between Seattle, Washington and Keflavík, Iceland that I’ll be flying today, visualized in the graphics below. Remember, geologists always get window seats!
The straight-line air route appears to follow an arc of a circle when visualized on a Mercator projection of the globe.
The air route from SEA to KEF is 3,622 miles (5,830 km) and takes about 7.5 hours flight time.