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I really like an app called Hopper. You set when and where you want to travel and it'll give you predictions about when the ticket prices are (probably) going to be at their lowest. It notifies you when the prices won't get any lower too. Airlines price their tickets pretty predictably -- it's been very accurate for me so far.
Alaska Airlines offered us 6% off 50 flights (min 15?)
Delta said they could offer a 4% discount... if we booked all the flights at one time using 1 form of payment (who has $18k in cash for flight money right away?)
Hopper.com (or the iPhone app | Andriod app is AMAZING. I've saved THOUSANDS of dollars this year because of that app. You can get flight pricing predictions, watch flights so you get notified when it's cheapest... and so much more. I saved so much money I wrong them a love letter email telling them to keep up the good work.
Una vez elegido el destino, Hopper es una app genial para encontrar vuelos tirados de precio ��
There is a predictive app called "Hopper" (only predicts in and out of same city) for Apple and Android. Also studies have shown it's best to book a flight 54 days out.
have you tried Hopper? [link]