$388 Cheap Flights from Idaho Falls (IDA) to Watertown (ATY)

View $388 flight on Mon, Nov 24, 2025Opens in a new window

Popular airlines from Idaho Falls Regional Airport (IDA) to Watertown, SD (ATY-Watertown Regional)

Cheap Flights from Idaho Falls to Watertown (IDA-ATY)

Prices were available within the past 7 days and start at $388 for one-way flights and $551 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Fri, Oct 3 - Mon, Oct 6
IDA
Idaho Falls
ATY
Watertown
$551 Roundtrip, found 6 days ago
$551
Roundtrip
found 6 days ago
Select United flight, departing Fri, Oct 3 from Idaho Falls to Watertown, returning Mon, Oct 6, priced at $551 found 6 days ago
United
Fri, Oct 3 - Sat, Oct 11
IDA
Idaho Falls
ATY
Watertown
$628 Roundtrip, found 6 days ago
$628
Roundtrip
found 6 days ago
Select United flight, departing Fri, Oct 3 from Idaho Falls to Watertown, returning Sat, Oct 11, priced at $628 found 6 days ago
United
Fri, Oct 3 - Fri, Oct 10
IDA
Idaho Falls
ATY
Watertown
$630 Roundtrip, found 6 days ago
$630
Roundtrip
found 6 days ago
Select United flight, departing Fri, Oct 3 from Idaho Falls to Watertown, returning Fri, Oct 10, priced at $630 found 6 days ago
United
Thu, Jun 18 - Tue, Jun 23
IDA
Idaho Falls
ATY
Watertown
$713 Roundtrip, found 5 days ago
$713
Roundtrip
found 5 days ago
Select United flight, departing Thu, Jun 18 from Idaho Falls to Watertown, returning Tue, Jun 23, priced at $713 found 5 days ago
United
Sun, Oct 5 - Fri, Oct 10
IDA
Idaho Falls
ATY
Watertown
$736 Roundtrip, found 6 days ago
$736
Roundtrip
found 6 days ago
Select United flight, departing Sun, Oct 5 from Idaho Falls to Watertown, returning Fri, Oct 10, priced at $736 found 6 days ago
United
Fri, Oct 3 - Tue, Oct 7
IDA
Idaho Falls
ATY
Watertown
$738 Roundtrip, found 6 days ago
$738
Roundtrip
found 6 days ago
Select United flight, departing Fri, Oct 3 from Idaho Falls to Watertown, returning Tue, Oct 7, priced at $738 found 6 days ago
United
Sat, Oct 4 - Mon, Oct 6
IDA
Idaho Falls
ATY
Watertown
$746 Roundtrip, found 6 days ago
$746
Roundtrip
found 6 days ago
Select United flight, departing Sat, Oct 4 from Idaho Falls to Watertown, returning Mon, Oct 6, priced at $746 found 6 days ago
United
Sun, Jul 5 - Sun, Jul 12
IDA
Idaho Falls
ATY
Watertown
$749 Roundtrip, found 5 days ago
$749
Roundtrip
found 5 days ago
Select United flight, departing Sun, Jul 5 from Idaho Falls to Watertown, returning Sun, Jul 12, priced at $749 found 5 days ago
Delta
Thu, Jun 18 - Tue, Jun 23
IDA
Idaho Falls
ATY
Watertown
$753 Roundtrip, found 5 days ago
$753
Roundtrip
found 5 days ago
Select Delta flight, departing Thu, Jun 18 from Idaho Falls to Watertown, returning Tue, Jun 23, priced at $753 found 5 days ago
Delta
Thu, Jun 18 - Tue, Jun 23
IDA
Idaho Falls
ATY
Watertown
$779 Roundtrip, found 5 days ago
$779
Roundtrip
found 5 days ago
Select Delta flight, departing Thu, Jun 18 from Idaho Falls to Watertown, returning Tue, Jun 23, priced at $779 found 5 days ago
Delta
Sun, Jul 5 - Sun, Jul 12
IDA
Idaho Falls
ATY
Watertown
$783 Roundtrip, found 5 days ago
$783
Roundtrip
found 5 days ago
Select Delta flight, departing Sun, Jul 5 from Idaho Falls to Watertown, returning Sun, Jul 12, priced at $783 found 5 days ago
United
Thu, Jun 18 - Tue, Jun 23
IDA
Idaho Falls
ATY
Watertown
$785 Roundtrip, found 5 days ago
$785
Roundtrip
found 5 days ago
Select United flight, departing Thu, Jun 18 from Idaho Falls to Watertown, returning Tue, Jun 23, priced at $785 found 5 days ago
Delta
Thu, Jun 18 - Tue, Jun 23
IDA
Idaho Falls
ATY
Watertown
$803 Roundtrip, found 5 days ago
$803
Roundtrip
found 5 days ago
Select Delta flight, departing Thu, Jun 18 from Idaho Falls to Watertown, returning Tue, Jun 23, priced at $803 found 5 days ago
Delta
Thu, Jun 18 - Tue, Jun 23
IDA
Idaho Falls
ATY
Watertown
$829 Roundtrip, found 5 days ago
$829
Roundtrip
found 5 days ago
Select Delta flight, departing Thu, Jun 18 from Idaho Falls to Watertown, returning Tue, Jun 23, priced at $829 found 5 days ago
Alaska Airlines
Thu, Jun 18 - Tue, Jun 23
IDA
Idaho Falls
ATY
Watertown
$859 Roundtrip, found 5 days ago
$859
Roundtrip
found 5 days ago
Select Alaska Airlines flight, departing Thu, Jun 18 from Idaho Falls to Watertown, returning Tue, Jun 23, priced at $859 found 5 days ago

