Cheapest Way to Ship a Package from Florida to Mexico: USPS Flat Rate

Best Value: USPS International Flat Rate

The United States Postal Service (USPS) offers the lowest reliable rates for parcels ≤20 lbs to Mexico.

Service	Max Weight	Transit	Insurance	Best For
First-Class Package International	4 lbs (1.8 kg)	10–20 business days	None (addable)	Light, low-value items
Priority Mail International Flat Rate Envelope	4 lbs	6–10 business days	$200 included	Documents, small goods
Priority Mail International Flat Rate Box (Med/Lg)	20 lbs (9 kg)	6–10 business days	$200 included	Heavier, dense items
Priority Mail International (weight-based)	70 lbs	6–10 business days	$200 included	Irregular shapes, precise pricing

Use free USPS Flat Rate boxes/envelopes (order online).
Pack densely—dimensions fixed, weight up to limit.
Declare accurate value; under-declaring risks seizure.
Complete CN22/CN23 customs form (contents, HS code, value, recipient).
Compare DHL eCommerce, UPS Simple Rate, FedEx International Connect for >20 lbs or time-sensitive.