The easiest way to get to Ohrid is from Skopje, so it is the best option if you plan your flight to Skopje airport. Buses from Skopje to Ohrid run every few hours, the return ticket costs around 15 EUR and it takes approximately 3 hours to get to Ohrid by bus. 

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There is also a small airport in Ohrid (Ohrid-airport) and you could check whether there is a convenient connection for you to the Ohrid airport.