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)
- 873.835 miles
- 1406.301 kilometers
- 759.342 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
- 871.546 miles
- 1402.618 kilometers
- 757.353 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).
Estimated flight time from O'Hare International Airport (ORD) to Portsmouth International Airport at Pease (PSM) is 2 hours 9 minutes.
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 (312 pounds).
Chicago to Portsmouth flight map.
Frequent Flyer Miles Calculator
Chicago (ORD) → Portsmouth (PSM).