The family of Miss Honduras has pleaded with police to find their teenage daughter, who was abducted just days before she was set to fly to London for the Miss World contest.

Maria Jose Alvarado and sister Sofia Trinidad have not been heard from since they vanished on Thursday last week outside the northern city of Santa Barbara.

All signs are that the siblings have been kidnapped.

"Days have gone by and we have not heard a thing. The police have to know something," said a tearful Teresa Munoz, their mother.

Alvarado had been set to travel to London on Wednesday for the Miss World competition.

The sisters disappeared after attending a birthday party for Sofia's boyfriend.

National police are working on several leads in the search for Alvarado, who's also part of a modelling reality show on Honduran television.

Honduras, an impoverished Central American country with eight million people, is statistically the most violent nation in the world.