United Flight 638 Deals & Information (2026/2027)

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United Flight 638 Route Deals From $208

The cheapest prices found with in the last 7 days for return flights were $372 and $208 for one-way flights to Daniel K. Inouye Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Tue, May 5 - Thu, May 14
SFO
San Francisco Intl.
HNL
Daniel K. Inouye Intl.
$372 Roundtrip, found 5 days ago
$372
Roundtrip
found 5 days ago
Select United flight, departing Tue, May 5 from San Francisco Intl. to Daniel K. Inouye Intl., returning Thu, May 14, priced at $372 found 5 days ago
Wed, Sep 2 - Wed, Sep 16
SFO
San Francisco Intl.
HNL
Daniel K. Inouye Intl.
$406 Roundtrip, found 23 hours ago
$406
Roundtrip
found 23 hours ago
Select United flight, departing Wed, Sep 2 from San Francisco Intl. to Daniel K. Inouye Intl., returning Wed, Sep 16, priced at $406 found 23 hours ago
Wed, Sep 2 - Wed, Sep 16
SFO
San Francisco Intl.
HNL
Daniel K. Inouye Intl.
$415 Roundtrip, found 23 hours ago
$415
Roundtrip
found 23 hours ago
Select United flight, departing Wed, Sep 2 from San Francisco Intl. to Daniel K. Inouye Intl., returning Wed, Sep 16, priced at $415 found 23 hours ago

Frequently asked questions

What route does flight number UA638 take?
UA638 takes several routes. The most frequently flown is Southwest Florida Intl. Airport to DEN, which flies direct. This service takes around 4 hours and 6 minutes. However, there are likely to be other flights with the same number that have one or more stops.
What kind of plane is on flight number UA638?
There's every chance you'll be taking off on a Boeing 737 MAX 9 if you're going from Southwest Florida Intl. Airport (RSW) to Denver, CO Airport (DEN-Denver Intl.), a common route for flight UA638.
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 UA638 flight with Travelocity, please visit our Customer Service Portal.