JetSetAuthority

Route · North Atlantic

BOS Boston ⇄ KEF Reykjavík

Boston Logan International Airport (United States) and Keflavik International Airport (Iceland): great-circle distance, estimated scheduled flight time each way, time difference and jet lag.

Distance3,875 km2,408 mi2,092 nautical miles
BOS → KEF5 h 15 minestimated block time
KEF → BOS5 h 40 minestimated block time
Clock change+4 hReykjavík vs Boston, today
Great-circle route from Boston (BOS) to Reykjavík (KEF)BOSBostonKEFReykjavík
The shortest path over the Earth’s surface (great circle), drawn on a Natural Earth projection. Real flight paths bend around weather, winds and closed airspace.

Flight time each way

BOS → KEF

5 h 15 min

Estimated gate-to-gate scheduled time. Initial heading 35° (NE).

Leave Boston Sat 7 Nov, 10:00 local → arrive Reykjavík Sat 7 Nov, 20:15 local.

KEF → BOS

5 h 40 min

Estimated gate-to-gate scheduled time. Initial heading 255° (WSW).

Leave Reykjavík Sat 7 Nov, 10:00 local → arrive Boston Sat 7 Nov, 10:40 local.

BOS-bound flights are the slower direction by about 30 minutes in our estimate: the route runs partly east–west through latitudes where the prevailing westerly winds at cruise height are strong, so heading east rides a tailwind and heading west fights a headwind. How we estimate it.

Distance

Great-circle distance3,875 km · 2,408 mi · 2,092 nmi
Initial heading35° (NE) from BOS; 255° (WSW) from KEF
Farthest from the equator64.0°N
Crossesneither the equator nor the 180th meridian
Share of the longest possible trip19% of the 20,015 km to the far side of the Earth

Time zones and jet lag

BOSAmerica/New_York — UTC−4 now; UTC−5 standard time, UTC−4 during daylight saving time
KEFAtlantic/Reykjavik — UTC+0 now; UTC+0 all year (no daylight saving time)
DifferenceReykjavík is 4 hours ahead of Boston today; +5 h in January and +4 h in July because daylight saving time starts and ends on different dates (or not at all).

Jet lag, flying BOS → KEF. Your body clock has to move 4 hours earlier, like an eastward trip. A common rule of thumb is that the body clock adjusts by roughly one time zone a day, so expect up to about 4 days to fully adjust. Shifting earlier (as here) is usually the harder direction; morning daylight at the destination helps. Flying the other way, the shift is reversed.

General information, not medical advice.

The two airports

BOS Boston Logan International AirportBoston, United States · longest runway 10,083 ft3,073 m KEF Keflavik International AirportReykjavík, Iceland · longest runway 10,056 ft3,065 m

More routes from BOS and KEF

LGABOS New York – Boston 296 km184 mi · 1 h 20 min BOSDCA Boston – Washington 641 km398 mi · 1 h 50 min ATLBOS Atlanta – Boston 1,521 km945 mi · 2 h 40 min LAXBOS Los Angeles – Boston 4,193 km2,605 mi · 5 h 20 min BOSDUB Boston – Dublin 4,804 km2,985 mi · 6 h 05 min BOSCDG Boston – Paris 5,535 km3,439 mi · 6 h 50 min LHRKEF London – Reykjavík 1,895 km1,178 mi · 3 h 20 min KEFCPH Reykjavík – Copenhagen 2,144 km1,332 mi · 3 h 25 min JFKKEF New York – Reykjavík 4,163 km2,587 mi · 5 h 30 min SEAKEF Seattle – Reykjavík 5,811 km3,611 mi · 7 h 25 min

Routes of a similar length

SFOIAD San Francisco – Washington 3,883 km2,413 mi · 5 h JFKSEA New York – Seattle 3,887 km2,415 mi · 5 h 55 min SFOHNL San Francisco – Honolulu 3,857 km2,397 mi · 5 h 50 min PERSIN Perth – Singapore 3,911 km2,430 mi · 5 h 35 min

Need a different pair? The flight-time calculator works for any two of 3,245 airports. Not covered: which airlines fly this route, schedules, fares and live status — that data is proprietary and we don’t guess it.

Photos on airport pages are credited there. Estimates are rounded to 5 minutes; typical error about 13 minutes (validation).