Phillipsburg, MO
Little rock ar
If you take I-35 South to Oklahoma City, then the HE Bailey Turnpike to Lawton that is about halfway - it is about 835 miles from KC to Houston and Lawton is halfway on that route. You can also take I-35 to Dallas and going that way Ardmore, OK is about half way - maybe a few miles short of halfway.
A typical flight between Dallas, TX and Lawton, OK would have a flying time of about 19 minutes.
Billings ok
378 miles
About 190 miles on I-44 and 3 hours driving time.
Altus, OK is located approximately 90 miles southwest of Lawton, OK. The driving distance between the two cities is about 110-120 miles, depending on the route taken.
Atoka OK
West Plains, Missouri is halfway between Tulsa and Clarksville
Jackson, TN.
The I-35 and Highway 60 junction west of Ponca City, OK will be approximately halfway.