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I always tell people that there’s not one website out there that has all the cheapest flights, and that’s why you need to check them all often, sign up to their newsletters, and follow them on Twitter and Facebook. Another site for flight deals to add to your long list is fly4free.com, which does a good job posting deals for flights to and from Europe, Asia, and Australia.
For example, they just featured this:
deal on flights from San Francisco to Europe for $390 R/T on United.
