Transatlantic route · frequency, carriers and airport records
KEF→BOS
Reykjavík to Boston
- Flights
- 1,377 both ways
- Carriers
- 2
- Distance
- 2,407 mi
- Period
- July 2025 to June 2026
No public record scores Keflavík to Boston Logan International flight by flight. The US Department of Transportation's on-time database covers domestic flights only, and in Europe only the United Kingdom publishes punctuality by route, so what follows is built from the three measurements that do exist. The DOT's international report counts 1,377 flights between the two airports in the twelve months to June 2026, about two departures a day in each direction, flown by Icelandair and X9. EUROCONTROL's year-to-date figure has 69.0% of all departures from Keflavík leaving within 15 minutes of schedule and 77.8% of arrivals landing within 15 minutes. At the other end, 74.6% of BOS's domestic departures arrived on time in the DOT data, which says something about how the airport itself runs, not about this route.
On EUROCONTROL's year-to-date arrival punctuality, Keflavík ranks 15th of the 41 European airports on this site with service to the United States. Bilbao leads that table at 84.3% and Manchester closes it at 65.7%. A long-haul departure inherits the airport's morning: an aircraft that arrived late from its previous sector, or a departure queue built up by weather, delays the transatlantic wave with everything else.
Key figures
Flights
1,377
Both directions, July 2025 to June 2026 (DOT)
Carriers
2
Icelandair, X9
KEF departures on time
69.0%
All destinations, year to date (EUROCONTROL)
BOS domestic on time
74.6%
US DOT, last twelve months of domestic departures
Without a route-level record, the useful question is what the two airports do to a schedule. EUROCONTROL attributes 0.0 minutes of air traffic flow management delay per arriving flight to Keflavík so far this year; that is delay imposed by the network to hold traffic on the ground elsewhere, not the airline's own. In the DOT data, a delayed domestic departure from BOS ran a little over an hour late on average over the last twelve months, and 3.05% of its scheduled flights were cancelled.
Carrier by carrier
Who flies KEF to BOS
Icelandair flew 98% of the 1,377 flights between KEF and BOS in the DOT's count, with X9 on 31. Loads averaged 163 passengers a flight, which on this route means wide-body aircraft nearly full.
| Airline | Flights | Share | Per month | Passengers / flight |
|---|---|---|---|---|
| Icelandair | 1,346 | 98% | 112 | 162 |
| X9charter | 31 | 2% | 3 | 204 |
DOT international report, July 2025 to June 2026; flights in both directions together. No delay figures exist for this pair in any public source.
Across the year
How often KEF to BOS flies through the year
The DOT's international report puts 207 flights on the pair in August 2025, the busiest month of the window, and 61 in February 2026, the thinnest. A summer-to-winter swing of that size means the winter schedule is a different operation: fewer frequencies, so a cancellation leaves a longer wait for the next seat.
Flights per month, both directions
- July 2025176
- August 2025207
- September 2025153
- October 2025118
- November 202590
- December 202584
- January 202663
- February 202661
- March 202699
- April 202698
- May 2026110
- June 2026118
The DOT's international report counts flights in both directions together: 1,377 between KEF and BOS from July 2025 to June 2026, about two departures a day in each direction, carrying 225,014 passengers. That makes it the 3rd busiest of 16 US routes from Keflavík and the 7th busiest of 21 European routes into BOS.
The departure airport
How Keflavík is running
EUROCONTROL's figures for Keflavík as a whole, every airline and every destination: 69.0% of departures and 77.8% of arrivals within 15 minutes of schedule from 1 January to 21 October 2026, with 88.5% of scheduled flights operated. The last seven days ran at 70.5% for departures, 2 points better than the year so far. Air traffic flow management delay attributed to the airport averaged 0.0 minutes per arriving flight this year, 0.0 over the last week.
