LHR to KEF flight delays
626 flights · January 2025 – August 2026 · UK Civil Aviation Authority
85.09%
Arrived on time
Within 15 minutes of schedule
1.44%
Cancelled
Share of scheduled flights
—
When late, late by
Average across delayed arrivals
8 min
Delay per flight
Averaged over every flight flown
What the record says about this route
Which airline you fly changes the odds here. British Airways arrived on time 6.1 points more often than Icelandair over the same period on the same route — same airports, same weather, same air traffic control. A gap that survives all of that is about how the two airlines are run.
The season swings this route hard. In April it ran 19.1 points more punctual than in January — a difference bigger than the one between the best and worst airlines on most routes. If the date is flexible, it is worth more than the carrier.
Flights from London to Reykjavík keep to schedule more reliably than most. On a route this punctual the day you fly matters more than the airline you pick.
Which airline should you fly on this route?
Over January 2025 – August 2026, British Airways arrived on time most often on LHR to KEF. Icelandair was late most often. Flights ran closest to schedule in April and worst in January.
Every airline on LHR to KEF
Ranked by how many flights each one operated. A carrier with fewer than 100 flights in the period is listed but not graded.
| Airline | Flights | On time | Cancelled | Avg delay | Grade |
|---|---|---|---|---|---|
| Icelandair | 421 | 83.09% | 1.66% | — | B |
| British Airways | 205 | 89.16% | 0.98% | — | A |
Month by month
Share of flights that arrived within 15 minutes of schedule, by month flown.
The return leg
KEF to LHR Reykjavík back to London 84.52% on time BOther routes from London
Common questions
Are flights from London to Reykjavík usually delayed?
85.09% of flights on the LHR to KEF route arrived within 15 minutes of schedule, so roughly 1 in every ten arrived late. That is better than the average route in this record.
Which airline is most on time from London to Reykjavík?
British Airways, at 89.16% on time across 205 flights. The least punctual on the route was Icelandair at 83.09%.
How often are LHR to KEF flights cancelled?
1.44% of scheduled flights did not operate — about 14 in every thousand. That is in the normal range.
What is the best month to fly London to Reykjavík?
April, when 96.3% of flights arrived on time. The worst was January at 77.2%.
What these figures do and do not tell you
Everything on this page is counted from the flights that actually operated on LHR to KEF during January 2025 – August 2026, as reported by the airlines to the US Bureau of Transportation Statistics. "On time" is the federal definition: arriving at the gate within 15 minutes of the scheduled time.
A route's record is a description of the past, not a forecast. Weather, air traffic control and the aircraft's earlier flights that day drive most delays, and none of them are predictable from a historical rate. What the record does tell you is whether this route runs late more often than others, and which carrier on it has the better history — which is the part you can actually act on when you book.
Cancellations are counted separately from delays because they are a different problem for a traveller: a late flight still gets you there. How the grade is calculated →