Map of flight path and driving directions from Chicago to Portsmouth.
Shortest flight path between Chicago Midway International Airport (MDW) and Portsmouth International Airport at Pease (PSM).
How far is Portsmouth from Chicago?
There are several ways to calculate distances between Chicago and Portsmouth. Here are two common methods:Vincenty's formula (applied above)
- 868.694 miles
- 1398.028 kilometers
- 754.875 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
- 866.434 miles
- 1394.390 kilometers
- 752.910 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).
Time difference and current local times
The time difference between Chicago and Portsmouth is 1 hour. Portsmouth is 1 hour ahead of Chicago.
Carbon dioxide emissions
Estimated CO2 emissions per passenger is 141 kg (311 pounds).
Frequent Flyer Miles Calculator
Chicago (MDW) → Portsmouth (PSM).