$237 Cheap Flights from Spokane (GEG) to Sidney (SDY)

View $237 flight on Tue, May 12, 2026Opens in a new window

Popular airlines from Spokane International Airport (GEG) to Sidney, MT (SDY-Sidney-Richland Municipal)

  • Be in the know

    Get alerts if flight prices drop or rise*

  • Book smarter

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

  • Earn twice

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

Cheap Flights from Spokane to Sidney (GEG-SDY)

Prices were available within the past 7 days and start at $237 for one-way flights and for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frequently asked questions

How much does a flight from Spokane, WA (GEG-Spokane Intl.) to Sidney, MT (SDY-Sidney-Richland Municipal) cost?
You can find cheap one-way flights from $237 and cheap return flights Spokane, WA (GEG-Spokane Intl.) to Sidney, MT (SDY-Sidney-Richland Municipal) with Expedia. One-way flights typically cost between $432 and $588. 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 the cheapest fares first, and use the Price Tracking tool to receive alerts when Spokane, WA (GEG-Spokane Intl.) to Sidney, MT (SDY-Sidney-Richland Municipal) ticket fares go up or down.*Typical price ranges based on flights available on Expedia in the last year. Prices include multi-airline options.
What is the cheapest month to fly from Spokane, WA (GEG-Spokane Intl.) to Sidney, MT (SDY-Sidney-Richland Municipal)?
The cheapest month to fly from GEG to SDY is 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 Spokane, WA (GEG-Spokane Intl.) to Sidney, MT (SDY-Sidney-Richland Municipal)?
Enter GEG to SDY and your travel dates, then apply the 'Nonstop' filter to see only direct flights.
What is the cheapest airline that flies from Spokane, WA (GEG-Spokane Intl.) to Sidney, MT (SDY-Sidney-Richland Municipal)?
Alaska Airlines, Delta and United are just some of the carriers that fly from Spokane, WA (GEG-Spokane Intl.) to Sidney, MT (SDY-Sidney-Richland Municipal). 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 Spokane, WA (GEG-Spokane Intl.) to Sidney, MT (SDY-Sidney-Richland Municipal)?
To find a cheap flight from Spokane, WA (GEG-Spokane Intl.) 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 Spokane, WA (GEG-Spokane Intl.) 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 Spokane, WA (GEG-Spokane Intl.) to Sidney, MT (SDY-Sidney-Richland Municipal)?
The earliest flight from Spokane International Airport (GEG) to Sidney-Richland Municipal (SDY) usually departs at around 5:05 AM, operated by Alaska Airlines. This is a seasonal service active in June, giving you an early start to your travels. To compare early flights on Expedia, select the "Early Morning" and "Morning" filters in your search.
What day of the week has the most flights from Spokane, WA (GEG-Spokane Intl.) to Sidney, MT (SDY-Sidney-Richland Municipal)?
The busiest day for flights from Spokane Intl. (GEG) to Sidney-Richland Municipal (SDY) is a Tuesday, with around 5 flights. This gives you plenty of options for your travel plans. Major airlines on this route include Alaska Airlines and Delta.
What are the most popular departure times for flights from Spokane, WA (GEG-Spokane Intl.) to Sidney, MT (SDY-Sidney-Richland Municipal)?
The most popular departure times for flights from Spokane (GEG) to Sidney (SDY) are from 6am to 9am. About 33% of passengers prefer this time window. Alaska Airlines operates flights during this period. Many travelers choose this timing for its convenience, allowing for an early start to the day.
How long does it take to fly from Spokane, WA (GEG-Spokane Intl.) to Sidney, MT (SDY-Sidney-Richland Municipal)?
Flights from GEG to SDY with one stop typically take around 13 hours 50 minutes, covering approximately 621 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 Spokane, WA (GEG-Spokane Intl.) to Sidney, MT (SDY-Sidney-Richland Municipal)?
Select the "Business class" and "First class" filters when looking for GEG 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 Spokane, WA (GEG-Spokane Intl.) to Sidney, MT (SDY-Sidney-Richland Municipal) flight with Expedia?
It's easy to earn miles on a Spokane, WA (GEG-Spokane Intl.) 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.
What airports do you fly into for Sidney from Spokane Intl. (GEG)?
From Spokane Intl. (GEG), you can fly typically into Sidney-Richland Municipal (SDY) to reach Sidney. Some flights may connect through major hubs like Seattle - Tacoma Intl. (SEA), Portland Intl. (PDX), Salt Lake City Intl. (SLC) before reaching Sidney. Compare routes and airports on Expedia to find the best flight options for your travel plans.
Is it cheaper to buy a plane ticket from Spokane, WA (GEG-Spokane Intl.) to Sidney, MT (SDY-Sidney-Richland Municipal) at the last minute?
Typically, booking a last minute flight from Spokane, WA (GEG-Spokane Intl.) 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 Spokane, WA (GEG-Spokane Intl.) to Sidney, MT (SDY-Sidney-Richland Municipal) flight and hotel package?
Securing a Spokane, WA (GEG-Spokane Intl.) 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 Spokane, WA (GEG-Spokane Intl.) to Sidney, MT (SDY-Sidney-Richland Municipal)?
If you booked your Spokane, WA (GEG-Spokane Intl.) 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
Spokane Intl.
Destination airport
Sidney-Richland Municipal
Distance
620 mi

Book with confidence

Spokane to Sidney Flights

The cheapest times to fly from Spokane to Sidney

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

 

The best time to book a flight from Spokane to Sidney

Sunday is one of the best days to book for cheap flights from Spokane to Sidney: 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 Spokane to Sidney

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 Spokane to Sidney in 2026. You can also book with separate airlines for your outbound and return journeys, from $237 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 Spokane to Sidney 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 Spokane to Sidney 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.

 

Spokane to Sidney Flights

*Flight schedules are subject to change.

*Available to One Key members.

 

Explore a world of travel with Expedia