Chūnin Exam Arc
After Hinata and Neji's fight during the Chunin Exams, it was shown that Sakura had been concerned for Hinata and had run down to the arena along with Naruto and Lee, to make sure that her friend had been safe.
Ten-Tails Revival Arc
Sakura and Hinata were both shown to be good teammates and work well together. When Sakura inquired about Naruto and Sasuke's whereabouts and actions, Hinata, who had seen what they had done with her Byakugan, informed Sakura.
The Last: Naruto the Movie
Hinata and Sakura are said to appear together.
Among the Fans
SakuHina is a relatively well-known pairing throughout the fandom. As both Sakura and Hinata are one of the most well-known female characters in the series, they are often compared and set against each other as 'who's better' by many of the members in the fandom. Also, as both girls have a connection to both members of the SasuNaru pairing, another reason why this pairing is shipped is because of the similar feelings that these two characters hold towards the one they have feelings for in the series. Their rival pairings are NaruSaku, NaruHina, and SasuSaku.