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Cheap flights from Islip, New York to St. Louis from $80

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Islip, New York to St. Louis departing on 12/9. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags
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Find the cheapest flights from Islip, New York to St. Louis

Cheap round-trip flights

These are some of the best round-trip flight deals from Islip, New York to St. Louis that have been recently found on momondo from popular airlines, departing in the coming months.

Cheap one-way flights

Flying one-way? These are some of the best deals recently discovered on momondo for flights from Islip, New York to St. Louis.

Cheap last minute flights

Planning a quick getaway from Islip, New York to St. Louis? These are the last-minute flight deals available now.

Cheap direct flights

If you prefer a non-stop journey, check out our latest direct flight deals to St. Louis, so you can enjoy a seamless trip without layovers.

Cheap bus & train deals from Islip, New York to St. Louis

Find recent round-trip train or bus tickets from Islip, New York to St. Louis.

All round-trip flight deals to St. Louis

The cheapest plane tickets to St. Louis found on KAYAK recently.
12:43 pm - 11:33 pmISP-STL
11h 50m1 stop
11:45 am - 8:38 pmSTL-ISP
7h 53m1 stop
$108Frontier
Find Deal
Mon, Dec 16 - Wed, Dec 18
12:43 pm - 11:27 pmISP-STL
11h 44m1 stop
8:12 am - 7:02 pmSTL-ISP
9h 50m1 stop
$264Frontier
Find Deal
Fri, Jan 10 - Sun, Jan 12
12:43 pm - 11:24 pmISP-STL
11h 41m1 stop
9:15 am - 7:02 pmSTL-ISP
8h 47m1 stop
$318Frontier
Find Deal
Fri, Dec 13 - Mon, Dec 16
11:31 am - 11:28 pmISP-STL
12h 57m1 stop
3:53 pm - 5:43 pmSTL-ISP
24h 50m1 stop
$898Frontier
Find Deal
Thu, Dec 26 - Wed, Jan 1
12:43 pm - 11:24 pmISP-STL
11h 41m1 stop
$80Frontier
Find Deal
Mon, Dec 9
12:43 pm - 11:24 pmISP-STL
11h 41m1 stop
$90Frontier
Find Deal
Sun, Dec 8
12:43 pm - 11:24 pmISP-STL
11h 41m1 stop
$140Frontier
Find Deal
Fri, Dec 6
9:38 pm - 6:43 amISP-STL
10h 05m1 stop
$155Frontier
Find Deal
Sun, Jan 5

Frontier flights from Islip, New York to St. Louis

Our best Frontier deals on Islip, New York to St. Louis flight tickets
Frontier
Dec 16
ISP12:43 pmIslip Long Island
11h 50m
1 stop
STL11:33 pmLambert-St Louis
Dec 18
STL11:45 amLambert-St Louis
7h 53m
1 stop
ISP8:38 pmIslip Long Island
Frontier
Jan 10
ISP12:43 pmIslip Long Island
11h 44m
1 stop
STL11:27 pmLambert-St Louis
Jan 12
STL8:12 amLambert-St Louis
9h 50m
1 stop
ISP7:02 pmIslip Long Island
Frontier
Dec 13
ISP12:43 pmIslip Long Island
11h 41m
1 stop
STL11:24 pmLambert-St Louis
Dec 16
STL9:15 amLambert-St Louis
8h 47m
1 stop
ISP7:02 pmIslip Long Island

Southwest flights from Islip, New York to St. Louis

Our best Southwest deals on Islip, New York to St. Louis flight tickets
Southwest
Nov 25
ISP10:05 amIslip Long Island
8h 30m
1 stop
STL5:35 pmLambert-St Louis
Nov 26
STL10:50 amLambert-St Louis
7h 25m
1 stop
ISP7:15 pmIslip Long Island
Southwest
Nov 25
ISP5:25 pmIslip Long Island
6h 45m
1 stop
STL11:10 pmLambert-St Louis
Nov 26
STL7:45 amLambert-St Louis
9h 35m
2 stops
ISP6:20 pmIslip Long Island

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 month to fly to St. Louis?

In general, January is the cheapest month to fly from Islip, New York to St. Louis. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $303. The month of February is another great option to travel to St. Louis, with average flight prices from Islip, New York averaging around $306.

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 Tuesday when prices can be found for as low as $327. 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 Sunday because tickets tend to average around $433. 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 $348 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 $371 per ticket.

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

The best time to book a flight to St. Louis from Islip, New York is 55 days out, which is when prices tend to be around $346. In the past 72 hours, momondo users found flights from Islip, New York to St. Louis for as low as $258.

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

$80

Fastest flight time

10h 05m

Direct flights

None

Airports in St. Louis

1 airport
The best one-way flight to St. Louis from Islip, New York in the past 72 hours is $80. The best round-trip flight deal from Islip, New York to St. Louis found on momondo in the last 72 hours is $108.
The fastest flight from Islip, New York to St. Louis takes 10h 05m
There are no direct flights from Islip, New York to St. Louis. Popular non-direct route for this connection is Islip Long Island Airport - Lambert-St Louis Airport.
There is 1 airport near St. Louis: Lambert-St Louis (STL)

  • 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 11h 41m.

  • 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 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.


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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