How long does it take to mail a letter?

The official answer: 1 to 5 days

USPS lists First-Class Mail as delivered in 1–5 days. The exact number for your letter is its service standard: the number of days USPS expects delivery to take once it has accepted the mail — not a money-back guarantee. USPS sets that standard for each pair of 5-digit ZIP codes, so the same letter can take 2 days across town and 5 across the country. For a specific date instead of a range, enter both ZIP codes and your mailing date in the free USPS Service Commitments tool on usps.com.

What makes a letter take longer

• The day you mail it. Saturdays count as a delivery day; Sundays and federal holidays don't. A letter mailed on Saturday, or the day before a holiday, is expected later.
• Distance and route. The service standard is set per ZIP code pair — not by straight-line distance alone.
• Missing the collection time. Drop your letter in a box after the last pickup of the day and it starts moving the next day.
• The envelope. Square, rigid, or lumpy envelopes are "nonmachinable" — they cost more and are processed by hand, which is slower.
• Peak season and weather. Around December holidays or during severe weather, delivery can run past the standard.

Faster ways to send a letter

If 1–5 days isn't fast enough, USPS sells two quicker (and pricier) services:

• Priority Mail — typically 1–3 days, with delivery estimates rather than a guarantee.
• Priority Mail Express — overnight to most addresses, and the only service with a money-back delivery guarantee. It also delivers on Sundays and holidays for an extra fee.

Note that certified or tracked options add proof of mailing and delivery — they don't make the letter move any faster.

The delay you can actually control

Most "slow" letters weren't slowed by the Postal Service — they left late. Printing the letter, finding an envelope, addressing it, and getting to a postbox before the last collection is where days quietly disappear. Get your letter accepted by the post office today, and the 1–5 day clock starts today.

That's the part Postmark Today takes over: upload your letter as a PDF before 2:00pm ET on a weekday and we print, envelope, stamp and hand it to the post office the same day.