u/Direct_Hedgehog104

I am going to be flying from PVG-SFO in Polaris and SFO-IAD in Economy. I booked the segments separately because the SFO-IAD in First significantly increases (doubles) the cost of the PVG-IAD itinerary. I am wondering if I would be able to access the Polaris lounge at IAD, since it would be same-day as my Polaris ticket (and nice to grab dinner before I get home super late). Or would I only have access in SFO since that's where my Polaris itinerary terminates? Thanks!