Should I wait until next Tuesday or book an international flight now?
 

If I'm looking for flights from SFO to Bangkok and returning from Hanoi in December and was wondering if there's any difference between me booking the cheapest flight today via kayak or google flights or waiting until Tuesday to check again?

Flight prices can change anytime depending on circumstances and it's more of a guessing game than a black art.

I have a good idea of what prices are on routes that I want to fly, so when I see a price that I consider to be good, I pounce as I've seen too many prices disappear before deciding to pull the trigger.