The move is designed to ease the nerves of Eastern European nations and Nato members which remain fearful of aggression from Putin's Russia.
Upon their arrival over the weekend, the US air force tweeted: "Next step for #F35 in #USAF! Great flying in UK!"
Costing more than £80 million each, F-35A jets are considered the world's most advanced warplane and can fly at more than 1,200mph.