If you are sending a letter via USPS First Class Mail, which is the most common option for letters, the estimated delivery time is 2-5 business days. This means that the letter should arrive in Fresno, CA, within 2 to 5 business days after it is mailed in Springfield, IL. However, it's important to note that these estimates are just guidelines and actual delivery times may vary.
If you need the letter to arrive faster, you can choose a faster shipping option, such as USPS Priority Mail or USPS Express Mail, which typically deliver in 1-3 business days. These services come at a higher cost compared to First Class Mail.
To get a more accurate delivery time, you can check with your local post office or use the USPS online postage calculator, which can provide estimated delivery dates based on the origin, destination, and shipping method.
Additionally, the time of year can also affect delivery times. During peak seasons such as the holidays, mail volume tends to increase, which may result in longer delivery times.
If you are concerned about the timely delivery of your letter, you can also consider using a private courier service like FedEx or UPS, which offer guaranteed delivery options.