U.S. USPS Ground Advantage vs. Priority Mail Flat Rate: Two Zone 8 Retail Price Checks
For October 4, 2026 through January 17, 2027, compare published U.S. retail postage for Zone 8 packages at not over 5 lb and not over 10 lb with three separately listed Flat Rate box prices.
Published U.S. retail prices show different results by profile: at not over 5 lb, two Flat Rate prices are below Ground Advantage; at not over 10 lb, all three are below it. Eligibility is not established.
The U.S. retail price answer
Source[1]
At not over 5 lb in Zone 8, the published Ground Advantage price is $27.45. The separately listed Small and Medium Flat Rate prices are lower by $12.80 and $1.65, respectively, while the Large Flat Rate price is $8.65 higher.[1]
At not over 10 lb in Zone 8, the published Ground Advantage price is $40.85. The separately listed Small, Medium, and Large Flat Rate prices are lower by $26.20, $15.05, and $4.75, respectively.[1]
Published U.S. postage side by side
Source[1]
| Zone 8 weight bracket | Ground Advantage | Small Flat Rate | Medium Flat Rate | Large Flat Rate |
|---|---|---|---|---|
| Not over 5 lb | $27.45 | $14.65 — $12.80 lower | $25.80 — $1.65 lower | $36.10 — $8.65 higher[1] |
| Not over 10 lb | $40.85 | $14.65 — $26.20 lower | $25.80 — $15.05 lower | $36.10 — $4.75 lower[1] |
How the price choice changes by profile
Source[1]
The Large Flat Rate price changes position across these two comparisons. It is above Ground Advantage for the not over 5 lb profile but below Ground Advantage for the not over 10 lb profile. Small and Medium Flat Rate prices are below Ground Advantage in both checks.[1]
Confirm box fit and applicable eligibility requirements before choosing among the compared options.
What the U.S. comparison does not establish
Source[1]
The evidence does not determine shipment eligibility for the separately listed Flat Rate boxes. It also does not infer extra fees or delivery commitments, and it excludes negotiated, cubic, and international prices.[1]
Checks to make before choosing
- Confirm that the shipment fits the specific Flat Rate box you are considering.
- Confirm that the shipment satisfies the applicable eligibility and packaging conditions.
- Obtain the complete postage total and account for any added charges before comparing your final cost.
- Evaluate timing and other service requirements separately from this base-postage comparison.
Sources and evidence
1 sourceEach source is tied to a visible claim in the article. Access dates show when BoslogShip last verified the cited page.
- [1]
Official primary source · United States Postal Service
Final U.S. USPS domestic parcel postage: retail and commercial samplePublished September 18, 2026 · Accessed October 26, 2026
Supports: For U.S. retail postage effective October 4, 2026 through January 17, 2027, a Zone 8 USPS Ground Advantage package at not over 5 lb is $27.45; separately listed Priority Mail Flat Rate box prices are $14.65 Small, $25.80 Medium, and $36.10 Large.
Data as of 2026-10-26
Supports: For U.S. retail postage effective October 4, 2026 through January 17, 2027, a Zone 8 USPS Ground Advantage package at not over 10 lb is $40.85; separately listed Priority Mail Flat Rate box prices are $14.65 Small, $25.80 Medium, and $36.10 Large.
Data as of 2026-10-26
Supports: For the U.S. retail not over 5 lb Zone 8 profile, Ground Advantage's published postage is $12.80 more than the separately listed Small Flat Rate Box price during the effective window.
Data as of 2026-10-26
Supports: For the U.S. retail not over 5 lb Zone 8 profile, Ground Advantage's published postage is $1.65 more than the separately listed Medium Flat Rate Boxes price during the effective window.
Data as of 2026-10-26
Supports: For the U.S. retail not over 5 lb Zone 8 profile, the separately listed Large Flat Rate Boxes price is $8.65 more than Ground Advantage's published postage during the effective window.
Data as of 2026-10-26
Supports: For the U.S. retail not over 10 lb Zone 8 profile, Ground Advantage's published postage is $26.20 more than the separately listed Small Flat Rate Box price during the effective window.
Data as of 2026-10-26
Supports: For the U.S. retail not over 10 lb Zone 8 profile, Ground Advantage's published postage is $15.05 more than the separately listed Medium Flat Rate Boxes price during the effective window.
Data as of 2026-10-26
Supports: For the U.S. retail not over 10 lb Zone 8 profile, Ground Advantage's published postage is $4.75 more than the separately listed Large Flat Rate Boxes price during the effective window.
Data as of 2026-10-26
Supports: In the U.S. published-postage comparison, Priority Mail Flat Rate box prices are separately listed and shipment eligibility is not inferred.
Data as of 2026-10-26
Supports: The U.S. postage sample does not infer negotiated prices, cubic rates, extra fees, international rates, a prior baseline, or delivery commitments.
Data as of 2026-10-26