wed, Oct 21 - Mon, Oct 26
Southwest Logo
9:40 am - 7:20 pmISP  Islip Long Island-STL Lambert-St Louis
10h 40m1 stop Baltimore/Washington
Southwest Logo
2:30 pm - 11:15 pmSTL  Lambert-St Louis-ISP Islip Long Island
7h 45m2 stops Nashville Intl Orlando
$359Southwest
Wed, Oct 21 - Mon, Oct 26
Frontier Logo
6:25 pm - 5:40 pmISP  Islip Long Island-STL Lambert-St Louis
24h 15m2 stops Orlando Atlanta Hartsfield-Jackson
Frontier Logo
6:35 pm - 5:30 pmSTL  Lambert-St Louis-ISP Islip Long Island
21h 55m2 stops Atlanta Hartsfield-Jackson Orlando
$382Frontier
Sun, Oct 18 - Fri, Oct 23
Multiple Airlines Logo
6:25 pm - 11:13 pmISP  Islip Long Island-STL Lambert-St Louis
29h 48m1 stop Orlando
Multiple Airlines Logo
6:35 pm - 11:20 amSTL  Lambert-St Louis-ISP Islip Long Island
15h 45m2 stops Atlanta Hartsfield-Jackson Raleigh-Durham
$384Multiple Airlines
Sun, Oct 18 - Fri, Oct 23
Southwest Logo
9:40 am - 3:00 pmISP  Islip Long Island-STL Lambert-St Louis
6h 20m2 stops Baltimore/Washington Atlanta Hartsfield-Jackson
Southwest Logo
5:25 am - 2:30 pmSTL  Lambert-St Louis-ISP Islip Long Island
8h 05m2 stops Chicago Midway Baltimore/Washington
$427Southwest
Wed, Oct 21 - Mon, Oct 26
Frontier Logo
6:25 pm - 11:13 pmISP  Islip Long Island-STL Lambert-St Louis
29h 48m1 stop Orlando
Frontier Logo
4:30 pm - 5:30 pmSTL  Lambert-St Louis-ISP Islip Long Island
24h 00m1 stop Orlando
$438Frontier
Sun, Oct 18 - Fri, Oct 23
Southwest Logo
4:20 pm - 10:20 pmISP  Islip Long Island-STL Lambert-St Louis
7h 00m1 stop Orlando
Southwest Logo
9:25 am - 4:10 pmSTL  Lambert-St Louis-ISP Islip Long Island
5h 45m1 stop Baltimore/Washington
$454Southwest
Tue, Oct 13 - Sat, Oct 17

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Frontier flights from Islip, New York to St. Louis

Our best Frontier deals on Islip, New York to St. Louis flight tickets
Frontier
Oct 18
ISP6:25 pmIslip Long Island
24h 15m
2 stops
STL5:40 pmLambert-St Louis
Oct 23
STL6:35 pmLambert-St Louis
21h 55m
2 stops
ISP5:30 pmIslip Long Island
$382
Frontier
Oct 18
ISP6:25 pmIslip Long Island
29h 48m
1 stop
STL11:13 pmLambert-St Louis
Oct 23
STL4:30 pmLambert-St Louis
24h 00m
1 stop
ISP5:30 pmIslip Long Island
$438

Southwest flights from Islip, New York to St. Louis

Our best Southwest deals on Islip, New York to St. Louis flight tickets
Southwest
Nov 2
ISP1:35 pmIslip Long Island
11h 30m
2 stops
STL12:05 amLambert-St Louis
Nov 4
STL2:20 pmLambert-St Louis
6h 25m
2 stops
ISP9:45 pmIslip Long Island
$285
Southwest
Nov 2
ISP5:40 pmIslip Long Island
7h 25m
1 stop
STL12:05 amLambert-St Louis
Nov 4
STL6:35 amLambert-St Louis
8h 40m
1 stop
ISP4:15 pmIslip Long Island
$344
Southwest
Oct 21
ISP9:40 amIslip Long Island
10h 40m
1 stop
STL7:20 pmLambert-St Louis
Oct 26
STL6:45 amLambert-St Louis
4h 00m
1 stop
ISP11:45 amIslip Long Island
$354

