I just used this and the results were amazing. Ie end result was it said "we haven't seen prices this low for 6 months, you should book these dates now"
And the results that it found were half the price that hipmunk found (the hipmunk results were awful)
Wow, this is perfect if you have flexibility with travel dates. Other booking tools I've used (i.e. Kayak) have "flexible date" search criteria, but it's usually limited within a week of a selected itinerary. Sometimes you just want to go somewhere within the next few months or year.
Hustle X
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