The cheapest Birmingham to San Francisco return flight on the radar right now is £477, flying with British Airways via one or more connections. It covers departures in November 2026, and every dated link below opens that exact BHX–SFO search on Skyscanner. That is roughly 20% below the £598 this route usually costs. Across 53 recorded checks it has ranged between £378 and £783. Our sampling points to November 2026 as the cheapest month to fly Birmingham to San Francisco.
We do not post a price and leave it to age. Each fare is re-checked against Skyscanner on a schedule and carries the time it was last confirmed. Not flying from Birmingham? We track 57 other departure cities for San Francisco, listed at the foot of this page.
Cheap fares do not hang around. If this one has already gone, nudge the dates either way by a day or two; Birmingham to San Francisco is usually still decent value around the same window.