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Cheap flights from St. Louis to Islip (STL - ISP) from $184

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 6/6. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
STL — ISP
May 13 — May 201
From?
To?
Mon 5/13
Mon 5/20
1 adult, Economy
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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 58 days in advance, which can save you up to 185% on flights from St. Louis to Islip, New York compared to booking the week you need them. Waiting 58 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 $290. For sooner than that we have options available in the next 3 days from $562.

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

Due to multiple factors, expect to potentially pay more when booking in June. For low rates, September can be a great choice for travel to Islip, New York. Flights to Islip, New York from St. Louis in September are about $310 on average during September, but can be found for as low as $129.

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.

Cheap Frontier flights from St. Louis to Islip

Explore cheap flight options specifically provided by Frontier for the route between St. Louis and Islip. Find affordable fares and compare prices with other airlines to secure the best deal for your journey. Over the last 7 days, Cheapflights users made 2,752,338 searches. Data last updated May 8, 2024.
Thu 6/67:44 pmSTL - ISP
1 stop10h 56mFrontier
Sat 6/154:46 pmISP - STL
1 stop15h 21mFrontier
Deal found 5/7$184
Sun 7/146:42 pmSTL - ISP
1 stop12h 44mFrontier
Thu 7/1810:22 pmISP - STL
1 stop9h 40mFrontier
Deal found 5/7$230
Fri 6/147:44 pmSTL - ISP
1 stop10h 56mFrontier
Mon 6/174:46 pmISP - STL
1 stop15h 21mFrontier
Deal found 5/8$235
Sat 6/812:13 pmSTL - ISP
1 stop18h 27mFrontier
Sat 6/154:46 pmISP - STL
1 stop15h 21mFrontier
Deal found 5/7$242
Sat 6/2912:13 pmSTL - ISP
1 stop18h 27mFrontier
Thu 7/410:23 pmISP - STL
1 stop9h 39mFrontier
Deal found 5/7$309

Cheap St. Louis to Islip flights in May & June 2024

Find cheap flight options from St. Louis to Islip specifically for the months of May and June 2024. Explore affordable fares based on user searches. Over the last 7 days, Cheapflights users made 2,752,338 searches. Prices were last updated on May 8, 2024.
Thu 6/67:44 pmSTL - ISP
1 stop10h 56mFrontier
Sat 6/154:46 pmISP - STL
1 stop15h 21mFrontier
Deal found 5/7$184
Fri 6/147:44 pmSTL - ISP
1 stop10h 56mFrontier
Mon 6/174:46 pmISP - STL
1 stop15h 21mFrontier
Deal found 5/8$235
Sat 6/812:13 pmSTL - ISP
1 stop18h 27mFrontier
Sat 6/154:46 pmISP - STL
1 stop15h 21mFrontier
Deal found 5/7$242
Mon 5/209:26 pmSTL - ISP
1 stop9h 47mFrontier
Thu 5/238:27 pmISP - STL
1 stop11h 41mFrontier
Deal found 5/8$284
Sat 6/2912:13 pmSTL - ISP
1 stop18h 27mFrontier
Thu 7/410:23 pmISP - STL
1 stop9h 39mFrontier
Deal found 5/7$309
Sat 6/296:22 pmSTL - ISP
2 stops17h 03mMultiple Airlines
Thu 7/42:05 pmISP - STL
3 stops25h 11mMultiple Airlines
Deal found 5/7$654
Sat 6/2911:34 amSTL - ISP
3 stops23h 51mMultiple Airlines
Thu 7/42:05 pmISP - STL
3 stops25h 11mMultiple Airlines
Deal found 5/7$677

