Skyscanner
My favorite thing about Skyscanner is that it has “everywhere” as a destination option. Perfect when you want to see where you can fly for cheap! You can also choose an entire country, i.e. fly to Italy. Skyscanner also lets you search within a full month if you have flexible dates.
Momondo
Momondo is a good backup for Skyscanner. Just make sure you click through and read all the fine print, because while they’ll occasionally find even better deals, sometimes they’ll link you to deals that don’t exist.
Kayak
Kayak used to be my favorite flight search engine, but they have removed several budget airlines from their search engine in the past year. You can still find deals on here, so I wouldn’t write them off completely
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