It would be great if we could upload zone charts from carriers so that would make it more accurate for custom shipping. I know we could hook into the API and get it from them directly, but there are a couple of reasons we want to make slight adjustments (more than the flat percentage adjustment that is already able to be done).

The state method is simpler to setup than down to the zip code, but obviously less accurate as a state can have more than one shipping zone. It would be great if there was an option to set the postal zones by zip code via csv obtained from the carriers.

UPS zone charts can be downloaded here: https://www.ups.com/us/en/support/shipping-support/shipping-costs-rates/daily-rates

USPS zone charts: https://postcalc.usps.com/DomesticZoneChart

Just to be clear, you are looking to show "time in transit"?

Thanks,
David

No, not for time in transit, but for the actual shipping cost. It would be great if we could be more granular to set pricing down to the zip code level instead of just the state. A state can have more than one shipping zone. Since there are so many zip codes, it would likely have to be something that was done via CSV. Most of the carriers determine the zone based on the first 3 numbers. It would be great if it could take the csv file from UPS, USPS, etc. and set the shipping zones based on their files. It would just give a little more accuracy and customizing instead of just using the rates from the carrier's servers. Since we are on one coast, we like to slightly increase the zones 2-4 and slightly decrease the zones 7-8 so shipping costs feel a little more even.

Hi Atlend, sorry, but I'm confused here.
The cart is integrated with USPS, FedEx, and UPS among others that provide accurate rates.
Are you using a different carrier?
Thanks,
David