I'm finding it ever more frustrating recently to compare and find the truly cheapest flights.
Flight search engines are more and more useless as airlines game the system increasingly to list low prices when you'll actually have to pay much more, especially with checked luggage.
Often the full amount of fees and taxes will not be shown until personal information and even credit card details have been entered. You can hunt each airline's sites for their luggage fees but they can be hard to find and easy to misinterpret.
For my current situation looking to fly from South Korea to a cheap destination in Southeast Asia, the full price often turns out to be double the advertised price!
I'm well into my trip so ditching my backpack is not an option. I'm looking for tips from experienced air travellers on how to select a flight when a huge proportion of the price seems to be hidden and obfuscated and seemingly unknowable in advance.