United Flight 3521 Deals & Information (2025/2026)

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United Flight 3521 Route Deals From $224

The cheapest prices found with in the last 7 days for return flights were $209 and $224 for one-way flights to Newark Liberty Intl. Airport for the period specified. Prices and availability are subject to change. Additional terms apply.

Fri, Jan 16 - Tue, Jan 20
GSP
Greenville-Spartanburg Intl.
EWR
Newark Liberty Intl. Airport
$209 Roundtrip, found 2 days ago
$209
Roundtrip
found 2 days ago
Select United flight, departing Fri, Jan 16 from Greenville-Spartanburg Intl. to Newark Liberty Intl. Airport, returning Tue, Jan 20, priced at $209 found 2 days ago
Thu, Nov 13 - Sun, Nov 16
GSP
Greenville-Spartanburg Intl.
EWR
Newark Liberty Intl. Airport
$213 Roundtrip, found 4 days ago
$213
Roundtrip
found 4 days ago
Select United flight, departing Thu, Nov 13 from Greenville-Spartanburg Intl. to Newark Liberty Intl. Airport, returning Sun, Nov 16, priced at $213 found 4 days ago
Sat, Jan 24 - Tue, Jan 27
GSP
Greenville-Spartanburg Intl.
EWR
Newark Liberty Intl. Airport
$214 Roundtrip, found 1 day ago
$214
Roundtrip
found 1 day ago
Select United flight, departing Sat, Jan 24 from Greenville-Spartanburg Intl. to Newark Liberty Intl. Airport, returning Tue, Jan 27, priced at $214 found 1 day ago
Fri, Jan 16 - Tue, Jan 20
GSP
Greenville-Spartanburg Intl.
EWR
Newark Liberty Intl. Airport
$219 Roundtrip, found 2 days ago
$219
Roundtrip
found 2 days ago
Select United flight, departing Fri, Jan 16 from Greenville-Spartanburg Intl. to Newark Liberty Intl. Airport, returning Tue, Jan 20, priced at $219 found 2 days ago
Tue, Nov 18 - Sun, Nov 23
GSP
Greenville-Spartanburg Intl.
EWR
Newark Liberty Intl. Airport
$222 Roundtrip, found 6 days ago
$222
Roundtrip
found 6 days ago
Select United flight, departing Tue, Nov 18 from Greenville-Spartanburg Intl. to Newark Liberty Intl. Airport, returning Sun, Nov 23, priced at $222 found 6 days ago
Sat, Jan 24 - Tue, Jan 27
GSP
Greenville-Spartanburg Intl.
EWR
Newark Liberty Intl. Airport
$224 Roundtrip, found 1 day ago
$224
Roundtrip
found 1 day ago
Select United flight, departing Sat, Jan 24 from Greenville-Spartanburg Intl. to Newark Liberty Intl. Airport, returning Tue, Jan 27, priced at $224 found 1 day ago
Fri, Oct 17 - Mon, Oct 20
GSP
Greenville-Spartanburg Intl.
EWR
Newark Liberty Intl. Airport
$229 Roundtrip, found 3 hours ago
$229
Roundtrip
found 3 hours ago
Select United flight, departing Fri, Oct 17 from Greenville-Spartanburg Intl. to Newark Liberty Intl. Airport, returning Mon, Oct 20, priced at $229 found 3 hours ago
Tue, Oct 14 - Sun, Oct 19
GSP
Greenville-Spartanburg Intl.
EWR
Newark Liberty Intl. Airport
$240 Roundtrip, found 5 days ago
$240
Roundtrip
found 5 days ago
Select United flight, departing Tue, Oct 14 from Greenville-Spartanburg Intl. to Newark Liberty Intl. Airport, returning Sun, Oct 19, priced at $240 found 5 days ago
Sat, Oct 25 - Mon, Oct 27
GSP
Greenville-Spartanburg Intl.
EWR
Newark Liberty Intl. Airport
$241 Roundtrip, found 16 hours ago
$241
Roundtrip
found 16 hours ago
Select United flight, departing Sat, Oct 25 from Greenville-Spartanburg Intl. to Newark Liberty Intl. Airport, returning Mon, Oct 27, priced at $241 found 16 hours ago
Sat, Oct 18 - Sun, Oct 19
GSP
Greenville-Spartanburg Intl.
EWR
Newark Liberty Intl. Airport
$243 Roundtrip, found 18 hours ago
$243
Roundtrip
found 18 hours ago
Select United flight, departing Sat, Oct 18 from Greenville-Spartanburg Intl. to Newark Liberty Intl. Airport, returning Sun, Oct 19, priced at $243 found 18 hours ago

Frequently asked questions

What route does flight number UA3521 take?
UA3521 takes multiple routes. The most frequently flown is Chicago, IL Airport (ORD-O'Hare Intl.) to SAT, which is a direct flight. This flight takes roughly 3 hours and 4 minutes. However, you might find other flights with the same number that have one or more stops.
What terminal does UA3521 fly out of?
You'll probably board the plane from Terminal 2 if you're flying from O'Hare Airport. UA3521 serves a number of routes, but the direct flight between Chicago, IL Airport (ORD-O'Hare Intl.) and San Antonio Airport is the most popular one.
What kind of plane is on flight number UA3521?
If you're booked on flight UA3521 from Chicago, IL Airport (ORD-O'Hare Intl.) to San Antonio Airport, you'll likely be heading off on the Embraer 170. Flight UA3521 serves several routes, but this is the most popular.
If I am not able to travel due to COVID-19, can I change my flight to a later date?
For more info about changing your UA3521 flight with Travelocity, please visit our Customer Service Portal.