Which air company to use when flying from Seattle to London?

Which air companies fly from Seattle to London? I would be flying from Tacoma International airport in Seattle (US). Does anyone know what are the best deals for aerplane tickets and is it for a non-stop flight? Is 1-stop or 2-stop flight cheaper and how convenient is that? Which company should I choose?

Air India! I know it sounds a bit akward, but they do give the most cheap ticket! I say cheap, cause ticket from Seattle to London is not less than 700,800eu (thats like 900-1000 dollars, Im not sure what currency exchange rate they use). That would be for non-stop flight, roundtrip ticket. You can also go by US Airways (I think they have tickets for 1100eu). I strongly recommend non-stop flight.