$226+ Cheap flights from Islip, NY to Milwaukee (ISP - MKE)
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/23. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — MKE
Oct 18 — Oct 251
Round-trip
1 adult, Economy
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Find cheap flights from Islip to Milwaukee with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from Islip to Milwaukee
Cheapest
Best
Last-minute
One-way
Cheapest flights from Islip to MilwaukeeExplore the most affordable flight options available from Islip to Milwaukee. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 18, 2026.
Explore the most affordable flight options available from Islip to Milwaukee. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 18, 2026.
This Southwest deal was found by Cheapflights users on 9/17. 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 10/176:15 am -
1 stop7h 05m
Sat 10/245:50 am -
1 stop5h 05m
Deal found 9/17![Southwest logo]()
$299
This Southwest deal was found by Cheapflights users on 9/18. 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 11/612:25 pm -
1 stop5h 50m
Sun 11/86:55 am -
1 stop3h 50m
Deal found 9/18![Southwest logo]()
$353
This Southwest deal was found by Cheapflights users on 9/14. 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.
Tue 9/296:05 am -
1 stop6h 55m
Sat 10/35:50 am -
1 stop5h 05m
Deal found 9/14![Southwest logo]()
$441
Best flights from Islip to MilwaukeeDiscover carefully curated flight deals from Islip to Milwaukee that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 18, 2026.
Discover carefully curated flight deals from Islip to Milwaukee that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 18, 2026.
This Southwest deal was found by Cheapflights users on 9/17. 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 10/176:15 am -
1 stop7h 05m
Sat 10/245:50 am -
1 stop5h 05m
Deal found 9/17![Southwest logo]()
$299
This Southwest deal was found by Cheapflights users on 9/18. 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 11/612:25 pm -
1 stop5h 50m
Sun 11/85:10 am -
2 stops9h 25m
Deal found 9/18![Southwest logo]()
$370
This Southwest deal was found by Cheapflights users on 9/14. 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.
Tue 9/296:05 am -
1 stop6h 55m
Sat 10/35:50 am -
1 stop5h 05m
Deal found 9/14![Southwest logo]()
$441
Last-minute flights from Islip to MilwaukeeDiscover last-minute flight deals from Islip to Milwaukee. Data last updated September 18, 2026 and is based on user searches.
Discover last-minute flight deals from Islip to Milwaukee. Data last updated September 18, 2026 and is based on user searches.
This Southwest deal was found by Cheapflights users on 9/14. 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.
Tue 9/296:05 am -
1 stop6h 55m
Sat 10/35:50 am -
1 stop5h 05m
Deal found 9/14![Southwest logo]()
$441
This Southwest deal was found by Cheapflights users on 9/17. 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 10/176:15 am -
1 stop7h 05m
Sat 10/245:50 am -
1 stop5h 05m
Deal found 9/17![Southwest logo]()
$299
One-way flights from Islip to MilwaukeeSearch for one-way flight options from Islip to Milwaukee. Find affordable one-way fares based on user searches. Data last updated September 18, 2026.
Search for one-way flight options from Islip to Milwaukee. Find affordable one-way fares based on user searches. Data last updated September 18, 2026.
This CheapOair deal was found by Cheapflights users on 9/15. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/235:43 pm -
1 stop16h 25m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/15![Frontier logo]()
$226
This Southwest deal was found by Cheapflights users on 9/15. 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.
Wed 9/233:20 pm -
2 stops7h 00m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/15![Southwest logo]()
$360
Find flight deals from Islip to Milwaukee
Discover tips and strategies to find the most affordable flight options for your journey from Islip (ISP) to Milwaukee (MKE). 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 18, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $299 (Southwest) |
One-way from | $226 (CheapOair) |
Popular in | December |
Cheapest in | January |
Average price | $470 |
Cheapflights Fare Finder
Customize your flight search to find flights from Islip to Milwaukee 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 7,457,451 searches. Data last updated September 18, 2026.
Use the filters below to find and compare flights from Islip to Milwaukee that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
IslipMilwaukee
ISP Islip Long Island - MKE Milwaukee-Mitchell
ISPMKE
Islip Long Island
Sat 10/17
6:15 am-12:20 pm
1 stop7h 05m
Milwaukee-Mitchell
Sat 10/24
5:50 am-11:55 am
1 stop5h 05m
$299
Quickest round-trip
IslipMilwaukee
ISP Islip Long Island - MKE Milwaukee-Mitchell
ISPMKE
Islip Long Island
Wed 9/23
3:20 pm-9:20 pm
2 stops7h 00m
Milwaukee-Mitchell
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$360
IslipMilwaukee
ISP Islip Long Island - MKE Milwaukee-Mitchell
ISPMKE
Islip Long Island
Fri 11/6
12:25 pm-5:15 pm
1 stop5h 50m
Milwaukee-Mitchell
Sun 11/8
5:10 am-3:35 pm
2 stops9h 25m
$370
IslipMilwaukee
ISP Islip Long Island - MKE Milwaukee-Mitchell
ISPMKE
Islip Long Island
Tue 9/29
6:05 am-12:00 pm
1 stop6h 55m
Milwaukee-Mitchell
Sat 10/3
5:50 am-11:55 am
1 stop5h 05m
$441
Sorted by cheapest first
Compare providers for flights from Islip to Milwaukee
Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Islip to Milwaukee in September.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on Islip, New York-Milwaukee flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Islip, New York-Milwaukee flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Islip, New York-Milwaukee flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Islip, New York-Milwaukee flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Islip, New York-Milwaukee flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.
Best time to book a flight from Islip to Milwaukee
Have a flexible travel schedule? Discover the best time to fly to Milwaukee from Islip with our price prediction graph.
ISP-MKE
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.
Related info for your journey
Find useful and relevant information for your journey from Islip to Milwaukee. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Traveling to a place near Milwaukee?
Book flights to Milwaukee if you plan to visit one of these locationsPort Washington
Sheboygan
New Berlin
Oak Creek
Wauwatosa
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