United Flight UA646 Deals & Information (2025/2026)

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United Flight 646 Route Deals From $177

The cheapest prices found with in the last 7 days for return flights were $289 and $177 for one-way flights to Ponciano Arriaga Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Thu, Jul 31 - Tue, Aug 12
IAH
George Bush Intercontinental
SLP
Ponciano Arriaga Intl.
$289 Roundtrip, found 2 days ago
$289
Roundtrip
found 2 days ago
Select United flight, departing Thu, Jul 31 from George Bush Intercontinental to Ponciano Arriaga Intl., returning Tue, Aug 12, priced at $289 found 2 days ago
Wed, Mar 11 - Sat, Mar 14
IAH
George Bush Intercontinental
SLP
Ponciano Arriaga Intl.
$335 Roundtrip, found 3 days ago
$335
Roundtrip
found 3 days ago
Select United flight, departing Wed, Mar 11 from George Bush Intercontinental to Ponciano Arriaga Intl., returning Sat, Mar 14, priced at $335 found 3 days ago
Mon, Sep 22 - Fri, Sep 26
IAH
George Bush Intercontinental
SLP
Ponciano Arriaga Intl.
$387 Roundtrip, found 1 day ago
$387
Roundtrip
found 1 day ago
Select United flight, departing Mon, Sep 22 from George Bush Intercontinental to Ponciano Arriaga Intl., returning Fri, Sep 26, priced at $387 found 1 day ago

Frequently asked questions

What route does flight number UA646 take?
UA646 flies directly between Salt Lake City, UT Airport (SLC-Salt Lake City Intl.) and Houston, TX Airport (IAH-George Bush Intercontinental) in roughly 2 hours and 58 minutes. It can sometimes be used on other routes though, some of which could be multi-stop journeys. Keep an eye out for this when locking in your airfare to avoid any mix-ups.
What kind of plane is on flight number UA646?
It's likely you'll be heading off on a Boeing 737-800 if you're flying from Salt Lake City Intl. Airport to George Bush Intercontinental Airport (IAH), the most popular route for flight UA646.
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 UA646 flight with Travelocity, please visit our Customer Service Portal.