|Quoting Pnwtraveler (Reply 1):|
The best way is via bus. The time needed varies widely between which airport you are talking about and how bad traffic is that day. I would allow a minimum of two hours although on the worst of days that may not be enough. La Guardia to Kennedy is the easiest and quickest. The bus is less than $20 and is the least prone to delays because no tunnel or bridge into or out of Manhattan is involved.
|Quoting AAJFKSJUBKLYN (Reply 2):|
If no traffic, you can go from LGA to JFK in 15 min. Taxi would be 10-12 dollars.