Sleepless in Seattle was filmed in Seattle, Baltimore, New York, & Chicago in the United States of America.
Seattle-Tacoma International Airport - Gate N7 (Closed)
In movie
Scene where Sam and Jonah are at the airport saying goodbye to Victoria when Sam sees Annie for the first time just when he says to Sam “Everybody's an adjustment, nobody's perfect. There's no such thing as a perfect ….”
Real
Scene was shot This scene was filmed in the North Satellite (Gate N7) of the Seattle- Tacoma International Airport.
Seattle–Tacoma International Airport (SEA), also referred to as Sea–Tac Airport is the primary commercial airport serving the Seattle metropolitan area in the U.S. state of Washington.
The airport is located in the city of SeaTac, approximately 14 miles (23 km) south of Downtown Seattle.
Update:
Unfortunately this piece of Seattle-Tacoma International Airport history that was featured in "Sleepless in Seattle" is now closed for good. It was part of a major $658 million renovation project (2019). Port of Seattle employees held a small 'Goodbye to the Sleepless in Seatle gate' ceremony at Gate N7 in June 2019.
Seattle
Hall of the Empire State Building
In movie
Scene where Although it's late, Annie tries the convince the concierge to let her go upstaires to have a look.
Real
Scene was shot The Empire State Building is a 102-story Art Deco skyscraper in New York City. The building has a roof height of 1,250 feet (380 m) and is 1,454 feet (443.2 m) tall, including its antenna. Its name is derived from 'Empire State', the nickname of New York. It was designed by Shreve, Lamb & Harmon and completed in 1931. Construction started on March 17, 1930, with an average construction rate of one floor per day.
New York