# Distance between Chicago, IL (MDW) and Portsmouth, NH (PSM)

Flight distance from Chicago to Portsmouth (Chicago Midway International Airport – Portsmouth International Airport at Pease) is 869 miles / 1398 kilometers / 755 nautical miles. Estimated flight time is 2 hours 8 minutes.

Driving distance from Chicago (MDW) to Portsmouth (PSM) is 1043 miles / 1679 kilometers and travel time by car is about 18 hours 38 minutes.

## 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).

## Airport information

A Chicago Midway International Airport
City: Chicago, IL
Country: United States
IATA Code: MDW
ICAO Code: KMDW
Coordinates: 41°47′9″N, 87°45′8″W

B Portsmouth International Airport at Pease
City: Portsmouth, NH
Country: United States
IATA Code: PSM
ICAO Code: KPSM
Coordinates: 43°4′40″N, 70°49′23″W

## Time difference and current local times

The time difference between Chicago and Portsmouth is 1 hour. Portsmouth is 1 hour ahead of Chicago.

CDT

EDT

## Carbon dioxide emissions

Estimated CO2 emissions per passenger is 141 kg (311 pounds).

## Frequent Flyer Miles Calculator

Chicago (MDW) → Portsmouth (PSM).

Distance:
869
Elite level bonus:
0
Booking class bonus:
0

### In total

Total frequent flyer miles:
869

Round trip?