SpaceX's first Starship V3 vehicle is fueled during a trial for the Flight 12 test flight, which is scheduled for May 21, 2026.

(Image credit: SpaceX)

SpaceX will attempt to launch its biggest and most powerful Starship megarocket ever on Thursday (May 21), and if you're hoping to watch the launch live, we have the details you need to make sure you don't miss it.Called Flight 12, the Starship mission will lift off from SpaceX's Starbase test site in the relatively new city of Starbase in South Texas. Liftoff is scheduled for Thursday (May 21) during a 90-minute window that opens at 6:30 p.m. EDT (2230 GMT; 5:30 p.m. local time).What time is SpaceX's Starship Flight 12 launch?SpaceX is currently targeting Thursday (May 21), for the launch of its Starship Flight 12 test flight, with liftoff scheduled for no earlier than 6:30 p.m. EDT (2230 GMT).SpaceX is expected to have a 90-minute launch window for the flight, so Starship could fly any time between 6:30 p.m. and 8 p.m. EDT (2230 to 0000 May 22 GMT).We are awaiting updates from SpaceX for possible backup launch dates for the test flight, but the launch date has already changed a bit. SpaceX originally announced a launch target of Tuesday, May 19, but pushed it back two days before the potential liftoff. A reason was not made public, but the need for final testing and closeout work is likely.Related: Read our SpaceX Starship and Super Heavy guide for a detailed lookCan I watch SpaceX's Starship Flight 12 launch?Yes, you'll be able to watch the SpaceX's Starship V3 launch online, but you do have several options to pick from.First, there's SpaceX (of course), which will provide live views of the launch — and likely tantalizing views from Starship itself — during a livestream that will begin 45 minutes before liftoff. So, starting at about 5:45 p.m. EDT (2145 GMT), you'll be able to watch SpaceX's Starship livestream on the Flight 12 mission page, as well as SpaceX's X account and the X TV app.Space.com will simulcast the SpaceX Flight 12 launch webcast on this page, as well as an our homepage and YouTube channel.If you want to tune in a bit earlier to the Starship Flight 12 countdown, you can follow NASASpaceflight's webcast on YouTube. This stream will begin at about 3:30 p.m. EDT (1930 GMT). NASASpaceflight has cameras all around the Starbase facility, and it will give live commentary during preflight activities, often including early looks at the Starship and Super Heavy vehicles before launch.