$252 Cheap Flights from Spokane (GEG) to Sidney (SDY)

View $252 flight on Thu, May 14, 2026Opens in a new window

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

Cheap Flights from Spokane to Sidney (GEG-SDY)

Prices were available within the past 7 days and start at $252 for one-way flights and $431 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Hawaiian Airlines
Sat, Dec 6 - Tue, Dec 9
GEG
Spokane
SDY
Sidney
$431 Roundtrip, found 3 days ago
$431
Roundtrip
found 3 days ago
Select Hawaiian Airlines flight, departing Sat, Dec 6 from Spokane to Sidney, returning Tue, Dec 9, priced at $431 found 3 days ago
Delta
Tue, Dec 2 - Wed, Dec 3
GEG
Spokane
SDY
Sidney
$444 Roundtrip, found 3 days ago
$444
Roundtrip
found 3 days ago
Select Delta flight, departing Tue, Dec 2 from Spokane to Sidney, returning Wed, Dec 3, priced at $444 found 3 days ago
Delta
Wed, Dec 3 - Sat, Dec 6
GEG
Spokane
SDY
Sidney
$445 Roundtrip, found 3 days ago
$445
Roundtrip
found 3 days ago
Select Delta flight, departing Wed, Dec 3 from Spokane to Sidney, returning Sat, Dec 6, priced at $445 found 3 days ago
Alaska Airlines
Wed, Dec 3 - Sat, Dec 6
GEG
Spokane
SDY
Sidney
$448 Roundtrip, found 3 days ago
$448
Roundtrip
found 3 days ago
Select Alaska Airlines flight, departing Wed, Dec 3 from Spokane to Sidney, returning Sat, Dec 6, priced at $448 found 3 days ago
Hawaiian Airlines
Sat, Dec 6 - Sun, Dec 7
GEG
Spokane
SDY
Sidney
$460 Roundtrip, found 3 days ago
$460
Roundtrip
found 3 days ago
Select Hawaiian Airlines flight, departing Sat, Dec 6 from Spokane to Sidney, returning Sun, Dec 7, priced at $460 found 3 days ago
United
Fri, Nov 28 - Tue, Dec 16
GEG
Spokane
SDY
Sidney
$464 Roundtrip, found 2 days ago
$464
Roundtrip
found 2 days ago
Select United flight, departing Fri, Nov 28 from Spokane to Sidney, returning Tue, Dec 16, priced at $464 found 2 days ago
Alaska Airlines
Wed, Dec 3 - Sat, Dec 6
GEG
Spokane
SDY
Sidney
$464 Roundtrip, found 3 days ago
$464
Roundtrip
found 3 days ago
Select Alaska Airlines flight, departing Wed, Dec 3 from Spokane to Sidney, returning Sat, Dec 6, priced at $464 found 3 days ago
Alaska Airlines
Thu, Nov 27 - Wed, Dec 10
GEG
Spokane
SDY
Sidney
$477 Roundtrip, found 2 days ago
$477
Roundtrip
found 2 days ago
Select Alaska Airlines flight, departing Thu, Nov 27 from Spokane to Sidney, returning Wed, Dec 10, priced at $477 found 2 days ago
United
Fri, Nov 28 - Thu, Dec 4
GEG
Spokane
SDY
Sidney
$484 Roundtrip, found 2 days ago
$484
Roundtrip
found 2 days ago
Select United flight, departing Fri, Nov 28 from Spokane to Sidney, returning Thu, Dec 4, priced at $484 found 2 days ago
Alaska Airlines
Wed, Dec 3 - Sat, Dec 6
GEG
Spokane
SDY
Sidney
$484 Roundtrip, found 3 days ago
$484
Roundtrip
found 3 days ago
Select Alaska Airlines flight, departing Wed, Dec 3 from Spokane to Sidney, returning Sat, Dec 6, priced at $484 found 3 days ago

Frequently asked questions

How much does a flight from Spokane Intl. Airport (GEG) to Sidney-Richland Municipal Airport (SDY) cost?
Get a cheap one-way flight from $252 or cheap return flight from $431 from Spokane Intl. Airport (GEG) to Sidney-Richland Municipal Airport (SDY) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight offers on this route.
What is the cheapest month to fly from Spokane Intl. Airport (GEG) to Sidney-Richland Municipal Airport (SDY)?
The cheapest month to fly from GEG to SDY is December, when demand is low. Off-peak season is usually when you'll find lower airfares between these airports.
What is the cheapest airline that flies from Spokane Intl. Airport (GEG) to Sidney-Richland Municipal Airport (SDY)?
To find the cheapest airline that'll fly you from GEG to SDY, use Expedia's filter tool. Customize your search based on your travel needs, such as preferred carriers and number of stops. You can then sort your results by "Price (lowest to highest)" to see the cheapest flights first.
How many flights per day from Spokane Intl. Airport (GEG) to Sidney-Richland Municipal Airport (SDY)?
You'll need to take a flight with a layover when traveling from Spokane Intl. Airport (GEG) to Sidney-Richland Municipal Airport (SDY). There are no daily direct flights on this route. However, just filter your search to include one or more stops to discover the best option for your trip.
What day of the week has the most flights from GEG to SDY?
Friday is usually the busiest day for flights, while Tuesday is often the quietest.* Keep in mind that flight schedules can change based on a number of factors, including the time of year 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 Spokane Intl. Airport (GEG) to Sidney-Richland Municipal Airport (SDY)?
To avoid potential delays on the Spokane Intl. Airport (GEG) to Sidney-Richland Municipal Airport (SDY) route, fly before 3 PM. Departures after this time have a 22% higher chance of cancellation.**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 Spokane Intl. Airport (GEG) to Sidney-Richland Municipal Airport (SDY) last-minute?
Last-minute bookings from GEG to SDY are generally more expensive. To lock in the best rates, start looking for flights early. That being said, if you can play around with your travel dates, it's possible to score a cheap fare right before your trip.
Is it cheaper to book a GEG to SDY flight and hotel package?
Opting for a GEG to SDY flight and hotel package tends to be cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Select from our wide range of hotels and then add car rentals, flights and activities 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 Spokane Intl. Airport (GEG) to Sidney-Richland Municipal Airport (SDY)?
You can usually cancel or reschedule your GEG to SDY flight. However, if it's been more than 24 hours since booking, additional fees may apply. Check your airline's policies in your itinerary to see what changes are possible and if any costs are involved. You'll also find more details on our Customer Service portal.

Travel information

Origin airport
Spokane Intl.
Destination airport
Sidney-Richland Municipal
Roundtrip price
$431
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 December. 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 2025. You can also book with separate airlines for your outbound and return journeys, from $252 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

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*Available to One Key members.