Skyticket generally has better coverage of budget carriers in Japan. For instance they show prices for Spring Airlines Japan which neither Google Flights nor Skyscanner does.
This seems to be the case in South Korea to some extent. They seem to cover all the Korean budget airlines in flights to South Korea (from Japan and other countries) but on the example route in the direction Seoul to Tokyo they were missing the budget airlines. The prices Skyticket shows also seem to correspond to the airlines’ sites in contrast to Kayak where the prices seem to be marked up.
It might not have all of them but I have checked it has Eastar Jet and Korean Air:
P.S. Plus it can combine them (with transfers for a cheaper flight) whichever way it likes.
I believe Kayak and Skyscanner should provide you what you are looking for, don’t they?
It not, then you might want to try the airlines’ websites directly.
Credit:stackoverflow.com‘
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