The flight distance from Seattle-Tacoma International Airport (SEA) in Seattle, United States to Northeast Florida Regional Airport (UST) in St Augustine, United States is 3,990 kilometers (2,479 miles / 2,154 nautical miles). The estimated flight time for this route is approximately 6h, flying east southeast at a heading of 104°.

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 23:18 in Seattle, it's 02:18 in St Augustine. The 3-hour time difference may cause some jet lag. Most travelers adjust within a day or two.

The return flight from St Augustine (UST) to Seattle (SEA) follows a heading of 311° (northwest). Actual flight times may vary depending on wind conditions, air traffic, and the specific aircraft used.

For more information about these airports, visit the Seattle-Tacoma International Airport (SEA) and Northeast Florida Regional Airport (UST) detail pages, or use our flight duration calculator to compare other routes.