Distance between Seattle, WA (BFI) and Portsmouth, NH (PSM)

Flight distance from Seattle to Portsmouth (Seattle Boeing Field – Portsmouth International Airport at Pease) is 2481 miles / 3993 kilometers / 2156 nautical miles. Estimated flight time is 5 hours 11 minutes.

Driving distance from Seattle (BFI) to Portsmouth (PSM) is 3043 miles / 4898 kilometers and travel time by car is about 52 hours 23 minutes.

Map of flight path and driving directions from Seattle to Portsmouth.

Shortest flight path between Seattle Boeing Field (BFI) and Portsmouth International Airport at Pease (PSM).

How far is Portsmouth from Seattle?

There are several ways to calculate distances between Seattle and Portsmouth. Here are two common methods:

Vincenty's formula (applied above)
• 2481.110 miles
• 3992.959 kilometers
• 2156.025 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
• 2474.278 miles
• 3981.965 kilometers
• 2150.089 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 Seattle Boeing Field
City: Seattle, WA
Country: United States
IATA Code: BFI
ICAO Code: KBFI
Coordinates: 47°31′47″N, 122°18′7″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 Seattle and Portsmouth is 3 hours. Portsmouth is 3 hours ahead of Seattle.

PST

EST

Carbon dioxide emissions

Estimated CO2 emissions per passenger is 273 kg (602 pounds).

Frequent Flyer Miles Calculator

Seattle (BFI) → Portsmouth (PSM).

Distance:
2481
Elite level bonus:
0
Booking class bonus:
0

In total

Total frequent flyer miles:
2481

Round trip?