$667 Cheap Flights from Champaign (CMI) to Islip (ISP)

View $667 flight on Sun, Aug 17, 2025Opens in a new window

Popular airlines from Champaign, IL (CMI-University Of Illinois Urbana-Champaign Williard) to MacArthur Airport (ISP)

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Cheap Flights from Champaign to Islip (CMI-ISP)

Prices were available within the past 7 days and start at $667 for one-way flights and $1,100 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

American Airlines
Sun, Aug 24 - Sun, Aug 31
CMI
Champaign
ISP
Islip
$1,100 Roundtrip, found 2 days ago
$1,100
Roundtrip
found 2 days ago
Select American Airlines flight, departing Sun, Aug 24 from Champaign to Islip, returning Sun, Aug 31, priced at $1,100 found 2 days ago
American Airlines
Sun, Aug 24 - Sun, Aug 31
CMI
Champaign
ISP
Islip
$1,143 Roundtrip, found 2 days ago
$1,143
Roundtrip
found 2 days ago
Select American Airlines flight, departing Sun, Aug 24 from Champaign to Islip, returning Sun, Aug 31, priced at $1,143 found 2 days ago
American Airlines
Sun, Aug 24 - Sun, Aug 31
CMI
Champaign
ISP
Islip
$1,160 Roundtrip, found 2 days ago
$1,160
Roundtrip
found 2 days ago
Select American Airlines flight, departing Sun, Aug 24 from Champaign to Islip, returning Sun, Aug 31, priced at $1,160 found 2 days ago
American Airlines
Sun, Aug 24 - Sun, Aug 31
CMI
Champaign
ISP
Islip
$1,203 Roundtrip, found 2 days ago
$1,203
Roundtrip
found 2 days ago
Select American Airlines flight, departing Sun, Aug 24 from Champaign to Islip, returning Sun, Aug 31, priced at $1,203 found 2 days ago
American Airlines
Mon, Aug 25 - Mon, Sep 1
CMI
Champaign
ISP
Islip
$1,295 Roundtrip, found 2 days ago
$1,295
Roundtrip
found 2 days ago
Select American Airlines flight, departing Mon, Aug 25 from Champaign to Islip, returning Mon, Sep 1, priced at $1,295 found 2 days ago
American Airlines
Mon, Aug 25 - Mon, Sep 1
CMI
Champaign
ISP
Islip
$1,355 Roundtrip, found 2 days ago
$1,355
Roundtrip
found 2 days ago
Select American Airlines flight, departing Mon, Aug 25 from Champaign to Islip, returning Mon, Sep 1, priced at $1,355 found 2 days ago
American Airlines
Mon, Aug 25 - Mon, Sep 1
CMI
Champaign
ISP
Islip
$1,369 Roundtrip, found 2 days ago
$1,369
Roundtrip
found 2 days ago
Select American Airlines flight, departing Mon, Aug 25 from Champaign to Islip, returning Mon, Sep 1, priced at $1,369 found 2 days ago
American Airlines
Mon, Aug 25 - Mon, Sep 1
CMI
Champaign
ISP
Islip
$1,391 Roundtrip, found 2 days ago
$1,391
Roundtrip
found 2 days ago
Select American Airlines flight, departing Mon, Aug 25 from Champaign to Islip, returning Mon, Sep 1, priced at $1,391 found 2 days ago
American Airlines
Mon, Aug 25 - Mon, Sep 1
CMI
Champaign
ISP
Islip
$1,429 Roundtrip, found 2 days ago
$1,429
Roundtrip
found 2 days ago
Select American Airlines flight, departing Mon, Aug 25 from Champaign to Islip, returning Mon, Sep 1, priced at $1,429 found 2 days ago
American Airlines
Mon, Aug 25 - Mon, Sep 1
CMI
Champaign
ISP
Islip
$1,451 Roundtrip, found 2 days ago
$1,451
Roundtrip
found 2 days ago
Select American Airlines flight, departing Mon, Aug 25 from Champaign to Islip, returning Mon, Sep 1, priced at $1,451 found 2 days ago
Flights from Champaign (CMI) to Islip (ISP)
Origin airport
University Of Illinois Urbana-Champaign Williard
Destination airport
MacArthur
Roundtrip price
$1,100
Distance
798 mi

Champaign to Islip Flights

The cheapest times to fly from Champaign to Islip

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Champaign to Islip are during the month of August. You can find some of the cheapest flights from Champaign to Islip with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Champaign to Islip

Sunday is one of the best days to book for cheap flights from Champaign to Islip: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Champaign to Islip

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Champaign to Islip in 2025. You can also book with separate airlines for your outbound and return journeys, from $667 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Champaign to Islip flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Champaign to Islip airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from University Of Illinois Urbana-Champaign Williard Airport (CMI) to MacArthur Airport (ISP) cost?
Secure a cheap one-way flight from $667 or cheap return flight from $1,100 from University Of Illinois Urbana-Champaign Williard Airport (CMI) to MacArthur Airport (ISP) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight offers on this route.
What is the cheapest month to fly from University Of Illinois Urbana-Champaign Williard Airport (CMI) to MacArthur Airport (ISP)?
August is the least expensive month to fly from CMI to ISP. Planning your trip for the off-season is often the key to finding better deals on flights.
What is the cheapest airline that flies from University Of Illinois Urbana-Champaign Williard Airport (CMI) to MacArthur Airport (ISP)?
Expedia's filter tool lets you easily compare airlines, flight times and baggage options all in one place. Select your preferences, then sort by "Price (lowest to highest)" to find out which carrier offers the cheapest CMI to ISP flight.
How many flights per day from University Of Illinois Urbana-Champaign Williard Airport (CMI) to MacArthur Airport (ISP)?
Direct flights from University Of Illinois Urbana-Champaign Williard Airport (CMI) to MacArthur Airport (ISP) aren't available daily, so you'll have to take a flight with a layover. Explore your options with Expedia's filter tool. Enter your dates and pick either "1 Stop" or "2+ Stops."
What day of the week has the most flights from CMI to ISP?
Generally you'll find the greatest selection of flight options on a Friday. Tuesdays tend to be the quietest.* But this can vary depending on the time of year, carrier and other factors.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from University Of Illinois Urbana-Champaign Williard Airport (CMI) to MacArthur Airport (ISP)?
To avoid possible delays on the University Of Illinois Urbana-Champaign Williard Airport (CMI) to MacArthur Airport (ISP) route, aim to fly before 3 PM. Flights after this time are 22% more likely to be canceled.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from University Of Illinois Urbana-Champaign Williard Airport (CMI) to MacArthur Airport (ISP) last-minute?
Holding off until just before your departure to book a flight from CMI to ISP often results in higher prices. While you may come across some last-minute offers, there's no guarantee. Be flexible with your travel plans to boost your chances of snagging a bargain.
Is it cheaper to book a CMI to ISP flight and hotel package?
Compared with arranging hotels and flights separately, booking a CMI to ISP flight and hotel package with Expedia could lead to significant savings. Better still, having everything in one easy place takes the hassle out of planning your trip. Just secure your flights and select from our extensive range of stays, then personalize your trip with other add-ons like tours and car rentals.
Can I cancel or change the date of my flight from University Of Illinois Urbana-Champaign Williard Airport (CMI) to MacArthur Airport (ISP)?
Typically, it's possible to reschedule or cancel your CMI to ISP flight. However, if the booking was made more than 24 hours ago, additional fees may apply. Refer to your airline's policies in your itinerary to see what changes are possible and if any costs are involved. You'll also find more information on our Customer Service portal.

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*Available to One Key members.