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 $242

The cheapest prices found with in the last 7 days for return flights were $355 and $242 for one-way flights to George Bush Intercontinental for the period specified. Prices and availability are subject to change. Additional terms apply.

Thu, Apr 23 - Mon, Apr 27
SJU
Luis Munoz Marin Intl.
IAH
George Bush Intercontinental
$355 Roundtrip, found 8 hours ago
$355
Roundtrip
found 8 hours ago
Select United flight, departing Thu, Apr 23 from Luis Munoz Marin Intl. to George Bush Intercontinental, returning Mon, Apr 27, priced at $355 found 8 hours 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.