Most cheap flights from the United States to London are into London Heathrow Airport (LHR). This busy airport is located in West London, and is served by the major U.S. and European airlines. The cheapest way to get into Central London from London Heathrow is by the London Underground, which will get you to most anywhere in the city for around $10-$15, and it takes around an hour depending on your final destination. There are also other train and bus options available from Heathrow.
London Gatwick (LGW), London Stansted (STN), London City (LCY) and London Luton (LTN) make up the other 5 international airports serving London. Though these airports have limited nonstop service to the United States, you might find London flight deals into these other airports if you don't mind making a connection in another European Airport. These airports are not directly connected to the London Underground, but do have bus and rail options available into Central London.
Looking for the best possible deal, search for airport code LON, and we will find prices for all airports in London for your dates and origin.
Sample round-trip and one-way fares posted on www.statravel.com are per person and include all applicable taxes and fees including, but not limited to:
September 11th Security Fee of up to $5.00 for each flight segment originating at a U.S. airport; Passenger Facility Charges of up to $18, depending on itinerary; Federal Segment Fees of $3.70 per segment; and foreign and U.S. Government-imposed charges of up to $400 per international round-trip flight, depending on routing and destination. A flight segment is defined as one takeoff and one landing. Fares are subject to availability and change without notice. If advertised fare is not available for dates chosen, higher fares may be offered. Actual prices may vary based on actual routing, fluctuations in currency (international only), and day of week. Student/Youth/Teacher Exclusive Fares require a valid ID Card. Additional airline imposed fees for optional services including baggage, seat assignments, meals and other products may apply and are payable at check-in.