A Lufthansa Boeing 787-9 bound for San Jose, Costa Rica, declared an emergency on Thursday afternoon and turned back towards Frankfurt. The reason for the emergency remains unclear, and Lufthansa has not yet commented on the incident.
Flight LH518 departed Frankfurt at 13:58 local time, according to AirNav Radar. The service normally takes around 11 hours to cover the 9,355 kilometres to Juan Santamaría International Airport in San Jose. On this occasion, the 787 headed west over the English Channel towards the Atlantic. However, southwest of Cornwall, the crew turned the jet around and set course back to Germany.
Consequently, AirNav Radar now lists the San Jose service as diverted to Frankfurt. At the time of writing, the 787 remained airborne and was due back shortly before 17:45 local time. That would bring the total flight time to almost four hours.
Crews usually signal a general emergency by setting squawk 7700 on the transponder. The code alerts air traffic control instantly and secures priority handling. Yet it reveals nothing about the cause, which can range from a technical fault to a medical issue on board. Readers can follow similar events on our Squawk 7700 hub.
The Aircraft Operating the San Jose Flight
Planespotters identifies the aircraft as D-ABPI, a Boeing 787-9 from the Charleston production line. Lufthansa took delivery in March 2026, and the Dreamliner then entered service on 3 April. In addition, it seats 287 passengers, with 28 in Business, 28 in Premium Economy and 231 in Economy.
At first, the jet carried the name Berlin. Lufthansa renamed it Lübeck in March 2026, shortly before ferrying it to Frankfurt on 16 and 17 March. Planespotters lists the airframe at just 1.1 years old.
A New Era on the San Jose Route
The emergency comes just weeks after the 787 took over the route. Lufthansa swapped its Airbus A340-300 for the 787-9 at the start of the winter season, Aviacionline reports. At the same time, the airline increased the service from three to five weekly flights. Notably, it remains the only nonstop link between Germany and Costa Rica.
The Dreamliner also brought the Allegris cabin to Costa Rica for the first time. As a result, San Jose became the third Latin American destination for Allegris, alongside Bogotá and Rio de Janeiro.
Meanwhile, a bigger change lies ahead for the route. Lufthansa announced in October that Discover Airlines will take over the Frankfurt to San Jose service on 14 December 2027. Discover will then fly six weekly services with the Airbus A350-900.
What Happens Next
Engineers will likely inspect D-ABPI once it lands back in Frankfurt. Until then, passengers face a lengthy delay before they finally reach San Jose. Lufthansa has not yet confirmed whether it will operate a replacement flight. The airline next operates LH518 on Friday, with a scheduled departure from Frankfurt at 14:00. We will update this article as more details emerge.
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