SpaceX pushes Starship Flight 12 to Thursday evening liftoff

SpaceX has delayed the long‑awaited Starship Flight 12 by one day, moving the debut of its upgraded V3 megarocket to Thursday evening from the company’s Starbase site in south Texas.

New target: Thursday, May 21 evening launch window

Published launch schedules and specialist tracking sites indicate that SpaceX is now targeting Thursday, May 21, 2026, for the Starship Flight 12 test. The updated plan follows a sequence of tentative dates that initially pointed to a Tuesday liftoff, before slipping to Wednesday and then to Thursday as preparations continued at Starbase.

Across multiple launch-tracking outlets, Flight 12 is listed with an evening liftoff time from Starbase. Publicly available timelines point to a target of no earlier than 6:30 p.m. local time in south Texas, corresponding to 5:30 p.m. Mountain time, 7:30 p.m. Eastern time and 23:30 UTC. The exact start and end of the launch window can still shift as final checks proceed.

Specialist launch calendars that aggregate regulatory filings and SpaceX updates show a nominal window that extends for more than an hour after the opening time. Independent tracking pages highlight a reference liftoff time of about 22:30 UTC for planning purposes, although they note that SpaceX frequently refines timing closer to the event.

As with previous Starship tests, webcast coverage from space news outlets is expected to begin roughly 30 to 45 minutes before the target liftoff. Viewers planning to watch live are being advised to treat the published liftoff time as “no earlier than” rather than a fixed appointment.

Why Flight 12 slipped a day

The latest shift in the schedule reflects the highly iterative nature of the Starship test campaign. Public coverage tracing regulatory advisories, road closure notices and pad activity shows that SpaceX initially circled Tuesday, May 19, for the debut of the Starship V3 configuration. As work continued, that target moved first to Wednesday, May 20, and then to Thursday, May 21.

Reports indicate that the one day delay is tied to additional preparation and verification steps for the new V3 hardware, rather than a single dramatic issue. The company is introducing a redesigned version of both the Super Heavy booster and the Starship upper stage, along with the next evolution of the methane-fueled Raptor engine family and a newly configured launch pad at Starbase.

Observers following activity at the site note that the fully stacked rocket has undergone a familiar sequence of tests in the days leading up to the revised launch date. These include cryogenic propellant loading trials and pad systems checks that are typically completed before a first flight of a new vehicle version. Such rehearsals often drive last minute schedule changes as teams gather data and adjust procedures.

Commercial space analysts point out that single day slips are common for complex test flights, particularly when new hardware and infrastructure are involved. In this case, the move to Thursday keeps Flight 12 in what many in the sector still describe as a near term window, suggesting that the overall campaign remains on track despite the adjustment.

What to expect from the Starship V3 test

Flight 12 will mark the twelfth integrated test of Starship and Super Heavy, but it is the first outing for the V3 iteration of the system. Public technical briefings and mission previews describe V3 as a significant step in SpaceX’s plan to make Starship a fully and rapidly reusable heavy lift vehicle capable of carrying large payloads and crews to Earth orbit, the Moon and eventually Mars.

The upgraded booster and upper stage feature structural, thermal and propulsion changes designed to improve performance and reuse potential. The mission profile published by space news outlets indicates that the two stage vehicle will follow a suborbital trajectory, with the Starship upper stage expected to splash down in the Indian Ocean off Western Australia roughly an hour after launch, assuming the flight progresses as planned.

For this test, the upper stage is expected to deploy multiple inert payloads that mimic the size and mass of next generation satellites. Analysts note that these dummy payloads are intended to validate deployment mechanisms and on board systems without risking operational spacecraft.

The test will also exercise new avionics, thermal protection refinements and pad interfaces. In earlier documentation, SpaceX has emphasized that each flight in the Starship series is designed as a data gathering opportunity, with success defined as much by what engineers learn as by how closely the vehicle adheres to its intended trajectory.

How to follow the revised launch timeline

With the schedule now pointing to Thursday evening, those planning to watch the flight are being encouraged to monitor launch day updates closely. Space focused media outlets and independent trackers typically post real time adjustments to the countdown, including holds, minor slips within the window and any scrub decisions.

Coverage plans published ahead of Flight 12 suggest that live commentary will begin about half an hour before the opening of the launch window. That would place the start of many streams around 6:00 p.m. local time in south Texas, ahead of the earliest targeted 6:30 p.m. liftoff.

Travelers heading to the Boca Chica and South Padre Island areas to view the launch are watching for local road closure information and safety advisories, which are commonly updated in parallel with changes to the countdown. Previous Starship tests have attracted crowds to public beaches and viewing points across the region, particularly for evening launch attempts when weather cooperates.

For those following from afar, the key detail for now is that Starship Flight 12 remains a moving target, but with a clearly signposted aim: a Thursday, May 21 evening liftoff, no earlier than 6:30 p.m. local time, as the world’s most powerful rocket attempts its next giant step from the Texas coast.