The flight distance from Montgomery County Airpark (GAI) in Gaithersburg, United States to Seattle-Tacoma International Airport (SEA) in Seattle, United States is 3,711 kilometers (2,306 miles / 2,004 nautical miles). The estimated flight time for this route is approximately 5h, flying west northwest at a heading of 299°.

This is a medium-haul route that may be operated by either narrow-body or wide-body aircraft depending on demand. Passengers can expect a meal service on most carriers.

This is a domestic route within United States. Both airports operate in the same country, which may simplify travel requirements and documentation. Despite being a domestic route, there is a 3-hour time difference between the two cities.

Time zone information: When it's 00:11 in Gaithersburg, it's 21:11 in Seattle. The 3-hour time difference may cause some jet lag. Most travelers adjust within a day or two.

The return flight from Seattle (SEA) to Gaithersburg (GAI) follows a heading of 87° (east). Actual flight times may vary depending on wind conditions, air traffic, and the specific aircraft used.

For more information about these airports, visit the Montgomery County Airpark (GAI) and Seattle-Tacoma International Airport (SEA) detail pages, or use our flight duration calculator to compare other routes.