The best and cheapest way to get to kyiv is with Wizz Air, Ryanair, Skyup Airlines depending on your orgin city, or just use skyscanner.net to get the best prices with different airlines.

There are 2 airports in Kyiv that you can use:
Boryspil Airport-AIrport code (KBP)
Zhuliany Airport-Airport code (IEV)

WHEN IN KYIV

TAXI
Using the Uber or Bolt mobile taxi apps you can easily get to your hotel/accommadtions from the Kyiv airport. Its also the best way to travel to different destinations within kyiv during your stay.

METRO
Using the metro in Kyiv is quit easy and very cheap. It will cost you only €0.25 for a single fare.
You can visit many cool places in Kyiv with the metro system. Click HERE to view the metro map.