United Flight 668 Deals & Information (2026/2027)

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 668 Route Deals From $165

The cheapest prices found with in the last 7 days for return flights were $320 and $165 for one-way flights to George Bush Intercontinental for the period specified. Prices and availability are subject to change. Additional terms apply.

Mon, Oct 26 - Tue, Oct 27
SJU
Luis Munoz Marin Intl.
IAH
George Bush Intercontinental
$320 Roundtrip, found 6 hours ago
$320
Roundtrip
found 6 hours ago
Select United flight, departing Mon, Oct 26 from Luis Munoz Marin Intl. to George Bush Intercontinental, returning Tue, Oct 27, priced at $320 found 6 hours ago
Thu, Sep 24 - Mon, Sep 28
SJU
Luis Munoz Marin Intl.
IAH
George Bush Intercontinental
$321 Roundtrip, found 3 hours ago
$321
Roundtrip
found 3 hours ago
Select United flight, departing Thu, Sep 24 from Luis Munoz Marin Intl. to George Bush Intercontinental, returning Mon, Sep 28, priced at $321 found 3 hours ago
Thu, Sep 24 - Mon, Sep 28
SJU
Luis Munoz Marin Intl.
IAH
George Bush Intercontinental
$326 Roundtrip, found 3 hours ago
$326
Roundtrip
found 3 hours ago
Select United flight, departing Thu, Sep 24 from Luis Munoz Marin Intl. to George Bush Intercontinental, returning Mon, Sep 28, priced at $326 found 3 hours ago
Thu, Dec 3 - Tue, Dec 8
SJU
Luis Munoz Marin Intl.
IAH
George Bush Intercontinental
$330 Roundtrip, found 2 days ago
$330
Roundtrip
found 2 days ago
Select United flight, departing Thu, Dec 3 from Luis Munoz Marin Intl. to George Bush Intercontinental, returning Tue, Dec 8, priced at $330 found 2 days ago
Mon, Oct 26 - Tue, Oct 27
SJU
Luis Munoz Marin Intl.
IAH
George Bush Intercontinental
$334 Roundtrip, found 6 hours ago
$334
Roundtrip
found 6 hours ago
Select United flight, departing Mon, Oct 26 from Luis Munoz Marin Intl. to George Bush Intercontinental, returning Tue, Oct 27, priced at $334 found 6 hours ago
Thu, Dec 3 - Tue, Dec 8
SJU
Luis Munoz Marin Intl.
IAH
George Bush Intercontinental
$339 Roundtrip, found 2 days ago
$339
Roundtrip
found 2 days ago
Select United flight, departing Thu, Dec 3 from Luis Munoz Marin Intl. to George Bush Intercontinental, returning Tue, Dec 8, priced at $339 found 2 days ago
Thu, Dec 3 - Tue, Dec 8
SJU
Luis Munoz Marin Intl.
IAH
George Bush Intercontinental
$340 Roundtrip, found 2 days ago
$340
Roundtrip
found 2 days ago
Select United flight, departing Thu, Dec 3 from Luis Munoz Marin Intl. to George Bush Intercontinental, returning Tue, Dec 8, priced at $340 found 2 days ago
Thu, Dec 3 - Tue, Dec 8
SJU
Luis Munoz Marin Intl.
IAH
George Bush Intercontinental
$344 Roundtrip, found 2 days ago
$344
Roundtrip
found 2 days ago
Select United flight, departing Thu, Dec 3 from Luis Munoz Marin Intl. to George Bush Intercontinental, returning Tue, Dec 8, priced at $344 found 2 days ago
Tue, Oct 20 - Thu, Oct 22
SJU
Luis Munoz Marin Intl.
IAH
George Bush Intercontinental
$347 Roundtrip, found 5 hours ago
$347
Roundtrip
found 5 hours ago
Select United flight, departing Tue, Oct 20 from Luis Munoz Marin Intl. to George Bush Intercontinental, returning Thu, Oct 22, priced at $347 found 5 hours ago
Mon, Oct 26 - Tue, Oct 27
SJU
Luis Munoz Marin Intl.
IAH
George Bush Intercontinental
$348 Roundtrip, found 6 hours ago
$348
Roundtrip
found 6 hours ago
Select United flight, departing Mon, Oct 26 from Luis Munoz Marin Intl. to George Bush Intercontinental, returning Tue, Oct 27, priced at $348 found 6 hours ago
Thu, Dec 3 - Tue, Dec 8
SJU
Luis Munoz Marin Intl.
IAH
George Bush Intercontinental
$349 Roundtrip, found 2 days ago
$349
Roundtrip
found 2 days ago
Select United flight, departing Thu, Dec 3 from Luis Munoz Marin Intl. to George Bush Intercontinental, returning Tue, Dec 8, priced at $349 found 2 days ago
Tue, Oct 20 - Thu, Oct 22
SJU
Luis Munoz Marin Intl.
IAH
George Bush Intercontinental
$351 Roundtrip, found 5 hours ago
$351
Roundtrip
found 5 hours ago
Select United flight, departing Tue, Oct 20 from Luis Munoz Marin Intl. to George Bush Intercontinental, returning Thu, Oct 22, priced at $351 found 5 hours ago
Thu, Dec 3 - Tue, Dec 8
SJU
Luis Munoz Marin Intl.
IAH
George Bush Intercontinental
$360 Roundtrip, found 2 days ago
$360
Roundtrip
found 2 days ago
Select United flight, departing Thu, Dec 3 from Luis Munoz Marin Intl. to George Bush Intercontinental, returning Tue, Dec 8, priced at $360 found 2 days ago
Thu, Dec 3 - Tue, Dec 8
SJU
Luis Munoz Marin Intl.
IAH
George Bush Intercontinental
$368 Roundtrip, found 2 days ago
$368
Roundtrip
found 2 days ago
Select United flight, departing Thu, Dec 3 from Luis Munoz Marin Intl. to George Bush Intercontinental, returning Tue, Dec 8, priced at $368 found 2 days ago
Thu, Dec 3 - Tue, Dec 8
SJU
Luis Munoz Marin Intl.
IAH
George Bush Intercontinental
$370 Roundtrip, found 2 days ago
$370
Roundtrip
found 2 days ago
Select United flight, departing Thu, Dec 3 from Luis Munoz Marin Intl. to George Bush Intercontinental, returning Tue, Dec 8, priced at $370 found 2 days ago

Frequently asked questions

What route does flight number UA668 take?
UA668 takes around 4 hours and 41 minutes to fly direct from Isla Verde Intl. Airport to Houston, TX Airport (IAH-George Bush Intercontinental). Sure, there's magic in the destination, but the journey is always half the fun!
What terminal does UA668 fly out of?
You'll likely be departing from Terminal B if you're flying on UA668 direct from SJU to IAH.
What kind of plane is on flight number UA668?
Get set to cruise the skies aboard a Boeing 737-900 if your flight number is UA668. Nearly all flights from SJU to IAH operate using this aircraft model.
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 UA668 flight with Travelocity, please visit our Customer Service Portal.