Akiestar From Philippines, joined May 2009, 747 posts, RR: 0 Reply 1, posted (1 year 4 months 2 weeks 23 hours ago) and read 2931 times:
It depends on where you're going. LO has more flights, but O2 is often cheaper, since it's an LCC. Regardless of the carrier, you could either end up on a jet (usually a 737 or an E-series for LOT, an A320 for OLT), or on a prop (ATR-42 or 72 for both).
Also, I should inform you that out of Warsaw, Bydgoszcz, Katowice and Kraków are served exclusively by LOT, while Łódź will be served exclusively by OLT (starting October 29).
Haven't flown domestically around Poland (trains are much cheaper), but K2 (euroLOT) is all right, and mainline LO is pretty good in international. I've wanted to try O2, but never got to doing it.
KRK-WAW is doable on LO and K2 (LO operated by K2). There are a number of flights between Warsaw and Kraków. However, the train can be just as competitive as the plane (the fastest is 2.5 hours) and much more convenient, unless you're flying KRK-WAW-AMS on the same day.