Fly into Heathrow Airport (LHR), the closest airport, located 4.5 mi (7.3 km) from the city center. If you can't find a flight that works for your travel itinerary, you could book a flight to Gatwick Airport (LGW), which is 26.4 mi (42.5 km) away.
If you're traveling by train, make your way to Wraysbury Station or Slough Sunnymeads Station to see more of the city.