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

ISP — STL
Dec 3 — Dec 101

How far in advance should I book a flight from Islip to St. Louis?

To save up to 49% on this flight, we recommend booking at least 29 days prior to travel. The price may fluctuate and will likely increase closer to your departure date. Users on Cheapflights have found tickets from Islip to St. Louis from $365 1-2 weeks out and tickets from $465 for flights departing within the next 72 hours.

What is the cheapest month to fly from Islip to St. Louis?

Due to multiple factors, expect to potentially pay more when booking in June. For low rates, January can be a great choice for travel to St. Louis. Flights to St. Louis from Islip in January are about $313 on average during January, but can be found for as low as $152.

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

Unlike in the morning, when flights are generally more expensive, you can save up to 2% on flights from Islip to St. Louis by exploring options for tickets at noon.

Cheap flights from Islip to St. Louis in November, December 2022

The best prices found for ISP to STL flights for November, December
Dec 20 - Dec 28
ISP

Islip Long Island

STL

Lambert-St Louis

1 stop

7h 47m
STL

Lambert-St Louis

ISP

Islip Long Island

2 stops

44h 30m
$355

Multiple Airlines

Pick Dates

Deal found 11/26

Dec 20 - Dec 28
ISP

Islip Long Island

STL

Lambert-St Louis

1 stop

7h 47m
STL

Lambert-St Louis

ISP

Islip Long Island

1 stop

8h 57m
$362

Multiple Airlines

Pick Dates

Deal found 11/26

Dec 30 - Jan 2
ISP

Islip Long Island

STL

Lambert-St Louis

1 stop

7h 20m
STL

Lambert-St Louis

ISP

Islip Long Island

2 stops

47h 54m
$386

Multiple Airlines

Pick Dates

Deal found 11/27

Islip to St. Louis 2022 flight deals

Cheap flights to St. Louis from Islip found for this year
Dec 20 - Dec 28
ISP

Islip Long Island

STL

Lambert-St Louis

1 stop

7h 47m
STL

Lambert-St Louis

ISP

Islip Long Island

2 stops

44h 30m
$355

Multiple Airlines

Pick Dates

Deal found 11/26

Dec 20 - Dec 28
ISP

Islip Long Island

STL

Lambert-St Louis

1 stop

7h 47m
STL

Lambert-St Louis

ISP

Islip Long Island

1 stop

8h 57m
$362

Multiple Airlines

Pick Dates

Deal found 11/26

Dec 30 - Jan 2
ISP

Islip Long Island

STL

Lambert-St Louis

1 stop

7h 20m
STL

Lambert-St Louis

ISP

Islip Long Island

2 stops

47h 54m
$386

Multiple Airlines

Pick Dates

Deal found 11/27

Cheap Frontier flights from Islip to St. Louis

Dec 21 - Dec 26
ISP

Islip Long Island

STL

Lambert-St Louis

1 stop

28h 59m
STL

Lambert-St Louis

ISP

Islip Long Island

1 stop

11h 45m
$556

Frontier

Pick Dates

Deal found 11/26

Dec 22 - Dec 26
ISP

Islip Long Island

STL

Lambert-St Louis

1 stop

28h 59m
STL

Lambert-St Louis

ISP

Islip Long Island

1 stop

11h 45m
$626

Frontier

Pick Dates

Deal found 11/26

Related info for your journey

Useful info, stats and facts about Islip to St. Louis flights.

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

Some of our airline partners flying from Islip Long Island to Lambert-St Louis 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 Islip to St. Louis for under $300 on Cheapflights?

Yes, there are multiple flights from Islip to St. Louis for under $300. The cheapest flight booked recently is on Multiple Airlines for just $225, but on average you can expect to pay $468.

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

Looking at all options, your cheapest flight can be booked for $284. While the most popular route (Islip Long Island - Lambert-St Louis) can be booked for $225 on average our data indicates $5,483 when flying from Islip to St. Louis.

Alternative routes for Islip to St. Louis

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