Ah, your LATENCY.
There is about zero you can do, this occur outside your home, on the Internet.
Oh, there is something you can do: if this occur consistently, no matter where you are pinging to (destination), you should first power down everything and cold boot and see if that resolve the prob.
If still prob, the only thing you can do is to complaint to your ISP. HEY YO, YOUR ROUTERS ARE MESSED UP! Their router are shipping your packets via the scenic route rather than the most direct. ^) This sometimes happens when part of their infrastructure is under maintenance.