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$113+ Cheap flights from Islip to Buffalo (ISP - BUF)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/27. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — BUF
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
1 adult, Economy
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Cheap flight deals from Islip to Buffalo

Discover tips and strategies to find the most affordable flight options for your journey from Islip (ISP) to Buffalo (BUF). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated September 11, 2025.

Round-trip from

$172
(Booking.com)

One-way from

$113
(Kiwi.com)

Popular in

December

Cheapest in

September

Average price

$177
From Islip Long Island to Buffalo
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One-way flight from Islip Long Island to Buffalo
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Highest demand for flights based on searches. 26% potential increase in price ($132 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($16 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Find flight deals from Islip to Buffalo

Cheapest flights from Islip to Buffalo
Explore the most affordable flight options available from Islip to Buffalo. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 11, 2025.

This Booking.com deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/239:37 pmISP - BUF
1 stop22h 41mFrontier
Thu 10/309:04 pmBUF - ISP
1 stop12h 05mFrontier
Deal found 9/10$177
This Southwest deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/75:50 amISP - BUF
1 stop6h 10mSouthwest
Mon 11/105:45 amBUF - ISP
1 stop7h 05mSouthwest
Deal found 9/11$255
This Southwest deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/105:55 amISP - BUF
1 stop12h 00mSouthwest
Sun 10/128:00 amBUF - ISP
1 stop4h 10mSouthwest
Deal found 9/11$266
This Southwest deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/1811:55 amISP - BUF
1 stop4h 25mSouthwest
Mon 10/205:45 amBUF - ISP
1 stop6h 05mSouthwest
Deal found 9/11$282
This Southwest deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/273:40 pmISP - BUF
1 stop6h 00mSouthwest
Sun 9/285:45 amBUF - ISP
1 stop6h 45mSouthwest
Deal found 9/11$306
This Kiwi.com deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/205:05 pmISP - BUF
2 stops18h 17mFrontier
Thu 9/257:41 pmBUF - ISP
1 stop14h 59mFrontier
Deal found 9/10$309
This Trip.com deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/14:58 pmISP - BUF
1 stop26h 06mFrontier
Mon 11/39:53 pmBUF - ISP
1 stop19h 49mFrontier
Deal found 9/11$321
This Booking.com deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/104:58 pmISP - BUF
1 stop24h 59mFrontier
Mon 10/139:13 pmBUF - ISP
1 stop23h 29mFrontier
Deal found 9/11$325

Cheapflights Fare Finder

 
Customize your flight search to find flights from Islip to Buffalo 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 2,558,603 searches. Data last updated September 11, 2025.
Use the filters below to find and compare flights from Islip to Buffalo that are best for you.

