The pair landed in Vancouver on Monday -- where the CW superhero show shoots -- and were spotted out together, smiling and talking while walking their dogs in the chilly Canadian weather.
This is Benoist's first go at a relationship following her divorce from fellow Glee alum Blake Jenner late last year.
ET's cameras were behind the scenes for the Supergirl and The Flash musical crossover in February, where Benoist and Wood seemed very comfortable with one another. At the time, Benoist confessed that their budding on-screen relationship was one of her personal highlights from season two.
EXCLUSIVE: 'The Flash' & 'Supergirl' Musical Crossover: Behind-the-Scenes of Kara & Barry's Tap Dancing Duet!
"I mean, what I've loved about it the most is that Kara this season has totally been coming into her own and learning how to be a woman," the 28-year-old actress shared. "Last season, she learned how to be Supergirl.Read more at Entertainment Tonight