Right now, January/2020 and February/2020 are the cheapest months to fly to the USA. You will pay the most in August/2020.
Austrian Airlines, JetBlue, Delta, Southwest, Alaska Airlines, United, American Airlines, Hawaiian Airlines, Allegiant Air, Delux Public Charter, Frontier, Linear Air, Silver Airways, Southern Airways, Spirit Airlines and Sun Country Air fly non-stop to the USA.
Frontier is the cheapest airline to fly to the USA.
The best airline to fly to the USA is Austrian Airlines and it has non-stop flights. JetBlue is the best budget airline.