Which airports can I use when flying from St. Louis to Islip?

Flights from St. Louis to Islip usually depart from Lambert-St Louis (STL) and arrive at Islip Long Island (ISP).

What cabin classes can I book on flights from St. Louis to Islip?

Only Economy Class is available on flights from St. Louis to Islip.

Which airports do connecting flights from St. Louis to Islip pass through?

Most connecting flights from St. Louis to Islip pass through Baltimore/Washington (BWI), which handles 100% of one-stop traffic on this route.

Can I save money by using flexible dates for flights from St. Louis to Islip?

Yes. Flexible dates can save you up to 53% on flights from St. Louis to Islip. Wednesday is the cheapest departure day at $285 round-trip on average, while Thursday is the most expensive at $597, a difference of $312. KAYAK's flexible dates feature shows options up to 3 days before and after your selected dates, making it easier to compare nearby fares.

How long is a flight from St. Louis to Islip?

A nonstop flight from St. Louis to Islip takes 00m, covering 926 miles.

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

No, a passport is not required for this domestic route, but you will need a real ID-compliant driver's license, a state ID or another TSA-accepted form of identification.

Have flight prices from St. Louis to Islip changed much recently?

Yes. Based on fares seen in the past 5 days, round-trip prices on this route varied from about $461 to $714. That means the highest observed fare was about 54% higher than the lowest one.

How are flight prices from St. Louis to Islip looking right now?

One-way fares from St. Louis to Islip are currently higher than usual. Average one-way flight prices are about $289, which is 48% above the typical average for this route.

What is the time difference between St. Louis and Islip?

Islip is 1 hour ahead of St. Louis (Eastern Time vs Central Time). Plan for the time shift when scheduling connections or first-day activities.

What car rental options are available at Islip Long Island Airport (ISP)?

Islip Long Island Airport (ISP) hosts 5 major car rental companies, with daily rates averaging $105 for economy cars. Top options include: • Budget • Enterprise Rent-A-Car • Avis • National • Empire Rent A Car

How much should I expect to pay for a St. Louis to Islip flight?

Round-trip flights from St. Louis to Islip range from $285 to $540, with an average of $403 over the past 12 months. Anything below $285 counts as a good deal.

How much is a round-trip flight from St. Louis to Islip?

Round-trip flights from St. Louis to Islip typically range from $285 to $540. The lowest price found in the past 5 days was $461, on Southwest.

Which airline is the cheapest to fly from St. Louis to Islip?

Southwest ($461) offered the cheapest round-trip ticket from St. Louis to Islip in the last 5 days.

What is the cheapest layover airport when flying from St. Louis to Islip?

Flights via Baltimore/Washington (BWI) offer the most affordable fares, with an average round-trip price of $400. Based on KAYAK data over the past 3 months.

When flying from St. Louis to Islip which airport offers the shortest layover?

Baltimore/Washington (BWI) had the shortest average connection time for St. Louis to Islip layovers at 3h 36m over the past 3 months.

$171 CHEAP FLIGHTS from St. Louis to Islip (STL - ISP)

Save 25% or more on flights. Compare deals from all over the web.

Never overpay with our price tracking tools.

Filter searches by price, airline and more to find your best flights.

Cheapest round-trip

$461

Typical prices: $285-$540

Southwest

Wed 11/14Sun 11/18

STL - ISP • 1 stop

Cheapest one-way

$171

Typical prices: $178-$462

Frontier

Sat 12/22

STL - ISP • 1 stop

Nonstop flights

Not available

There are currently no direct flights between St. Louis and Islip. You'll need to take a connecting flight to reach the destination.

Insights

When to travel

June

Cheapest • 29% price drop

June

Most popular

Good to know

Start a new search

KAYAK searches 100s of sites at once to find you the best travel deals.

We hope you love your trip to Islip!

Flight Deals

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

Discover the best prices for you by selecting your travel dates on KAYAK.

