1. First-Class Mail International:
- Letter up to 1 oz (28 grams): 1.30 USD
- Each additional ounce (up to 13 oz): 1.20 USD
2. Priority Mail International:
- Flat Rate Envelope (up to 4 lbs / 1.8 kg): 29.50 USD
- Flat Rate Box (up to 20 lbs / 9 kg): 64.75 USD
3. Global Express Guaranteed (GXG):
- Up to 4 oz (113 grams): starting at 39.95 USD
- Additional weight rates apply
4. Registered Mail International:
- Additional to postage: 21.25 USD
5. Certified Mail International:
- Additional to postage: 11.95 USD
Please note that these prices are approximate and may change from time to time. It's always best to check the official USPS website or visit your local post office to get the most up-to-date rates and specific requirements for mailing a letter to Indonesia.