USPS Sunday delivery typically runs as late as early evening for most services, and sometimes into the night for Amazon packages and very time‑sensitive mail.

Typical Sunday cutoff times

  • For Priority Mail Express, USPS commonly guarantees Sunday delivery by around 6 p.m. to 6:30 p.m. local time; if it arrives later, you may be eligible for a refund of the service fee.
  • Many Express packages are delivered much earlier in the day, often by late morning or early afternoon, depending on the route and volume.

Amazon packages on Sunday

  • USPS also delivers certain Amazon parcels on Sundays under a separate agreement.
  • These Amazon deliveries can run later than normal mail; many areas see a window that can stretch to roughly 8 p.m., and some reports mention up to about 10 p.m. in busy periods, though most packages arrive earlier.

What “how late” usually means

  • For standard USPS Sunday operations, plan on deliveries being wrapped up by around 6–6:30 p.m. for Priority Mail Express, with Amazon packages possibly arriving later into the evening.
  • Local factors like weather, staffing shortages, peak season (holidays, big sales events), and your specific route can push things a bit later or allow carriers to finish earlier.

Quick tips if you’re waiting

  • If it is before 6–6:30 p.m. and you are tracking a Priority Mail Express item, it is still within the normal Sunday delivery window.
  • If an Express package misses the guaranteed time, check tracking and then contact USPS customer service to ask about a postage refund.
  • For Amazon orders using USPS, rely on the tracking details in your Amazon account, which often specify the “arriving by” time for that particular Sunday.

Information gathered from public forums or data available on the internet and portrayed here.