The cheapest times to fly from ISN to GEG are

  • January 1st to February 25th
  • August 6th to November 4th
  • early December

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 GEG is mid to late August. Prices can be as high as $1376 for Monday flights during early to mid May, or as low as $306 for Saturday flights around mid to late August.


When to Fly to Spokane

Flying from Williston, ND (ISN) to Spokane, WA (GEG) will usually cost between $417 to $862 per person if booking more than four weeks in advance. On average the very cheapest time to fly is mid to late August with an average ticket price of $480. Due to high demand the most expensive time to fly is early to mid May, with an average price of $1119. Planning your trip to low-cost times can easily save you $639 on economy flights and even more on first-class flights. Generally, any price below $646 can be considered a good price for a round-trip ISN to GEG flight.

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

ISN to GEG Flight Prices

Compared to other flights, the ISN to GEG flight is cheaper than the average and costs less than the average flight leaving from Williston. The average price per mile (for a direct flight) is $0.62, which is above average.


Flight Prices by Day of the Week

Saturday is usually the cheapest day to fly to GEG. Mondays are the most expensive days to fly to Spokane. Selecting flights on the least expensive days could save you up to $90 (12%) on this flight.

Departing prices are for round-trip flights returning on the day of departure. For example, a flight departing on Saturday and returning a week later will cost an average of $560. Return trip prices are from the GEG to ISN flight, and often highlight the quality of our data in showing the same trend.

Departing Prices by Day

Departure Day Prices


Nonstop Flights and Layovers

Travelers looking to fly from ISN to GEG 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 8 minutes may not be realistic.


Flight Questions Answered

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

Which airlines fly this route?

You can find 3 major airlines flying this route most often: Alaska, Delta, United, and potentially more during busy seasons.

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

The distance between the two airports is roughly 644 miles or 1036 kilometers.

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

The real-world flight time for a nonstop ISN to GEG flight is about 2 hour 8 minutes.

How many flights go between Williston, ND and Spokane, WA?

It depends on the day of the week and the date, but a typical day might have around 76 available flights from ISN to GEG.


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 GEG
Destination airport name Spokane International Airport
City Spokane, WA
Country the United States
Latitude 47.6
Longitude -117.5


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.