$251 Cheap Flights from Idaho Falls (IDA) to Sidney (SDY)

View $251 flight on Wed, May 27, 2026Opens in a new window

Popular airlines from Idaho Falls Regional Airport (IDA) to Sidney, MT (SDY-Sidney-Richland Municipal)

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Cheap Flights from Idaho Falls to Sidney (IDA-SDY)

Prices were available within the past 7 days and start at $251 for one-way flights and $1,035 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Alaska Airlines
Thu, Apr 30 - Sat, May 2
IDA
Idaho Falls
SDY
Sidney
$1,035 Roundtrip, found 4 days ago
$1,035
Roundtrip
found 4 days ago
Select Alaska Airlines flight, departing Thu, Apr 30 from Idaho Falls to Sidney, returning Sat, May 2, priced at $1,035 found 4 days ago

Frequently asked questions

How much does a flight from Idaho Falls, ID (IDA-Idaho Falls Regional) to Sidney, MT (SDY-Sidney-Richland Municipal) cost?
You can find cheap one-way flights from $251 and cheap return flights from $1,035 IDA to SDY with Expedia. Flight prices vary based on the month and day of the week you want to travel, as well as the airline and how far in advance you book your ticket. Filter your search on Expedia by "Price (lowest to highest)" to see our cheapest fares first, and use the Price Tracking tool to receive alerts when IDA to SDY ticket fares go up or down.
What is the cheapest month to fly from Idaho Falls, ID (IDA-Idaho Falls Regional) to Sidney, MT (SDY-Sidney-Richland Municipal)?
The cheapest month to fly from IDA to SDY is April when demand is low. Traveling in off-peak or shoulder months is usually a good way to secure cheap tickets, just remember to avoid flying during holidays if you're able to. Use the calendar view in your search to see which months have low fares on this route.
Which airlines fly direct from Idaho Falls, ID (IDA-Idaho Falls Regional) to Sidney, MT (SDY-Sidney-Richland Municipal)?
Enter IDA to SDY and your travel dates, then apply the 'Nonstop' filter to see only direct flights.
What is the cheapest airline that flies from Idaho Falls, ID (IDA-Idaho Falls Regional) to Sidney, MT (SDY-Sidney-Richland Municipal)?
Alaska Airlines, Delta and United are just some of the carriers that fly from Idaho Falls, ID (IDA) to Sidney, MT (SDY). Use Expedia's flight search tool to compare airlines on this route and find our cheapest option for your trip. Use Expedia's search tool to compare the prices and schedules of airlines that fly this route to find the best option for your plans and budget.*Prices based on flights available on Expedia in the last year.
How do I find cheap flights from Idaho Falls, ID (IDA-Idaho Falls Regional) to Sidney, MT (SDY-Sidney-Richland Municipal)?
To find a cheap flight from Idaho Falls, ID (IDA-Idaho Falls Regional) to Sidney, MT (SDY-Sidney-Richland Municipal), be flexible with your dates. Traveling outside of peak vacation months and booking a mid-week flight can help you save. Early morning and late night flights are often more affordable, too. Expedia allows you to compare flight times, airlines and routes all in one place to find low fares. You can also set up Price Tracking and receive alerts when fares go up or down.
What is the best time to fly from Idaho Falls, ID (IDA-Idaho Falls Regional) to Sidney, MT (SDY-Sidney-Richland Municipal)?
The best time to fly is usually mid-week (Tuesday or Wednesday) and during early morning hours as flights tend to be cheaper, less crowded, and generally more on-time. Avoid major holidays and peak vacation seasons for smoother travel. Combining off-peak days and hours often gives the best combination of cost, comfort, and convenience.
What is the earliest flight from Idaho Falls, ID (IDA-Idaho Falls Regional) to Sidney, MT (SDY-Sidney-Richland Municipal)?
Sort flights by "Departure (earliest)" on Expedia to find the earliest flight from IDA to SDY. To compare more early flights, use the "Early Morning" and "Morning" filters in your search.
How long does it take to fly from Idaho Falls, ID (IDA-Idaho Falls Regional) to Sidney, MT (SDY-Sidney-Richland Municipal)?
A flight from IDA to SDY with a layover takes around 9 hours, with the route covering approximately 478 miles. Keep in mind that actual flight times can vary due to wind patterns, weather, and air traffic.
Can you fly business or first class from Idaho Falls, ID (IDA-Idaho Falls Regional) to Sidney, MT (SDY-Sidney-Richland Municipal)?
Select the "Business class" and "First class" filters when looking for IDA to SDY flights on Expedia. This is the easiest way to compare prices, routes and flight times for your trip.
How do I earn miles on a Idaho Falls, ID (IDA-Idaho Falls Regional) to Sidney, MT (SDY-Sidney-Richland Municipal) flight with Expedia?
It's easy to earn miles on a Idaho Falls, ID (IDA-Idaho Falls Regional) to Sidney, MT (SDY-Sidney-Richland Municipal) flight when you book with Expedia. Before you confirm your booking, simply select your frequent flyer program and enter your program number. As a member of One Key™, you can also earn OneKeyCash™* on top of your airline miles when you book with Expedia.*Excludes taxes and fees. OneKeyCash is not redeemable for cash and can only be used on Expedia and other participating brands.
Is it cheaper to buy a plane ticket from Idaho Falls, ID (IDA-Idaho Falls Regional) to Sidney, MT (SDY-Sidney-Richland Municipal) at the last minute?
Typically, booking a last minute flight from Idaho Falls, ID (IDA-Idaho Falls Regional) to Sidney, MT (SDY-Sidney-Richland Municipal) will be more expensive than booking in advance. As the departure date approaches, there are usually fewer seats available which can drive up the cost. However, if there's some wiggle room with your travel dates and times, you could bag a cheap last-minute fare.
Is it cheaper to book a Idaho Falls, ID (IDA-Idaho Falls Regional) to Sidney, MT (SDY-Sidney-Richland Municipal) flight and hotel package?
Securing a Idaho Falls, ID (IDA-Idaho Falls Regional) to Sidney, MT (SDY-Sidney-Richland Municipal) flight and hotel package is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Select from our extensive range of stays and then add flights, activities and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Idaho Falls, ID (IDA-Idaho Falls Regional) to Sidney, MT (SDY-Sidney-Richland Municipal)?
If you booked your Idaho Falls, ID (IDA-Idaho Falls Regional) to Sidney, MT (SDY-Sidney-Richland Municipal) flight within the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of ticket you have, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you'd like more information.

Travel information

Origin airport
Idaho Falls Regional
Destination airport
Sidney-Richland Municipal
Roundtrip price
$1,034
Distance
478 mi

*Flight schedules are subject to change.

*Available to One Key members.

 

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