For the 1st round-the-world trip, I have listed all the transportation costs between cities/countries of the 21 countries here.
For this 2nd round, I will do the same thing. I hope that it will help you to organize our trip and/or estimate your transportation budget as accurately as possible.

You will see below some actual costs

The estimated cost is 6000€/person to cross 29 countries, at a cruising pace (1 month/country minimum, and little travel within each country because we have to work instead of being unemployed as before).

Here is the final list of countriesUpdate
: March 2020

Poland – Czech Republic – Austria (short stay) – Hungary – Romania – France – Spain – Thailand (short stay) – Cambodia – Thailand – Laos (short stay) – Vietnam – Japan – South Korea – China (short stay) – France – Italy – Belarus (short stay) – Turkey – Egypt (short stay) – Morocco – Portugal – France – Iceland (short stay) – Canada – United States – Colombia – Panama (short stay) – Nicaragua – El Salvador – Guatemala (short stay) – El Salvador – Mexico – United States (stopover) – France

The nomenclature

City of departure (Country) -> City of arrival (Country) – Mode of transportation – Price in €/USD (if paid in €/USD) or mention “round-the-world ticket – Price in local currency (only if paid in local currency)

The rates given are for 1 person (adult)

Estimated rates are clearly indicated

Cost per trip