You can travel from one region to another by using a button on the region page or by clicking the region in Maps tab.
Travel fee is not charged if the player travels from the region with a migration agreement.
Travel fee formula
Fee = (Pow (Player level), 1.4 ) * Basic Fee
Traveling from one region of the Earth to another.
Traveling from one region of the Moon to another.
Airport building affects your travel speed on Earth: you will travel up to 50% faster between regions with top Airport level. While traveling you will automatically use the fastest route, using (if necessary) one transit region to increase travel speed.
For example: you want to travel from region A (Airport 1000) to region B (Airport 50), located far away from region A. Let us assume that Airport 1000 is the highest in the game. Airport bonus in this case will not be 50%, it will only be 2.5%, because of Airport level 50 of region B: the smallest of the two is considered. But there is a region C near region B and region C has Airport with level 500. Obviously, there is a possibility of traveling from region A to region B using region C as a transfer.