Fly from

Islip

Fly to

Buffalo

Route

Depart

Return

Price

IslipBuffalo

ISP - BUF

ISPBUF

Islip Long Island

Thu 10/23

9:37 pm-8:18 pm

1 stop22h 41m

Buffalo

Thu 10/30

9:04 pm-9:09 am

1 stop12h 05m

$177

IslipBuffalo

ISP - BUF

ISPBUF

Islip Long Island

Fri 11/7

5:50 am-12:00 pm

1 stop6h 10m

Buffalo

Mon 11/10

5:45 am-12:50 pm

1 stop7h 05m

$255

IslipBuffalo

ISP - BUF

ISPBUF

Islip Long Island

Fri 10/10

5:55 am-5:55 pm

1 stop12h 00m

Buffalo

Sun 10/12

8:00 am-12:10 pm

1 stop4h 10m

$266

IslipBuffalo

ISP - BUF

ISPBUF

Islip Long Island

Sat 10/18

11:55 am-4:20 pm

1 stop4h 25m

Buffalo

Mon 10/20

5:45 am-11:50 am

1 stop6h 05m

$282

IslipBuffalo

ISP - BUF

ISPBUF

Islip Long Island

Sat 9/27

3:40 pm-9:40 pm

1 stop6h 00m

Buffalo

Sun 9/28

5:45 am-12:30 pm

1 stop6h 45m

$306

IslipBuffalo

ISP - BUF

ISPBUF

Islip Long Island

Mon 11/3

1:57 pm-10:27 pm

1 stop8h 30m

Buffalo

Sat 11/22

9:02 am-6:01 pm

1 stop8h 59m

$336

IslipBuffalo

ISP - BUF

ISPBUF

Islip Long Island

Fri 10/10

4:58 pm-5:57 pm

1 stop24h 59m

Buffalo

Mon 10/13

9:13 pm-8:42 pm

1 stop23h 29m

$350

IslipBuffalo

ISP - BUF

ISPBUF

Islip Long Island

Sat 10/11

11:55 am-4:20 pm

1 stop4h 25m

Buffalo

Mon 10/20

5:45 am-11:50 am

1 stop6h 05m

$351

IslipBuffalo

ISP - BUF

ISPBUF

Islip Long Island

Sat 9/27

5:05 pm-5:22 pm

1 stop24h 17m

$113

IslipBuffalo

ISP - BUF

ISPBUF

Islip Long Island

Sat 10/4

11:55 am-4:20 pm

1 stop4h 25m

$151

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/10

Showing 1-10 of 18 results
1
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Best time to book a flight from Islip to Buffalo

Have a flexible travel schedule? Discover the best time to fly to Buffalo from Islip with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Islip to Buffalo

What is the cheapest month to book a flight from Islip to Buffalo?

Currently, January is the cheapest month in which you can book a flight from Islip to Buffalo (average of $256). Flying from Islip to Buffalo in December is currently the most expensive (average of $337). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from ISP to BUF?

Find hourly flight availability from Islip to Buffalo. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 11, 2025.

It’s typically best to fly out from Islip to Buffalo in the morning. Doing so could potentially save you 15% on the flight price compared to flying at noon, which is usually more expensive.

How much does it cost to fly round-trip from Islip to Buffalo?

Reviews of airlines servicing Buffalo

Get insights into the airlines that provide service to Buffalo. 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 Buffalo. Reviews last updated September 11, 2025.
Read through reviews of airlines operating flights from Islip to Buffalo, such as Southwest. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,248 reviews

Comfort

8.0

Entertainment

7.5

Overall

8.0

Food

7.0

Crew

8.6

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Southwest
8.0
Very good
4,248 reviews
Southwest
8.0
Very good
4,248 reviews

Comfort

8.0

Entertainment

7.5

Overall

8.0

Food

7.0

Crew

8.6

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines

Related info for your journey

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

  • How long is the flight from Islip to Buffalo?

    For as low as $255, Frontier can have you in Buffalo from Islip in 6h 10m. Airlines will cover a distance of 325 mi. This flight may include one or multiple stops.

  • What is the cheapest airline to fly from Islip to Buffalo round-trip?

    Southwest, at $213, was found to be the cheapest airline from Islip to Buffalo.. Southwest is currently priced 42% below the average price you’ll pay for this route.

  • What are the cheapest airlines to fly from Islip to Buffalo one-way?

    For one-way options, check prices for Frontier. According to our data, you can fly for as low as $113. Users have also found prices from $151 and $157 on Southwest and JetBlue, respectively.

  • Can I find deals for flights from Islip to Buffalo that include hotel bookings?

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

  • How can I find direct flights from Islip to Buffalo?

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

  • Can I find deals for business class flights from Islip to Buffalo?

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

  • What is the cheapest month to book a flight from Islip to Buffalo?

    Currently, January is the cheapest month in which you can book a flight from Islip to Buffalo (average of $256). Flying from Islip to Buffalo in December is currently the most expensive (average of $337). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near Buffalo?

Book flights to Buffalo if you plan to visit one of these locations
Lockport
Orchard Park
Batavia
Williamsville
Eden
Amherst
West Seneca

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Alternative routes for Islip to Buffalo

See prices for flight routes from nearby airports that may be better suited for you.
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Top airline flying from Islip to Buffalo

Discover the top airline that operate flights from Islip to Buffalo. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated September 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
SouthwestCheapest$213Average$426FlexibilityNo cancel feeOn-time63%

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