Air Miles Calculator

Distance between Rock Springs, WY (RKS) and Fort Smith, AR (FSM)

Flight distance from Rock Springs to Fort Smith (Southwest Wyoming Regional Airport – Fort Smith Regional Airport) is 905 miles / 1456 kilometers / 786 nautical miles. Estimated flight time is 2 hours 12 minutes.

Driving distance from Rock Springs (RKS) to Fort Smith (FSM) is 1160 miles / 1867 kilometers and travel time by car is about 18 hours 57 minutes.

Map of flight path and driving directions from Rock Springs to Fort Smith.

Shortest flight path between Southwest Wyoming Regional Airport (RKS) and Fort Smith Regional Airport (FSM).

How far is Fort Smith from Rock Springs?

There are several ways to calculate distances between Rock Springs and Fort Smith. Here are two common methods:

Vincenty's formula (applied above)
  • 904.655 miles
  • 1455.901 kilometers
  • 786.124 nautical miles

Vincenty's formula calculates the distance between latitude/longitude points on the earth’s surface, using an ellipsoidal model of the earth.

Haversine formula
  • 903.324 miles
  • 1453.759 kilometers
  • 784.967 nautical miles

The haversine formula calculates the distance between latitude/longitude points assuming a spherical earth (great-circle distance – the shortest distance between two points).

Airport information


A Southwest Wyoming Regional Airport
City: Rock Springs, WY
Country: United States Flag of United States
IATA Code: RKS
ICAO Code: KRKS
Coordinates: 41°35′39″N, 109°3′54″W

B Fort Smith Regional Airport
City: Fort Smith, AR
Country: United States Flag of United States
IATA Code: FSM
ICAO Code: KFSM
Coordinates: 35°20′11″N, 94°22′2″W

Time difference and current local times

The time difference between Rock Springs and Fort Smith is 1 hour. Fort Smith is 1 hour ahead of Rock Springs.

Time Difference

Rock Springs, WY

 MDT

Fort Smith, AR

 CDT

Carbon dioxide emissions

Estimated CO2 emissions per passenger is 144 kg (317 pounds).

Frequent Flyer Miles Calculator

Rock Springs (RKS) → Fort Smith (FSM).

Distance:
905
Elite level bonus:
0
Booking class bonus:
0

In total

Total frequent flyer miles:
905

Round trip?