Origin does have regular sales, though the amount saved will vary, especially if something is newer or not.
That said, I can guarantee there will be a summer sale roughly around the time Steam tends to have theirs. So I would be expecting one in about 2-3 months.
There is also a large sale around Christmas. So at least every 6 months for sure.
They will also hold many smaller sales between these times. The savings can still be good, but it will be variable when it shows up. I try to post stuff when there is a sale, but sometimes I miss something.