Round-trip

One-way

Last minute

Recent round-trip flight deals from St. Louis to Islip

Sat, Nov 14 - Wed, Nov 18

6:25 am - 12:05 pmSTL Lambert-St Louis-ISP Islip Long Island

4h 40m1 stop Baltimore/Washington

4:05 pm - 10:15 pmISP Islip Long Island-STL Lambert-St Louis

7h 10m1 stop Baltimore/Washington

$461Southwest

Tue, Nov 10 - Sat, Nov 14

6:35 am - 11:45 amSTL Lambert-St Louis-ISP Islip Long Island

4h 10m1 stop Baltimore/Washington

3:00 pm - 10:25 pmISP Islip Long Island-STL Lambert-St Louis

8h 25m1 stop Orlando

$461Southwest

Tue, Nov 10 - Sat, Nov 14

6:20 am - 4:15 pmSTL Lambert-St Louis-ISP Islip Long Island

8h 55m2 stops Chicago Midway Baltimore/Washington

3:00 pm - 10:25 pmISP Islip Long Island-STL Lambert-St Louis

8h 25m1 stop Orlando

$466Southwest

Sat, Nov 14 - Wed, Nov 18

5:00 am - 2:55 pmSTL Lambert-St Louis-ISP Islip Long Island

8h 55m2 stops Orlando Baltimore/Washington

12:30 pm - 6:05 pmISP Islip Long Island-STL Lambert-St Louis

6h 35m1 stop Baltimore/Washington

$466Southwest

Sat, Nov 14 - Wed, Nov 18

5:00 am - 2:55 pmSTL Lambert-St Louis-ISP Islip Long Island

8h 55m2 stops Orlando Baltimore/Washington

12:30 pm - 7:30 pmISP Islip Long Island-STL Lambert-St Louis

8h 00m2 stops Baltimore/Washington Atlanta Hartsfield-Jackson

$471Southwest

Tue, Nov 10 - Sat, Nov 14

12:35 pm - 9:45 pmSTL Lambert-St Louis-ISP Islip Long Island

8h 10m2 stops Orlando Baltimore/Washington

6:00 am - 2:10 pmISP Islip Long Island-STL Lambert-St Louis

9h 10m2 stops Baltimore/Washington Atlanta Hartsfield-Jackson

$471Southwest

Tue, Nov 10 - Sun, Nov 15

6:35 am - 11:45 amSTL Lambert-St Louis-ISP Islip Long Island

4h 10m1 stop Baltimore/Washington

5:40 pm - 12:10 amISP Islip Long Island-STL Lambert-St Louis

7h 30m1 stop Baltimore/Washington

$635Southwest

Tue, Nov 10 - Sun, Nov 15

5:30 am - 4:15 pmSTL Lambert-St Louis-ISP Islip Long Island

9h 45m2 stops Dallas Love Field Baltimore/Washington

5:40 pm - 12:10 amISP Islip Long Island-STL Lambert-St Louis

7h 30m1 stop Baltimore/Washington

$640Southwest

Tue, Nov 10 - Sun, Nov 15

2:20 pm - 9:45 pmSTL Lambert-St Louis-ISP Islip Long Island

6h 25m2 stops Atlanta Hartsfield-Jackson Baltimore/Washington

12:25 pm - 9:00 pmISP Islip Long Island-STL Lambert-St Louis

9h 35m2 stops Baltimore/Washington Raleigh-Durham

$714Southwest

Booking Insights

Price, demand and travel trends for St. Louis to Islip flights

Use KAYAK data on prices, travel dates, airlines and seasonal trends to compare options and book flights with more confidence.

Prices

Airlines

Layovers

How much is a round-trip flight from St. Louis to Islip? This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from St. Louis to Islip departing in november.

Find deals

High season	June
Cheapest flight	$171

The most popular month to fly with an average 44% increase in travelers.

One-way flight from St. Louis to Islip

When to book flights from St. Louis to Islip

Are your dates flexible? Find out the best times to travel from St. Louis to Islip based on our flight data from the last year. Discover the cheapest month and even day to fly.

