Please book your flight to Haneda Airport (HND) or Narita Airport (NRT).
If you search for tickets by typing “TYO” this should cover both airports.
You can check the fair price for the time and route with hopper.com
Haneda is 20 minutes away from the main city. Haneda has less flights going in and out but is much closer than Narita. If you have the option to choose Haneda for the same price, then pick Haneda instead of Narita.
Narita is 1 hour away from the main city. (Never use a Taxi to get to Tokyo from Narita. The price could be anywhere from US$100-$300, and it often takes much longer than using the train) Trains and buses to and from the city range from US$10-30 per person, one way.