Cheap Flights from Rock Springs (RKS) to Sidney (SDY)

Popular airlines from Rock Springs, WY (RKS-Sweetwater County) to Sidney, MT (SDY-Sidney-Richland Municipal)

  • notification illustration

    Be in the know

    Get alerts if flight prices drop or rise*
  • deals illustration

    Book smarter

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

    Earn twice

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

Frequently asked questions

How much does a flight from Sweetwater County Airport (RKS) to Sidney-Richland Municipal Airport (SDY) cost?
Secure a cheap one-way flight or cheap return flight from Sweetwater County Airport (RKS) 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 Sweetwater County Airport (RKS) to Sidney-Richland Municipal Airport (SDY)?
The cheapest month to fly from RKS to SDY is , when there's less demand. Off-peak season is often when airlines offer lower prices between these airports.
What is the cheapest airline that flies from Sweetwater County Airport (RKS) to Sidney-Richland Municipal Airport (SDY)?
To find the cheapest airline that'll fly you from RKS to SDY, use Expedia's filter tool. Tailor your search based on what matters most to you, such as preferred carriers and flight duration. You can then sort your results by "Price (lowest to highest)" to see the cheapest flights first.
How many flights per day from Sweetwater County Airport (RKS) to Sidney-Richland Municipal Airport (SDY)?
Direct flights from Sweetwater County Airport (RKS) to Sidney-Richland Municipal Airport (SDY) aren't available daily, so you'll have to take a flight with a layover. Explore your options with Expedia's filters. Enter your travel dates and pick either "1 Stop" or "2+ Stops."
What day of the week has the most flights from RKS to SDY?
You'll generally find Tuesday the quietest day for flights, while Fridays are often the busiest.* However this can vary from season to season and during peak travel times or public holidays.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Sweetwater County Airport (RKS) to Sidney-Richland Municipal Airport (SDY)?
To avoid potential delays on the Sweetwater County Airport (RKS) to Sidney-Richland Municipal Airport (SDY) route, aim to travel before 3 PM. Flights 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 Sweetwater County Airport (RKS) to Sidney-Richland Municipal Airport (SDY) last-minute?
Booking your plane ticket from RKS to SDY right before your journey is typically more expensive. However, if there's some wiggle room with your departure dates and times, you could snag a cheap last-minute fare.
Is it cheaper to book a RKS to SDY flight and hotel package?
Compared with arranging hotels and flights separately, booking a RKS to SDY flight and hotel package with Expedia could result in significant savings. Better still, having everything in one place will take the hassle out of travel planning. Just pick your flights and select from our wide range of hotels, then customize your trip with other add-ons like tours, activities and car rentals.
Can I cancel or change the date of my flight from Sweetwater County Airport (RKS) to Sidney-Richland Municipal Airport (SDY)?
In most instances, you can cancel or reschedule your RKS to SDY flight. However, there may be additional fees, especially if your booking was made over 24 hours ago. Double-check your itinerary for the airline's rules and fees on flight changes, or if you want more information, head to our Customer Service portal.

Travel information

Origin airport
Sweetwater County
Destination airport
Sidney-Richland Municipal
Distance
485 mi

Book with confidence

Rock Springs to Sidney Flights

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

 

The best time to book a flight from Rock Springs to Sidney

Sunday is one of the best days to book for cheap flights from Rock Springs 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 Rock Springs 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 Rock Springs to Sidney in 2025. You can also book with separate airlines for your outbound and return journeys, from 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 Rock Springs 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 Rock Springs 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.

 

Rock Springs to Sidney Flights

Explore a world of travel with Expedia

*Available to One Key members.