Looking at expedited options to the UK, USPS is the winner again in all the package weights we analyzed with its 3-5 day, trackable Priority Mail Express International service. It’s again worth noting that FedEx and UPS do accept packages up to 150 lbs, whereas the USPS limit is 66 lbs.
International Shipping Options to the UK
(1) Includes residential surcharge of $3.65 and fuel surcharge of 3.25%.
(2) Includes residential surcharge of $3.65 and fuel surcharge of 3.5%. These fuel surcharges are valid as of April 2016
(3) *PMEI also offers flat rate envelopes for shipments up to 4 lbs, which may be more economical than the options shown here; visit https://www.usps.com/international/priority-mail-express-international.htm.