Cheapest airline flying from the UK to denver?

I want to fly from Scotland to Denver, Colorado in february next year. What is the cheapest airline to fly with?

February next year is too far ahead. Better book in November.

I generally trust Mobissimo. It is meta-search - this means that it searches the other websites for you.

http://www.mobissimo.com

Another good site is http://www.Vayama.com

Here from time to time Lessno.com publish some prices and they do not promote one and only lessno, but announce other good deals too: http://blog.lessno.com

a budget one such as jet2 and easy jet.