UPS will introduce a surcharge on shipments from the U.S. to Canada effective May 18, just before a potential strike at Canada Post that could affect parcel delivery. The fees vary by service, including a $0.49 per-package charge for UPS Standard shipments and a $1.25 per-pound fee for UPS Worldwide Economy. This fee will remain until further notice as UPS aims to ensure service quality. A potential strike at Canada Post could lead to increased demand for other carriers, although many may be hesitant to take on new customers during this time.

Source: https://www.supplychaindive.com/news/ups-us-canada-surge-fee-postal-strike/747785/