US Senate seats that are likely to change parties in 2020,2022, and 2024.

2020(D to R)
AL(Jones-D) if Republicans don't nominate Moore-R again. -1D
2020(R to D)
AZ special (McSally-R) Kelly-D
CO(Gardner-R) Hickenlooper-D
KS(OPEN Roberts/Kobach-R) Grissom-D
NC(Tillis-R) Cunningham-D
3 or 4 Republican held US Senate seats up in 2020 will flip to the Democrats.
2022(D to R)
AZ(Kelly-D) if a Top Tier Republican like Ducey-R runs. -1D
2022(R to D)
FL(Rubio-R) If Gwen Graham-D is the Democratic Nominee.
NC(OPEN Burr-R) if Roy Cooper-D is the Democratic Nominee.
PA(Toomey-R) If Conor Lamb-D is the Democratic Nominee.
WI(Johnson-R) If Ron Kind-D is the Democratic Nominee.
4 Republican held US Senate seats up in 2022 will flip to the Democrats.
2024(D to R)
None.
2024(R to D)
FL(Scott-R) If Debbie Mucarsel Powell-D or Stephanie Murphy-D run.
TX(Cruz-R) If Lizzie Fletcher-D or Colin Allred-D run.