Cheap Flights from SMF to ISN: When to Fly from Sacramento to Williston

The cheapest times to fly from SMF to ISN are

• August 6th to November 4th (except the week of October 8th)
• December 24th to February 25th

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 SMF to ISN is late January. Prices can be as high as $1320 for Monday flights during early to mid May, or as low as $330 for Saturday flights around late January.

When to Fly to Williston

Flying from Sacramento, CA (SMF) to Williston, ND (ISN) will usually cost between $398 to $800 per person if booking more than four weeks in advance. On average the very cheapest time to fly is late January with an average ticket price of $463. Due to high demand the most expensive time to fly is early to mid May, with an average price of $878. Planning your trip to low-cost times can easily save you $414 on economy flights and even more on first-class flights. Generally, any price below $554 can be considered a good price for a round-trip SMF to ISN flight.

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

Compared to other flights, the SMF to ISN flight is cheaper than the average and costs less than the average flight leaving from Sacramento. The average price per mile (for a direct flight) is $0.31, which is in the normal range for a flight.

Flight Prices by Day of the Week

Saturday is usually the cheapest day to fly to ISN. Mondays are the most expensive days to fly to Williston. Selecting flights on the least expensive days could save you up to $87 (13%) 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 $491. Return trip prices are from the ISN to SMF flight, and often highlight the quality of our data in showing the same trend.