Entry to the One World Observatory costs from $34 for standard entry. When I went we bought the City Pass (from http://www.citypass.com/new-york) which allows entry to the top 6 New York attractions. Entry to the One World Observatory isn’t included but is well worth the expense for the views alone. We bought the City Pass rather than the NYC pass as the City Pass covered the main attractions we wanted to visit and was a lot cheaper. It allows you to visit The Empire State Building, the American Museum of Natural History and The Metropolitan Museum of Art. You can also choose from between the Top of the Rock Observation Deck/Guggenheim Museum, the Statue of Liberty and Ellis Island/Circle Sightseeing Cruise and the 9/11 Memorial & Museum/ the Intrepid Sea, Air and Space Museum. The City Pass costs $122 for an adult but as the entry to the Empire State Building costs $49 alone for me it was definitely worth getting. You also get a same day evening visit to the Empire State Building, and it was amazing to see the city lit up at night.
We flew with @British_Airways (thank you for the amazing upgrade onboard!)
(https://www.britishairways.com/travel/home/public/en_gb) and stayed at the beautiful Hotel Metro NYC just off 5th Avenue on 45 West 35th Street, New York, NY 10001
+1 (800) 356-3870