How do you get to bayswater station using the tube from heathrow airport?

Yes! Not one, not two, but three! Yes, there is three. Their names are: Heathrow Terminals 1,2,3, Heathrow Terminal 4, and Heathrow Terminal 5.

The easiest way to get to Paddington from Heathrow is using the train - it's an express one & take 15 mins. I think it costs about 15 pounds. You can get there by tube but it'll take you a lot...

There is a tube station at Euston but you will have to change to the Piccadilly line to get to Heathrow.

Take the Gatwick Express (overground) to London Victoria Rail Station. Transfer to Victoria underground station (same building) and take the Victoria Line north to Oxford Circus tube station....

There isn't a direct one. As you are travelling between airports, I assume you've got baggage and will want to avoid long esculators and stairs. I recommend you take the London Underground Piccadilly...