What Is the Cheapest Way to Pay for International Letter Postage?
Want to send an international letter from the U.S. without overpaying? The cheapest method is simple: use First-Class Mail International and pay the exact postage required. For a standard 1-ounce letter, a single $1.75 Global Forever stamp gets the job done. You won't save money by using domestic stamps, old denominated stamps, or paying cash at the counter—the official rate stays the same. The real trick to saving money is choosing the right mail class, keeping your envelope standard size, avoiding overpayment, and buying stamps without extra service fees.
Finding the Cheapest International Letter Postage
For ordinary paper correspondence, First-Class Mail International is the United States Postal Service's least expensive international letter service. A rectangular, machinable letter or postcard weighing no more than 1 ounce costs $1.75 to any country where the service is available. Delivery time varies by destination, and basic First-Class Mail International letters do not include tracking or insurance.
The key phrase is ordinary paper correspondence. USPS does not allow merchandise in First-Class Mail International letters. A sticker sold to a customer, jewelry, a key, or another dutiable item may need an international package service even if it fits inside an envelope. Choosing a letter rate for merchandise is not a legitimate saving.
| Mailing situation | Lowest suitable approach | Postage starting point |
|---|---|---|
| Standard letter, up to 1 oz | One Global Forever stamp or exact $1.75 postage | $1.75 |
| Letter over 1 oz | Exact First-Class Mail International rate | Varies by weight and destination |
| Large envelope or flat | First-Class Mail International flat rate | $3.30 |
| Square, rigid, or uneven letter | Letter rate plus nonmachinable surcharge | Add $0.49 |
| Merchandise or tracking needed | Compare eligible international package services | Not eligible for the basic letter rate |
Rates in this article come from USPS Notice 123 , effective July 12, 2026. Check the USPS calculator before mailing if the envelope is close to a weight or size limit.
Global Forever Stamps for International Letters
A Global Forever stamp is usually the best choice for a qualifying 1-ounce international letter because its mailing value matches the full $1.75 rate. One stamp avoids arithmetic, leaves a clean address area, and remains valid for the same service after a future price increase.
That convenience does not mean the stamp creates a discount. Its value equals the current 1-ounce First-Class Mail International rate. If you already own a genuine unused Global Forever stamp purchased at an earlier price, it still covers the current rate. The site's Global Forever stamps collection lets readers compare available designs and quantities, but unit price, shipping, and order size should be checked before deciding where to buy.
For a single mailing, buying at a Post Office can also avoid the handling fee applied to small stamp orders at the USPS online store. USPS currently lists its 2026 Postcrossing Global stamps in a sheet of eight for $14.00, and the online store states a $2.10 handling fee for domestic stamp orders up to $50.
Exact-Value International Letter Postage
You do not need a stamp labeled “Global” if the total postage is correct. USPS accepts combinations of valid unused U.S. stamps, so older denominated stamps or domestic Forever stamps can pay an international rate.
As of August 2026, one domestic Forever stamp is worth $0.82. Two are worth $1.64, which is 11 cents short of the $1.75 international rate. Add 11 cents in denominated postage, and the total is exact. Three domestic Forever stamps total $2.46, so using three on the same 1-ounce letter wastes 71 cents.
This approach is cheapest when the stamps are already in your drawer. Buying several denominations only to build $1.75 may be less convenient than buying one Global Forever stamp, especially if an online order adds handling or shipping. If you are using older domestic stamps, the site's explanation of why Forever stamps do not expire clarifies how their current mailing value works.
How Weight Changes International Letter Postage
The $1.75 price ends when a letter exceeds 1 ounce. USPS prices heavier letters by both destination price group and weight, up to the 3.5-ounce letter limit. At 2 ounces, the July 2026 retail price is $2.35 to Canada, $2.60 to Mexico, and $3.50 for price groups 3 through 9.
Weigh the sealed envelope, not the paper by itself. The envelope, inserts, photos, card stock, stickers used as decoration, and sealing material all count toward the postal weight. If the total sits close to 1 ounce, a Post Office scale is safer than guessing.
The cheapest correction is often removing an unnecessary insert or switching to lighter paper while keeping the mailpiece suitable for its purpose. Do not split required documents between two letters without comparing the two $1.75 base charges against the correct heavier-letter price. Use the USPS International Price Calculator for the destination-specific answer.
Shape Raises International Postage Costs
Letter postage assumes a rectangular envelope that automated equipment can process. USPS lists a maximum letter size of 11.5 inches long, 6.125 inches high, and 0.25 inch thick. A letter can also become nonmachinable if it is square, rigid, wrapped in plastic, closed with clasps or strings, uneven in thickness, or addressed parallel to its shorter edge.
The current international nonmachinable surcharge is $0.49. A 1-ounce letter that would otherwise cost $1.75 therefore needs $2.24 when the surcharge applies. A large envelope starts at $3.30, and a rigid or nonuniform flat may be charged as a package.
This is where design choices become postage choices. Use a standard flexible envelope, remove a bulky closure, and place inserts so the thickness stays even. If the letter must be square, rigid, or unusually styled, pay the correct rate rather than hoping it passes through unnoticed.
Buying International Letter Postage
Choose the buying channel based on how many letters you are sending and what postage you already own.
- One letter today: Buy one Global Forever stamp or exact postage at a Post Office. This avoids a small online stamp-order handling fee.
- Several 1-ounce letters: Compare the per-stamp price, quantity, shipping, and seller credentials before ordering. Start with the site's international stamp collection.
- Stamps already on hand: Combine their current values to reach the exact rate. The Forever stamp price guide provides the current domestic Forever value.
- Heavy or unusual letters: Ask for an exact counter calculation or use an authorized PC Postage provider. USPS says First-Class Mail International postage is not available through Click-N-Ship.
Paying by cash, check, card, stamps, or a postage meter strip changes the transaction method, not the retail postage requirement. The winning option is the one that reaches the correct value without a purchase fee, excess postage, or a classification mistake.
International Letter Postage FAQs
Is a Global Forever stamp cheapest?
It is the simplest exact payment for a qualifying 1-ounce international letter. Another valid stamp combination totaling $1.75 pays the same USPS postage.
Can domestic Forever stamps work internationally?
Yes. Their combined current value must equal or exceed the required international postage. USPS does not automatically credit excess stamps; eligible international postage overpayments may be submitted for refund review.
Does international letter postage include tracking?
No. Basic First-Class Mail International letters do not include tracking or insurance; available extra services and country restrictions vary.
Can I mail merchandise as a letter?
No. USPS states that merchandise may not be sent using First-Class Mail International letter service, so compare eligible package services instead.
Where should I verify current postage?
Use the USPS International Price Calculator or ask a postal clerk to weigh and classify the sealed envelope before mailing.
For a standard 1-ounce letter, choose one Global Forever stamp or an exact $1.75 combination. If anything about the weight or shape is uncertain, take the sealed envelope to a Post Office before attaching postage, then browse Mailbox of Flushing only after you know which stamp value you need.