The Civil Aviation authority had said in a statement earlier that the electrical failure occurred before dawn and that technicians were working to resolve it.
No planes were allowed to take off or land in Costa Rica between 6 a.m. and when power was restored.
Costa Rica has a second international airport in Guanacaste, but aviation authorities said that the radar failure affected flights there as well.
Some airlines advised passengers of the situation on social media platforms, asking travelers to contact the airlines to reschedule their flights.
Authorities have not said how many flights were affected.
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