United Flight 1639 Deals & Information (2025/2026)

Wander Wisely with exceptional service, 24/7 supportOpens in a new window

Feel at ease with free flight cancellations within 24 hours of booking

Change your flight without a fee on select flights

United Flight 1639 Route Deals From $102

The cheapest prices found with in the last 7 days for return flights were $160 and $102 for one-way flights to Robert's Field for the period specified. Prices and availability are subject to change. Additional terms apply.

Sat, Nov 8 - Tue, Nov 11
SFO
San Francisco Intl.
RDM
Robert's Field
$160 Roundtrip, found 1 day ago
$160
Roundtrip
found 1 day ago
Select United flight, departing Sat, Nov 8 from San Francisco Intl. to Robert's Field, returning Tue, Nov 11, priced at $160 found 1 day ago
Sat, Nov 8 - Mon, Nov 10
SFO
San Francisco Intl.
RDM
Robert's Field
$175 Roundtrip, found 3 days ago
$175
Roundtrip
found 3 days ago
Select United flight, departing Sat, Nov 8 from San Francisco Intl. to Robert's Field, returning Mon, Nov 10, priced at $175 found 3 days ago

Frequently asked questions

What route does flight number UA1639 take?
UA1639 jets from Kahului, HI Airport (OGG) to San Francisco Intl. Airport (SFO) and is a direct flight. This service typically takes 4 hours and 56 minutes.
What kind of plane is on flight number UA1639?
The Boeing 757-200 is the type of plane that's mostly used for flight number UA1639. This flight nearly always departs from Kahului Airport (OGG) and lands at San Francisco Airport.
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 UA1639 flight with Travelocity, please visit our Customer Service Portal.