United Flight 3551 Deals & Information (2025/2026)

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United Flight 3551 Route Deals From $39

The cheapest prices found with in the last 7 days for return flights were $97 and $39 for one-way flights to Louisville Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Tue, Nov 11 - Wed, Nov 12
ORD
O'Hare Intl.
SDF
Louisville Intl.
$97 Roundtrip, found 1 day ago
$97
Roundtrip
found 1 day ago
Select United flight, departing Tue, Nov 11 from O'Hare Intl. to Louisville Intl., returning Wed, Nov 12, priced at $97 found 1 day ago
Tue, Nov 11 - Wed, Nov 12
ORD
O'Hare Intl.
SDF
Louisville Intl.
$109 Roundtrip, found 1 day ago
$109
Roundtrip
found 1 day ago
Select United flight, departing Tue, Nov 11 from O'Hare Intl. to Louisville Intl., returning Wed, Nov 12, priced at $109 found 1 day ago
Tue, Oct 28 - Thu, Oct 30
ORD
O'Hare Intl.
SDF
Louisville Intl.
$110 Roundtrip, found 5 days ago
$110
Roundtrip
found 5 days ago
Select United flight, departing Tue, Oct 28 from O'Hare Intl. to Louisville Intl., returning Thu, Oct 30, priced at $110 found 5 days ago
Tue, Oct 28 - Thu, Oct 30
ORD
O'Hare Intl.
SDF
Louisville Intl.
$112 Roundtrip, found 5 days ago
$112
Roundtrip
found 5 days ago
Select United flight, departing Tue, Oct 28 from O'Hare Intl. to Louisville Intl., returning Thu, Oct 30, priced at $112 found 5 days ago
Tue, Nov 11 - Wed, Nov 12
ORD
O'Hare Intl.
SDF
Louisville Intl.
$166 Roundtrip, found 1 day ago
$166
Roundtrip
found 1 day ago
Select United flight, departing Tue, Nov 11 from O'Hare Intl. to Louisville Intl., returning Wed, Nov 12, priced at $166 found 1 day ago
Tue, Nov 11 - Wed, Nov 12
ORD
O'Hare Intl.
SDF
Louisville Intl.
$170 Roundtrip, found 1 day ago
$170
Roundtrip
found 1 day ago
Select United flight, departing Tue, Nov 11 from O'Hare Intl. to Louisville Intl., returning Wed, Nov 12, priced at $170 found 1 day ago
Tue, Oct 28 - Thu, Oct 30
ORD
O'Hare Intl.
SDF
Louisville Intl.
$171 Roundtrip, found 5 days ago
$171
Roundtrip
found 5 days ago
Select United flight, departing Tue, Oct 28 from O'Hare Intl. to Louisville Intl., returning Thu, Oct 30, priced at $171 found 5 days ago
Thu, Dec 4 - Fri, Dec 5
ORD
O'Hare Intl.
SDF
Louisville Intl.
$171 Roundtrip, found 8 hours ago
$171
Roundtrip
found 8 hours ago
Select United flight, departing Thu, Dec 4 from O'Hare Intl. to Louisville Intl., returning Fri, Dec 5, priced at $171 found 8 hours ago
Tue, Oct 28 - Thu, Oct 30
ORD
O'Hare Intl.
SDF
Louisville Intl.
$173 Roundtrip, found 5 days ago
$173
Roundtrip
found 5 days ago
Select United flight, departing Tue, Oct 28 from O'Hare Intl. to Louisville Intl., returning Thu, Oct 30, priced at $173 found 5 days ago
Thu, Dec 4 - Fri, Dec 5
ORD
O'Hare Intl.
SDF
Louisville Intl.
$174 Roundtrip, found 8 hours ago
$174
Roundtrip
found 8 hours ago
Select United flight, departing Thu, Dec 4 from O'Hare Intl. to Louisville Intl., returning Fri, Dec 5, priced at $174 found 8 hours ago

Frequently asked questions

What route does flight number UA3551 take?
Flight number UA3551 operates directly from ORD to EYW. During this journey, you'll be in the air for approximately 3 hours and 9 minutes. Consider booking ahead to secure your preferred seat.
What terminal does UA3551 fly out of?
You'll likely be departing from Terminal 2 if you're booked on flight UA3551 direct from O'Hare Intl. Airport (ORD) to Key West, FL Airport (EYW-Key West Intl.).
What kind of plane is on flight number UA3551?
The Embraer 170 is the aircraft type most commonly used for flight UA3551. This flight almost always jets off from Chicago, IL Airport (ORD-O'Hare Intl.) and touches down at Key West, FL Airport (EYW-Key West Intl.).
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 UA3551 flight with Travelocity, please visit our Customer Service Portal.