I waited a little bit to long with the booking of my flight from Hanoi to Danang. So now the price for one flight ticket is around 80€. When before it was around 40/45€. 
Does somebody have any cheaper ideas of getting from Hanoi to Danang and from there to Hoi An? Thank youuuu!
Sleeping bus if you don’t mind spending 20+ hours on the road haha.
Last year, I paid less than 20usd for the bus trip.
You can actually get a 7 stop bus ticket along all the big stops (I went from Hanoi to HCMC) for around 45usd in many the hostels. When you take the night bus it’s not that bad and you dont have to get accomodation for that night either
Sleeper train be about $25 if not look at skyscanner for other options or direct with jetstar
Da nang to Hoi An is like a 40 min drive… busses go every hour.
Hanoi to da nang is far as fuck though, so sleeper bus or train would be the cheaper, but more time consuming options.