United Flight UA3639 Deals & Information (2025/2026)

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United Flight 3639 Route Deals From $145

The cheapest prices found with in the last 7 days for return flights were $236 and $145 for one-way flights to Newark Liberty Intl. Airport for the period specified. Prices and availability are subject to change. Additional terms apply.

Tue, Sep 23 - Sun, Sep 28
MCI
Kansas City Intl.
EWR
Newark Liberty Intl. Airport
$236 Roundtrip, found 2 days ago
$236
Roundtrip
found 2 days ago
Select United flight, departing Tue, Sep 23 from Kansas City Intl. to Newark Liberty Intl. Airport, returning Sun, Sep 28, priced at $236 found 2 days ago
Wed, Nov 5 - Wed, Nov 12
MCI
Kansas City Intl.
EWR
Newark Liberty Intl. Airport
$237 Roundtrip, found 2 days ago
$237
Roundtrip
found 2 days ago
Select United flight, departing Wed, Nov 5 from Kansas City Intl. to Newark Liberty Intl. Airport, returning Wed, Nov 12, priced at $237 found 2 days ago
Tue, Sep 23 - Sun, Sep 28
MCI
Kansas City Intl.
EWR
Newark Liberty Intl. Airport
$246 Roundtrip, found 2 days ago
$246
Roundtrip
found 2 days ago
Select United flight, departing Tue, Sep 23 from Kansas City Intl. to Newark Liberty Intl. Airport, returning Sun, Sep 28, priced at $246 found 2 days ago
Tue, Sep 23 - Sat, Sep 27
MCI
Kansas City Intl.
EWR
Newark Liberty Intl. Airport
$250 Roundtrip, found 3 days ago
$250
Roundtrip
found 3 days ago
Select United flight, departing Tue, Sep 23 from Kansas City Intl. to Newark Liberty Intl. Airport, returning Sat, Sep 27, priced at $250 found 3 days ago
Wed, Nov 5 - Wed, Nov 12
MCI
Kansas City Intl.
EWR
Newark Liberty Intl. Airport
$259 Roundtrip, found 2 days ago
$259
Roundtrip
found 2 days ago
Select United flight, departing Wed, Nov 5 from Kansas City Intl. to Newark Liberty Intl. Airport, returning Wed, Nov 12, priced at $259 found 2 days ago
Wed, Sep 10 - Fri, Sep 12
MCI
Kansas City Intl.
EWR
Newark Liberty Intl. Airport
$261 Roundtrip, found 1 day ago
$261
Roundtrip
found 1 day ago
Select United flight, departing Wed, Sep 10 from Kansas City Intl. to Newark Liberty Intl. Airport, returning Fri, Sep 12, priced at $261 found 1 day ago

Frequently asked questions

What route does flight number UA3639 take?
Flight number UA3639 flies directly from ORD to BUF. During this trip, expect to be in the air for about 1 hour and 33 minutes. It pays to book ahead to secure your favorite seat.
What terminal does UA3639 fly out of?
Flight number UA3639 runs between ORD and Buffalo Niagara International Airport, and travelers with a seat on this flight usually board the aircraft from Terminal 2.
What kind of plane is on flight number UA3639?
The route for UA3639 is usually O'Hare Airport to Buffalo Niagara Intl. Airport (BUF), and the Embraer 170 is the type of aircraft you're likely to be flying with.
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 UA3639 flight with Travelocity, please visit our Customer Service Portal.