IcelandairFI100% on time
Flights FI631 17:00 daily
live
Direct flights from Reykjavík (KEF) to Boston (BOS): 7 nonstop departures observed each week across 1 airline. 100% of the last 5 tracked flights arrived within 15 minutes of schedule. The median arrival is 6 minutes early. No cancellations were recorded across the 7 tracked flights. The nonstop covers 3,874 km, an estimated 5 hours 28 minutes in the air. Measured by Pro Flight Search from live flight boards at Reykjavík and Boston. Updated 13 November 2026 at 11:52 UTC.
Today, KEF → BOS
Fri 13 Nov · local times- 17:00 FI631Icelandair On scheduleGate D21 ·
Checked KEF board 11:52 · BOS board 07:08
KEF
Reykjavík
smooth · +1
BOS
Boston
smooth · +10
3,874 km · ~5h 28m est.
Runs reliable · 1 airline · 7x weekly · nonstop
100% on time
of the last 5 tracked KEF → BOS flights arrived within 15 minutes
Median arrival delay is −6 min. 0 of 7 tracked legs cancelled in the sample. Will a delayed flight be cancelled? →
Median arrival−6 minacross the last 5 arrivals
Flight time~5h 28mestimated from route distance
Weekly departures7x1 direct airline on the leg
The week
scheduled departures · origin local time06121824
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Icelandair
Each mark is a scheduled departure at its origin-local time, observed operating in the last 7 days. Today is highlighted.
Who flies it
observed on the boards · 7 daysHistory
operated legs · board outcomesActual board outcomes rather than schedules, paired departure and arrival per flight and day.
Full board history, day by day →
Airports right now
live boardsWeather lens
Conditions are tightest at BOS: a 36% chance of a 15+ minute delay. In this weather, the more delayed of the two airports is typically about +4 min. Both figures come from the two airports' delay records in similar weather. See live delays → · Weather risk by airport →
next sweep in 120s
How the Reykjavík to Boston route actually runs
Pro Flight Search records official board updates for nonstop KEF to BOS flights through the day: schedules, estimates, gate pushes and actual departures. The verdict above comes from operated flights, so it reflects what this route does rather than what the timetable promises.
Planning around a delay? Live airport delays · Weather delay risk map · Will a delayed flight be cancelled? · Do planes make up time in the air? · How we measure
Cite this data
Journalists, bloggers, and researchers may cite this page with attribution and a link to Pro Flight Search.
Suggested citation
Pro Flight Search: Reykjavík (KEF) to Boston (BOS) route reliability, measured from operated flights on official airport boards.
Canonical URL
How we measure this →
https://proflightsearch.com/search-flights/KEF-BOS
KEF to BOS questions
Is KEF–BOS running on time right now?
Smooth skies ahead. The arrival side at BOS is the weaker end, route health score 82/100. The airports section above carries the live status and delay window at both ends.
How long is the flight from KEF to BOS?
Great-circle distance is 3,874 km. With typical jet cruise speed plus taxi, climb and descent, expect roughly 303–362 min gate-to-gate on this route.
How often does KEF–BOS fly?
Icelandair runs the route with about 7 flights a week (daily). Since one carrier owns the route, a single disruption tends to ripple through the day.
What does the route health score measure?
A blend of departure-side delay at KEF and arrival-side delay at BOS, computed from rolling delay windows (refreshed every 40 minutes) with a daily-rollup fallback. Current MVFR, IFR, or LIFR endpoint weather caps the score when flight rules can limit throughput. Higher is healthier: 100 means operations are clean at both ends.
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