Cheap Flights from St. Louis (SUS) to Islip (ISP)

Popular airlines from St. Louis, MO (SUS-Spirit of St. Louis) to MacArthur Airport (ISP)

  • notification illustration

    Be in the know

    Get alerts if flight prices drop or rise*
  • deals illustration

    Book smarter

    Save up to 30% on select hotels after you book a flight*
  • trophy illustration

    Earn twice

    Earn your airline miles on top of our OneKeyCash
    Learn about One Key

Frequently asked questions

How much does a flight from Spirit of St. Louis Airport (SUS) to MacArthur Airport (ISP) cost?
Snag a cheap one-way flight or cheap return flight from Spirit of St. Louis Airport (SUS) to MacArthur Airport (ISP) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight deals on this route.
What is the cheapest month to fly from Spirit of St. Louis Airport (SUS) to MacArthur Airport (ISP)?
is the most affordable month to fly from SUS to ISP. Timing your trip outside of the busy season is often the key to finding better deals on flights.
What is the cheapest airline that flies from Spirit of St. Louis Airport (SUS) to MacArthur Airport (ISP)?
Use the filters on Expedia to compare different airlines and find the cheapest carrier that'll fly you from SUS to ISP. Then, sort your results by "Price (lowest to highest)" to pick up a good deal.
How many flights per day from Spirit of St. Louis Airport (SUS) to MacArthur Airport (ISP)?
There are no daily nonstop flights from Spirit of St. Louis Airport (SUS) to MacArthur Airport (ISP). But you can choose flights with layovers. Filter your search on Expedia to include one or more stops, and you'll be cruising above the clouds in no time at all.
What day of the week has the most flights from SUS to ISP?
Friday is typically the busiest day for flights, while Tuesday is often the quietest.* Just remember that flight schedules can change based on a number of factors, such as the season and airline.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Spirit of St. Louis Airport (SUS) to MacArthur Airport (ISP)?
Choose a flight from Spirit of St. Louis Airport (SUS) to MacArthur Airport (ISP) that leaves before 3 PM to reduce the risk of delays and cancellations. Later departures are on average 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 Spirit of St. Louis Airport (SUS) to MacArthur Airport (ISP) last-minute?
Last-minute bookings from SUS to ISP are generally more expensive. To secure the best rates, start looking for flights as soon as possible. That said, if you're flexible with your travel plans, you may find a cheap fare just before your departure.
Is it cheaper to book a SUS to ISP flight and hotel package?
Compared with arranging flights and hotels separately, booking a SUS to ISP flight and hotel package with Expedia could lead to significant savings. Better still, having it all in one place takes the hassle out of travel planning. Simply pick your flights and choose from our wide range of hotels, then personalize your trip with other add-ons like tours, car rentals and activities.
Can I cancel or change the date of my flight from Spirit of St. Louis Airport (SUS) to MacArthur Airport (ISP)?
Generally, it's possible to reschedule or cancel your SUS to ISP flight. However, for bookings 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 further details on our Customer Service portal.

Travel information

Origin airport
Spirit of St. Louis
Destination airport
MacArthur
Distance
942 mi

Book with confidence

St. Louis to Islip Flights

The cheapest times to fly from St. Louis 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 St. Louis to Islip are during the month of . You can find some of the cheapest flights from St. Louis to Islip with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from St. Louis to Islip

Sunday is one of the best days to book for cheap flights from St. Louis 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 St. Louis 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 St. Louis to Islip in 2026. You can also book with separate airlines for your outbound and return journeys, from 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 St. Louis 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 St. Louis 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.

 

St. Louis to Islip Flights

Explore a world of travel with Expedia

*Available to One Key members.