If you're leaving from the north end of the Springs (where the AF Academy is), you shouldn't have any trouble at that end. The bad traffic in the Springs is farther south. On the other hand, leaving the Springs at 4 will put you in the heart of rush hour once you get to Denver. Also, I'd allow at least two hours to get from the Springs to DIA regardless of traffic.
Ask the rental car people whether you can take E-470. It's a tollway, but it uses some complicated automatic billing system rather than cash tolls. You can take that from the far south end of the Denver metro area all the way to Pena Blvd. (the airport road). It should be much, much faster than I-225. Under no circumstances should you take I-25 all the way north to I-70.
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