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This has nothing to do with the VPN, unfortunately.

The price difference comes from Southwest's price being different than Delta's. Southwest flights wont show up when searching Kayak's USA site, but they do show up on international Kayak pages. It sounds like that's because they don't want to pay the brokerage fees for flights booked through the USA versions of Kayak/Expedia/Travelocity -- but I'm not sure of that.

Interesting experiment though!

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I just tried BOS-DEN nonstop 31 Jan to 7 Feb through the UK† and Canada††. Southwest came in cheapest on both searches. As has been noted, Southwest did not appear in the same search using www.kayak.com.

I was coming from a US IP. I wonder, if I had been coming from a British or Canadian IP, if I would have been redirected to the corresponding site.

†http://www.kayak.co.uk/flights/BOS-DEN/2014-01-31/2014-02-07

††http://www.ca.kayak.com/flights/BOS-DEN/2014-01-31/2014-02-0...

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