San Francisco or San Jose to Brussels round trip tickets are priced from $355 to $390 for travel departures from Mid-February to early May. Low fares return again in September. Ticket prices are mid-$400s to low $500s for late May and early June departures. These ticket prices are available with Oneworld and SkyTeam airline partners from SFO and SJC.
There are combinations of Oneworld Alliance airlines available with American Airlines, British Airways, Finnair and Iberia or SkyTeam Delta and KLM.
Finnair San Francisco SFO – Helsinki HEL – Brussels BRU – HEL – SFO
KLM/Delta flights San Jose to Brussels with 23 hours layover in Amsterdam
San Jose SJC – Seattle SEA – Amsterdam AMS – Brussels BRU – AMS (23 hours) – Salt Lake City SLC – SJC
There are tickets priced as low as $363 on these same dates for other Delta flights.