When the current incarnation of SH-1 was established, the middle of SH-63 was turned over to the new highway, leaving SH-63 in two separate parts.

SH-63 heads northeast from Kiowa, passing through Pittsburg and crossing under the Indian Nation Turnpike near Blanco.

[1] On April 1, 1936, the highway was extended east to end at the Arkansas state line.

The highway was extended west for the first time on August 4, 1952, when SH-63's western terminus was set at US-270 near Hartshorne.

[5] Minor realignments to the highway occurred on September 6, 1962 northwest of the northern SH-2 junction, and through Haileyville and Hartshorne on August 3, 1964.

[1] The portion of highway between Haileyville and Talihina was made solely part of SH-1.

This left SH-63 in two discontinuous sections, one between Kiowa and Haileyville and one from Talihina to the Arkansas line.