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Cheap flights from Islip to Buffalo from $139

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 to Buffalo departing on 12/1. 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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Find the cheapest flights from Islip to Buffalo

Cheap round-trip flights

Southwest Logo
5:40 am - 12:05 pmISP-BUF
6h 25m1 stop
Southwest Logo
3:45 pm - 10:50 pmBUF-ISP
7h 05m1 stop
$171Southwest
Find Deal
Wed, Nov 19 - Sat, Nov 22
Southwest Logo
6:15 am - 2:20 pmISP-BUF
8h 05m2 stops
Southwest Logo
3:45 pm - 10:50 pmBUF-ISP
7h 05m1 stop
$176Southwest
Find Deal
Wed, Nov 19 - Sat, Nov 22
Frontier Logo
9:54 am - 8:53 pmISP-BUF
10h 59m2 stops
Frontier Logo
9:04 pm - 9:09 amBUF-ISP
12h 05m1 stop
$200Frontier
Find Deal
Fri, Oct 31 - Sun, Nov 2
Southwest Logo
11:55 am - 4:20 pmISP-BUF
4h 25m1 stop
Southwest Logo
5:45 am - 11:50 amBUF-ISP
6h 05m1 stop
$215Southwest
Find Deal
Sat, Oct 18 - Mon, Oct 20
Southwest Logo
5:40 am - 12:05 pmISP-BUF
6h 25m1 stop
Southwest Logo
12:40 pm - 10:05 pmBUF-ISP
9h 25m1 stop
$248Southwest
Find Deal
Mon, Nov 3 - Tue, Nov 4
Frontier Logo
9:54 am - 8:53 pmISP-BUF
10h 59m2 stops
Frontier Logo
2:42 pm - 9:09 amBUF-ISP
18h 27m2 stops
$265Frontier
Find Deal
Fri, Oct 31 - Sun, Nov 2
Multiple Airlines Logo
2:25 pm - 9:08 pmISP-BUF
6h 43m1 stop
Multiple Airlines Logo
7:12 pm - 8:42 pmBUF-ISP
25h 30m1 stop
$408Multiple Airlines
Find Deal
Fri, Nov 14 - Sat, Nov 15
JetBlue Logo
11:35 am - 9:51 pmISP-BUF
10h 16m1 stop
JetBlue Logo
8:00 am - 3:20 pmBUF-ISP
7h 20m1 stop
$453JetBlue
Find Deal
Wed, Oct 15 - Wed, Oct 22
JetBlue Logo
11:35 am - 9:46 pmISP-BUF
10h 11m1 stop
JetBlue Logo
8:00 am - 3:20 pmBUF-ISP
7h 20m1 stop
$745JetBlue
Find Deal
Sat, Oct 11 - Mon, Oct 13
Multiple Airlines Logo
7:30 am - 9:00 pmISP-BUF
13h 30m3 stops
Multiple Airlines Logo
5:40 pm - 7:45 pmBUF-ISP
26h 05m2 stops
$942Multiple Airlines
Find Deal
Wed, Nov 19 - Sat, Nov 22

Southwest flights from Islip to Buffalo

Our best Southwest deals on Islip to Buffalo flight tickets
Southwest
Nov 19
ISP5:40 amIslip Long Island
6h 25m
1 stop
BUF12:05 pmBuffalo
Nov 22
BUF3:45 pmBuffalo
7h 05m
1 stop
ISP10:50 pmIslip Long Island
$171
Find similar
Southwest
Nov 19
ISP6:15 amIslip Long Island
8h 05m
2 stops
BUF2:20 pmBuffalo
Nov 22
BUF3:45 pmBuffalo
7h 05m
1 stop
ISP10:50 pmIslip Long Island
$176
Find similar
Southwest
Oct 18
ISP11:55 amIslip Long Island
4h 25m
1 stop
BUF4:20 pmBuffalo
Oct 20
BUF5:45 amBuffalo
6h 05m
1 stop
ISP11:50 amIslip Long Island
$215
Find similar

Frontier flights from Islip to Buffalo

Our best Frontier deals on Islip to Buffalo flight tickets
Frontier
Sep 26
ISP5:05 pmIslip Long Island
25h 09m
1 stop
BUF6:14 pmBuffalo
Sep 29
BUF6:59 pmBuffalo
15h 41m
1 stop
ISP10:40 amIslip Long Island
$180
Find similar
Frontier
Oct 31
ISP9:54 amIslip Long Island
10h 59m
2 stops
BUF8:53 pmBuffalo
Nov 2
BUF9:04 pmBuffalo
12h 05m
1 stop
ISP9:09 amIslip Long Island
$200
Find similar
Frontier
Oct 31
ISP9:54 amIslip Long Island
10h 59m
2 stops
BUF8:53 pmBuffalo
Nov 2
BUF2:42 pmBuffalo
18h 27m
2 stops
ISP9:09 amIslip Long Island
$265
Find similar

momondo 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, momondo users made 832,500 searches. Data last updated September 17, 2025.
Use the filters below to find and compare flights from Islip to Buffalo that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