momondo Fare Finder

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

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Route

Depart

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Price

Cheapest round-trip

IslipSt. Louis

ISP Islip Long Island - STL Lambert-St Louis

ISPSTL

Islip Long Island

Mon 11/2

1:35 pm-12:05 am

2 stops11h 30m

Lambert-St Louis

Wed 11/4

2:20 pm-9:45 pm

2 stops6h 25m

$285

IslipSt. Louis

ISP Islip Long Island - STL Lambert-St Louis

ISPSTL

Islip Long Island

Mon 11/2

1:35 pm-12:05 am

2 stops11h 30m

Lambert-St Louis

Wed 11/4

6:35 am-4:15 pm

1 stop8h 40m

$285

IslipSt. Louis

ISP Islip Long Island - STL Lambert-St Louis

ISPSTL

Islip Long Island

Mon 11/2

5:40 pm-12:05 am

1 stop7h 25m

Lambert-St Louis

Wed 11/4

6:35 am-4:15 pm

1 stop8h 40m

$344

IslipSt. Louis

ISP Islip Long Island - STL Lambert-St Louis

ISPSTL

Islip Long Island

Wed 10/21

9:40 am-7:20 pm

1 stop10h 40m

Lambert-St Louis

Mon 10/26

6:45 am-11:45 am

1 stop4h 00m

$354

IslipSt. Louis

ISP Islip Long Island - STL Lambert-St Louis

ISPSTL

Islip Long Island

Wed 10/21

9:40 am-7:20 pm

1 stop10h 40m

Lambert-St Louis

Mon 10/26

2:30 pm-11:15 pm

2 stops7h 45m

$359

IslipSt. Louis

ISP Islip Long Island - STL Lambert-St Louis

ISPSTL

Islip Long Island

Sun 10/18

6:25 pm-5:40 pm

2 stops24h 15m

Lambert-St Louis

Fri 10/23

6:35 pm-5:30 pm

2 stops21h 55m

$382

IslipSt. Louis

ISP Islip Long Island - STL Lambert-St Louis

ISPSTL

Islip Long Island

Sun 10/18

6:25 pm-11:13 pm

1 stop29h 48m

Lambert-St Louis

Fri 10/23

6:35 pm-11:20 am

2 stops15h 45m

$384

IslipSt. Louis

ISP Islip Long Island - STL Lambert-St Louis

ISPSTL

Islip Long Island

Wed 10/21

9:40 am-3:00 pm

2 stops6h 20m

Lambert-St Louis

Mon 10/26

5:25 am-2:30 pm

2 stops8h 05m

$427

IslipSt. Louis

ISP Islip Long Island - STL Lambert-St Louis

ISPSTL

Islip Long Island

Sun 10/18

6:25 pm-11:13 pm

1 stop29h 48m

Lambert-St Louis

Fri 10/23

4:30 pm-5:30 pm

1 stop24h 00m

$438
Quickest round-trip

IslipSt. Louis

ISP Islip Long Island - STL Lambert-St Louis

ISPSTL

Islip Long Island

Tue 10/13

4:20 pm-10:20 pm

1 stop7h 00m

Lambert-St Louis

Sat 10/17

9:25 am-4:10 pm

1 stop5h 45m

$454

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 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 Thursday when prices can be found for as low as $393. 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 $505. 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 $410 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 $446 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

$285

Fastest flight time

6h 40m

Direct flights

None
The best flight deal from Islip, New York to St. Louis found on momondo in the last 72 hours is $285
The fastest flight from Islip, New York to St. Louis takes 6h 40m
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 40m.

  • 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
4,212 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
Maryland Heights
St. Peters
Alton
Collinsville
Florissant
Hermann
Farmington
Clayton
Festus
O'Fallon
Fenton
Edwardsville
Eureka
Wentzville
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.

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