The cheapest times to fly from IAH to ISN are

  • January 8th to February 25th
  • April 16th to May 20th
  • August 13th to November 4th (except the weeks of October 8th and October 15th)

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 IAH to ISN is mid May. Prices can be as high as $1015 for Monday flights during mid July, or as low as $326 for Wednesday flights around mid May.


When to Fly to Williston

Flying from Houston, TX (IAH) to Williston, ND (ISN) will usually cost between $370 to $730 per person if booking more than four weeks in advance. On average the very cheapest time to fly is mid May with an average ticket price of $390. Due to high demand the most expensive time to fly is mid July, with an average price of $735. Planning your trip to low-cost times can easily save you $345 on economy flights and even more on first-class flights. Generally, any price below $490 can be considered a good price for a round-trip IAH to ISN flight.

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

IAH to ISN Flight Prices

Compared to other flights, the IAH to ISN flight is much cheaper than the average and costs much less than the average flight leaving from Houston. The average price per mile (for a direct flight) is $0.23, which is below average.


Flight Prices by Day of the Week

Wednesday is usually the cheapest day to depart and return on this flight. 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 $164 (27%) 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 $447. Return trip prices are from the ISN to IAH 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 IAH to ISN can generally find a 1-layover flight. Because there is not usually a direct flight option the real-world direct flight time of 3 hour 23 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 IAH to ISN while comparing.

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

  • 109 miles (175 km) away from ISN
  • Usually 9.80% less expensive than ISN
  • 1-layover flights available

See IAH to MOT flights


Flight Questions Answered

Still have questions about flying from IAH to ISN? 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 Sloulin Field International Airport to George Bush Intercontinental/Houston Airport?

The distance between the two airports is roughly 1331 miles or 2142 kilometers.

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

The real-world flight time for a nonstop IAH to ISN flight is about 3 hour 23 minutes.

How many flights go between Houston, TX and Williston, ND?

It depends on the day of the week and the date, but a typical day might have around 40 available flights from IAH to ISN.


Airport Location Info


Departing Airport

Origination code IAH
Origination airport name George Bush Intercontinental/Houston Airport
City Houston, TX
Country the United States
Latitude 30
Longitude -95.3

Return Airport

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


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.