USPS Mailing Costs: US to Puerto Rico (Domestic Rates Apply)

Puerto Rico is a US territory — mail from the 50 states to PR uses domestic USPS rates, not international.

Current Rates (2024)

• Postcard: $0.56 (domestic postcard rate)
• First-Class Letter (1 oz): $0.68 (Forever stamp)
• Additional Ounces: +$0.24/oz (up to 3.5 oz)
• Large Envelope / Flat (1 oz): $1.39
• First-Class Package (up to 13 oz): Starts ~$4.50 (varies by zone/distance)
• Priority Mail Flat Rate Envelope: $9.65
• Priority Mail Flat Rate Boxes: M $17.05, L $22.80
• Priority Mail Express: Starts ~$30.45 (1–2 day guarantee)

Key Points

• No customs form for letters/flats. Packages >1 lb or commercial value: PS Form 2976 (customs) — but still domestic.
• Delivery: 2–5 business days (First-Class), 1–3 (Priority), 1–2 (Express).
• Zone-Based Pricing: PR is Zone 9 from most origins — affects Package/Priority non-flat-rate pricing.
• Forever Stamps Work: Standard Forever = PR letter.

The $1.30/$1.50/$9.45 figures in the source reflect outdated or international-rate confusion. PR = domestic. Always verify at USPS.com or counter.