Depending on the route you take from Tucson International Airport to Dallas/Fort Worth International Airport, about 9 hours into the trip, you could stop in Midland (Texas), Texas:
Stopping points from Tucson International Airport to Dallas/Fort Worth International Airport
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John Wu is correct - Midland (Texas) is 9 hours from Tucson International Airport That leaves about 5 hours from there to get to DFW Airport
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Michelle