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$82+ Cheap flights from Detroit to Islip (DTT - 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 10/16. Fares are subject to change and may not be available on all flights or dates of travel.
DTT — ISP
Oct 15 — Oct 221
Wed 10/15
Wed 10/22
1 adult, Economy
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Cheap flight deals from Detroit to Islip

Discover tips and strategies to find the most affordable flight options for your journey from Detroit (DTT) to Islip (ISP). 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 15, 2025.

Round-trip from

$224
(Frontier)

One-way from

$82
(Cheapflightsfares)

Popular in

November

Cheapest in

February

Average price

$166
From Detroit (DTT) to Islip Long Island
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One-way flight from Detroit (DTT) to Islip Long Island
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Highest demand for flights based on searches. 11% potential increase in price ($22 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($4 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 Detroit to Islip

Cheapest flights from Detroit to Islip
Explore the most affordable flight options available from Detroit to Islip. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 15, 2025.

This Frontier deal was found by Cheapflights users on 9/12. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/246:12 pmDTW - ISP
2 stops16h 25mFrontier
Sun 10/269:47 pmISP - DTW
2 stops18h 16mFrontier
Deal found 9/12$224
This Kiwi.com deal was found by Cheapflights users on 9/12. 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.
Fri 10/104:50 pmDTW - ISP
1 stop17h 47mMultiple Airlines
Tue 10/149:37 pmISP - DTW
2 stops27h 08mMultiple Airlines
Deal found 9/12$245
This Trip.com deal was found by Cheapflights users on 9/13. 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.
Sun 9/281:36 pmDTW - ISP
1 stop21h 04mFrontier
Thu 10/211:40 amISP - DTW
1 stop21h 04mFrontier
Deal found 9/13$252
This Frontier deal was found by Cheapflights users on 9/12. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/1111:43 amDTW - ISP
1 stop7h 23mFrontier
Sun 12/149:09 pmISP - DTW
1 stop11h 26mFrontier
Deal found 9/12$274
This Frontier deal was found by Cheapflights users on 9/12. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/104:58 pmDTW - ISP
2 stops17h 39mFrontier
Sun 10/129:47 pmISP - DTW
2 stops18h 16mFrontier
Deal found 9/12$292
This Kiwi.com deal was found by Cheapflights users on 9/13. 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.
Mon 10/132:53 pmDTW - ISP
1 stop29h 49mMultiple Airlines
Mon 10/204:58 pmISP - DTW
1 stop18h 50mMultiple Airlines
Deal found 9/13$306
This Southwest deal was found by Cheapflights users on 9/12. 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 10/101:15 pmDTW - ISP
2 stops10h 30mSouthwest
Tue 10/141:10 pmISP - DTW
2 stops9h 35mSouthwest
Deal found 9/12$428
This Trip.com deal was found by Cheapflights users on 9/13. 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.
Sun 9/286:41 amDTW - ISP
3 stops27h 59mMultiple Airlines
Thu 10/211:40 amISP - DTW
1 stop21h 04mMultiple Airlines
Deal found 9/13$444
This Kiwi.com deal was found by Cheapflights users on 9/13. 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.
Fri 9/269:00 amDTW - ISP
1 stop9h 28mMultiple Airlines
Fri 9/268:47 pmISP - DTW
2 stops35h 28mMultiple Airlines
Deal found 9/13$457

Cheapflights Fare Finder

 
Customize your flight search to find flights from Detroit 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 2,558,603 searches. Data last updated September 15, 2025.
Use the filters below to find and compare flights from Detroit to Islip that are best for you.

Fly from

Detroit

Fly to

Islip

Route

Depart

Return

Price

DetroitIslip

DTW - ISP

DTWISP

Detroit Metropolitan Wayne County

Fri 10/24

6:12 pm-10:37 am

2 stops16h 25m

Islip Long Island

Sun 10/26

9:47 pm-4:03 pm

2 stops18h 16m

$224

DetroitIslip

DTW - ISP

DTWISP

Detroit Metropolitan Wayne County

Fri 10/10

4:50 pm-10:37 am

1 stop17h 47m

Islip Long Island

Tue 10/14

9:37 pm-12:45 am

2 stops27h 08m

$245

DetroitIslip

DTW - ISP

DTWISP

Detroit Metropolitan Wayne County

Sun 9/28

1:36 pm-10:40 am

1 stop21h 04m

Islip Long Island

Thu 10/2

11:40 am-8:44 am

1 stop21h 04m

$252

DetroitIslip

DTW - ISP

DTWISP

Detroit Metropolitan Wayne County

Thu 12/11

11:43 am-7:06 pm

1 stop7h 23m

Islip Long Island

Sun 12/14

9:09 pm-8:35 am

1 stop11h 26m

$274

DetroitIslip

DTW - ISP

DTWISP

Detroit Metropolitan Wayne County

Fri 10/10

4:58 pm-10:37 am

2 stops17h 39m

Islip Long Island

Sun 10/12

9:47 pm-4:03 pm

2 stops18h 16m

$292

DetroitIslip

DTW - ISP

DTWISP

Detroit Metropolitan Wayne County

Fri 12/12

9:30 am-8:14 pm

1 stop10h 44m

Islip Long Island

Sun 12/14

9:09 pm-8:35 am

1 stop11h 26m

$306

DetroitIslip

DTW - ISP

DTWISP

Detroit Metropolitan Wayne County

Mon 10/13

4:58 pm-8:42 pm

2 stops27h 44m

Islip Long Island

Mon 10/20

4:58 pm-11:48 am

1 stop18h 50m

$308

DetroitIslip

DTW - ISP

DTWISP

Detroit Metropolitan Wayne County

Fri 10/10

1:15 pm-11:45 pm

2 stops10h 30m

Islip Long Island

Tue 10/14

1:10 pm-10:45 pm

2 stops9h 35m

$428

DetroitIslip

DTW - ISP

DTWISP

Detroit Metropolitan Wayne County

Sun 9/28

6:41 am-10:40 am

3 stops27h 59m

Islip Long Island

Thu 10/2

11:40 am-8:44 am

1 stop21h 04m

$444

DetroitIslip

DTW - ISP

DTWISP

Detroit Metropolitan Wayne County

Thu 10/16

1:24 pm-8:42 pm

1 stop7h 18m

$82

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/13

Showing 1-10 of 15 results
1
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Best time to book a flight from Detroit to Islip

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

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

Currently, January is the cheapest month in which you can book a flight from Detroit to Islip (average of $108). Flying from Detroit to Islip 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.

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

Find hourly flight availability from Detroit to Islip. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 15, 2025.

It’s typically best to fly out from Detroit to Islip in the morning. Doing so could potentially save you 2% on the flight price compared to flying at noon, which is usually more expensive.

Related info for your journey

Find useful and relevant information for your journey from Detroit to Islip. 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 Detroit to Islip?

    Airlines like Frontier fly from Detroit to Islip in about 16h 25m. The time it takes to get you to your destination can typically vary by up to . Airlines will cover a distance of 539 mi.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Detroit 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 Detroit to Islip?

    Currently, January is the cheapest month in which you can book a flight from Detroit to Islip (average of $108). Flying from Detroit to Islip 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.

See more FAQs

Traveling to a place near Islip?

Book flights to Islip if you plan to visit one of these locations
Riverhead
Southampton

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Alternative routes for Detroit to Islip

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

Discover the top airline that operate flights from Detroit to Islip. 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 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
SouthwestCheapest$286Average$376FlexibilityNo cancel feeOn-time63%

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