I watch this film several times when I was a kid but now I can only remember a few details.
I know it was about some cowboys who travel into the future. I think it happens because the thunder hits their house or something near them. Then next thing they are in the future (our time). One of the first things they see is a plane in the sky. I can't quite remember what happens after that. I think at the end they go back to their own time (again with the thunder), or at least try, but there's some conflict, maybe one of them decides to stay behind or something. I know it's very vague, any idea what it could be?