$354 Cheap Flights from Idaho Falls (IDA) to St. Thomas (STT)

View $354 flight on Sun, May 24, 2026Opens in a new window

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

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

Prices were available within the past 7 days and start at $354 for one-way flights and $713 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Wed, Jan 7 - Wed, Jan 21
IDA
Idaho Falls
STT
St. Thomas
$713 Roundtrip, found 2 days ago
$713
Roundtrip
found 2 days ago
Select United flight, departing Wed, Jan 7 from Idaho Falls to St. Thomas, returning Wed, Jan 21, priced at $713 found 2 days ago
United
Wed, Jan 7 - Fri, Jan 23
IDA
Idaho Falls
STT
St. Thomas
$713 Roundtrip, found 2 days ago
$713
Roundtrip
found 2 days ago
Select United flight, departing Wed, Jan 7 from Idaho Falls to St. Thomas, returning Fri, Jan 23, priced at $713 found 2 days ago
United
Sun, Jan 18 - Thu, Jan 29
IDA
Idaho Falls
STT
St. Thomas
$723 Roundtrip, found 2 days ago
$723
Roundtrip
found 2 days ago
Select United flight, departing Sun, Jan 18 from Idaho Falls to St. Thomas, returning Thu, Jan 29, priced at $723 found 2 days ago
United
Wed, Jan 7 - Thu, Jan 22
IDA
Idaho Falls
STT
St. Thomas
$724 Roundtrip, found 2 days ago
$724
Roundtrip
found 2 days ago
Select United flight, departing Wed, Jan 7 from Idaho Falls to St. Thomas, returning Thu, Jan 22, priced at $724 found 2 days ago
United
Mon, Jan 12 - Wed, Jan 21
IDA
Idaho Falls
STT
St. Thomas
$725 Roundtrip, found 6 days ago
$725
Roundtrip
found 6 days ago
Select United flight, departing Mon, Jan 12 from Idaho Falls to St. Thomas, returning Wed, Jan 21, priced at $725 found 6 days ago
United
Sat, Jan 10 - Wed, Jan 28
IDA
Idaho Falls
STT
St. Thomas
$726 Roundtrip, found 6 days ago
$726
Roundtrip
found 6 days ago
Select United flight, departing Sat, Jan 10 from Idaho Falls to St. Thomas, returning Wed, Jan 28, priced at $726 found 6 days ago
United
Sat, Jan 17 - Thu, Jan 29
IDA
Idaho Falls
STT
St. Thomas
$734 Roundtrip, found 2 days ago
$734
Roundtrip
found 2 days ago
Select United flight, departing Sat, Jan 17 from Idaho Falls to St. Thomas, returning Thu, Jan 29, priced at $734 found 2 days ago
United
Mon, Jan 12 - Thu, Jan 29
IDA
Idaho Falls
STT
St. Thomas
$736 Roundtrip, found 2 days ago
$736
Roundtrip
found 2 days ago
Select United flight, departing Mon, Jan 12 from Idaho Falls to St. Thomas, returning Thu, Jan 29, priced at $736 found 2 days ago
American Airlines
Sat, May 23 - Mon, Jun 1
IDA
Idaho Falls
STT
St. Thomas
$819 Roundtrip, found 2 days ago
$819
Roundtrip
found 2 days ago
Select American Airlines flight, departing Sat, May 23 from Idaho Falls to St. Thomas, returning Mon, Jun 1, priced at $819 found 2 days ago
Delta
Mon, Jan 12 - Fri, Jan 23
IDA
Idaho Falls
STT
St. Thomas
$1,327 Roundtrip, found 13 hours ago
$1,327
Roundtrip
found 13 hours ago
Select Delta flight, departing Mon, Jan 12 from Idaho Falls to St. Thomas, returning Fri, Jan 23, priced at $1,327 found 13 hours ago

Frequently asked questions

How much does a flight from Idaho Falls Regional Airport (IDA) to Cyril E. King Airport (STT) cost?
Grab a cheap one-way flight from $354 or cheap return flight from $713 from Idaho Falls Regional Airport (IDA) to Cyril E. King Airport (STT) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight offers on this route.
What is the cheapest month to fly from Idaho Falls Regional Airport (IDA) to Cyril E. King Airport (STT)?
The cheapest month to fly from IDA to STT is January, when demand is low. Off-peak months are generally when you'll find lower airfares between these airports.
What is the cheapest airline that flies from Idaho Falls Regional Airport (IDA) to Cyril E. King Airport (STT)?
Expedia's filter tool lets you easily compare different airlines, departure times and fares all in one place. Select your preferences, then sort by "Price (lowest to highest)" to find out which carrier offers the cheapest IDA to STT flight.
How many flights per day from Idaho Falls Regional Airport (IDA) to Cyril E. King Airport (STT)?
There are no daily nonstop flights from Idaho Falls Regional Airport (IDA) to Cyril E. King Airport (STT). But you can book flights with layovers. Filter your search results on Expedia to include one or two stops, and you'll be on your way in no time.
What day of the week has the most flights from IDA to STT?
Friday is generally the busiest day for flights, while Tuesday is often the quietest.* Just remember that flight schedules can change depending on various 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 Idaho Falls Regional Airport (IDA) to Cyril E. King Airport (STT)?
To touch down at Cyril E. King Airport (STT) on time, select a flight that takes off from Idaho Falls Regional Airport (IDA) before 3 PM. The likelihood of cancellations is 22% higher, on average, for departures after this hour.**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 Idaho Falls Regional Airport (IDA) to Cyril E. King Airport (STT) last-minute?
Booking your plane ticket from IDA to STT shortly before your getaway is typically more expensive. However, if you're flexible with your itinerary, you could snag a cheap last-minute fare.
Is it cheaper to book an IDA to STT flight and hotel package?
Opting for an IDA to STT flight and hotel package is typically cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your trip all in one place. Select from our wide range of accommodations and then add activities, flights and car rentals to your booking. Bundle it all together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Idaho Falls Regional Airport (IDA) to Cyril E. King Airport (STT)?
If you booked your IDA to STT flight in the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of fare you have, additional charges may apply for changes after that time. Airline policies and contact information can be found in your itinerary or confirmation email. Or, visit our Customer Service portal for further details.

Travel information

Origin airport
Idaho Falls Regional
Destination airport
Cyril E. King
Airlines serving
Delta, United
Roundtrip price
$712
Distance
3229 mi

Book with confidence

Idaho Falls to St. Thomas Flights

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

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

 

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

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

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 Idaho Falls to St. Thomas in 2026. You can also book with separate airlines for your outbound and return journeys, from $354 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 Idaho Falls to St. Thomas 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 Idaho Falls to St. Thomas 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.

 

Idaho Falls to St. Thomas Flights

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