The flight distance from Seattle-Tacoma International Airport (SEA) in Seattle, United States to Alert Airport (YLT) in Alert, Canada is 4,364 kilometers (2,712 miles / 2,357 nautical miles). The estimated flight time for this route is approximately 6h, flying north at a heading of 10°.

This is a long-haul route typically operated by wide-body aircraft such as the Boeing 777 or Airbus A350. Full meal service, in-flight entertainment, and comfort amenities are standard.

This is an international route connecting United States with Canada. Travelers should check visa requirements, customs regulations, and any travel advisories before booking.

Time zone information: When it's 22:01 in Seattle, it's 01:01 in Alert. The 3-hour time difference may cause some jet lag. Most travelers adjust within a day or two.

The return flight from Alert (YLT) to Seattle (SEA) follows a heading of 248° (west southwest). 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 Alert Airport (YLT) detail pages, or use our flight duration calculator to compare other routes.