United Flight 1998 Deals & Information (2025/2026)

Wander Wisely with exceptional service, 24/7 supportOpens in a new window

Feel at ease with free flight cancellations within 24 hours of booking

Change your flight without a fee on select flights

United Flight 1998 Route Deals From $50

The cheapest prices found with in the last 7 days for return flights were $77 and $50 for one-way flights to San Francisco Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Mon, Oct 6 - Tue, Oct 7
PDX
Portland Intl.
SFO
San Francisco Intl.
$77 Roundtrip, found 10 hours ago
$77
Roundtrip
found 10 hours ago
Select United flight, departing Mon, Oct 6 from Portland Intl. to San Francisco Intl., returning Tue, Oct 7, priced at $77 found 10 hours ago
Sat, Oct 18 - Wed, Oct 22
PDX
Portland Intl.
SFO
San Francisco Intl.
$94 Roundtrip, found 4 days ago
$94
Roundtrip
found 4 days ago
Select United flight, departing Sat, Oct 18 from Portland Intl. to San Francisco Intl., returning Wed, Oct 22, priced at $94 found 4 days ago
Mon, Oct 6 - Tue, Oct 7
PDX
Portland Intl.
SFO
San Francisco Intl.
$99 Roundtrip, found 10 hours ago
$99
Roundtrip
found 10 hours ago
Select United flight, departing Mon, Oct 6 from Portland Intl. to San Francisco Intl., returning Tue, Oct 7, priced at $99 found 10 hours ago
Mon, Oct 6 - Tue, Oct 7
PDX
Portland Intl.
SFO
San Francisco Intl.
$107 Roundtrip, found 10 hours ago
$107
Roundtrip
found 10 hours ago
Select United flight, departing Mon, Oct 6 from Portland Intl. to San Francisco Intl., returning Tue, Oct 7, priced at $107 found 10 hours ago
Mon, Oct 6 - Tue, Oct 7
PDX
Portland Intl.
SFO
San Francisco Intl.
$108 Roundtrip, found 10 hours ago
$108
Roundtrip
found 10 hours ago
Select United flight, departing Mon, Oct 6 from Portland Intl. to San Francisco Intl., returning Tue, Oct 7, priced at $108 found 10 hours ago
Sat, Aug 30 - Wed, Sep 3
PDX
Portland Intl.
SFO
San Francisco Intl.
$120 Roundtrip, found 4 days ago
$120
Roundtrip
found 4 days ago
Select United flight, departing Sat, Aug 30 from Portland Intl. to San Francisco Intl., returning Wed, Sep 3, priced at $120 found 4 days ago
Wed, Oct 8 - Wed, Oct 15
PDX
Portland Intl.
SFO
San Francisco Intl.
$127 Roundtrip, found 15 hours ago
$127
Roundtrip
found 15 hours ago
Select United flight, departing Wed, Oct 8 from Portland Intl. to San Francisco Intl., returning Wed, Oct 15, priced at $127 found 15 hours ago
Thu, Aug 28 - Sun, Aug 31
PDX
Portland Intl.
SFO
San Francisco Intl.
$127 Roundtrip, found 6 hours ago
$127
Roundtrip
found 6 hours ago
Select United flight, departing Thu, Aug 28 from Portland Intl. to San Francisco Intl., returning Sun, Aug 31, priced at $127 found 6 hours ago
Tue, Oct 7 - Tue, Oct 14
PDX
Portland Intl.
SFO
San Francisco Intl.
$129 Roundtrip, found 4 days ago
$129
Roundtrip
found 4 days ago
Select United flight, departing Tue, Oct 7 from Portland Intl. to San Francisco Intl., returning Tue, Oct 14, priced at $129 found 4 days ago
Wed, Oct 8 - Wed, Oct 15
PDX
Portland Intl.
SFO
San Francisco Intl.
$130 Roundtrip, found 15 hours ago
$130
Roundtrip
found 15 hours ago
Select United flight, departing Wed, Oct 8 from Portland Intl. to San Francisco Intl., returning Wed, Oct 15, priced at $130 found 15 hours ago
Tue, Sep 23 - Tue, Sep 30
PDX
Portland Intl.
SFO
San Francisco Intl.
$133 Roundtrip, found 1 day ago
$133
Roundtrip
found 1 day ago
Select United flight, departing Tue, Sep 23 from Portland Intl. to San Francisco Intl., returning Tue, Sep 30, priced at $133 found 1 day ago
Mon, Oct 6 - Tue, Oct 7
PDX
Portland Intl.
SFO
San Francisco Intl.
$134 Roundtrip, found 10 hours ago
$134
Roundtrip
found 10 hours ago
Select United flight, departing Mon, Oct 6 from Portland Intl. to San Francisco Intl., returning Tue, Oct 7, priced at $134 found 10 hours ago