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.
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Seattle - Portsmouth
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.
Time Difference
Seattle, WA
Portsmouth, NH
Carbon dioxide emissions
Estimated CO2 emissions per passenger is 273 kg (602 pounds).
Frequent Flyer Miles Calculator
Seattle (BFI) → Portsmouth (PSM).
In total
Round trip?