Book flight to Kiev, Ukraine.  

There are two international airports in Kiev:

• Kyiv Boryspil International Airport - KBP
  (aka Kiev Borispol) and
   
• Kyiv Zhuliany International Airport - IEV

Majority of international flights - especially those bound from Europe, the Americas, and Asia -  arrive at KBP.  The other Kyiv's airport Zhuliany is  mostly used for domestic flights as well as some international ones too.

Most major airlines like UIA (Ukrainian International Airlines),  Lufthansa, Air France, KLM, Delta, Polish LOT , etc. feature convenient flights from many European air hubs. Some airlines have flights to other Ukrainian cities with international airports like Kharkiv (Kharkov), Odessa (Odesa), Lviv, etc. 

We suggest that you start your search with online websites like Expedia.com and kayak.com, and Hotwire.