Buendia struck with a superb volley after 62 minutes at Carrow Road to give Daniel Farke's team their a first victory in three matches.
Norwich, relegated from the top-flight last term, are four points clear of second placed Swansea.
Jamal Lowe struck twice as Swansea came from behind for a 2-1 win over sixth placed Watford at the Liberty Stadium.
Tom Cleverley gave Watford a 20th minute lead, but Lowe levelled before the break and then headed home from Korey Smith's cross midway through the second half.
Lucas Joao bagged a brace as he made an impressive return from injury in fourth placed Reading's 2-1 win at Huddersfield.
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