United Flight 3640 Deals & Information (2026/2027)

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United Flight 3640 Route Deals From $244

The cheapest prices found with in the last 7 days for return flights were $235 and $244 for one-way flights to Washington Dulles Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Thu, Sep 3 - Mon, Sep 7
SDF
Louisville Intl.
IAD
Washington Dulles Intl.
$235 Roundtrip, found 1 day ago
$235
Roundtrip
found 1 day ago
Select United flight, departing Thu, Sep 3 from Louisville Intl. to Washington Dulles Intl., returning Mon, Sep 7, priced at $235 found 1 day ago
Fri, May 29 - Mon, Jun 1
SDF
Louisville Intl.
IAD
Washington Dulles Intl.
$248 Roundtrip, found 1 day ago
$248
Roundtrip
found 1 day ago
Select United flight, departing Fri, May 29 from Louisville Intl. to Washington Dulles Intl., returning Mon, Jun 1, priced at $248 found 1 day ago
Wed, Jul 29 - Sun, Aug 2
SDF
Louisville Intl.
IAD
Washington Dulles Intl.
$249 Roundtrip, found 12 hours ago
$249
Roundtrip
found 12 hours ago
Select United flight, departing Wed, Jul 29 from Louisville Intl. to Washington Dulles Intl., returning Sun, Aug 2, priced at $249 found 12 hours ago
Wed, May 20 - Wed, May 27
SDF
Louisville Intl.
IAD
Washington Dulles Intl.
$253 Roundtrip, found 3 days ago
$253
Roundtrip
found 3 days ago
Select United flight, departing Wed, May 20 from Louisville Intl. to Washington Dulles Intl., returning Wed, May 27, priced at $253 found 3 days ago
Thu, Jun 11 - Tue, Jun 16
SDF
Louisville Intl.
IAD
Washington Dulles Intl.
$255 Roundtrip, found 8 hours ago
$255
Roundtrip
found 8 hours ago
Select United flight, departing Thu, Jun 11 from Louisville Intl. to Washington Dulles Intl., returning Tue, Jun 16, priced at $255 found 8 hours ago
Fri, May 29 - Mon, Jun 1
SDF
Louisville Intl.
IAD
Washington Dulles Intl.
$265 Roundtrip, found 1 day ago
$265
Roundtrip
found 1 day ago
Select United flight, departing Fri, May 29 from Louisville Intl. to Washington Dulles Intl., returning Mon, Jun 1, priced at $265 found 1 day ago
Thu, Jun 11 - Tue, Jun 16
SDF
Louisville Intl.
IAD
Washington Dulles Intl.
$270 Roundtrip, found 8 hours ago
$270
Roundtrip
found 8 hours ago
Select United flight, departing Thu, Jun 11 from Louisville Intl. to Washington Dulles Intl., returning Tue, Jun 16, priced at $270 found 8 hours ago
Wed, May 20 - Wed, May 27
SDF
Louisville Intl.
IAD
Washington Dulles Intl.
$283 Roundtrip, found 3 days ago
$283
Roundtrip
found 3 days ago
Select United flight, departing Wed, May 20 from Louisville Intl. to Washington Dulles Intl., returning Wed, May 27, priced at $283 found 3 days ago
Thu, Jul 23 - Sat, Jul 25
SDF
Louisville Intl.
IAD
Washington Dulles Intl.
$287 Roundtrip, found 3 days ago
$287
Roundtrip
found 3 days ago
Select United flight, departing Thu, Jul 23 from Louisville Intl. to Washington Dulles Intl., returning Sat, Jul 25, priced at $287 found 3 days ago
Thu, Sep 3 - Mon, Sep 7
SDF
Louisville Intl.
IAD
Washington Dulles Intl.
$305 Roundtrip, found 1 day ago
$305
Roundtrip
found 1 day ago
Select United flight, departing Thu, Sep 3 from Louisville Intl. to Washington Dulles Intl., returning Mon, Sep 7, priced at $305 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.