Quote Originally Posted by Sapphire Guard View Post
Starkiller destroys earth from halfway across the galaxy. The End.

Otherwise, it would be something like TFA, where the Avengers infiltrate before it fires.
The heroes in TFA had a former stormtrooper stationed on the base, though, so they knew where it was. Avengers would no more be able to find Starkiller Base than the Empire was able to find the Rebel base beside planting a tracker on the Falcon.