United Flight 1998 Deals & Information (2025/2026)

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United Flight 1998 Route Deals From $59

The cheapest prices found with in the last 7 days for return flights were $109 and $59 for one-way flights to San Francisco Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Tue, Sep 30 - Thu, Oct 2
PDX
Portland Intl.
SFO
San Francisco Intl.
$109 Roundtrip, found 3 days ago
$109
Roundtrip
found 3 days ago
Select United flight, departing Tue, Sep 30 from Portland Intl. to San Francisco Intl., returning Thu, Oct 2, priced at $109 found 3 days ago
Sat, Dec 13 - Tue, Dec 16
PDX
Portland Intl.
SFO
San Francisco Intl.
$110 Roundtrip, found 4 days ago
$110
Roundtrip
found 4 days ago
Select United flight, departing Sat, Dec 13 from Portland Intl. to San Francisco Intl., returning Tue, Dec 16, priced at $110 found 4 days ago
Tue, Sep 30 - Thu, Oct 2
PDX
Portland Intl.
SFO
San Francisco Intl.
$121 Roundtrip, found 3 days ago
$121
Roundtrip
found 3 days ago
Select United flight, departing Tue, Sep 30 from Portland Intl. to San Francisco Intl., returning Thu, Oct 2, priced at $121 found 3 days ago
Thu, Nov 6 - Thu, Nov 20
PDX
Portland Intl.
SFO
San Francisco Intl.
$124 Roundtrip, found 3 days ago
$124
Roundtrip
found 3 days ago
Select United flight, departing Thu, Nov 6 from Portland Intl. to San Francisco Intl., returning Thu, Nov 20, priced at $124 found 3 days ago
Thu, Nov 6 - Thu, Nov 20
PDX
Portland Intl.
SFO
San Francisco Intl.
$136 Roundtrip, found 3 days ago
$136
Roundtrip
found 3 days ago
Select United flight, departing Thu, Nov 6 from Portland Intl. to San Francisco Intl., returning Thu, Nov 20, priced at $136 found 3 days ago
Tue, Sep 30 - Wed, Oct 1
PDX
Portland Intl.
SFO
San Francisco Intl.
$143 Roundtrip, found 3 days ago
$143
Roundtrip
found 3 days ago
Select United flight, departing Tue, Sep 30 from Portland Intl. to San Francisco Intl., returning Wed, Oct 1, priced at $143 found 3 days ago
Tue, Dec 2 - Tue, Dec 9
PDX
Portland Intl.
SFO
San Francisco Intl.
$149 Roundtrip, just found
$149
Roundtrip
just found
Select United flight, departing Tue, Dec 2 from Portland Intl. to San Francisco Intl., returning Tue, Dec 9, priced at $149 just found