United Flight UA3521 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.

Wed, Dec 10 - Sun, Dec 14
GSP
Greenville-Spartanburg Intl.
EWR
Newark Liberty Intl. Airport
$209 Roundtrip, found 1 day ago
$209
Roundtrip
found 1 day ago
Select United flight, departing Wed, Dec 10 from Greenville-Spartanburg Intl. to Newark Liberty Intl. Airport, returning Sun, Dec 14, priced at $209 found 1 day ago
Thu, Nov 13 - Sun, Nov 16
GSP
Greenville-Spartanburg Intl.
EWR
Newark Liberty Intl. Airport
$213 Roundtrip, found 1 day ago
$213
Roundtrip
found 1 day 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 1 day ago
Thu, Jan 22 - Sun, Jan 25
GSP
Greenville-Spartanburg Intl.
EWR
Newark Liberty Intl. Airport
$219 Roundtrip, found 3 days ago
$219
Roundtrip
found 3 days ago
Select United flight, departing Thu, Jan 22 from Greenville-Spartanburg Intl. to Newark Liberty Intl. Airport, returning Sun, Jan 25, priced at $219 found 3 days ago
Tue, Oct 7 - Wed, Oct 22
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, Oct 7 from Greenville-Spartanburg Intl. to Newark Liberty Intl. Airport, returning Wed, Oct 22, priced at $222 found 6 days ago
Tue, Nov 18 - Sun, Nov 23
GSP
Greenville-Spartanburg Intl.
EWR
Newark Liberty Intl. Airport
$222 Roundtrip, found 3 days ago
$222
Roundtrip
found 3 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 3 days ago
Tue, Oct 14 - Sun, Oct 19
GSP
Greenville-Spartanburg Intl.
EWR
Newark Liberty Intl. Airport
$240 Roundtrip, found 2 days ago
$240
Roundtrip
found 2 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 2 days ago
Fri, Oct 17 - Mon, Oct 20
GSP
Greenville-Spartanburg Intl.
EWR
Newark Liberty Intl. Airport
$243 Roundtrip, found 1 day ago
$243
Roundtrip
found 1 day ago
Select United flight, departing Fri, Oct 17 from Greenville-Spartanburg Intl. to Newark Liberty Intl. Airport, returning Mon, Oct 20, priced at $243 found 1 day ago
Fri, Oct 17 - Sun, Oct 19
GSP
Greenville-Spartanburg Intl.
EWR
Newark Liberty Intl. Airport
$252 Roundtrip, found 1 day ago
$252
Roundtrip
found 1 day ago
Select United flight, departing Fri, Oct 17 from Greenville-Spartanburg Intl. to Newark Liberty Intl. Airport, returning Sun, Oct 19, priced at $252 found 1 day ago
Thu, Oct 9 - Mon, Oct 13
GSP
Greenville-Spartanburg Intl.
EWR
Newark Liberty Intl. Airport
$255 Roundtrip, found 6 days ago
$255
Roundtrip
found 6 days ago
Select United flight, departing Thu, Oct 9 from Greenville-Spartanburg Intl. to Newark Liberty Intl. Airport, returning Mon, Oct 13, priced at $255 found 6 days ago
Thu, Oct 9 - Sun, Oct 12
GSP
Greenville-Spartanburg Intl.
EWR
Newark Liberty Intl. Airport
$263 Roundtrip, found 22 hours ago
$263
Roundtrip
found 22 hours ago
Select United flight, departing Thu, Oct 9 from Greenville-Spartanburg Intl. to Newark Liberty Intl. Airport, returning Sun, Oct 12, priced at $263 found 22 hours ago
Fri, Oct 17 - Sun, Oct 19
GSP
Greenville-Spartanburg Intl.
EWR
Newark Liberty Intl. Airport
$273 Roundtrip, found 1 day ago
$273
Roundtrip
found 1 day ago
Select United flight, departing Fri, Oct 17 from Greenville-Spartanburg Intl. to Newark Liberty Intl. Airport, returning Sun, Oct 19, priced at $273 found 1 day ago
Sat, Oct 11 - Tue, Oct 14
GSP
Greenville-Spartanburg Intl.
EWR
Newark Liberty Intl. Airport
$278 Roundtrip, found 4 hours ago
$278
Roundtrip
found 4 hours ago
Select United flight, departing Sat, Oct 11 from Greenville-Spartanburg Intl. to Newark Liberty Intl. Airport, returning Tue, Oct 14, priced at $278 found 4 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.