Porto (OPO) to San Francisco (SFO) flight deal in economy from $669

Air CanadaACAir CanadaLufthansaLHLufthansaSwiss International Air LinesLXSwiss International Air LinesAustrian AirlinesOSAustrian AirlinesUnited AirlinesUAUnited Airlines
Round Trip•Economy
PortugalOPO

Francisco Sá Carneiro Airport

Porto, Portugal
United StatesSFO

San Francisco International Airport

San Francisco, United States
$871 USD
-23%$669 USD
Verified about 11 hours ago
Limited Availability
16% of dates checked are available within 10% of the lowest price

Friday, September 18th, 2026

9 round-trip options

Returning
Wed, Sep 23, 2026•5 Day Trip
$854 USD
Google Flights
Returning
Thu, Sep 24, 2026•6 Day Trip
$869 USD
Google Flights
Returning
Fri, Sep 25, 2026•7 Day Trip
$854 USD
Google Flights
Returning
Sat, Sep 26, 2026•8 Day Trip
$854 USD
Google Flights
Returning
Sun, Sep 27, 2026•9 Day Trip
$783 USD
Google Flights
Returning
Mon, Sep 28, 2026•10 Day Trip
$809 USD
Google Flights
Returning
Tue, Sep 29, 2026•11 Day Trip
$789 USD
Google Flights
Returning
Wed, Sep 30, 2026•12 Day Trip
$818 USD
Google Flights
Returning
Thu, Oct 1, 2026•13 Day Trip
$816 USD
Google Flights