St. Louis to Islip 2024 flight deals

Discover exclusive flight deals for travel between St. Louis and Islip in 2024. Find excellent offers based on user searches. Over the last 7 days, Cheapflights users made 2,752,338 searches. Data last updated May 8, 2024.
Thu 6/67:44 pmSTL - ISP
1 stop10h 56mFrontier
Sat 6/154:46 pmISP - STL
1 stop15h 21mFrontier
Deal found 5/7$184
Sun 7/146:42 pmSTL - ISP
1 stop12h 44mFrontier
Thu 7/1810:22 pmISP - STL
1 stop9h 40mFrontier
Deal found 5/7$230
Fri 6/147:44 pmSTL - ISP
1 stop10h 56mFrontier
Mon 6/174:46 pmISP - STL
1 stop15h 21mFrontier
Deal found 5/8$235
Sat 6/812:13 pmSTL - ISP
1 stop18h 27mFrontier
Sat 6/154:46 pmISP - STL
1 stop15h 21mFrontier
Deal found 5/7$242
Mon 5/209:26 pmSTL - ISP
1 stop9h 47mFrontier
Thu 5/238:27 pmISP - STL
1 stop11h 41mFrontier
Deal found 5/8$284
Sat 6/2912:13 pmSTL - ISP
1 stop18h 27mFrontier
Thu 7/410:23 pmISP - STL
1 stop9h 39mFrontier
Deal found 5/7$309
Sat 6/296:22 pmSTL - ISP
2 stops17h 03mMultiple Airlines
Thu 7/42:05 pmISP - STL
3 stops25h 11mMultiple Airlines
Deal found 5/7$654
Sat 6/2911:34 amSTL - ISP
3 stops23h 51mMultiple Airlines
Thu 7/42:05 pmISP - STL
3 stops25h 11mMultiple Airlines
Deal found 5/7$677

Find flights from St. Louis to Islip within your budget

Customize your flight search to find flights from St. Louis to Islip that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,752,338 searches. Data last updated May 8, 2024.

Fly from

Any airport

Fly to

Any airport

Budget

$184 - $677

Route

Depart

Return

Price

Lambert-St LouisIslip Long Island

STL - ISP

STLISP

Lambert-St Louis

Thu 6/6

1 stop10h 56m

Islip Long Island

Sat 6/15

1 stop15h 21m

$184

Lambert-St LouisIslip Long Island

STL - ISP

STLISP

Lambert-St Louis

Sun 7/14

1 stop12h 44m

Islip Long Island

Thu 7/18

1 stop9h 40m

$230

Lambert-St LouisIslip Long Island

STL - ISP

STLISP

Lambert-St Louis

Fri 6/14

1 stop10h 56m

Islip Long Island

Mon 6/17

1 stop15h 21m

$235

Lambert-St LouisIslip Long Island

STL - ISP

STLISP

Lambert-St Louis

Sat 6/8

1 stop18h 27m

Islip Long Island

Sat 6/15

1 stop15h 21m

$242

Lambert-St LouisIslip Long Island

STL - ISP

STLISP

Lambert-St Louis

Sat 6/29

1 stop18h 27m

Islip Long Island

Thu 7/4

1 stop9h 39m

$309

Lambert-St LouisIslip Long Island

STL - ISP

STLISP

Lambert-St Louis

Sat 6/29

2 stops17h 03m

Islip Long Island

Thu 7/4

3 stops25h 11m

$654

Lambert-St LouisIslip Long Island

STL - ISP

STLISP

Lambert-St Louis

Sat 6/29

3 stops23h 51m

Islip Long Island

Thu 7/4

3 stops25h 11m

$677

Flights are sorted by cheapest first

Deals found on 5/7

When is the cheapest time to fly from St. Louis to Islip, New York?

Use this chart to determine the cheapest time to fly round-trip from St. Louis to Islip. Price data was last updated on May 5, 2024.
Morning
Noon
Afternoon
Evening
All times are departure.
Travelers seeking maximum savings on their St. Louis to Islip, New York flight should consider departing on Saturday evenings when fares are most often at their lowest. Saturday evenings flights should be avoided if possible as fares are typically the most expensive at this time.
Search Deals

Reviews of airlines servicing Islip

Get insights into the airlines that provide service to Islip. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Islip. Reviews last updated May 8, 2024.
Frontier
6.3
Okay
4,088 reviews
Check prices

Crew

7.1

Comfort

5.8

Food

5.2

Boarding

6.6

Overall

6.3

Entertainment

4.9

Reviews

1 / 10

Check-in experience left a LOT to be desired. I had tried to check in online but couldn't figure out how to navigate the required steps. So, we got to the airport in plenty of time to check in at the counter. But once there (and my friend and I were the ONLY people at the counter at that time) the counter agents--all four of them--seemed to have difficulty in getting us our boarding passes. AND, they charged us $25 apiece for doing it. We were not at all happy about this.

