The cheapest times to fly from ISN to DSM are

  • January 1st to February 25th
  • March 26th to April 8th
  • April 30th to May 13th
  • August 13th to September 30th (except the week of August 27th)

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 ISN to DSM is early to mid May. Prices can be as high as $753 for Monday flights during early March, or as low as $310 for Tuesday flights around early to mid May.


When to Fly to Des Moines

Flying from Williston, ND (ISN) to Des Moines, IA (DSM) will usually cost between $320 to $573 per person if booking more than four weeks in advance. On average the very cheapest time to fly is early to mid May with an average ticket price of $330. Due to high demand the most expensive time to fly is early March, with an average price of $561. Planning your trip to low-cost times can easily save you $231 on economy flights and even more on first-class flights. Generally, any price below $400 can be considered a good price for a round-trip ISN to DSM flight.

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

ISN to DSM Flight Prices

Compared to other flights, the ISN to DSM flight is much cheaper than the average and costs much less than the average flight leaving from Williston. The average price per mile (for a direct flight) is $0.37, which is a bit above average.


Flight Prices by Day of the Week

Tuesday is usually the cheapest day to fly to DSM, and Saturday the cheapest day to fly back into ISN. Mondays 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 $101 (21%) on this flight.

Departing prices are for round-trip flights returning on the day of departure. For example, a flight departing on Tuesday and returning a week later will cost an average of $379. Return trip prices are from the DSM to ISN 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 ISN to DSM can generally find a 1-layover flight. Because there is not usually a direct flight option the real-world direct flight time of 2 hour 11 minutes may not be realistic.


Flight Questions Answered

Still have questions about flying from ISN to DSM? We’ve got answers.

Which airlines fly this route?

You can find 2 major airlines flying this route most often: Delta, United, and potentially more during busy seasons.

How far away is it from Des Moines International Airport to Sloulin Field International Airport?

The distance between the two airports is roughly 670 miles or 1078 kilometers.

How long does it take to fly from ISN to DSM?

The real-world flight time for a nonstop ISN to DSM flight is about 2 hour 11 minutes.

How many flights go between Williston, ND and Des Moines, IA?

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


Airport Location Info


Departing Airport

Origination code ISN
Origination airport name Sloulin Field International Airport
City Williston, ND
Country the United States
Latitude 48.2
Longitude -103.6

Return Airport

Destination code DSM
Destination airport name Des Moines International Airport
City Des Moines, IA
Country the United States
Latitude 41.5
Longitude -93.7


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.