We are 5, so tend to only book flights on sale, and build the holiday after that. Recently, we got 5 return tickets to Singapore for $1500 (total) on Scoot, but as we'd recently been to Singapore, only had 3 days there and the rest of the time was in Malaysia (Tioman and LEGOLAND). We've done the same again, and while we only have the flights to Singapore, the plan is to go to Vietnam.