United Flight 1665 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 1665 Route Deals From $138

The cheapest prices found with in the last 7 days for return flights were $237 and $138 for one-way flights to Logan Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Tue, Sep 16 - Tue, Oct 7
SFO
San Francisco Intl.
BOS
Logan Intl.
$237 Roundtrip, found 1 day ago
$237
Roundtrip
found 1 day ago
Select United flight, departing Tue, Sep 16 from San Francisco Intl. to Logan Intl., returning Tue, Oct 7, priced at $237 found 1 day ago
Tue, Sep 16 - Tue, Oct 7
SFO
San Francisco Intl.
BOS
Logan Intl.
$241 Roundtrip, found 1 day ago
$241
Roundtrip
found 1 day ago
Select United flight, departing Tue, Sep 16 from San Francisco Intl. to Logan Intl., returning Tue, Oct 7, priced at $241 found 1 day ago
Tue, Sep 16 - Tue, Oct 7
SFO
San Francisco Intl.
BOS
Logan Intl.
$247 Roundtrip, found 1 day ago
$247
Roundtrip
found 1 day ago
Select United flight, departing Tue, Sep 16 from San Francisco Intl. to Logan Intl., returning Tue, Oct 7, priced at $247 found 1 day ago
Sat, Oct 25 - Sun, Nov 2
SFO
San Francisco Intl.
BOS
Logan Intl.
$258 Roundtrip, found 4 days ago
$258
Roundtrip
found 4 days ago
Select United flight, departing Sat, Oct 25 from San Francisco Intl. to Logan Intl., returning Sun, Nov 2, priced at $258 found 4 days ago
Tue, Sep 23 - Fri, Oct 10
SFO
San Francisco Intl.
BOS
Logan Intl.
$262 Roundtrip, found 19 hours ago
$262
Roundtrip
found 19 hours ago
Select United flight, departing Tue, Sep 23 from San Francisco Intl. to Logan Intl., returning Fri, Oct 10, priced at $262 found 19 hours ago
Fri, Aug 8 - Sat, Aug 23
SFO
San Francisco Intl.
BOS
Logan Intl.
$263 Roundtrip, found 19 hours ago
$263
Roundtrip
found 19 hours ago
Select United flight, departing Fri, Aug 8 from San Francisco Intl. to Logan Intl., returning Sat, Aug 23, priced at $263 found 19 hours ago
Sun, Sep 21 - Mon, Sep 22
SFO
San Francisco Intl.
BOS
Logan Intl.
$269 Roundtrip, found 11 hours ago
$269
Roundtrip
found 11 hours ago
Select United flight, departing Sun, Sep 21 from San Francisco Intl. to Logan Intl., returning Mon, Sep 22, priced at $269 found 11 hours ago
Tue, Sep 23 - Fri, Oct 10
SFO
San Francisco Intl.
BOS
Logan Intl.
$272 Roundtrip, found 19 hours ago
$272
Roundtrip
found 19 hours ago
Select United flight, departing Tue, Sep 23 from San Francisco Intl. to Logan Intl., returning Fri, Oct 10, priced at $272 found 19 hours ago