I've never seen no wind. Sometimes you have to sail into the wind, but then you just have to tack, which means that you sail to one side of where you want to go for a while (likely until you are going to hit land), and then turn to sail to the other side, so you're zig-zagging to your destination. Eventually the wind will clock around so that you don't have to tack anymore.

https://en.wikipedia.org/wiki/Tacking_(sailing)