United Flight UA638 Deals & Information (2025/2026)

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United Flight 638 Route Deals From $164

The cheapest prices found with in the last 7 days for return flights were $328 and $164 for one-way flights to Daniel K. Inouye Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Mon, Sep 29 - Fri, Oct 3
SFO
San Francisco Intl.
HNL
Daniel K. Inouye Intl.
$328 Roundtrip, found 2 hours ago
$328
Roundtrip
found 2 hours ago
Select United flight, departing Mon, Sep 29 from San Francisco Intl. to Daniel K. Inouye Intl., returning Fri, Oct 3, priced at $328 found 2 hours ago
Mon, Sep 29 - Fri, Oct 3
SFO
San Francisco Intl.
HNL
Daniel K. Inouye Intl.
$330 Roundtrip, found 2 hours ago
$330
Roundtrip
found 2 hours ago
Select United flight, departing Mon, Sep 29 from San Francisco Intl. to Daniel K. Inouye Intl., returning Fri, Oct 3, priced at $330 found 2 hours ago
Mon, Nov 17 - Fri, Nov 21
SFO
San Francisco Intl.
HNL
Daniel K. Inouye Intl.
$333 Roundtrip, found 6 days ago
$333
Roundtrip
found 6 days ago
Select United flight, departing Mon, Nov 17 from San Francisco Intl. to Daniel K. Inouye Intl., returning Fri, Nov 21, priced at $333 found 6 days ago
Wed, Oct 22 - Tue, Oct 28
SFO
San Francisco Intl.
HNL
Daniel K. Inouye Intl.
$341 Roundtrip, found 5 days ago
$341
Roundtrip
found 5 days ago
Select United flight, departing Wed, Oct 22 from San Francisco Intl. to Daniel K. Inouye Intl., returning Tue, Oct 28, priced at $341 found 5 days ago
Mon, Nov 17 - Fri, Nov 21
SFO
San Francisco Intl.
HNL
Daniel K. Inouye Intl.
$343 Roundtrip, found 6 days ago
$343
Roundtrip
found 6 days ago
Select United flight, departing Mon, Nov 17 from San Francisco Intl. to Daniel K. Inouye Intl., returning Fri, Nov 21, priced at $343 found 6 days ago
Mon, Sep 29 - Fri, Oct 3
SFO
San Francisco Intl.
HNL
Daniel K. Inouye Intl.
$343 Roundtrip, found 2 hours ago
$343
Roundtrip
found 2 hours ago
Select United flight, departing Mon, Sep 29 from San Francisco Intl. to Daniel K. Inouye Intl., returning Fri, Oct 3, priced at $343 found 2 hours ago
Mon, Sep 29 - Fri, Oct 3
SFO
San Francisco Intl.
HNL
Daniel K. Inouye Intl.
$345 Roundtrip, found 2 hours ago
$345
Roundtrip
found 2 hours ago
Select United flight, departing Mon, Sep 29 from San Francisco Intl. to Daniel K. Inouye Intl., returning Fri, Oct 3, priced at $345 found 2 hours ago
Mon, Oct 27 - Thu, Oct 30
SFO
San Francisco Intl.
HNL
Daniel K. Inouye Intl.
$347 Roundtrip, found 10 hours ago
$347
Roundtrip
found 10 hours ago
Select United flight, departing Mon, Oct 27 from San Francisco Intl. to Daniel K. Inouye Intl., returning Thu, Oct 30, priced at $347 found 10 hours ago
Wed, Oct 8 - Tue, Oct 14
SFO
San Francisco Intl.
HNL
Daniel K. Inouye Intl.
$364 Roundtrip, found 9 hours ago
$364
Roundtrip
found 9 hours ago
Select United flight, departing Wed, Oct 8 from San Francisco Intl. to Daniel K. Inouye Intl., returning Tue, Oct 14, priced at $364 found 9 hours ago
Mon, Nov 10 - Mon, Nov 17
SFO
San Francisco Intl.
HNL
Daniel K. Inouye Intl.
$368 Roundtrip, found 10 hours ago
$368
Roundtrip
found 10 hours ago
Select United flight, departing Mon, Nov 10 from San Francisco Intl. to Daniel K. Inouye Intl., returning Mon, Nov 17, priced at $368 found 10 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.