United Flight 631 Deals & Information (2025/2026)

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United Flight 631 Route Deals From $96

The cheapest prices found with in the last 7 days for return flights were $191 and $96 for one-way flights to Newark Liberty Intl. Airport for the period specified. Prices and availability are subject to change. Additional terms apply.

Tue, Feb 17 - Thu, Feb 19
PHX
Sky Harbor Intl.
EWR
Newark Liberty Intl. Airport
$191 Roundtrip, found 4 hours ago
$191
Roundtrip
found 4 hours ago
Select United flight, departing Tue, Feb 17 from Sky Harbor Intl. to Newark Liberty Intl. Airport, returning Thu, Feb 19, priced at $191 found 4 hours ago
Wed, Feb 18 - Fri, Feb 20
PHX
Sky Harbor Intl.
EWR
Newark Liberty Intl. Airport
$201 Roundtrip, found 4 hours ago
$201
Roundtrip
found 4 hours ago
Select United flight, departing Wed, Feb 18 from Sky Harbor Intl. to Newark Liberty Intl. Airport, returning Fri, Feb 20, priced at $201 found 4 hours ago
Wed, Dec 17 - Mon, Jan 12
PHX
Sky Harbor Intl.
EWR
Newark Liberty Intl. Airport
$204 Roundtrip, found 3 days ago
$204
Roundtrip
found 3 days ago
Select United flight, departing Wed, Dec 17 from Sky Harbor Intl. to Newark Liberty Intl. Airport, returning Mon, Jan 12, priced at $204 found 3 days ago
Wed, Feb 18 - Mon, Feb 23
PHX
Sky Harbor Intl.
EWR
Newark Liberty Intl. Airport
$207 Roundtrip, found 1 day ago
$207
Roundtrip
found 1 day ago
Select United flight, departing Wed, Feb 18 from Sky Harbor Intl. to Newark Liberty Intl. Airport, returning Mon, Feb 23, priced at $207 found 1 day ago
Mon, Jan 12 - Wed, Jan 14
PHX
Sky Harbor Intl.
EWR
Newark Liberty Intl. Airport
$212 Roundtrip, found 1 day ago
$212
Roundtrip
found 1 day ago
Select United flight, departing Mon, Jan 12 from Sky Harbor Intl. to Newark Liberty Intl. Airport, returning Wed, Jan 14, priced at $212 found 1 day ago
Fri, Jan 16 - Mon, Jan 19
PHX
Sky Harbor Intl.
EWR
Newark Liberty Intl. Airport
$212 Roundtrip, found 1 day ago
$212
Roundtrip
found 1 day ago
Select United flight, departing Fri, Jan 16 from Sky Harbor Intl. to Newark Liberty Intl. Airport, returning Mon, Jan 19, priced at $212 found 1 day ago
Thu, Jan 8 - Tue, Jan 13
PHX
Sky Harbor Intl.
EWR
Newark Liberty Intl. Airport
$221 Roundtrip, found 4 days ago
$221
Roundtrip
found 4 days ago
Select United flight, departing Thu, Jan 8 from Sky Harbor Intl. to Newark Liberty Intl. Airport, returning Tue, Jan 13, priced at $221 found 4 days ago
Thu, Jan 8 - Sun, Jan 11
PHX
Sky Harbor Intl.
EWR
Newark Liberty Intl. Airport
$222 Roundtrip, found 7 hours ago
$222
Roundtrip
found 7 hours ago
Select United flight, departing Thu, Jan 8 from Sky Harbor Intl. to Newark Liberty Intl. Airport, returning Sun, Jan 11, priced at $222 found 7 hours ago
Wed, Feb 18 - Fri, Feb 20
PHX
Sky Harbor Intl.
EWR
Newark Liberty Intl. Airport
$226 Roundtrip, found 4 hours ago
$226
Roundtrip
found 4 hours ago
Select United flight, departing Wed, Feb 18 from Sky Harbor Intl. to Newark Liberty Intl. Airport, returning Fri, Feb 20, priced at $226 found 4 hours ago
Fri, Dec 12 - Sun, Jan 11
PHX
Sky Harbor Intl.
EWR
Newark Liberty Intl. Airport
$232 Roundtrip, found 17 hours ago
$232
Roundtrip
found 17 hours ago
Select United flight, departing Fri, Dec 12 from Sky Harbor Intl. to Newark Liberty Intl. Airport, returning Sun, Jan 11, priced at $232 found 17 hours ago
Fri, Dec 12 - Sun, Jan 11
PHX
Sky Harbor Intl.
EWR
Newark Liberty Intl. Airport
$237 Roundtrip, found 17 hours ago
$237
Roundtrip
found 17 hours ago
Select United flight, departing Fri, Dec 12 from Sky Harbor Intl. to Newark Liberty Intl. Airport, returning Sun, Jan 11, priced at $237 found 17 hours ago

Frequently asked questions

What route does flight number UA631 take?
UA631 takes roughly 4 hours and 46 minutes to fly directly from Sky Harbor Intl. Airport (PHX) to Liberty Intl. Airport (EWR). We all know there's magic in the destination, but half the fun is in the journey!
How often is UA631 on time?
If you're traveling with United Airlines flight number UA631 from Phoenix, AZ Airport (PHX-Sky Harbor Intl.) to EWR, 84% of these services touch down as scheduled. On the rare occasion that there is a delay, expect a wait time of roughly 36 minutes on average. Thanks to this air carrier's top-quality service, this service has a 2.1-star rating.
What terminal does UA631 fly out of?
Flight number UA631 runs between PHX and EWR, and travelers with a seat on this flight typically depart from Terminal 3.
What kind of plane is on flight number UA631?
The Boeing 737-900 is the aircraft that's mostly used for flight number UA631. This flight nearly always leaves from Sky Harbor Intl. Airport (PHX) and touches down at Newark, NJ Airport (EWR-Liberty Intl.).
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 UA631 flight with Travelocity, please visit our Customer Service Portal.