The cheapest times to fly from SDY to RKS are

  • April 16th to May 13th (except the week of April 30th)
  • October 15th to April 1st (except the weeks of December 17th and February 12th)

based on data collected exclusively by Champion Traveler across tens of millions of flights. Among all the dates above, the very cheapest time to fly from SDY to RKS is early December. Prices can be as high as $717 for Saturday flights during early August, or as low as $643 for Sunday flights around early December.


When to Fly to Rock Springs

Flying from Sidney, MT (SDY) to Rock Springs, WY (RKS) will usually cost between $643 to $705 per person if booking more than four weeks in advance. On average the very cheapest time to fly is early December with an average ticket price of $643. Due to high demand the most expensive time to fly is early August, with an average price of $674. Planning your trip to low-cost times can easily save you $31 on economy flights and even more on first-class flights. Generally, any price below $653 can be considered a good price for a round-trip SDY to RKS flight.

See below for a graph of average weekly prices for the SDY to RKS route. All prices are for round-trip tickets in USD.

SDY to RKS Flight Prices

Compared to other flights, the SDY to RKS flight is cheaper than the average and costs much less than the average flight leaving from Sidney. The average price per mile (for a direct flight) is $0.84, which is above average.


Flight Prices by Day of the Week

Sunday is usually the cheapest day to fly to RKS, and Tuesday the cheapest day to fly back into SDY. Saturdays are the most expensive days to fly out or take a return trip. Selecting flights on the least expensive days could save you up to $25 (4%) on this flight.

Departing prices are for round-trip flights returning on the day of departure. For example, a flight departing on Sunday and returning a week later will cost an average of $644. Return trip prices are from the RKS to SDY flight, and often highlight the quality of our data in showing the same trend.

Departing Prices by Day

Departure Day Prices

Return Trip Prices by Day

Return Day Prices


Nonstop Flights and Layovers

Travelers looking to fly from SDY to RKS can generally find a 2-layover flight. Because there is not usually a direct flight option the real-world direct flight time of 1 hour 51 minutes may not be realistic.


Flight Questions Answered

Still have questions about flying from SDY to RKS? We’ve got answers.

Which airlines fly this route?

You can find 4 major airlines flying this route most often: American, Cape Air, Delta, United, and potentially more during busy seasons.

How far away is it from Rock Springs Sweetwater County Airport to Sidney Richland Regional Airport?

The distance between the two airports is roughly 485 miles or 781 kilometers.

How long does it take to fly from SDY to RKS?

The real-world flight time for a nonstop SDY to RKS flight is about 1 hour 51 minutes.

How many flights go between Sidney, MT and Rock Springs, WY?

It depends on the day of the week and the date, but a typical day might have around 13 available flights from SDY to RKS.


Airport Location Info


Departing Airport

Origination codeSDY
Origination airport nameSidney Richland Regional Airport
CitySidney, MT
Countrythe United States

Return Airport

Destination codeRKS
Destination airport nameRock Springs Sweetwater County Airport
CityRock Springs, WY
Countrythe United States


Other Resources

Please note that while we’ve worked hard to analyzed tens of millions of flights to get you this data, we do not calculate current live prices or guarantee pricing. Please see our partners using the links above for current offers.