United Flight 3640 Deals & Information (2025/2026)

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United Flight 3640 Route Deals From $92

The cheapest prices found with in the last 7 days for return flights were $186 and $92 for one-way flights to Washington Dulles Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Tue, Oct 21 - Wed, Oct 22
DTW
Detroit Metropolitan Wayne County
IAD
Washington Dulles Intl.
$186 Roundtrip, found 2 days ago
$186
Roundtrip
found 2 days ago
Select United flight, departing Tue, Oct 21 from Detroit Metropolitan Wayne County to Washington Dulles Intl., returning Wed, Oct 22, priced at $186 found 2 days ago
Fri, Oct 31 - Mon, Nov 3
DTW
Detroit Metropolitan Wayne County
IAD
Washington Dulles Intl.
$188 Roundtrip, found 2 days ago
$188
Roundtrip
found 2 days ago
Select United flight, departing Fri, Oct 31 from Detroit Metropolitan Wayne County to Washington Dulles Intl., returning Mon, Nov 3, priced at $188 found 2 days ago
Tue, Oct 28 - Wed, Oct 29
DTW
Detroit Metropolitan Wayne County
IAD
Washington Dulles Intl.
$192 Roundtrip, found 3 days ago
$192
Roundtrip
found 3 days ago
Select United flight, departing Tue, Oct 28 from Detroit Metropolitan Wayne County to Washington Dulles Intl., returning Wed, Oct 29, priced at $192 found 3 days ago
Sat, Nov 8 - Mon, Nov 10
DTW
Detroit Metropolitan Wayne County
IAD
Washington Dulles Intl.
$192 Roundtrip, found 2 hours ago
$192
Roundtrip
found 2 hours 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 2 hours ago
Wed, Oct 1 - Sat, Oct 4
DTW
Detroit Metropolitan Wayne County
IAD
Washington Dulles Intl.
$194 Roundtrip, found 19 hours ago
$194
Roundtrip
found 19 hours ago
Select United flight, departing Wed, Oct 1 from Detroit Metropolitan Wayne County to Washington Dulles Intl., returning Sat, Oct 4, priced at $194 found 19 hours ago
Sun, Sep 21 - Sun, Sep 28
DTW
Detroit Metropolitan Wayne County
IAD
Washington Dulles Intl.
$198 Roundtrip, found 2 days ago
$198
Roundtrip
found 2 days ago
Select United flight, departing Sun, Sep 21 from Detroit Metropolitan Wayne County to Washington Dulles Intl., returning Sun, Sep 28, priced at $198 found 2 days ago
Fri, Sep 19 - Tue, Sep 23
DTW
Detroit Metropolitan Wayne County
IAD
Washington Dulles Intl.
$203 Roundtrip, found 4 days ago
$203
Roundtrip
found 4 days ago
Select United flight, departing Fri, Sep 19 from Detroit Metropolitan Wayne County to Washington Dulles Intl., returning Tue, Sep 23, priced at $203 found 4 days ago
Wed, Oct 22 - Sat, Oct 25
DTW
Detroit Metropolitan Wayne County
IAD
Washington Dulles Intl.
$211 Roundtrip, found 5 days ago
$211
Roundtrip
found 5 days ago
Select United flight, departing Wed, Oct 22 from Detroit Metropolitan Wayne County to Washington Dulles Intl., returning Sat, Oct 25, priced at $211 found 5 days ago
Sat, Nov 8 - Mon, Nov 10
DTW
Detroit Metropolitan Wayne County
IAD
Washington Dulles Intl.
$253 Roundtrip, found 2 hours ago
$253
Roundtrip
found 2 hours ago
Select United flight, departing Sat, Nov 8 from Detroit Metropolitan Wayne County to Washington Dulles Intl., returning Mon, Nov 10, priced at $253 found 2 hours 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.