USPS Postage Rates: 1 Ounce Letter from US to South Korea

Current USPS rates for mailing a 1-ounce letter from the United States to South Korea:

• Standard Letter (First-Class Mail International): $1.40
• Large Envelopes/Flats: $4.00
• Priority Mail International Flat Rate Envelope: $47.95

Rates are subject to change. For the most current pricing, visit the USPS International Mail page or consult your local post office. Delivery times typically range from 7-21 business days for First-Class Mail International.