Currently available on 3 streaming services.

Justice League: War - watch online: stream, buy or rent

You can buy "Justice League: War" on Apple TV, Amazon Video, Microsoft Store as download or rent it on Apple TV, Microsoft Store, Amazon Video online.

Cast

Michelle Monaghan
Diana Prince / Wonder Woman (voice)
Alan Tudyk
Clark Kent / Superman (voice)
Sean Astin
Shazam (voice)
Shemar Moore
Victor Stone / Cyborg (voice)
Christopher Gorham
Barry Allen / The Flash (voice)
Justin Kirk
Hal Jordan / Green Lantern (voice)
Jason O'Mara
Bruce Wayne / Batman (voice)
George Newbern
Steve Trevor (voice)
Zach Callison
Billy Batson (voice)
Bruce Thomas
Desaad (voice)
Rocky Carroll
Silas Stone (voice)
Georgie Kidder
Freddy Freeman / Max / Additional Voices (voice)
Hynden Walch
Hannah Grace (voice)
Dee Bradley Baker
Parademons (voice)
Ioan Gruffudd
Thomas Morrow (voice)
Melique Berger
Sarah Charles (voice)
Richard McGonagle
President (voice)
Kimberly Brooks
Darla (voice)
John Mariano
Ice Cream Vendor (voice)
Roger Rose
Pinstriped Loudmouth (voice)
Matthew Mercer
Guard (voice)
Andrea Romano
Green Lantern's Ring (voice)
Gary Anthony Sturgis
Teammate #2 (voice)
Steve Blum
Darkseid / Ocean Master (voice)