Cheap flights from San Francisco to Aliados

View AU$613 flight on Mon, 18 Aug. 2025Opens in a new window

Popular airlines from San Francisco to Aliados

  • 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 San Francisco (SJC) to Aliados (OPO)

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.

TAP Portugal
Thu, 18 Sep. - Tue, 30 Sep.
SFO
San Francisco
OPO
Porto
AU$999 Return, found 4 days ago
AU$999
Return
found 4 days ago
Select TAP Portugal flight, departing Thu, 18 Sep. from San Francisco to Porto, returning Tue, 30 Sep., priced at AU$999 found 4 days ago
United
Mon, 18 Aug. - Tue, 2 Sep.
SFO
San Francisco
OPO
Porto
AU$1,118 Return, found 1 day ago
AU$1,118
Return
found 1 day ago
Select United flight, departing Mon, 18 Aug. from San Francisco to Porto, returning Tue, 2 Sep., priced at AU$1,118 found 1 day ago
Air Canada
Mon, 18 Aug. - Tue, 2 Sep.
SFO
San Francisco
OPO
Porto
AU$1,118 Return, found 1 day ago
AU$1,118
Return
found 1 day ago
Select Air Canada flight, departing Mon, 18 Aug. from San Francisco to Porto, returning Tue, 2 Sep., priced at AU$1,118 found 1 day ago
Swiss International Air Lines
Mon, 18 Aug. - Tue, 2 Sep.
SFO
San Francisco
OPO
Porto
AU$1,184 Return, found 1 day ago
AU$1,184
Return
found 1 day ago
Select Swiss International Air Lines flight, departing Mon, 18 Aug. from San Francisco to Porto, returning Tue, 2 Sep., priced at AU$1,184 found 1 day ago
British Airways
Thu, 18 Sep. - Tue, 30 Sep.
SFO
San Francisco
OPO
Porto
AU$1,371 Return, found 4 days ago
AU$1,371
Return
found 4 days ago
Select British Airways flight, departing Thu, 18 Sep. from San Francisco to Porto, returning Tue, 30 Sep., priced at AU$1,371 found 4 days ago
Delta
Mon, 18 Aug. - Tue, 2 Sep.
SFO
San Francisco
OPO
Porto
AU$1,377 Return, found 1 day ago
AU$1,377
Return
found 1 day ago
Select Delta flight, departing Mon, 18 Aug. from San Francisco to Porto, returning Tue, 2 Sep., priced at AU$1,377 found 1 day ago

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

January is typically the cheapest month to fly

From AU$800 - AU$1,954 per traveller.

Graph displaying average flight prices per month

*Available to Expedia members.