TYS - ISP

$136 Find Cheap Flights from Knoxville to Islip

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Knoxville to Islip departing on 7/24. 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.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Islip

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Knoxville to Islip, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Knoxville to Islip, as well as popular online travel agencies
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Everything you should know

Cheapest round-trip
$294
Southwest
Wed 7/15Sat 8/29
TYS - ISP • 1 stop
Cheapest one-way
$136
Multiple Airlines
Fri 7/24
TYS - ISP • 1 stop
Nonstop flights
Not available
There are currently no direct flights between Knoxville and Islip. You'll need at least 1 connection.
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Booking Insights
Flight Deals

Cheap Flights from Knoxville to Islip (TYS-ISP)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Knoxville to Islip that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Knoxville to Islip

Wed, Jul 15 - Sat, Aug 29
Southwest Logo
8:10 am - 1:45 pm
TYS
-
ISP
5h 35m
1 stop
Southwest Logo
3:15 pm - 7:20 pm
ISP
-
TYS
4h 05m
1 stop
$294Southwest
Wed, Jul 15 - Sat, Aug 29
Southwest Logo
8:10 am - 1:45 pm
TYS
-
ISP
5h 35m
1 stop
Southwest Logo
5:30 am - 2:40 pm
ISP
-
TYS
9h 10m
2 stops
$299Southwest
Wed, Jul 15 - Sat, Aug 29
Southwest Logo
12:45 pm - 10:40 pm
TYS
-
ISP
9h 55m
2 stops
Southwest Logo
5:30 am - 2:40 pm
ISP
-
TYS
9h 10m
2 stops
$304Southwest
Wed, Jul 8 - Tue, Jul 14
Southwest Logo
8:10 am - 1:45 pm
TYS
-
ISP
5h 35m
1 stop
Southwest Logo
4:40 pm - 9:20 pm
ISP
-
TYS
4h 40m
1 stop
$307Southwest
Wed, Jul 8 - Tue, Jul 14
Southwest Logo
8:10 am - 10:40 pm
TYS
-
ISP
14h 30m
2 stops
Southwest Logo
2:55 pm - 9:20 pm
ISP
-
TYS
6h 25m
1 stop
$312Southwest
Wed, Jul 8 - Tue, Jul 14
Southwest Logo
12:45 pm - 10:40 pm
TYS
-
ISP
9h 55m
2 stops
Southwest Logo
12:25 pm - 8:25 pm
ISP
-
TYS
8h 00m
2 stops
$317Southwest
Mon, Aug 3 - Mon, Aug 10
Southwest Logo
7:30 am - 11:50 am
TYS
-
ISP
4h 20m
1 stop
Southwest Logo
6:45 am - 5:10 pm
ISP
-
TYS
10h 25m
1 stop
$341Southwest
Mon, Aug 3 - Mon, Aug 10
Southwest Logo
12:35 pm - 11:40 pm
TYS
-
ISP
11h 05m
2 stops
Southwest Logo
6:45 am - 5:10 pm
ISP
-
TYS
10h 25m
1 stop
$352Southwest
Fri, Aug 14 - Fri, Aug 14
Southwest Logo
8:25 am - 12:35 pm
TYS
-
ISP
4h 10m
1 stop
Southwest Logo
4:05 pm - 7:55 pm
ISP
-
TYS
3h 50m
1 stop
$357Southwest
Thu, Jul 16 - Mon, Jul 20
Southwest Logo
12:35 pm - 11:45 pm
TYS
-
ISP
11h 10m
1 stop
Southwest Logo
5:50 pm - 10:35 pm
ISP
-
TYS
4h 45m
1 stop
$362Southwest
Booking Insights

KAYAK's insights & trends for Knoxville to Islip flights

Get data-powered insights and trends into flights from Knoxville to Islip to help you find the cheapest flights, the best time to fly and much more.

How long does a flight from Knoxville to Islip take?

Flying between Islip and Knoxville will take minimum 2h 55m and will require at least one stop.

Find deals

Good to know

Cheapest flight$136
Flight from Knoxville to Islip

When to book flights from Knoxville to Islip

Are your dates flexible? Find out the best times to travel from Knoxville to Islip based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Knoxville to Islip

  • What is the cheapest flight from Knoxville to Islip?

    In the last 5 days, the lowest price for a flight from Knoxville to Islip was $136 for a one-way ticket and $341 for a round-trip.

  • Do I need a passport to fly between Knoxville and Islip?

    No

  • Which aircraft models fly most regularly from Knoxville to Islip?

    We unfortunately don’t have that data for this specific route.

  • How does KAYAK find such low prices on flights from Knoxville to Islip?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Knoxville to Islip.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Knoxville to Islip?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Islip from Knoxville is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Knoxville to Islip?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Islip with an airline and back to Knoxville with another airline. Booking your flights between Knoxville and ISP can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Knoxville to Islip?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Islip from Knoxville up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top airline flying from Knoxville to Islip

 
See real verified KAYAK customer reviews for airlines flying from Knoxville to Islip. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Knoxville to Islip? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.9
SouthwestOverall score based on 4235 reviews
8.1Boarding
8.0Comfort
8.6Crew
7.0Food
7.5Entertainment
Airline reviews

Flight was delayed over 3 hours. Planes were dirty. Staff indifferent. And they serve vegan pretzels as snacks.

2.0 MediocreMatthew, Jun 2026
CVG - MDW
Read more Southwest reviews

Flight was delayed over 3 hours. Planes were dirty. Staff indifferent. And they serve vegan pretzels as snacks.

It was great. The gate staff were very helpful in Portland when my son forgot his rolling bag and had to go back to get it just in time to make it on the plane. We really appreciate that. Great job!

Airline is not very senior friendly. Flights are late, forcing us to run to the connecting flight. Food is awful. Wish they would go back to pretzels and peanuts. During flight, pressurization isn’t quite right and all of our ears get plugged. Everything is nickel and dime, charging for boarding, seat selection and legroom. While a screen at the desk in the gate area says check your roll on bag now for free due to space limitation, the employee at the desk will not check the bag without a $100 fee. Insane.

Kayak could’ve posted the correct gate number. Almost missed my flight.

Slow boarding, limited food and drink portions. Bad delays and turbulence

there were two flight attendants that were up front...that were the best! They get KUDOs for making my trip only fantastic. Tell them Jeff said that!

OKay. I sat in the back of the plane and it was really loud between babies and little kids, and adults who.like to talk a lot and loudly most of the flight.

Flight coming out of Buffalo was delayed, so we had to be rescheduled on another flight from Baltimore to Phoenix which means we had a long layover and got home 3.5 hours late. Shuttle to parking stopped at 10pm, so we had to pay for an Uber to the parking lot and got charged an extra day of parking since it was after midnight. Not the best experience. Long day!

Was fine, delayed and feels like southwest is always late

I don't know why flying out of Sarasota requires two plane changes.

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

Information on your arrival and departure airports

Knoxville (TYS)
Islip (ISP)