IslipBuffalo

ISP - BUF

ISPBUF

Islip Long Island

Wed 11/19

5:40 am-12:05 pm

1 stop6h 25m

Buffalo

Sat 11/22

3:45 pm-10:50 pm

1 stop7h 05m

$171

IslipBuffalo

ISP - BUF

ISPBUF

Islip Long Island

Wed 11/19

6:15 am-2:20 pm

2 stops8h 05m

Buffalo

Sat 11/22

3:45 pm-10:50 pm

1 stop7h 05m

$176

IslipBuffalo

ISP - BUF

ISPBUF

Islip Long Island

Fri 10/31

9:54 am-8:53 pm

2 stops10h 59m

Buffalo

Sun 11/2

9:04 pm-9:09 am

1 stop12h 05m

$200

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

$215

IslipBuffalo

ISP - BUF

ISPBUF

Islip Long Island

Mon 11/3

5:40 am-12:05 pm

1 stop6h 25m

Buffalo

Tue 11/4

12:40 pm-10:05 pm

1 stop9h 25m

$248

IslipBuffalo

ISP - BUF

ISPBUF

Islip Long Island

Fri 10/31

9:54 am-8:53 pm

2 stops10h 59m

Buffalo

Sun 11/2

2:42 pm-9:09 am

2 stops18h 27m

$265

IslipBuffalo

ISP - BUF

ISPBUF

Islip Long Island

Fri 11/14

2:25 pm-9:08 pm

1 stop6h 43m

Buffalo

Sat 11/15

7:12 pm-8:42 pm

1 stop25h 30m

$408

IslipBuffalo

ISP - BUF

ISPBUF

Islip Long Island

Wed 10/15

11:35 am-9:51 pm

1 stop10h 16m

Buffalo

Wed 10/22

8:00 am-3:20 pm

1 stop7h 20m

$453

IslipBuffalo

ISP - BUF

ISPBUF

Islip Long Island

Sat 10/11

11:35 am-9:46 pm

1 stop10h 11m

Buffalo

Mon 10/13

8:00 am-3:20 pm

1 stop7h 20m

$745

IslipBuffalo

ISP - BUF

ISPBUF

Islip Long Island

Wed 11/19

7:30 am-9:00 pm

3 stops13h 30m

Buffalo

Sat 11/22

5:40 pm-7:45 pm

2 stops26h 05m

$942

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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How to get the cheapest flight ticket from Islip to Buffalo

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 day to depart on your flight to Buffalo?

Our data shows that Tuesday is the least expensive day to fly to Buffalo. Tickets to fly out on this day can be as low as $192. Flights from Islip to Buffalo on a Sunday will generally be more expensive and average around $228. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

What is the cheapest time of day to depart on your flight to Buffalo?

In the morning is the cheapest time of day to fly from Islip to Buffalo when you can find flight prices for as low as $208. Flying to Buffalo in the morning is an ideal time because this is during off-peak travel hours. At noon is when there is more demand to fly to Buffalo, so prices are often more expensive at around $232 per ticket.

When to book flights from Islip to Buffalo

Are you open to changing your travel dates? Check out the ideal times to fly from Islip to Buffalo according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Islip to Buffalo (ISP to BUF) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Islip to Buffalo

Direct flights

None
There are no direct flights from Islip to Buffalo. There are no popular flight routes from Islip to Buffalo.
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  • How far is Islip Long Island to Buffalo by plane?

    Islip Long Island and Buffalo are 327.4 mi apart from one another. In terms of flight time, this usually takes a little over 3h 10m.

  • When did momondo last update prices for flights from Islip Long Island Airport to Buffalo Airport?

    Prices for flights from Islip Long Island Airport to Buffalo Airport are updated daily.

  • How many operators does momondo search for flights from Islip Long Island Airport to Buffalo Airport?

  • How old do you have to be to fly from Islip Long Island Airport to Buffalo Airport?

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Islip Long Island Airport to Buffalo Airport.

  • What documentation or ID do you need to fly to Buffalo Airport?

    The travel and health documents required for your trip to Buffalo Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Buffalo Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

  • What is the most popular airline from Islip to Buffalo?

Best airlines flying from Islip to Buffalo

Compare and see reviews for airlines that fly from Islip to Buffalo with momondo
Airline
Rating
Free Cancellation
Price
SouthwestPriceFrom $213Free CancellationRating
8.0
4,242 reviews
Search Southwest flights

Traveling to a place near Buffalo?

Book flights to Buffalo if you plan to visit one of these locations
Batavia
Cheektowaga
Tonawanda
Amherst
Williamsville
Grand Island
Orchard Park
Lockport
West Seneca
East Aurora
Bowmansville
Eden
Angola

Why use momondo?

Why should I use momondo to find a flight deal from Islip to Buffalo?

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Buffalo from Islip.

Can I find flights from Islip to Buffalo with flexible booking policies on momondo?

All flight searches from Islip to Buffalo on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from Islip to Buffalo?

momondo provides multiple filters to help you find the best flight to Buffalo from Islip. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

I’m not ready to book a flight from Islip to Buffalo right now. Can momondo alert me if prices change?

Yes momondo offers price alerts on flights to Buffalo from Islip. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

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