$397 Cheap Flights from St. Thomas (STT) to Idaho Falls (IDA)

View $397 flight on Thu, Jan 8, 2026Opens in a new window

Popular airlines from Cyril E. King Airport (STT) to Idaho Falls Regional Airport (IDA)

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Cheap Flights from St. Thomas to Idaho Falls (STT-IDA)

Prices were available within the past 7 days and start at $397 for one-way flights and for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Flights from St. Thomas (STT) to Idaho Falls (IDA)
Origin airport
Cyril E. King
Destination airport
Idaho Falls Regional
Distance
3229 mi

St. Thomas to Idaho Falls Flights

The cheapest times to fly from St. Thomas to Idaho Falls

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. Thomas to Idaho Falls are during the month of . You can find some of the cheapest flights from St. Thomas to Idaho Falls with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from St. Thomas to Idaho Falls

Sunday is one of the best days to book for cheap flights from St. Thomas to Idaho Falls: 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. Thomas to Idaho Falls

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. Thomas to Idaho Falls in 2025. You can also book with separate airlines for your outbound and return journeys, from $397 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. Thomas to Idaho Falls 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. Thomas to Idaho Falls 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 Cyril E. King Airport (STT) to Idaho Falls Regional Airport (IDA) cost?
Grab a cheap one-way flight from $397 or cheap return flight from Cyril E. King Airport (STT) to Idaho Falls Regional Airport (IDA) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight deals on this route.
What is the cheapest month to fly from Cyril E. King Airport (STT) to Idaho Falls Regional Airport (IDA)?
The cheapest month to fly from STT to IDA is , when demand is low. Off-peak season is typically when airlines offer lower prices between these airports.
What is the cheapest airline that flies from Cyril E. King Airport (STT) to Idaho Falls Regional Airport (IDA)?
Expedia's filter tool lets you easily compare different airlines, departure times and fares all in one place. Customize the search to your preferences, then sort by "Price (lowest to highest)" to see which carrier offers the cheapest STT to IDA flight.
How many flights per day from Cyril E. King Airport (STT) to Idaho Falls Regional Airport (IDA)?
Nonstop flights from Cyril E. King Airport (STT) to Idaho Falls Regional Airport (IDA) aren't available daily, so you'll have to take a flight with a layover. Explore your options with our filter tool. Enter your travel dates and pick either "1 Stop" or "2+ Stops."
What day of the week has the most flights from STT to IDA?
Usually you'll find the widest variety of flight choices on a Friday. Tuesdays are often the quietest.* However, this can vary depending on the season, airline 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 Cyril E. King Airport (STT) to Idaho Falls Regional Airport (IDA)?
Opt for a flight from Cyril E. King Airport (STT) to Idaho Falls Regional Airport (IDA) that takes off before 3 PM to reduce the risk of cancellations and delays. 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 Cyril E. King Airport (STT) to Idaho Falls Regional Airport (IDA) last-minute?
Last-minute bookings from STT to IDA are generally more expensive. To secure the best prices, start looking for flights as early as possible. That being said, if you're flexible with your travel plans, you may land a cheap fare right before your trip.
Is it cheaper to book a STT to IDA flight and hotel package?
Compared with arranging hotels and flights separately, booking a STT to IDA flight and hotel package with Expedia could lead to significant savings. What's more, having everything in one place will take the hassle out of planning your trip. Just pick your flights and choose from our wide range of stays, then tailor your trip with other add-ons like activities and car rentals.
Can I cancel or change the date of my flight from Cyril E. King Airport (STT) to Idaho Falls Regional Airport (IDA)?
In most instances, you can reschedule or cancel your STT to IDA flight. However, additional charges may apply, especially if you booked over 24 hours ago. Double-check your itinerary for the airline's fees and rules on flight changes, or if you'd like further information, head to our Customer Service portal.

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*Available to One Key members.