Cheap flights from St. Louis to Islip (STL - ISP)

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How to find the cheapest flight from
St. Louis (STL) to Islip (ISP)

All the information you need to plan the best STL to ISP flight in 2022: compare St. Louis to Islip flight prices with the expected peak season, weather and rainfall in Islip.
How far in advance should I book a flight from St. Louis to Islip, New York?

When searching for a good deal, it’s best to be prepared for potential fluctuations in price. We recommend booking at least 32 days in advance, which can save you up to 58% on flights from St. Louis to Islip, New York compared to booking the week you need them. Waiting 32 days out may not be for everyone, so we have options available for flights within the next two weeks, with the lowest price starting at $311. For sooner than that we have options available in the next 3 days from $450.

When is the cheapest time to fly from St. Louis to Islip, New York (STL - ISP)?

When flying from St. Louis to Islip, New York, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

What is the cheapest day to fly round-trip from St. Louis to Islip, New York?

Departing on a Monday is a good option for securing a great price. You can expect to save up to 38% when planning your travel around this day of the week.

Cheap flights from St. Louis to Islip in June, July 2022

The best prices found for STL to ISP flights for June, July
22 Jul - 26 Jul
$356pp
STL
Lambert-St Louis
American Airlines
 
1 STOP
ISP
Islip Long Island
ISP
Islip Long Island
American Airlines
 
1 STOP
STL
Lambert-St Louis
27 Jul - 30 Jul
$359pp
STL
Lambert-St Louis
American Airlines
 
1 STOP
ISP
Islip Long Island
ISP
Islip Long Island
American Airlines
   
2 STOPS
STL
Lambert-St Louis
22 Jul - 26 Jul
$360pp
STL
Lambert-St Louis
American Airlines
 
1 STOP
ISP
Islip Long Island
ISP
Islip Long Island
American Airlines
   
2 STOPS
STL
Lambert-St Louis

Lambert-St Louis to Islip 2022 flight deals

Cheap flights to Islip from St. Louis found for this year
25 Aug - 28 Aug
$301pp
STL
Lambert-St Louis
Multiple Airlines
   
2 STOPS
ISP
Islip Long Island
ISP
Islip Long Island
Frontier
 
1 STOP
STL
Lambert-St Louis
25 Aug - 28 Aug
$328pp
STL
Lambert-St Louis
Multiple Airlines
 
1 STOP
ISP
Islip Long Island
ISP
Islip Long Island
Multiple Airlines
 
1 STOP
STL
Lambert-St Louis
26 Aug - 6 Sep
$343pp
STL
Lambert-St Louis
American Airlines
   
2 STOPS
ISP
Islip Long Island
ISP
Islip Long Island
American Airlines
   
2 STOPS
STL
Lambert-St Louis

Last minute flights from St. Louis to Islip

Late deals on round-trip flights to Islip from St. Louis, departing today and this week
5 Jul - 10 Jul
$517pp
STL
Lambert-St Louis
American Airlines
 
1 STOP
ISP
Islip Long Island
ISP
Islip Long Island
American Airlines
 
1 STOP
STL
Lambert-St Louis
5 Jul - 10 Jul
$520pp
STL
Lambert-St Louis
American Airlines
   
2 STOPS
ISP
Islip Long Island
ISP
Islip Long Island
American Airlines
 
1 STOP
STL
Lambert-St Louis
5 Jul - 10 Jul
$523pp
STL
Lambert-St Louis
American Airlines
   
2 STOPS
ISP
Islip Long Island
ISP
Islip Long Island
American Airlines
   
2 STOPS
STL
Lambert-St Louis

One-way flights to Long Island from St. Louis

The cheapest one-way flights from St. Louis to Islip
2:26 am - 5:57 pm
American Airlines
1 Stop
14h 31m
STL - ISP
American Airlines
2:26 am - 5:57 pm
American Airlines
1 Stop
14h 31m
STL - ISP
American Airlines
2:26 am - 5:57 pm
American Airlines
1 Stop
14h 31m
STL - ISP
American Airlines

Related info for your journey

Useful info, stats and facts about <span class="emphasized">St. Louis</span> to <span class="emphasized">Islip</span> flights.

Flight FAQs

From St. Louis to Islip

Which airlines flying from Lambert-St Louis to Islip Long Island have flexible changes due to COVID-19?

Some of our airline partners flying from Lambert-St Louis to Islip Long Island have new flexible policies in place due to COVID-19. American Airlines is one of the carriers where you may find flexible change policies. You can use our site to filter for airlines like American Airlines with this kind of flexibility.

Can I find flights from St. Louis to Islip, New York for under $400 on Cheapflights?

Yes, there are multiple flights from St. Louis to Islip, New York for under $400. The cheapest flight booked recently is on Multiple Airlines for just $301, but on average you can expect to pay $401.

Are there last-minute flights available from St. Louis to Islip, New York for under $600?

There are currently 3+ open flights from St. Louis to Islip, New York within the next 7 days for less than $600.

What are the cheapest flights from St. Louis to Islip, New York?

Looking for the cheapest flight from St. Louis to Islip, New York? While on average our users pay $335, our data indicates the cheapest price to be $181. The most popular route (Lambert-St Louis - Islip Long Island), is priced around $343.

COVID Restrictions

View COVID Travel Restrictions for Islip, NY

Do I need a COVID test to fly to Islip from St. Louis?

Information is based on travel restrictions for travel to Islip Long Island within the United States

Most visitors from Lambert-St Louis need to provide a negative COVID-19 test result and/or quarantine to enter Islip Long Island.

COVID-19 testing requirements
Visitors from Lambert-St Louis are not required to present a negative COVID-19 PCR test or antigen result upon entering Islip Long Island.

Quarantine requirements
Visitors from Lambert-St Louis are not required to quarantine after entering Islip Long Island.

Do I need a test to fly back to St. Louis from Islip?

Returning to Lambert-St Louis from Islip Long Island

COVID-19 testing requirements
Visitors from Islip Long Island are not required to present a negative COVID-19 PCR test or antigen result upon entering Lambert-St Louis.

Quarantine requirements
Visitors from Islip Long Island are not required to quarantine after entering Lambert-St Louis.

Hide COVID Travel Restrictions for Islip, NY

Alternative routes for St. Louis to Islip

See prices for flight routes from nearby airports that may be better suited for you.

Destination information for Islip

Things to know before you go - useful duration and weather info for your trip from St. Louis to Islip.
Average temperature for June in Islip
80.6 °F
Avg rainfall for June in Islip
3.9 ″

Airports servicing St. Louis

Airports servicing Islip

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