There are 5 airports serving London: London City Airport, Heathrow, Gatwick, Stansted, Luton. Some are closer than others, however the closer airports may have more expensive flights.
There are at least two public transportation options from the center of London to each airport. With so many options it’s possible to choose the transport that works best for you.
London City (LCY) www.londoncityairport.com/visitingtheairport/page/publictransport
Heathrow (LHR) www.heathrow.com/transport-and-directions
* Travel time of 15 minutes. The express train has a shorter trip, however it may be a more expensive option. Be sure to book in advance.
** Travel time between 31 and 49 minutes. Ticket to London Paddington 10.20 pounds. Only stops at terminals 2&3 or 4 with a free transfer train to terminal 5 from terminals 2&3.
***Pay as you go cost of 5.10 pounds during peak hours and 3.10 all other times.
Gatwick (LGW) www.gatwickairport.com/to-and-from/
* Travel time of 30 minutes. The express train has a shorter trip, however it is much more expensive
Stansted (STN) www.stanstedairport.com/getting-to-stansted/
*Unlike Gatwick and Heathrow, the Stansted express is the only rail option to the airport from the center of London
Tip: There are no water fountains in the terminal, but water bottles are available in return for a donation, so bring some change
Luton (LTN) www.london-luton.co.uk/to-and-from-lla
* There is a shuttle bus that takes you to the terminals from Luton Parkway train station. This is an additional cash only cost if the ticket is booked to Luton Airport Parkway (LTN). The fare for this shuttle is included in all tickets booked to Luton Airport (LUA).