United Flight 646 Deals & Information (2026/2027)

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United Flight 646 Route Deals From $226

The cheapest prices found with in the last 7 days for return flights were $340 and $226 for one-way flights to Pierre Elliott Trudeau Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Sat, Oct 17 - Thu, Oct 22
ORD
O'Hare Intl.
YUL
Pierre Elliott Trudeau Intl.
$340 Roundtrip, found 1 day ago
$340
Roundtrip
found 1 day ago
Select United flight, departing Sat, Oct 17 from O'Hare Intl. to Pierre Elliott Trudeau Intl., returning Thu, Oct 22, priced at $340 found 1 day ago
Sun, Oct 4 - Wed, Oct 7
ORD
O'Hare Intl.
YUL
Pierre Elliott Trudeau Intl.
$350 Roundtrip, found 2 days ago
$350
Roundtrip
found 2 days ago
Select United flight, departing Sun, Oct 4 from O'Hare Intl. to Pierre Elliott Trudeau Intl., returning Wed, Oct 7, priced at $350 found 2 days ago
Thu, Oct 22 - Mon, Oct 26
ORD
O'Hare Intl.
YUL
Pierre Elliott Trudeau Intl.
$371 Roundtrip, found 7 hours ago
$371
Roundtrip
found 7 hours ago
Select United flight, departing Thu, Oct 22 from O'Hare Intl. to Pierre Elliott Trudeau Intl., returning Mon, Oct 26, priced at $371 found 7 hours ago
Sat, Oct 3 - Tue, Oct 6
ORD
O'Hare Intl.
YUL
Pierre Elliott Trudeau Intl.
$377 Roundtrip, found 1 day ago
$377
Roundtrip
found 1 day ago
Select United flight, departing Sat, Oct 3 from O'Hare Intl. to Pierre Elliott Trudeau Intl., returning Tue, Oct 6, priced at $377 found 1 day ago
Tue, Apr 20 - Sat, Apr 24
ORD
O'Hare Intl.
YUL
Pierre Elliott Trudeau Intl.
$379 Roundtrip, found 2 days ago
$379
Roundtrip
found 2 days ago
Select United flight, departing Tue, Apr 20 from O'Hare Intl. to Pierre Elliott Trudeau Intl., returning Sat, Apr 24, priced at $379 found 2 days ago
Thu, Oct 22 - Mon, Oct 26
ORD
O'Hare Intl.
YUL
Pierre Elliott Trudeau Intl.
$381 Roundtrip, found 7 hours ago
$381
Roundtrip
found 7 hours ago
Select United flight, departing Thu, Oct 22 from O'Hare Intl. to Pierre Elliott Trudeau Intl., returning Mon, Oct 26, priced at $381 found 7 hours ago
Tue, Apr 20 - Sat, Apr 24
ORD
O'Hare Intl.
YUL
Pierre Elliott Trudeau Intl.
$384 Roundtrip, found 2 days ago
$384
Roundtrip
found 2 days ago
Select United flight, departing Tue, Apr 20 from O'Hare Intl. to Pierre Elliott Trudeau Intl., returning Sat, Apr 24, priced at $384 found 2 days 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.