In space, no one can hear you scream . . . about travel delays.

Two American astronauts have been stuck for two months the International Space Station, on what was supposed to be a nine-day round trip.

Butch Wilmore and Suni Williams set off June 5 in the Starliner, a Boeing-built spacecraft that set NASA back a cool $4.2 billion, expecting to return home June 14.

But a series of malfunctions, including five failed thrusters and helium leaks throughout the craft, made their landing on the ISS rocky — then NASA and Boeing spent the next 60-plus days troubleshooting to figure out if Starliner can be trusted to bring the astronauts home.

Now, it looks like they could be stranded up there until next year, as NASA floats the idea of the pair returning with the crew of SpaceX’s Crew Dragon, which is due to head up to the ISS in September and return in February.

The good news: The ISS is well-stocked, and the astronauts are as comfortable as two people can be while marooned in space.

The not-so-good news: NASA and Boeing massively flubbed this mission from the start.

Leading up to the launch, Starliner was showing major signals of trouble.

Its first manned take-off was already years behind schedule, thanks to repeated design flaws; then NASA and Boeing spotted a helium leak onboard before the June 5 launch, but deemed it too small of a problem to justify scrubbing the mission yet again.

Safe to say, that was the wrong call.

It’s another black eye for Boeing, after a year of headlines about doors and wheels flying off its jets in mid-air.

But NASA looks worse: It seems to be falling back into the bungling ways that led to two space-shuttle disasters.

Also offensive is how NASA and Boeing both swear up and down that the astronauts aren’t “stuck” and could return to Earth on the Starliner if they absolutely had to.

This is blatant butt-covering baloney, meant to take the heat off of the decision-makers who put Williams and Wilmore in a nightmarish position.

The NASA is even floating the possibility of a SpaceX rescue shows it has major doubts about the Starliner’s ability to get its people home in one piece.

Boeing, meanwhile, having already hemorrhaged $1.6 billion in cost overruns on the Starliner fiasco, plainly dreads being upstaged by its SpaceX competitor.

We’re eager cheerleaders for the space program and the growing role of the private sector in it, but this is a blaring alarm — and not just of engineering failure.

NASA management needs to answer for this: Something needs fixing if it’s still trusting Boeing to build the equipment to send humans to Mars.

Congress can certainly ask questions, but the space agency’s entire decision-making process likely needs a review by rocket scientists and the very best management experts.

Humanity’s future in space is far too important to leave to this gang that can’t shoot rockets straight.