Lot's of options. North of Oregon it seems most runs are around 40 miles. Mid Oregon it's about half that. San Diego boats go to Mexico for 2-7 day trips. North is Albacore, south is Yellowfin/Bigeye. The Bigeye can be 80-120#. The longer San Diego trips target larger fish; 200# & up.
Water temps & sea conditions in the north are more iffy; trips get cancelled.
Cost is all about the fuel burned & the gear required; if you split costs locally you will probably need your own gear. I'd do a charter in Oregon & maybe combine a Halibut trip as they often still have Halibut quota in late summer.