United Flight 3991 Deals & Information (2025/2026)

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United Flight 3991 Route Deals From $117

The cheapest prices found with in the last 7 days for return flights were $265 and $117 for one-way flights to Charleston Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Tue, Nov 11 - Sat, Nov 15
IAH
George Bush Intercontinental
CHS
Charleston Intl.
$265 Roundtrip, found 13 hours ago
$265
Roundtrip
found 13 hours ago
Select United flight, departing Tue, Nov 11 from George Bush Intercontinental to Charleston Intl., returning Sat, Nov 15, priced at $265 found 13 hours ago

Frequently asked questions

What route does flight number UA3991 take?
UA3991 flies directly from IAD to Manchester, NH Airport (MHT-Manchester-Boston Regional). During this trip, expect to be in the air for approximately 1 hour and 32 minutes. Consider booking ahead to lock in your preferred seat.
What kind of plane is on flight number UA3991?
The Bombardier CRJ is the aircraft model usually used for flight number UA3991. This flight almost always jets off from Washington, DC Airport (IAD-Washington Dulles Intl.) and touches down at Manchester, NH Airport (MHT-Manchester-Boston Regional).
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 UA3991 flight with Travelocity, please visit our Customer Service Portal.