They would prefer to go to the stadium regardless weather than watching the game on television. Correct the sentence for 'regardless weather than watching the game on television'?

Regardless of the weather than watching the game on television

Regardless of the weather then to watching the game on television

Regardless of the weather than watched the game on television

None of these

They would prefer to go to the stadium regardless of the weather than watching the game on television.

"Regardless of the weather" is the correct phrase (requires "of").

"Than watching" is grammatically correct for comparison (preferring stadium over TV).