How long will standard flat rate shipping service be if it is from missouri to texas?

Question

Fenton, Missouri to Houston, Texas

Answer 1

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I'm not sure what you mean by standard flat rate service.

The only flat rate service that I am aware of is USPS has flat rate Priority mail service, which should be 2-3 days. Priority mail, however wouldn't be considered standard service.

Parcel post would be 3-7 days. Fedex or UPS ground 3-5 days.