The cheapest times to fly from DEN to SDY are

  • January 1st to March 4th
  • April 16th to June 17th (except the week of May 7th)
  • July 2nd to July 15th
  • October 8th to December 9th (except the weeks of October 15th and November 26th)

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 DEN to SDY is mid February. Prices can be as high as $846 for Saturday flights during early to mid May, or as low as $484 for Wednesday flights around mid February.


When to Fly to Sidney

Flying from Denver, CO (DEN) to Sidney, MT (SDY) will usually cost between $517 to $846 per person if booking more than four weeks in advance. On average the very cheapest time to fly is mid February with an average ticket price of $523. Due to high demand the most expensive time to fly is early to mid May, with an average price of $583. Planning your trip to low-cost times can easily save you $60 on economy flights and even more on first-class flights. Generally, any price below $563 can be considered a good price for a round-trip DEN to SDY flight.

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

DEN to SDY Flight Prices

Compared to other flights, the DEN to SDY flight is cheaper than the average and costs less than the average flight leaving from Denver. The average price per mile (for a direct flight) is $0.65, which is above average.


Flight Prices by Day of the Week

Wednesday is usually the cheapest day to fly to SDY, and Tuesday the cheapest day to fly back into DEN. Saturdays are the most expensive days to fly to Sidney, and Sundays are the most expensive days to return to Denver. Selecting flights on the least expensive days could save you up to $21 (4%) on this flight.

Departing prices are for round-trip flights returning on the day of departure. For example, a flight departing on Wednesday and returning a week later will cost an average of $551. Return trip prices are from the SDY to DEN 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 DEN to SDY can generally find a 1-layover flight. Because there is not usually a direct flight option the real-world direct flight time of 1 hour 57 minutes may not be realistic.


Alternative Nearby Airports

Champion Traveler tells you which airports are nearby and whether tickets might be cheaper alternative airports nearby. Sometimes it’s worth it to fly into a closer airport and then commute to your destination. Remember that there is not usually a nonstop flight from DEN to SDY while comparing.

Destination alternative #1: Minot International Airport (MOT) in Minot, ND

  • 140 miles (225 km) away from SDY
  • Usually 31.56% less expensive than SDY
  • Nonstop flights available

See DEN to MOT flights

Destination alternative #2: Dickinson – Theodore Roosevelt Regional Airport (DIK) in Dickinson, ND

  • 91 miles (146 km) away from SDY
  • Usually 26.49% less expensive than SDY
  • Nonstop flights available

See DEN to DIK flights

Destination alternative #3: Sloulin Field International Airport (ISN) in Williston, ND

  • 41 miles (66 km) away from SDY
  • Usually 19.64% less expensive than SDY
  • Nonstop flights available

See DEN to ISN flights


Flight Hacking DEN to SDY

Flight hacking is when you book two tickets instead of a layover, sometimes with different airlines. You will need to either bring only a carry-on bag (highly recommended) or leave yourself plenty of time to go through security again. Flight hacking is completely allowed, but airlines don’t always tell you the cheapest way to get from DEN to SDY — but Champion Traveler does!

Hack #1: Billings, MT (DEN > BIL > SDY)

  • Price for both tickets: $393
  • Average savings: $170 (30.13%)

See DEN to BIL flights


Flight Questions Answered

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

Which airlines fly this route?

You can find 6 major airlines flying this route most often: Alaska, American, Cape Air, Delta, Frontier, United, and potentially more during busy seasons.

How far away is it from Sidney Richland Regional Airport to Denver International Airport?

The distance between the two airports is roughly 542 miles or 872 kilometers.

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

The real-world flight time for a nonstop DEN to SDY flight is about 1 hour 57 minutes.

How many flights go between Denver, CO and Sidney, MT?

It depends on the day of the week and the date, but a typical day might have around 18 available flights from DEN to SDY.


Airport Location Info


Departing Airport

Origination codeDEN
Origination airport nameDenver International Airport
CityDenver, CO
Countrythe United States

Return Airport

Destination codeSDY
Destination airport nameSidney Richland Regional Airport
CitySidney, MT
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.