United Flight UA3521 Deals & Information (2025/2026)

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United Flight 3521 Route Deals From $57

The cheapest prices found with in the last 7 days for return flights were $111 and $57 for one-way flights to Newark Liberty Intl. Airport for the period specified. Prices and availability are subject to change. Additional terms apply.

Thu, Sep 25 - Mon, Sep 29
PWM
Portland Intl. Jetport
EWR
Newark Liberty Intl. Airport
$111 Roundtrip, found 2 days ago
$111
Roundtrip
found 2 days ago
Select United flight, departing Thu, Sep 25 from Portland Intl. Jetport to Newark Liberty Intl. Airport, returning Mon, Sep 29, priced at $111 found 2 days ago
Wed, Aug 27 - Wed, Sep 3
PWM
Portland Intl. Jetport
EWR
Newark Liberty Intl. Airport
$113 Roundtrip, found 18 hours ago
$113
Roundtrip
found 18 hours ago
Select United flight, departing Wed, Aug 27 from Portland Intl. Jetport to Newark Liberty Intl. Airport, returning Wed, Sep 3, priced at $113 found 18 hours ago
Wed, Sep 24 - Sat, Sep 27
PWM
Portland Intl. Jetport
EWR
Newark Liberty Intl. Airport
$117 Roundtrip, found 3 days ago
$117
Roundtrip
found 3 days ago
Select United flight, departing Wed, Sep 24 from Portland Intl. Jetport to Newark Liberty Intl. Airport, returning Sat, Sep 27, priced at $117 found 3 days ago
Thu, Oct 23 - Sun, Oct 26
PWM
Portland Intl. Jetport
EWR
Newark Liberty Intl. Airport
$124 Roundtrip, found 1 day ago
$124
Roundtrip
found 1 day ago
Select United flight, departing Thu, Oct 23 from Portland Intl. Jetport to Newark Liberty Intl. Airport, returning Sun, Oct 26, priced at $124 found 1 day ago
Tue, Aug 26 - Wed, Aug 27
PWM
Portland Intl. Jetport
EWR
Newark Liberty Intl. Airport
$126 Roundtrip, found 1 day ago
$126
Roundtrip
found 1 day ago
Select United flight, departing Tue, Aug 26 from Portland Intl. Jetport to Newark Liberty Intl. Airport, returning Wed, Aug 27, priced at $126 found 1 day ago
Wed, Sep 24 - Sat, Sep 27
PWM
Portland Intl. Jetport
EWR
Newark Liberty Intl. Airport
$127 Roundtrip, found 3 days ago
$127
Roundtrip
found 3 days ago
Select United flight, departing Wed, Sep 24 from Portland Intl. Jetport to Newark Liberty Intl. Airport, returning Sat, Sep 27, priced at $127 found 3 days ago
Fri, Oct 31 - Mon, Nov 3
PWM
Portland Intl. Jetport
EWR
Newark Liberty Intl. Airport
$137 Roundtrip, found 4 hours ago
$137
Roundtrip
found 4 hours ago
Select United flight, departing Fri, Oct 31 from Portland Intl. Jetport to Newark Liberty Intl. Airport, returning Mon, Nov 3, priced at $137 found 4 hours ago
Wed, Sep 24 - Sat, Sep 27
PWM
Portland Intl. Jetport
EWR
Newark Liberty Intl. Airport
$145 Roundtrip, found 3 days ago
$145
Roundtrip
found 3 days ago
Select United flight, departing Wed, Sep 24 from Portland Intl. Jetport to Newark Liberty Intl. Airport, returning Sat, Sep 27, priced at $145 found 3 days ago
Wed, Aug 13 - Thu, Aug 14
PWM
Portland Intl. Jetport
EWR
Newark Liberty Intl. Airport
$147 Roundtrip, found 4 days ago
$147
Roundtrip
found 4 days ago
Select United flight, departing Wed, Aug 13 from Portland Intl. Jetport to Newark Liberty Intl. Airport, returning Thu, Aug 14, priced at $147 found 4 days ago
Fri, Oct 17 - Sat, Oct 18
PWM
Portland Intl. Jetport
EWR
Newark Liberty Intl. Airport
$148 Roundtrip, found 2 days ago
$148
Roundtrip
found 2 days ago
Select United flight, departing Fri, Oct 17 from Portland Intl. Jetport to Newark Liberty Intl. Airport, returning Sat, Oct 18, priced at $148 found 2 days 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.