United Flight 3640 Deals & Information (2025/2026)

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United Flight 3640 Route Deals From $91

The cheapest prices found with in the last 7 days for return flights were $191 and $91 for one-way flights to Washington Dulles Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Mon, Nov 3 - Thu, Nov 13
DTW
Detroit Metropolitan Wayne County
IAD
Washington Dulles Intl.
$191 Roundtrip, found 1 day ago
$191
Roundtrip
found 1 day ago
Select United flight, departing Mon, Nov 3 from Detroit Metropolitan Wayne County to Washington Dulles Intl., returning Thu, Nov 13, priced at $191 found 1 day ago
Sat, Nov 8 - Mon, Nov 10
DTW
Detroit Metropolitan Wayne County
IAD
Washington Dulles Intl.
$192 Roundtrip, found 1 day ago
$192
Roundtrip
found 1 day ago
Select United flight, departing Sat, Nov 8 from Detroit Metropolitan Wayne County to Washington Dulles Intl., returning Mon, Nov 10, priced at $192 found 1 day ago
Sat, Mar 28 - Thu, Apr 2
DTW
Detroit Metropolitan Wayne County
IAD
Washington Dulles Intl.
$198 Roundtrip, found 19 hours ago
$198
Roundtrip
found 19 hours ago
Select United flight, departing Sat, Mar 28 from Detroit Metropolitan Wayne County to Washington Dulles Intl., returning Thu, Apr 2, priced at $198 found 19 hours ago
Sat, Mar 28 - Thu, Apr 2
DTW
Detroit Metropolitan Wayne County
IAD
Washington Dulles Intl.
$204 Roundtrip, found 19 hours ago
$204
Roundtrip
found 19 hours ago
Select United flight, departing Sat, Mar 28 from Detroit Metropolitan Wayne County to Washington Dulles Intl., returning Thu, Apr 2, priced at $204 found 19 hours ago
Sat, Nov 1 - Thu, Nov 6
DTW
Detroit Metropolitan Wayne County
IAD
Washington Dulles Intl.
$208 Roundtrip, found 2 days ago
$208
Roundtrip
found 2 days ago
Select United flight, departing Sat, Nov 1 from Detroit Metropolitan Wayne County to Washington Dulles Intl., returning Thu, Nov 6, priced at $208 found 2 days ago
Mon, Nov 10 - Fri, Nov 14
DTW
Detroit Metropolitan Wayne County
IAD
Washington Dulles Intl.
$210 Roundtrip, found 1 day ago
$210
Roundtrip
found 1 day ago
Select United flight, departing Mon, Nov 10 from Detroit Metropolitan Wayne County to Washington Dulles Intl., returning Fri, Nov 14, priced at $210 found 1 day ago
Mon, Nov 3 - Thu, Nov 13
DTW
Detroit Metropolitan Wayne County
IAD
Washington Dulles Intl.
$211 Roundtrip, found 1 day ago
$211
Roundtrip
found 1 day ago
Select United flight, departing Mon, Nov 3 from Detroit Metropolitan Wayne County to Washington Dulles Intl., returning Thu, Nov 13, priced at $211 found 1 day ago
Sat, Nov 1 - Thu, Nov 6
DTW
Detroit Metropolitan Wayne County
IAD
Washington Dulles Intl.
$213 Roundtrip, found 2 days ago
$213
Roundtrip
found 2 days ago
Select United flight, departing Sat, Nov 1 from Detroit Metropolitan Wayne County to Washington Dulles Intl., returning Thu, Nov 6, priced at $213 found 2 days 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.