You can fly directly to Lublin (http://www.airport.lublin.pl) by using Wizz Air (https://wizzair.com), Ryanair (https://www.ryanair.com) and Small Planet Airlines (https://www.smallplanet.aero/pl).
If you fly to Warsaw you can take a train (http://pkp.pl/) or a bus (https://www.contbus.pl/) to connect to Lublin.