SciFriday is broadcast over the air Thursdays at 11:30 PM and Fridays at 9:30 PM Central Time on the PTL Network.
Watch the PTL Network on your computer, tablet, or smart phone by clicking here.
You can find SciFriday on the PTL Network in these markets:
| City and State | Service | Channel |
| Jonesboro, AR | NCTC | 240 |
| Little Rock, AR | NCTC | 240 |
| Palm Springs, CA | Frontier | 226 SD / 726 HD |
| Los Angeles, CA | Frontier | 226 SD / 726 HD |
| Sacramento, CA | Comcast | 88 / 1096 |
| Denver, CO | Comcast | 88 |
| Miami, FL | Hotwire | 275 SD / 486 HD |
| Naples, FL | Hotwire | 275 SD / 486 HD |
| Orlando, FL | Hotwire | 275 SD / 486 HD |
| Sarasota-Manatee, FL | Frontier | 226 SD / 726 HD |
| St. Petersburg, FL | Frontier | 226 SD / 726 HD |
| Tallahassee, FL | Frontier | 226 SD / 726 HD |
| Tampa, FL | Frontier | 226 SD / 726 HD |
| West Palm Beach, FL | Hotwire | 275 SD / 486 HD |
| Atlanta, GA | Hotwire | 275 SD / 486 HD |
| Augusta, GA | NCTC | 97 |
| Nahunta, GA | NCTC | 56 |
| Illinois | Frontier | 571 |
| Baltimore, MD | NCTC | 156 |
| Baltimore, MD | Verizon FIOS | 795 |
| Salisbury, MD | Verizon FIOS | 795 |
| Boston, MA | Verizon FIOS | 795 |
| New Bedford, MA | Verizon FIOS | 795 |
| Detroit, MI | Comcast | 386 |
| Minnesota | Frontier | 571 |
| Minneapolis, MN | Comcast | 190 |
| Ridgeland, MS | NCTC | 708 |
| Albuquerque, NM | Comcast | 88 |
| Albany, NY | Verizon FIOS | 795 |
| Buffalo, NY | Verizon FIOS | 795 |
| Elmira, NY | Verizon FIOS | 795 |
| New York, NY | Verizon FIOS | 795 |
| Schenectady, NY | Verizon FIOS | 795 |
| Syracuse, NY | Verizon FIOS | 795 |
| Troy, NY | Verizon FIOS | 795 |
| North Carolina | Frontier | 571 |
| Asheville, NC | NCTC | 229 |
| Allegheny, NC | NCTC | 229 |
| Avery, NC | NCTC | 229 |
| Lexington, NC | Piedmont | 227 |
| Watauga, NC | NCTC | 229 |
| Ohio | Frontier | 571 |
| Portland, OR | Ripley Fiber | 226 SD / 726 HD |
| Birdsboro, PA | NCTC | 480 |
| Harrisburg, PA | Verizon FIOS | 795 |
| Hazelton, PA | NCTC | 480 |
| Lancaster, PA | Verizon FIOS | 795 |
| Lebanon, PA | Verizon FIOS | 795 |
| Philadelphia, PA | Verizon FIOS | 795 |
| Pittsburgh, PA | Verizon FIOS | 795 |
| South Carolina | Frontier | 571 |
| Aiken, SC | NCTC | 97 |
| Memphis, TN | Millington | 240 |
| Spring City, TN | NCTC | 286 |
| Dallas/Fort Worth, TX | Frontier | 226 SD / 726 HD |
| Salt Lake City, UT | Comcast | 88 |
| St. Croix, Virgin Islands | St. Croix Cable | 342 |
| St. Croix, Virgin Islands | Caribbean Comm. | 342 |
| Charlottesville, VA | Verizon FIOS | 795 |
| Lynchburg, VA | Verizon FIOS | 795 |
| Newport News, VA | Verizon FIOS | 795 |
| Norfolk, VA | Verizon FIOS | 795 |
| Petersburg, VA | Verizon FIOS | 795 |
| Portsmouth, VA | Verizon FIOS | 795 |
| Roanoke, VA | Verizon FIOS | 795 |
| Richmond, VA | Verizon FIOS | 795 |
| Troutville, VA | NCTC | 157 |
| Waynesboro, VA | NCTC | 157 |
| Charleston, WV | Verizon FIOS | 795 |
| Clarksburg, WV | Verizon FIOS | 795 |
| Huntington, WV | Verizon FIOS | 795 |
| Weston, WV | Verizon FIOS | 795 |
| Seattle, WA | Frontier | 275 SD / 486 HD |
| Seattle/Tacoma, WA | Ripley Fiber | 275 SD / 486 HD |
| Camp Douglas, WI | NCTC | 141 |
| New Lisbon, WI | NCTC | 141 |
| Washington, D.C. | Verizon FIOS | 795 |