In terms of precipitation, rainfall in Islip, New York ranges from 3.3 - 4.4 inches per month. March is typically the wettest month, when rainfall can reach 4.4 in. February is typically the driest time to visit Islip, New York when rainfall is around 3.3 in.

If weather is an important factor for your trip to Islip, New York, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 30.2 F).

How far in advance should I book a flight from Knoxville to Islip, New York?

Find a great deal and save up to 115% by booking at least 39 days prior to your desired departure date, rather than waiting until the week of travel. According to our data, there are a number of flights available from Knoxville to Islip, New York within the next two weeks, with the cheapest ticket starting at $188.

What is the cheapest month to fly from Knoxville to Islip, New York?

April can be a great time to fly to Islip, New York from Knoxville with a flight ticket averaging about $261. Cheapflights users have found deals in the month of April for as cheap as $54. The most expensive prices can be found in the month of March.

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

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Knoxville to Islip, New York as you normally would.

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

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

How can I find direct flights from Knoxville to Islip?

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

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

Yes. Cheapflights offers flight deals from Knoxville 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.

$314+ Flights from Knoxville to Islip, NY

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Cheap flight deals from Knoxville to Islip

Round-trip from	$544 (Mytrip)
One-way from	$314 (Mytrip)
Popular in	March
Cheapest in	April
Average price	$255

From Knoxville McGhee Tyson to Islip Long Island

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One-way flight from Knoxville McGhee Tyson to Islip Long Island

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High demand for flights, 2% potential price rise

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Cheapest flight prices on average. 0% potential price decrease ($3 potential savings vs. average RT price).

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Average for round-trip flights in July 2025

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Find flight deals from Knoxville to Islip

Cheapest flights from Knoxville to Islip
Explore the most affordable flight options available from Knoxville to Islip. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 8, 2025.

Sat 7/266:08 pmTYS - ISP

2 stops24h 51mMultiple Airlines

Thu 7/317:30 amISP - TYS

1 stop7h 39mMultiple Airlines

Deal found 7/8

$544

Thu 7/105:25 pmTYS - ISP

2 stops19h 39mFrontier

Fri 7/118:37 pmISP - TYS

2 stops43h 52mFrontier

Deal found 7/5

$769

Best flights from Knoxville to Islip
Discover carefully curated flight deals from Knoxville to Islip that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated July 8, 2025.

Sat 7/266:08 pmTYS - ISP

2 stops24h 51mMultiple Airlines

Thu 7/317:30 amISP - TYS

1 stop7h 39mMultiple Airlines

Deal found 7/8

$544

Thu 7/245:25 pmTYS - ISP

2 stops19h 39mFrontier

Sat 7/268:37 pmISP - TYS

2 stops19h 52mFrontier

Deal found 7/6

$869

Last-minute flights from Knoxville to Islip
Discover last-minute flight deals from Knoxville to Islip. Data last updated July 8, 2025 and is based on user searches.

Thu 7/105:25 pmTYS - ISP

2 stops19h 39mFrontier

Fri 7/118:37 pmISP - TYS

2 stops43h 52mFrontier

Deal found 7/5

$769

Sat 7/266:08 pmTYS - ISP

2 stops24h 51mMultiple Airlines

Thu 7/317:30 amISP - TYS

1 stop7h 39mMultiple Airlines

Deal found 7/8

$544

One-way flights from Knoxville to Islip
Search for one-way flight options from Knoxville to Islip. Find affordable one-way fares based on user searches. Data last updated July 8, 2025.

