$577 Cheap United flights San Diego (SAN) to Porto (OPO)

View $577 flight on Mon, Aug 31, 2026Opens in a new window

$577 Cheap United flights San Diego (SAN) to Porto (OPO)

Prices were available within the past 7 days and start at $577 for one-way flights and $892 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Mon, Aug 31 - Tue, Sep 8
SAN
San Diego
OPO
Porto
$892 Roundtrip, found 11 hours ago
$892
Roundtrip
found 11 hours ago
Select United flight, departing Mon, Aug 31 from San Diego to Porto, returning Tue, Sep 8, priced at $892 found 11 hours ago
United
Mon, Aug 31 - Tue, Sep 8
SAN
San Diego
OPO
Porto
$894 Roundtrip, found 11 hours ago
$894
Roundtrip
found 11 hours ago
Select United flight, departing Mon, Aug 31 from San Diego to Porto, returning Tue, Sep 8, priced at $894 found 11 hours ago
United
Mon, Aug 31 - Tue, Sep 8
SAN
San Diego
OPO
Porto
$1,000 Roundtrip, found 11 hours ago
$1,000
Roundtrip
found 11 hours ago
Select United flight, departing Mon, Aug 31 from San Diego to Porto, returning Tue, Sep 8, priced at $1,000 found 11 hours ago
United
Mon, Aug 31 - Tue, Sep 8
SAN
San Diego
OPO
Porto
$1,000 Roundtrip, found 11 hours ago
$1,000
Roundtrip
found 11 hours ago
Select United flight, departing Mon, Aug 31 from San Diego to Porto, returning Tue, Sep 8, priced at $1,000 found 11 hours ago
United
Mon, Aug 31 - Tue, Sep 8
SAN
San Diego
OPO
Porto
$1,002 Roundtrip, found 11 hours ago
$1,002
Roundtrip
found 11 hours ago
Select United flight, departing Mon, Aug 31 from San Diego to Porto, returning Tue, Sep 8, priced at $1,002 found 11 hours ago
United
Mon, Aug 31 - Tue, Sep 8
SAN
San Diego
OPO
Porto
$1,007 Roundtrip, found 11 hours ago
$1,007
Roundtrip
found 11 hours ago
Select United flight, departing Mon, Aug 31 from San Diego to Porto, returning Tue, Sep 8, priced at $1,007 found 11 hours ago
United
Mon, Aug 31 - Tue, Sep 8
SAN
San Diego
OPO
Porto
$1,008 Roundtrip, found 11 hours ago
$1,008
Roundtrip
found 11 hours ago
Select United flight, departing Mon, Aug 31 from San Diego to Porto, returning Tue, Sep 8, priced at $1,008 found 11 hours ago
United
Mon, Aug 31 - Tue, Sep 8
SAN
San Diego
OPO
Porto
$1,009 Roundtrip, found 11 hours ago
$1,009
Roundtrip
found 11 hours ago
Select United flight, departing Mon, Aug 31 from San Diego to Porto, returning Tue, Sep 8, priced at $1,009 found 11 hours ago

Find the cheapest month to fly from San Diego (SAN) to Porto (OPO)

January is typically the cheapest month to fly

From $475 - $1,596 per traveler.

Travel information

Origin airport
San Diego Intl.
Destination airport
Dr. Francisco de Sa Carneiro
Airlines serving
Air Canada, Air France, American Airlines, British Airways, Delta, Iberia, KLM, Lufthansa, Swiss International Air Lines, United
Popular airline
Air France
Distance
8960 km

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