How much does it cost to send a letter from US to Calgary?

As of October 2023, sending a letter from the U.S. to Canada, including Calgary, typically costs around $1.40 for a standard First-Class Mail International stamp. Prices may vary based on the weight and size of the letter, as well as any additional services like tracking or insurance. It's always best to check the U.S. Postal Service's official website for the most current rates and options.