United Flight AC3640 Deals & Information (2025/2026)

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United Flight 3640 Route Deals From $103

The cheapest prices found with in the last 7 days for return flights were $188 and $103 for one-way flights to O'Hare Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Wed, Aug 27 - Wed, Sep 3
YYZ
Pearson Intl.
ORD
O'Hare Intl.
$188 Roundtrip, found 5 days ago
$188
Roundtrip
found 5 days ago
Select United flight, departing Wed, Aug 27 from Pearson Intl. to O'Hare Intl., returning Wed, Sep 3, priced at $188 found 5 days ago
Tue, Jul 22 - Wed, Jul 23
YYZ
Pearson Intl.
ORD
O'Hare Intl.
$194 Roundtrip, found 1 day ago
$194
Roundtrip
found 1 day ago
Select United flight, departing Tue, Jul 22 from Pearson Intl. to O'Hare Intl., returning Wed, Jul 23, priced at $194 found 1 day ago
Tue, Jul 22 - Wed, Jul 23
YYZ
Pearson Intl.
ORD
O'Hare Intl.
$203 Roundtrip, found 1 day ago
$203
Roundtrip
found 1 day ago
Select United flight, departing Tue, Jul 22 from Pearson Intl. to O'Hare Intl., returning Wed, Jul 23, priced at $203 found 1 day ago
Tue, Jul 22 - Wed, Jul 23
YYZ
Pearson Intl.
ORD
O'Hare Intl.
$218 Roundtrip, found 1 day ago
$218
Roundtrip
found 1 day ago
Select United flight, departing Tue, Jul 22 from Pearson Intl. to O'Hare Intl., returning Wed, Jul 23, priced at $218 found 1 day ago
Thu, Aug 21 - Mon, Aug 25
YYZ
Pearson Intl.
ORD
O'Hare Intl.
$235 Roundtrip, found 1 day ago
$235
Roundtrip
found 1 day ago
Select United flight, departing Thu, Aug 21 from Pearson Intl. to O'Hare Intl., returning Mon, Aug 25, priced at $235 found 1 day ago

Frequently asked questions

What route does flight number UA3640 take?
UA3640 travels between O'Hare Intl. Airport (ORD) and Bangor International Airport directly. This trip usually takes 2 hours and 26 minutes.
What terminal does UA3640 fly out of?
UA3640 runs between O'Hare Airport and Bangor International Airport, and passengers traveling on this flight usually jet off from Terminal 2.
What kind of plane is on flight number UA3640?
Get ready to hop on board an Embraer 175 if you've reserved a seat on flight UA3640. Most services from O'Hare Intl. Airport (ORD) to Bangor, ME Airport (BGR-Bangor Intl.) are operated using this kind of plane.
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 UA3640 flight with Travelocity, please visit our Customer Service Portal.