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by geverett 4759 days ago
A number of sites do this to varying degrees of success:

- Skyscanner, as David says - Adioso (YC W09) - TripCommon - you can also set up alerts 'SF to Europe for less than $Y00' - Getgoing (YC S12) - Kayak explore

I've always found Skyscanner has the best results, but I'm curious to see how newcomer Getgoing compares.