Jake Livermore had given Hull the lead by finishing off a counterattack in the 28th minute, but Vydra equalised in the 86th with his first goal for the club to end a four-game losing streak in the league for the Baggies. The Czech striker is on loan from Udinese.
The 21-year-old, who spent last season on loan at second-tier Watford, is West Brom's third close-season signing