The flight distance from Seattle-Tacoma International Airport (SEA) in Seattle, United States to St Louis Lambert International Airport (STL) in St Louis, United States is 2,744 kilometers (1,705 miles / 1,482 nautical miles). The estimated flight time for this route is approximately 4h, flying east at a heading of 99°.

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 2-hour time difference between the two cities.

Time zone information: When it's 23:08 in Seattle, it's 01:08 in St Louis.

The return flight from St Louis (STL) to Seattle (SEA) follows a heading of 301° (west 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 St Louis Lambert International Airport (STL) detail pages, or use our flight duration calculator to compare other routes.