Combined league history of the USFL and the XFL

• 1983 (original incarnation) - Michigan Panthers (only title)
• 1984 (original incarnation) - Philadelphia Stars (first title)
• 1985 (original incarnation) - Baltimore Stars (second title, formerly Philadelphia Stars)
• 1986-87 (original incarnation) - League cancelled due to financial difficulties
• 2010-16 (attempted second incarnation) - League cancelled before play began
• 2022 (second incarnation) - Birmingham Stallions (first title)
• 2023 (second incarnation) - Birmingham Stallions (second title)
• 2024 (second incarnation) - Reassigned as the USFL Conference for the UFL

• 2001 (original incarnation) - Los Angeles Xtreme (only title)
• 2002 (original incarnation) - League cancelled due to financial difficulties
• 2020 (second incarnation) - League suspension due to COVID-19, though the Houston Roughnecks had the best win-loss performance prior to the suspension
• 2021-22 (second incarnation) - League postponed due to restructurings
• 2023 (second incarnation) - Arlington Renegades (first title)
• 2024 (second incarnation) - Reassigned as the XFL Conference for the UFL