How do the surviving Asgardians get to Earth?
In Thor: Ragnarok, many Asgardians are killed; all surviving members of the race that we know of escape on a space ship. At the start of Avengers: Infinity War we see that they were almost immediately intercepted by Thanos, who slaughters many and blows up their ship. In Avengers: Endgame, it is confirmed that Thanos had slaughtered half their population (as we know had been his practice) and we see the survivors in their new settlement in Norway on Earth.
How did any of them survive the destruction of their ship? How did they get to Earth?
I found this in ScreenRant
The Russo brothers have offered a simple solution. "Prior to the start of that scene, escape ships were deployed for Asgardians," Joe Russo explained, "including Valkyrie." He refused to shed any light on the ultimate fate of Korg, but at least this comment suggested Asgardians were able to launch escape pods. It's worth noting, though, that these escape pods likely weren't in a great state of repair. After all, the Asgardian refugee ship originated from the junkyard world of Sakaar.
By the time the Guardians of the Galaxy arrive, all escape ships - and, indeed, escape pods - are clearly gone. The only sign of life they find is the body of Thor, floating through space, barely alive after facing the wrath of the Power Stone.
Pictures about "How do the surviving Asgardians get to Earth?"
How did the remaining Asgardians survive?The Russo brothers have offered a simple solution. "Prior to the start of that scene, escape ships were deployed for Asgardians," Joe Russo explained, "including Valkyrie." He refused to shed any light on the ultimate fate of Korg, but at least this comment suggested Asgardians were able to launch escape pods.
Where did the Asgardians on Earth come from?The Asgardians are a humanoid race of extradimensional beings that hail from Asgard, a small pocket-dimension adjacent to Earth. They travel around the Nine Realms including Earth via an interdimensional nexus known as the Bifrost.
How did the Asgardians survive Thanos?The survivors used escape pods before Thanos boarded the ship. The survivors were stowed on Thanos' ship while he and his henchmen slaughtered the rest.
Did Asgard survive an emergence?It's always been assumed that the disk-shaped structure is part of some advanced magic the Asgardians possess. However, a recent fan theory gives a convincing argument as to why it held its peculiar shape: Asgard survived a Celestial emergence.
More answers regarding how do the surviving Asgardians get to Earth?
If you look closely at the opening shot on Avengers: Infinity War, the aft section of the Asgardian refugee ship is briefly visible floating away (in the far right of the middle shot of the sequence below) after the superstructure had been blown into 2 pieces...
...and if one listens to the commentary by the Russo's and writers Markus and McFeely they specifically state that some of the passengers, including Valkyrie and Korg, had survived in the discarded section, a situation typical of Thanos randomly sparing (approximately?) half of the population.
"He stole the Space Stone from me when he destroyed my ship and slaughtered half my people. ..." (Thor upon first meeting the the Guardians aboard the Benetar)