My sister just moved to a suburb outside Cleveland, and my mother and I would like to visit her a few times per year. However, gas prices have gotten so high that it seems impossible (not to mention the nearly 6 hour drive). I'm always hearing people say that they get flights to Chicago, New York, and other big cities for $70 to $100, but when I checked on a flight to cleveland it was $336! I tried priceline, but they rejected every offer I made. Any tips for cheap flights?