United Flight UA3666 Deals & Information (2025/2026)

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United Flight 3666 Route Deals From $105

The cheapest prices found with in the last 7 days for return flights were $209 and $105 for one-way flights to Greenville-Spartanburg Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Thu, Sep 4 - Sun, Sep 7
EWR
Newark Liberty Intl. Airport
GSP
Greenville-Spartanburg Intl.
$209 Roundtrip, found 21 hours ago
$209
Roundtrip
found 21 hours ago
Select United flight, departing Thu, Sep 4 from Newark Liberty Intl. Airport to Greenville-Spartanburg Intl., returning Sun, Sep 7, priced at $209 found 21 hours ago
Thu, Aug 14 - Sat, Aug 16
EWR
Newark Liberty Intl. Airport
GSP
Greenville-Spartanburg Intl.
$213 Roundtrip, found 1 day ago
$213
Roundtrip
found 1 day ago
Select United flight, departing Thu, Aug 14 from Newark Liberty Intl. Airport to Greenville-Spartanburg Intl., returning Sat, Aug 16, priced at $213 found 1 day ago
Thu, Sep 4 - Sun, Sep 7
EWR
Newark Liberty Intl. Airport
GSP
Greenville-Spartanburg Intl.
$219 Roundtrip, found 21 hours ago
$219
Roundtrip
found 21 hours ago
Select United flight, departing Thu, Sep 4 from Newark Liberty Intl. Airport to Greenville-Spartanburg Intl., returning Sun, Sep 7, priced at $219 found 21 hours ago
Wed, Aug 6 - Sun, Aug 10
EWR
Newark Liberty Intl. Airport
GSP
Greenville-Spartanburg Intl.
$223 Roundtrip, found 1 day ago
$223
Roundtrip
found 1 day ago
Select United flight, departing Wed, Aug 6 from Newark Liberty Intl. Airport to Greenville-Spartanburg Intl., returning Sun, Aug 10, priced at $223 found 1 day ago
Thu, Jul 17 - Sun, Jul 20
EWR
Newark Liberty Intl. Airport
GSP
Greenville-Spartanburg Intl.
$223 Roundtrip, found 6 days ago
$223
Roundtrip
found 6 days ago
Select United flight, departing Thu, Jul 17 from Newark Liberty Intl. Airport to Greenville-Spartanburg Intl., returning Sun, Jul 20, priced at $223 found 6 days ago
Wed, Jul 16 - Wed, Jul 23
EWR
Newark Liberty Intl. Airport
GSP
Greenville-Spartanburg Intl.
$225 Roundtrip, found 1 day ago
$225
Roundtrip
found 1 day ago
Select United flight, departing Wed, Jul 16 from Newark Liberty Intl. Airport to Greenville-Spartanburg Intl., returning Wed, Jul 23, priced at $225 found 1 day ago
Wed, Aug 6 - Sun, Aug 10
EWR
Newark Liberty Intl. Airport
GSP
Greenville-Spartanburg Intl.
$233 Roundtrip, found 1 day ago
$233
Roundtrip
found 1 day ago
Select United flight, departing Wed, Aug 6 from Newark Liberty Intl. Airport to Greenville-Spartanburg Intl., returning Sun, Aug 10, priced at $233 found 1 day ago
Thu, Jul 17 - Sun, Jul 20
EWR
Newark Liberty Intl. Airport
GSP
Greenville-Spartanburg Intl.
$233 Roundtrip, found 6 days ago
$233
Roundtrip
found 6 days ago
Select United flight, departing Thu, Jul 17 from Newark Liberty Intl. Airport to Greenville-Spartanburg Intl., returning Sun, Jul 20, priced at $233 found 6 days ago
Wed, Jul 16 - Wed, Jul 23
EWR
Newark Liberty Intl. Airport
GSP
Greenville-Spartanburg Intl.
$235 Roundtrip, found 1 day ago
$235
Roundtrip
found 1 day ago
Select United flight, departing Wed, Jul 16 from Newark Liberty Intl. Airport to Greenville-Spartanburg Intl., returning Wed, Jul 23, priced at $235 found 1 day ago
Wed, Jul 16 - Sat, Jul 19
EWR
Newark Liberty Intl. Airport
GSP
Greenville-Spartanburg Intl.
$235 Roundtrip, found 1 day ago
$235
Roundtrip
found 1 day ago
Select United flight, departing Wed, Jul 16 from Newark Liberty Intl. Airport to Greenville-Spartanburg Intl., returning Sat, Jul 19, priced at $235 found 1 day ago