Frequently asked questions

How much does a flight from Idaho Falls Regional Airport (IDA) to Watertown Regional Airport (ATY) cost?
Lock in a cheap one-way flight from $388 or cheap return flight from $551 from Idaho Falls Regional Airport (IDA) to Watertown Regional Airport (ATY) 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 Idaho Falls Regional Airport (IDA) to Watertown Regional Airport (ATY)?
The cheapest month to fly from IDA to ATY is October, when there's less demand. 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 Watertown Regional Airport (ATY)?
Use the filter tool on Expedia to compare airlines and find the cheapest carrier that'll fly you from IDA to ATY. Then, sort your results by "Price (lowest to highest)" to snag the best deal available.
How many flights per day from Idaho Falls Regional Airport (IDA) to Watertown Regional Airport (ATY)?
There are no daily direct flights departing from Idaho Falls Regional Airport (IDA) to Watertown Regional Airport (ATY). But you can book flights with layovers. Filter your search on Expedia to include one or two stops, and you'll be cruising above the clouds in no time.
What day of the week has the most flights from IDA to ATY?
Friday is usually the busiest day for flights, while Tuesday is often the quietest.* Just remember that flight schedules can vary based on various factors, including the airline and season.*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 Watertown Regional Airport (ATY)?
To reach Watertown Regional Airport (ATY) on time, choose a flight that leaves from Idaho Falls Regional Airport (IDA) before 3 PM. The chance 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 Watertown Regional Airport (ATY) last-minute?
Holding off until just before your departure to book a ticket from IDA to ATY generally means paying more. While you may come across some last-minute discounts, they aren't always guaranteed. Be flexible with your itinerary for the best chance of snagging a bargain.
Is it cheaper to book an IDA to ATY flight and hotel package?
You can save money by booking an IDA to ATY flight and hotel package compared to booking separately. In fact, travelers could save hundreds of dollars by bundling with Expedia. And it's easy to manage everything in one convenient place. After choosing your ideal flights and accommodations, you can add extras such as activities, tours and car rentals.
Can I cancel or change the date of my flight from Idaho Falls Regional Airport (IDA) to Watertown Regional Airport (ATY)?
If you booked your IDA to ATY flight within the last 24 hours, you may be able to cancel or modify it at no cost. Depending on the airline and the type of fare you purchased, additional charges may apply for changes beyond that time. Airline policies and contact information can be found in your itinerary or confirmation email. Or, go to our Customer Service portal for more details.

Travel information

Travel information

Origin airport
Idaho Falls Regional
Destination airport
Watertown Regional
Roundtrip price
$550
Distance
743 mi

Book with confidence

Book with confidence

Idaho Falls to Watertown Flights

The cheapest times to fly from Idaho Falls to Watertown

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

 

The best time to book a flight from Idaho Falls to Watertown

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

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 Watertown in 2025. You can also book with separate airlines for your outbound and return journeys, from $388 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 Watertown 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 Watertown 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 Watertown Flights
*Available to One Key members.