Cheap Flights from Seattle to Silicon Valley: SEA→SJC from HK$541

View HK$541 flight on Sat, 4 Oct 2025Opens in a new window

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Find Cheap Flights from Seattle (SEA) to Silicon Valley (SJC)

Prices were available within the past 7 days and start at HK$541 for one-way flights and HK$1,081 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Tue, 19 Aug - Tue, 2 Sep
SEA
Seattle
SFO
San Francisco
HK$1,081 Return, found 2 hours ago
HK$1,081
Return
found 2 hours ago
Select Delta flight, departing Tue, 19 Aug from Seattle to San Francisco, returning Tue, 2 Sep, priced at HK$1,081 found 2 hours ago
Delta
Tue, 19 Aug - Mon, 1 Sep
SEA
Seattle
SFO
San Francisco
HK$1,156 Return, found 2 hours ago
HK$1,156
Return
found 2 hours ago
Select Delta flight, departing Tue, 19 Aug from Seattle to San Francisco, returning Mon, 1 Sep, priced at HK$1,156 found 2 hours ago
United
Tue, 19 Aug - Tue, 26 Aug
SEA
Seattle
SFO
San Francisco
HK$1,361 Return, found 2 days ago
HK$1,361
Return
found 2 days ago
Select United flight, departing Tue, 19 Aug from Seattle to San Francisco, returning Tue, 26 Aug, priced at HK$1,361 found 2 days ago
American Airlines
Thu, 18 Sep - Mon, 22 Sep
SEA
Seattle
SJC
San Jose
HK$1,599 Return, found 2 days ago
HK$1,599
Return
found 2 days ago
Select American Airlines flight, departing Thu, 18 Sep from Seattle to San Jose, returning Mon, 22 Sep, priced at HK$1,599 found 2 days ago
Hawaiian Airlines
Fri, 1 Aug - Thu, 14 Aug
PAE
Seattle
SFO
San Francisco
HK$2,801 Return, found 5 days ago
HK$2,801
Return
found 5 days ago
Select Hawaiian Airlines flight, departing Fri, 1 Aug from Seattle to San Francisco, returning Thu, 14 Aug, priced at HK$2,801 found 5 days ago
Alaska Airlines
Thu, 18 Sep - Mon, 22 Sep
PAE
Seattle
SJC
San Jose
HK$4,804 Return, found 2 days ago
HK$4,804
Return
found 2 days ago
Select Alaska Airlines flight, departing Thu, 18 Sep from Seattle to San Jose, returning Mon, 22 Sep, priced at HK$4,804 found 2 days ago

Find the cheapest month to fly from Seattle (SEA) to San Jose (SJC)

September is typically the cheapest month to fly

From HK$527 - HK$1,150 per traveller.

Graph displaying average flight prices per month

*Available to Expedia members.