Estimated round-trip price

KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

What cabin classes can I book on flights from St. Louis to Islip?
Only Economy Class is available on flights from St. Louis to Islip.
How long is a flight from St. Louis to Islip?
A nonstop flight from St. Louis to Islip takes 00m, covering 926 miles.
Do I need a passport to fly from St. Louis to Islip?
No, a passport is not required for this domestic route, but you will need a real ID-compliant driver's license, a state ID or another TSA-accepted form of identification.
How much should I expect to pay for a St. Louis to Islip flight?
Round-trip flights from St. Louis to Islip range from $285 to $540, with an average of $403 over the past 12 months. Anything below $285 counts as a good deal.
Have flight prices from St. Louis to Islip changed much recently?
Yes. Based on fares seen in the past 5 days, round-trip prices on this route varied from about $461 to $714. That means the highest observed fare was about 54% higher than the lowest one.
How are flight prices from St. Louis to Islip looking right now?
One-way fares from St. Louis to Islip are currently higher than usual. Average one-way flight prices are about $289, which is 48% above the typical average for this route.
What car rental options are available at Islip Long Island Airport (ISP)?
Islip Long Island Airport (ISP) hosts 5 major car rental companies, with daily rates averaging $105 for economy cars. Top options include:

• Budget
• Enterprise Rent-A-Car
• Avis
• National
• Empire Rent A Car
Which airports can I use when flying from St. Louis to Islip?
Flights from St. Louis to Islip usually depart from Lambert-St Louis (STL) and arrive at Islip Long Island (ISP).
Which airports do connecting flights from St. Louis to Islip pass through?
Most connecting flights from St. Louis to Islip pass through Baltimore/Washington (BWI), which handles 100% of one-stop traffic on this route.
Can I save money by using flexible dates for flights from St. Louis to Islip?
Yes. Flexible dates can save you up to 53% on flights from St. Louis to Islip. Wednesday is the cheapest departure day at $285 round-trip on average, while Thursday is the most expensive at $597, a difference of $312.

KAYAK's flexible dates feature shows options up to 3 days before and after your selected dates, making it easier to compare nearby fares.
What is the time difference between St. Louis and Islip?
Islip is 1 hour ahead of St. Louis (Eastern Time vs Central Time). Plan for the time shift when scheduling connections or first-day activities.

If your dates are flexible, aim for a Wednesday departure and avoid flying on Thursday. On this route, Wednesday flights average $285, about $312 less than Thursday fares (52% savings) based on the last 12 months.
If you can choose when to travel, plan your St. Louis to Islip trip for June. Fares historically average $285 round-trip in that month - typically $413 less than the most expensive month, which is May (based on the last 12 months).

More options for your flight from St. Louis to Islip

Add a hotel or car rental

Airports

Cabin class

Direct Flights

Origins

Other destinations

Return flight

Complete your trip to Islip with a hotel stay or car rental

Car rentals in Islip

Hotels in Islip

STL - ISP

$171 Find Cheap Flights from St. Louis to Islip - Compare and Save

Everything you should know

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

Recent round-trip flight deals from St. Louis to Islip

Recent one-way flight deals from St. Louis to Islip

Recent last minute flight deals from St. Louis to Islip

Price, demand and travel trends for St. Louis to Islip flights

How much is a round-trip flight from St. Louis to Islip?

Which airline is the cheapest to fly from St. Louis to Islip?

What is the cheapest layover airport when flying from St. Louis to Islip?

When flying from St. Louis to Islip which airport offers the shortest layover?

Key details for St. Louis to Islip flights

High season

Cheapest flight

When to book flights from St. Louis to Islip

Your St. Louis to Islip flight questions, answered

Your guide to booking St. Louis to Islip flights

More options for your flight from St. Louis to Islip

Complete your trip to Islip with a hotel stay or car rental

Information on your arrival and departure airports

Cabin class types available on flights from St. Louis to Islip

Find direct flights to and from St. Louis and Islip

Flights from domestic origins to Islip

Flights to other popular destinations

Find deals for your return flight