United Flight 639 Deals & Information (2026/2027)

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United Flight 639 Route Deals From $117

The cheapest prices found with in the last 7 days for return flights were $221 and $117 for one-way flights to Los Angeles Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Sat, May 2 - Tue, May 5
BOS
Logan Intl.
LAX
Los Angeles Intl.
$221 Roundtrip, found 12 hours ago
$221
Roundtrip
found 12 hours ago
Select United flight, departing Sat, May 2 from Logan Intl. to Los Angeles Intl., returning Tue, May 5, priced at $221 found 12 hours ago
Tue, Sep 8 - Tue, Sep 22
BOS
Logan Intl.
LAX
Los Angeles Intl.
$227 Roundtrip, found 2 hours ago
$227
Roundtrip
found 2 hours ago
Select United flight, departing Tue, Sep 8 from Logan Intl. to Los Angeles Intl., returning Tue, Sep 22, priced at $227 found 2 hours ago
Sat, May 2 - Tue, May 5
BOS
Logan Intl.
LAX
Los Angeles Intl.
$231 Roundtrip, found 12 hours ago
$231
Roundtrip
found 12 hours ago
Select United flight, departing Sat, May 2 from Logan Intl. to Los Angeles Intl., returning Tue, May 5, priced at $231 found 12 hours ago
Tue, Sep 8 - Tue, Sep 22
BOS
Logan Intl.
LAX
Los Angeles Intl.
$232 Roundtrip, found 2 hours ago
$232
Roundtrip
found 2 hours ago
Select United flight, departing Tue, Sep 8 from Logan Intl. to Los Angeles Intl., returning Tue, Sep 22, priced at $232 found 2 hours ago

Frequently asked questions

What route does flight number UA639 take?
UA639 takes a number of routes. The most popular is PBI to Liberty Intl. Airport (EWR), which is a direct flight. This flight takes roughly 2 hours and 43 minutes. However, there may be other flights with this number that have one or more stops.
What kind of plane is on flight number UA639?
UA639 is a flight number that is used on many different routes. If you have a ticket on the most popular one, West Palm Beach, FL Airport (PBI-Palm Beach Intl.) to EWR, there's a good chance you'll be on the Boeing 737-900.
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 UA639 flight with Travelocity, please visit our Customer Service Portal.