Frontier
6.3
Okay
4,088 reviews
Frontier
6.3
Okay
4,088 reviews
Check prices

Crew

7.1

Comfort

5.8

Food

5.2

Boarding

6.6

Overall

6.3

Entertainment

4.9

Reviews

1 / 10

Check-in experience left a LOT to be desired. I had tried to check in online but couldn't figure out how to navigate the required steps. So, we got to the airport in plenty of time to check in at the counter. But once there (and my friend and I were the ONLY people at the counter at that time) the counter agents--all four of them--seemed to have difficulty in getting us our boarding passes. AND, they charged us $25 apiece for doing it. We were not at all happy about this.

Related info for your journey

Find useful and relevant information for your journey from St. Louis to Islip. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • Can I find flights from St. Louis to Islip, New York for under $200 on Cheapflights?

    Yes, there are multiple flights from St. Louis to Islip, New York for under $200. The cheapest flight booked recently is on Frontier for just $184, but on average you can expect to pay $361.

  • What does STL to ISP mean?

    Lambert-St Louis Airport is STL and Islip Long Island Airport is ISP. These codes are created by the International Air Transport Association (IATA) and airlines use them to identify the departing and arrival airports in the flight routes they service.

  • Can I find deals for flights from St. Louis to Islip that include extra baggage allowance?

    The amount of baggage you can bring on your St. Louis to Islip flight depends on the airline and the type of fare you've chosen. After entering your flight details, you'll be able to view the specific baggage policies for each deal in the search results. Keep in mind that certain deals may offer additional baggage allowance.

  • Can I find deals on flights from St. Louis to Islip with specific airlines?

    Yes, Cheapflights allows you to browse and filter St. Louis to Islip flight deals by airline. After entering your origin and destination, use the available filters to view flights offered by airlines.

  • Can I find deals for flights from St. Louis to Islip that include hotel bookings?

    Yes. In addition to deals on St. Louis to Islip flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from St. Louis to Islip?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from St. Louis to Islip.

  • Can I find deals for business class flights from St. Louis to Islip?

    Yes. Cheapflights offers flight deals from St. Louis to Islip by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • Can I find deals for flights from St. Louis to Islip that allow pets onboard?

    Many airlines flying from St. Louis to Islip offer the option to travel with pets. After selecting a flight deal, you can find more information about the airline's pet policy on their official website or by contacting the airline directly. Please note that additional fees and restrictions may apply.

  • Can I find deals on last-minute flights from St. Louis to Islip?

    Yes, you can often find last-minute deals on St. Louis to Islip flights on Cheapflights. However, these deals can vary and may not always be available. We recommend checking back frequently or signing up for price alerts for the most up-to-date deals.

  • How recently were the St. Louis to Islip, New York flight deals updated?

    The St. Louis to Islip, New York flight deals you see on this page were last updated on 5/8.

See more FAQs

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Search flights from St. Louis to Islip by cabin class

Find flights from St. Louis to Islip, based on your preferred cabin class, be it economy, premium economy, business, or first class.
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Fly with Cheapflights

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How does Cheapflights help users find flights from St. Louis to Islip?

When you search for this flight from St. Louis to Islip, Cheapflights searches on 900+ travel sites to save you time finding great flight deals online. Additionally, we offer filter features so you can choose a preferred cabin class or airline, see different price ranges, and much more so you can book the flight for you.

Why should you use Cheapflights to find cheap flight tickets from St. Louis to Islip?

Cheapflights helps you find that perfect flight to Islip from St. Louis by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

Can Cheapflights find flights from St. Louis to Islip with no change fees?

Certainly. Search results for flights to Islip from St. Louis shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

Can Cheapflights notify me if prices for flights from St. Louis to Islip become cheaper?

Yes! Start tracking prices for St. Louis to Islip flights today and get alerted whenever prices for these flights change. To access this feature, click the bell icon next to the flight deals above, which will prompt you for a valid email address to receive your alerts.

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