Know what carriers fly from your airport to Orlando. If you go to your airport website it will list the airlines that fly from your airport. Discount carriers like Southwest, Spirit, and Allegiant don't show up on travel sites so you will want to visit the sites and price your dates. Then I usually use a travel site to compare the main carriers prices as well. Once you get an idea of what carrier is going to be the best deal for you for your date or in general if your dates aren't out yet (take into account things like no baggage fees on Southwest and that Allegiant only flies on certain days) then you can watch the fares. I just booked ours for Feb today. Southwest is generally the best deal for us. In this instance I am saving $320 total by flying into Tampa rather than Orlando and then we are flying out of Orlando on the way back because it was cheaper than Tampa. For us it's worth it because my parents winter in FL and will pick us up the day before we check-in and take us the day after we check out. Tampa is about 20-25 min. further from their house than MCO so totally worth it to save $320! But even if that wasn't the case and we had to rent a car or do something else, I'm sure we would have still saved enough to fly into Tampa. I had been really annoyed at the flight going down being $50 pp more expensive than the return flight and then found the Tampa fare which was $80 pp cheaper than the flight going down to MCO. Sanford is nearby as well, that's where Allegiant flies into and we've done that before as well.