Tue 7/227:00 amTYS - ISP

1 stop6h 24mMultiple Airlines

Deal found 7/6

$314

Thu 7/245:25 pmTYS - ISP

2 stops19h 39mFrontier

Deal found 7/8

$498

Cheapflights Fare Finder

Use the filters below to find and compare flights from Knoxville to Islip that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

KnoxvilleIslip

TYS - ISP

TYSISP

Knoxville McGhee Tyson

Sat 7/26

6:08 pm-6:59 pm

2 stops24h 51m

Islip Long Island

Thu 7/31

7:30 am-3:09 pm

1 stop7h 39m

$544

KnoxvilleIslip

TYS - ISP

TYSISP

Knoxville McGhee Tyson

Thu 7/24

5:25 pm-1:04 pm

2 stops19h 39m

Islip Long Island

Sat 7/26

8:37 pm-4:29 pm

2 stops19h 52m

$869

KnoxvilleIslip

TYS - ISP

TYSISP

Knoxville McGhee Tyson

Tue 7/22

7:00 am-1:24 pm

1 stop6h 24m

$314

KnoxvilleIslip

TYS - ISP

TYSISP

Knoxville McGhee Tyson

Thu 7/24

5:25 pm-1:04 pm

2 stops19h 39m

$498

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/6

Best time to book a flight from Knoxville to Islip

Have a flexible travel schedule? Discover the best time to fly to Islip from Knoxville 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 Knoxville to Islip

What is the cheapest month to book a flight from Knoxville to Islip, New York?

Currently, January is the cheapest month in which you can book a flight from Knoxville to Islip, New York (average of $108). Flying from Knoxville to Islip, New York in November is currently the most expensive (average of $213). 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.

Reviews of airlines servicing Islip

Get a feel of what it's like to fly with Frontier from Knoxville to Islip by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Frontier

5.9

Fair

3,273 reviews

Reviews

1 / 20

8.0

Excellent

Anonymous,Jun 2025

TTN - TPA

TTN is a small airport for Frontier. Drop off is easy as is parking. The location is remote so there is zero traffic. The place could use a renovation but for the price you pay it is not necessary. Good-Staff is very friendly. Flight left on time. Bad- run down, deplaning/boarding on the tarmac. I got wet on the stairs outside of the plane while waiting to board.

Frontier

5.9

Fair

3,273 reviews

Frontier

5.9

Fair

3,273 reviews

Reviews

1 / 20

8.0

Excellent

Anonymous,Jun 2025

TTN - TPA

Related info for your journey

Can I find deals for flights from Knoxville to Islip that include hotel bookings?
Yes. In addition to deals on Knoxville to Islip flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Knoxville to Islip?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Knoxville to Islip.
Can I find deals for business class flights from Knoxville to Islip?
Yes. Cheapflights offers flight deals from Knoxville 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.
What is the cheapest month to book a flight from Knoxville to Islip, New York?
Currently, January is the cheapest month in which you can book a flight from Knoxville to Islip, New York (average of $108). Flying from Knoxville to Islip, New York in November is currently the most expensive (average of $213). 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.

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Complete your trip

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$314+ Cheap flights from Knoxville to Islip, NY (TYS - ISP)

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 7/22. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Knoxville to Islip with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheap flight deals from Knoxville to Islip

Round-trip from

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Find flight deals from Knoxville to Islip

Cheapest flights from Knoxville to IslipExplore the most affordable flight options available from Knoxville to Islip. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 8, 2025.

Explore the most affordable flight options available from Knoxville to Islip. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 8, 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from Knoxville to Islip that are best for you.

Best time to book a flight from Knoxville to Islip

Have a flexible travel schedule? Discover the best time to fly to Islip from Knoxville with our price prediction graph.

Cheapflights Insights

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

What is the cheapest month to book a flight from Knoxville to Islip, New York?

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 July 8, 2025.

Get a feel of what it's like to fly with Frontier from Knoxville to Islip by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

Find useful and relevant information for your journey from Knoxville 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 deals for flights from Knoxville to Islip that include hotel bookings?

How can I find direct flights from Knoxville to Islip?

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

What is the cheapest month to book a flight from Knoxville to Islip, New York?

Traveling to a place near Knoxville?

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Alternative routes for Knoxville to Islip

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Travel Smart

Cheapest flights from Knoxville to Islip
Explore the most affordable flight options available from Knoxville to Islip. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 8, 2025.