Smokinya Foundation encourages green travel and below you can search both flights, but also train and bus options.
We ourselves often use Kiwi.com, and should you book using the easy search below, Smokinya Foundation could be supported by Kiwi.com with 3% of the final price. That is up to your choice, there’s no price increase for you as a customer. Feel free to also check out other search engines.
We often check flight options here
https://www.google.com/flights
http://www.azair.com/
https://www.edreams.net/cheap-flights/