I flew FlyBondi on a domestic Argentine route and gave a mini comparison on a different thread what I thought of FlyBondi, JetSmart and Aerolineas Argentinas (all domestic routes). If you do a search you should be able to find my post.

All three airlines were on time for me, although I have a slight preference for AR going forward, personally. AR has a better set up and they do not nickel and dime you the way FlyBondi and JetSmart do.

If I were you I would look up the flight you are eyeing on flightaware.com and see the past flight history of the specific flight yourself.