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The asker should've provided more context. In the US, Priority Mail is faster than regular mail and can take (3-5, although it can also take longer). Express Mail on the other hand, it's usually overnighted and it's for documents and small parcels. So if the source text was written in US English, using 'urgente' or 'expreso' to refer to Priority Mail could be misleading.
Automatic update in 00:
3 mins confidence: peer agreement (net): +3
Correo expreso o Correo Certificado Expreso
Explanation: Expreso gives it the quality of priority. Certificado just means it is traceable
traductorchile Chile Local time: 02:16 Native speaker of: English, Spanish PRO pts in category: 4