United Flight 3551 Deals & Information (2025/2026)

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United Flight 3551 Route Deals From $49

The cheapest prices found with in the last 7 days for return flights were $110 and $49 for one-way flights to Louisville Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Tue, Oct 28 - Thu, Oct 30
ORD
O'Hare Intl.
SDF
Louisville Intl.
$110 Roundtrip, found 2 days ago
$110
Roundtrip
found 2 days ago
Select United flight, departing Tue, Oct 28 from O'Hare Intl. to Louisville Intl., returning Thu, Oct 30, priced at $110 found 2 days ago
Tue, Oct 28 - Thu, Oct 30
ORD
O'Hare Intl.
SDF
Louisville Intl.
$112 Roundtrip, found 2 days ago
$112
Roundtrip
found 2 days ago
Select United flight, departing Tue, Oct 28 from O'Hare Intl. to Louisville Intl., returning Thu, Oct 30, priced at $112 found 2 days ago
Tue, Oct 28 - Thu, Oct 30
ORD
O'Hare Intl.
SDF
Louisville Intl.
$171 Roundtrip, found 2 days ago
$171
Roundtrip
found 2 days ago
Select United flight, departing Tue, Oct 28 from O'Hare Intl. to Louisville Intl., returning Thu, Oct 30, priced at $171 found 2 days ago
Tue, Oct 28 - Thu, Oct 30
ORD
O'Hare Intl.
SDF
Louisville Intl.
$173 Roundtrip, found 2 days ago
$173
Roundtrip
found 2 days ago
Select United flight, departing Tue, Oct 28 from O'Hare Intl. to Louisville Intl., returning Thu, Oct 30, priced at $173 found 2 days ago
Sat, Nov 15 - Mon, Nov 17
ORD
O'Hare Intl.
SDF
Louisville Intl.
$175 Roundtrip, found 4 days ago
$175
Roundtrip
found 4 days ago
Select United flight, departing Sat, Nov 15 from O'Hare Intl. to Louisville Intl., returning Mon, Nov 17, priced at $175 found 4 days ago
Thu, Oct 23 - Sat, Oct 25
ORD
O'Hare Intl.
SDF
Louisville Intl.
$240 Roundtrip, found 6 hours ago
$240
Roundtrip
found 6 hours ago
Select United flight, departing Thu, Oct 23 from O'Hare Intl. to Louisville Intl., returning Sat, Oct 25, priced at $240 found 6 hours ago
Thu, Oct 23 - Sat, Oct 25
ORD
O'Hare Intl.
SDF
Louisville Intl.
$252 Roundtrip, found 6 hours ago
$252
Roundtrip
found 6 hours ago
Select United flight, departing Thu, Oct 23 from O'Hare Intl. to Louisville Intl., returning Sat, Oct 25, priced at $252 found 6 hours ago
Thu, Oct 23 - Sat, Oct 25
ORD
O'Hare Intl.
SDF
Louisville Intl.
$271 Roundtrip, found 6 hours ago
$271
Roundtrip
found 6 hours ago
Select United flight, departing Thu, Oct 23 from O'Hare Intl. to Louisville Intl., returning Sat, Oct 25, priced at $271 found 6 hours ago
Thu, Oct 23 - Sun, Oct 26
ORD
O'Hare Intl.
SDF
Louisville Intl.
$273 Roundtrip, found 1 day ago
$273
Roundtrip
found 1 day ago
Select United flight, departing Thu, Oct 23 from O'Hare Intl. to Louisville Intl., returning Sun, Oct 26, priced at $273 found 1 day ago
Thu, Oct 23 - Sun, Oct 26
ORD
O'Hare Intl.
SDF
Louisville Intl.
$286 Roundtrip, found 1 day ago
$286
Roundtrip
found 1 day ago
Select United flight, departing Thu, Oct 23 from O'Hare Intl. to Louisville Intl., returning Sun, Oct 26, priced at $286 found 1 day 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.