Definitely not a standard cost per foot for this type of job - I would get bids on a lump-sum basis. The scope of work should be pretty straight forward - remove deteriorated boards, remove soffit material and fascia as needed to clear nests, reinstall soffit coers and install new painted fascia board, install flashing, patch stucco if needed and paint.
Personally, I would use a roofer because the most important part of this job is the flashing. The stucco should be left untouched if possible, as that would require a stucco contractor and painter to repair. If they have to cut into it a bit to remove the soffit covers, by casrefully cutting with a utility knife they should be able to reinstall soffit covers and caulk the cut edge with semi-matching caulk.
The fascia board and soffit covers should hold clear of the adjacent roof by about 1-2 inches to keep them dry and prevent wicking along them, and the intervening gap should be covered by (depending on configuration) either extra-wide L flashing, or step flashing if walking up the roof under shingles. Then the overlying butted roof or valley should have a valley or edge (as applicable) flashing installed to cause runoff to project out onto the lower roof surface rather than trickle around the corner and down along the fascia board and new L flashing.
I would also strongly recommend having prepainted metal fascia board cover to protect it from splash in the adjoining roof interface area.
It is very rare that the eave covers reach all the way back to contact the surface of the sheathing from the lower roof surface, so you will also probably need flashing or bug screening installed to fill any gap between the eave covers and the sheathing of the lower roof - usually bug screening is fastened from the furthest back joist down to the sheating, from back of fascia board to the house face. Can be painted if it shows, but usually so far back inthe oerhang it is not noticeable.
Hard to tell how much you are into here, but assuming only 1 piece of fascia board and no soffit coer needs replacing, I would guess about $200-300.