As hopes for reopening the United States for tourism again rise, a nice price has come up with Norwegian airlines. You can now purchase a direct flight from London Heathrow to Miami from £284.
The flight there takes 10 hours and 8 hours on return. The cheapest fare does include only an underseat 10kg bag allowance (30×20×38 cm). £9 for overhead cabin bag and £50 for 1 checked baggage are optionable.