| Window | Departures on time | Arrivals on time | Schedules operated | ATFM delay / arrival |
|---|---|---|---|---|
| Yesterday (21 October 2026) | 79.5% | 89.6% | 91.2% | 0.0 min |
| Last 7 days | 70.5% | 78.1% | 91.6% | 0.0 min |
| Year to date | 69.0% | 77.8% | 88.5% | 0.0 min |
Every US route from Keflavík, and its full punctuality record
The arrival airport
Landing at Boston Logan International
Boston Logan International is scored on this site from the DOT's domestic data: 74.6% of its 144,174 domestic departures arrived on time over the last twelve months, with delayed flights running a little over an hour late, and 3.05% were cancelled. Those are domestic flights, not this route, but an arriving transatlantic flight shares the same runways, the same weather and the same ground delay programmes, so a bad day at BOS reaches a flight from KEF just as surely. The airport's own page has the hour-by-hour and month-by-month detail, and its live FAA status appears above when the FAA has something to say.
Domestic on time
74.6%
Arrivals under 15 minutes late (DOT)
Avg delay
73 min
Delayed domestic flights only
Cancelled
3.05%
Domestic departures
144,174
Last twelve months
Boston Logan International (BOS) delay statistics, hour by hour and month by month
Your rights
EC 261/2004 on KEF to BOS
Every flight that departs Keflavík falls under Regulation (EC) 261/2004, whichever airline flies it and wherever it lands. If it arrives at Boston Logan International three hours or more late, or is cancelled with under 14 days' notice, and the cause was within the airline's control, each passenger is owed €600 (€300 if the airline got you there under four hours late), on top of rebooking and care. Weather, air traffic control restrictions and strikes outside the airline are the usual exemptions. The return flight from BOS is covered only when the carrier is EU based. The sector is about 2,407 miles, 3,873 km, which puts it in the top distance band.
Delayed three hours or more? Check a claim with Compensair →
What to do with this
Booking KEF to BOS
There is no grade to give KEF to BOS without a route record, and this site does not invent one. What the three sources support: about two departures a day in each direction, a choice of two carriers, a departure airport that gets 69% of its departures away on time and an arrival airport that runs 75% on time domestically. Leave two hours for any onward connection at BOS; immigration comes before the connecting flight.
Common questions
KEF to BOS questions
How often are KEF to BOS flights delayed?
No public dataset records delays for this route flight by flight: the US on-time database is domestic only and only the UK publishes route-level punctuality in Europe. The nearest measurements are the departure airport's EUROCONTROL punctuality (69.0% of departures within 15 minutes this year) and BOS's domestic record in the DOT data (74.6% on time).
Which airlines fly KEF to BOS?
Icelandair and X9, in order of flights operated between July 2025 and June 2026. Icelandair accounted for 98% of the 1,377 flights the DOT counted on the pair.
Can I claim compensation for a delayed KEF to BOS flight?
Yes, if the flight arrived three hours or more late or was cancelled at short notice for a reason within the airline's control: departures from Keflavík are covered by EC 261/2004 whichever airline operates them. The fixed amount for a sector of this length is €600 a passenger, €300 if the airline got you there under four hours late. The return from BOS is covered only on an EU carrier.
How many flights a day are there from KEF to BOS?
About two departures a day in each direction: the DOT counted 1,377 flights in both directions over twelve months, peaking at 207 in August 2025 and falling to 61 in February 2026.
Related
Where to go next
- Keflavík (KEF): every US route
- Boston Logan International (BOS) delay statistics
- KEF to JFK, New York (JFK)1,713 flights
- KEF to SEA, Seattle (SEA)1,413 flights
- KEF to ORD, Chicago (ORD)1,276 flights
- KEF to IAD, Washington (IAD)1,015 flights
- LHR to BOS, from London5,370 flights
- CDG to BOS, from Paris2,530 flights
- DUB to BOS, from Dublin2,476 flights
- AMS to BOS, from Amsterdam2,230 flights
- Every Europe-to-US route and airport
Iceland publishes no route-level punctuality, so this page cannot grade the route. The UK pages in this section can, because the CAA does.
Sources: US DOT Bureau of Transportation Statistics, International Report (flights and passengers by carrier and airport pair), July 2025 to June 2026; EUROCONTROL Aviation Intelligence Portal, airport punctuality and ATFM delay to 21 October 2026. Rebuilt 22 October 2026; the EUROCONTROL figures refresh with each weekly build, the others when their publisher releases a month. How these sources differ.