Will Byler and Bailee Ackerman Byler were both students at Sam Houston State University. Their deaths were first reported by the student newspaper.
The crash occurred near Uvalde, about 85 miles (135km) west of San Antonio.
On social media, wedding attendees have been posting their condolences in the captions of wedding photos.
"I'm absolutely devastated!" wrote one friend on Facebook, adding that the pilot of the aircraft was also killed.
Another friend wrote on Instagram: "I have peace in the fact that you left this earth so full of happiness and love. How awesome to spend your honeymoon with Jesus.
"So thankful we got to spend these last few days with y'all. Our hearts hurt now, but we know this is not forever."
According to university newspaper the Houstonian, Will Byler had been studying agricultural engineering, and Bailee Ackerman Byler was studying agricultural communication.
Both were in their final year at university.