| Date | Transaction |
| 02-28-1981 | Bill Flanigan has retired from the Boston Copperheads. |
| 08-31-1980 | Bill Flanigan of the Boston Copperheads is injured with a shoulder ligament sprain and is expected to be out for approximately 25 days. |
| 10-15-1972 | The Boston Copperheads have moved Bill Flanigan to the active roster. The Boston Copperheads have moved Jim Nelson to the inactive roster. |
| 09-25-1972 | The Boston Copperheads have moved Will Shiner to the active roster. The Boston Copperheads have moved Bill Flanigan to the inactive roster. |
| 08-07-1972 | The British Columbia Legionaires have moved Bernard Phillips, Chad Stephens, Bill Dimancheff, Bill Flanigan, and Jim Nelson to the active roster. The British Columbia Legionaires have moved Sean Harlow, Bill Pelluer, Dick Knutson, Louis Ottis, and Ted George to the inactive roster. |
| 08-07-1972 | Trade #50740 has been completed between the British Columbia Legionaires and the Los Angeles RAMS. The Los Angeles RAMS receive Bill Geyer (QB) from the British Columbia Legionaires in exchange for Jack Austin (QB), Bill Flanigan (CB). |
| 04-30-1972 | The Los Angeles RAMS have moved Bill Flanigan, Billy Curry, and Ed Morze to the active roster. The Los Angeles RAMS have moved Nick Phillips, Walter Elston, and Blake Devlin to the inactive roster. |
| 01-02-1972 | The Los Angeles RAMS have moved Dick Swanke to the active roster. The Los Angeles RAMS have moved Bill Flanigan to the inactive roster. |
| 01-04-1971 | The Los Angeles RAMS have moved Bill Flanigan to the active roster. The Los Angeles RAMS have moved Bernie Gloden to the inactive roster. |
| 12-07-1970 | The Los Angeles RAMS have moved Bill Flanigan to the inactive roster. |
| 09-14-1970 | The Los Angeles RAMS have moved Bill Flanigan to the active roster. The Los Angeles RAMS have moved Mardye Jessie to the inactive roster. |
| 09-14-1970 | The Los Angeles RAMS have acquired Bill Flanigan from the waiver wire. |
| 09-13-1970 | The Colorado Dimebags have automatically waived Bill Flanigan to comply with the 53-man roster limit. |
| 09-06-1970 | The Colorado Dimebags have moved Bobby Brace, Mike Tillman, Ralph Gilliam, Napoleon Brown, Mark Hickman, Leon Davis, Howard Thomas, Mike Adkins, and Leon Warner to the active roster. The Colorado Dimebags have moved Louis Ottis, Andy Caldwell, David Seymour, Anthony Moten, Bill Flanigan, Bill Bradley, Speedy Bean, Chris Watson, Larry Barwegan, and Bob DeLong to the inactive roster. |
| 12-14-1969 | The Colorado Dimebags have moved Bill Flanigan and Robert Petchel to the active roster. The Colorado Dimebags have moved Chris Allison and Stan Geathers to the inactive roster. |
| 12-01-1969 | The Colorado Dimebags have moved Ronald "RoJo" Johnson, Ira Morgan, James Geyer, and Allen Moreno to the active roster. The Colorado Dimebags have moved Bob DeLong, Bill Flanigan, George McNeil, and Louis Ottis to the inactive roster. |
| 08-04-1969 | The Colorado Dimebags have moved Bill Frank, Jerry Luke, Dewayne Watson, Nick Snelling, Bill Flanigan, Bob DeLong, and Ed Carrell to the active roster. The Colorado Dimebags have moved Mark Hickman, Mark Simmons, and Robert Petchel to the inactive roster. |
Cornerback