Fly an A-10C.
In all seriousness, there isn't much you can do at the moment. I'd recommend getting your mates to fly a SEAD role, or flying with several wingmen to decoy the SAMs while you make your strike or vice versa.
Flying low and using the terrain to your advantage also works as well as it can. I manage sometimes to roll out of terrain cover and make a burner, low level bombing pass on SAMs, but only if you have an exact bead on where they are.