Cheap flights from Porto to Treasure Island

View AU$818 flight on Tue, 30 Sep. 2025Opens in a new window

Popular airlines from Porto to Treasure Island

  • Plan, book, fly with confidence

  • trending down icon

    Be in the know

    Get alerts if flight prices drop or rise*
  • bex rewards loyalty icon

    Book smarter

    Save up to 35% on select hotels after you book a flight*
  • payments icon

    Earn twice

    Earn your airline miles on top of our rewards
    Sign in

Cheap Flights from Porto (OPO) to Treasure Island (SJC)

Prices were available within the past 7 days for one-way flights and round trip tickets for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Mon, 8 Sep. - Tue, 16 Sep.
OPO
Porto
SFO
San Francisco
AU$1,181 Return, found 4 days ago
AU$1,181
Return
found 4 days ago
Select United flight, departing Mon, 8 Sep. from Porto to San Francisco, returning Tue, 16 Sep., priced at AU$1,181 found 4 days ago
Delta
Mon, 8 Sep. - Tue, 16 Sep.
OPO
Porto
SFO
San Francisco
AU$1,200 Return, found 4 days ago
AU$1,200
Return
found 4 days ago
Select Delta flight, departing Mon, 8 Sep. from Porto to San Francisco, returning Tue, 16 Sep., priced at AU$1,200 found 4 days ago
American Airlines
Mon, 8 Sep. - Tue, 16 Sep.
OPO
Porto
SFO
San Francisco
AU$1,207 Return, found 4 days ago
AU$1,207
Return
found 4 days ago
Select American Airlines flight, departing Mon, 8 Sep. from Porto to San Francisco, returning Tue, 16 Sep., priced at AU$1,207 found 4 days ago
Swiss International Air Lines
Mon, 8 Sep. - Tue, 16 Sep.
OPO
Porto
SFO
San Francisco
AU$1,224 Return, found 4 days ago
AU$1,224
Return
found 4 days ago
Select Swiss International Air Lines flight, departing Mon, 8 Sep. from Porto to San Francisco, returning Tue, 16 Sep., priced at AU$1,224 found 4 days ago
Lufthansa
Mon, 8 Sep. - Tue, 16 Sep.
OPO
Porto
SFO
San Francisco
AU$1,278 Return, found 4 days ago
AU$1,278
Return
found 4 days ago
Select Lufthansa flight, departing Mon, 8 Sep. from Porto to San Francisco, returning Tue, 16 Sep., priced at AU$1,278 found 4 days ago
Brussels Airlines
Mon, 8 Sep. - Tue, 16 Sep.
OPO
Porto
SFO
San Francisco
AU$1,286 Return, found 4 days ago
AU$1,286
Return
found 4 days ago
Select Brussels Airlines flight, departing Mon, 8 Sep. from Porto to San Francisco, returning Tue, 16 Sep., priced at AU$1,286 found 4 days ago

Find the cheapest month to fly from Porto (OPO) to San Francisco (SFO)

February is typically the cheapest month to fly

From AU$884 - AU$1,377 per traveller.

Graph displaying average flight prices per month

*Available to Expedia members.