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 $228 and $244 for one-way flights to Washington Dulles Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Wed, Sep 23 - Sat, Sep 26
SDF
Louisville Intl.
IAD
Washington Dulles Intl.
$228 Roundtrip, found 6 days ago
$228
Roundtrip
found 6 days ago
Select United flight, departing Wed, Sep 23 from Louisville Intl. to Washington Dulles Intl., returning Sat, Sep 26, priced at $228 found 6 days ago
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
Wed, Sep 23 - Sat, Sep 26
SDF
Louisville Intl.
IAD
Washington Dulles Intl.
$240 Roundtrip, found 6 days ago
$240
Roundtrip
found 6 days ago
Select United flight, departing Wed, Sep 23 from Louisville Intl. to Washington Dulles Intl., returning Sat, Sep 26, priced at $240 found 6 days ago
Fri, May 29 - Mon, Jun 1
SDF
Louisville Intl.
IAD
Washington Dulles Intl.
$248 Roundtrip, found 20 hours ago
$248
Roundtrip
found 20 hours ago
Select United flight, departing Fri, May 29 from Louisville Intl. to Washington Dulles Intl., returning Mon, Jun 1, priced at $248 found 20 hours ago
Thu, Jul 9 - Sun, Jul 12
SDF
Louisville Intl.
IAD
Washington Dulles Intl.
$249 Roundtrip, found 19 hours ago
$249
Roundtrip
found 19 hours ago
Select United flight, departing Thu, Jul 9 from Louisville Intl. to Washington Dulles Intl., returning Sun, Jul 12, priced at $249 found 19 hours ago
Wed, May 20 - Wed, May 27
SDF
Louisville Intl.
IAD
Washington Dulles Intl.
$253 Roundtrip, found 2 days ago
$253
Roundtrip
found 2 days ago
Select United flight, departing Wed, May 20 from Louisville Intl. to Washington Dulles Intl., returning Wed, May 27, priced at $253 found 2 days ago
Fri, May 29 - Mon, Jun 1
SDF
Louisville Intl.
IAD
Washington Dulles Intl.
$265 Roundtrip, found 20 hours ago
$265
Roundtrip
found 20 hours ago
Select United flight, departing Fri, May 29 from Louisville Intl. to Washington Dulles Intl., returning Mon, Jun 1, priced at $265 found 20 hours ago
Fri, Jun 12 - Mon, Jun 15
SDF
Louisville Intl.
IAD
Washington Dulles Intl.
$270 Roundtrip, found 2 days ago
$270
Roundtrip
found 2 days ago
Select United flight, departing Fri, Jun 12 from Louisville Intl. to Washington Dulles Intl., returning Mon, Jun 15, priced at $270 found 2 days ago
Wed, May 20 - Wed, May 27
SDF
Louisville Intl.
IAD
Washington Dulles Intl.
$283 Roundtrip, found 2 days ago
$283
Roundtrip
found 2 days ago
Select United flight, departing Wed, May 20 from Louisville Intl. to Washington Dulles Intl., returning Wed, May 27, priced at $283 found 2 days ago
Fri, May 22 - Mon, May 25
SDF
Louisville Intl.
IAD
Washington Dulles Intl.
$286 Roundtrip, found 2 days ago
$286
Roundtrip
found 2 days ago
Select United flight, departing Fri, May 22 from Louisville Intl. to Washington Dulles Intl., returning Mon, May 25, priced at $286 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.