Below are the resources I am using for my cycling adventures:
Skyscanner. Skyscanner is my go-to website for flight comparison.
Warmshowers. A website for touring cyclists. It is similar to coachsurfing; but only from cyclists for cyclists. I have used Warmshowers in Switzerland, Hawaii, Australia and New Zealand and had always great experiences.
Booking. Especially on ultra-light-I-have-no-idea-where-I-will-end-up-tonight bike-packing tours, booking.com is the accommodation tool I use most. It is quick, I can filter as I wish and shows great deals.