United Flight 3551 Deals & Information (2025/2026)

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United Flight 3551 Route Deals From $65

The cheapest prices found with in the last 7 days for return flights were $97 and $65 for one-way flights to Louisville Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Sat, Dec 6 - Wed, Dec 10
ORD
O'Hare Intl.
SDF
Louisville Intl.
$97 Roundtrip, found 3 days ago
$97
Roundtrip
found 3 days ago
Select United flight, departing Sat, Dec 6 from O'Hare Intl. to Louisville Intl., returning Wed, Dec 10, priced at $97 found 3 days ago
Mon, Nov 3 - Thu, Nov 6
ORD
O'Hare Intl.
SDF
Louisville Intl.
$114 Roundtrip, found 6 days ago
$114
Roundtrip
found 6 days ago
Select United flight, departing Mon, Nov 3 from O'Hare Intl. to Louisville Intl., returning Thu, Nov 6, priced at $114 found 6 days ago
Wed, Oct 8 - Sat, Oct 11
ORD
O'Hare Intl.
SDF
Louisville Intl.
$114 Roundtrip, found 4 days ago
$114
Roundtrip
found 4 days ago
Select United flight, departing Wed, Oct 8 from O'Hare Intl. to Louisville Intl., returning Sat, Oct 11, priced at $114 found 4 days ago
Wed, Oct 1 - Sat, Oct 4
ORD
O'Hare Intl.
SDF
Louisville Intl.
$115 Roundtrip, found 4 days ago
$115
Roundtrip
found 4 days ago
Select United flight, departing Wed, Oct 1 from O'Hare Intl. to Louisville Intl., returning Sat, Oct 4, priced at $115 found 4 days ago
Sat, Oct 18 - Mon, Oct 20
ORD
O'Hare Intl.
SDF
Louisville Intl.
$118 Roundtrip, found 4 days ago
$118
Roundtrip
found 4 days ago
Select United flight, departing Sat, Oct 18 from O'Hare Intl. to Louisville Intl., returning Mon, Oct 20, priced at $118 found 4 days ago
Tue, Oct 7 - Sat, Oct 11
ORD
O'Hare Intl.
SDF
Louisville Intl.
$121 Roundtrip, found 4 days ago
$121
Roundtrip
found 4 days ago
Select United flight, departing Tue, Oct 7 from O'Hare Intl. to Louisville Intl., returning Sat, Oct 11, priced at $121 found 4 days ago
Tue, Oct 7 - Sat, Oct 11
ORD
O'Hare Intl.
SDF
Louisville Intl.
$127 Roundtrip, found 4 days ago
$127
Roundtrip
found 4 days ago
Select United flight, departing Tue, Oct 7 from O'Hare Intl. to Louisville Intl., returning Sat, Oct 11, priced at $127 found 4 days ago
Wed, Oct 8 - Sat, Oct 11
ORD
O'Hare Intl.
SDF
Louisville Intl.
$136 Roundtrip, found 4 days ago
$136
Roundtrip
found 4 days ago
Select United flight, departing Wed, Oct 8 from O'Hare Intl. to Louisville Intl., returning Sat, Oct 11, priced at $136 found 4 days ago
Sat, Oct 25 - Mon, Oct 27
ORD
O'Hare Intl.
SDF
Louisville Intl.
$139 Roundtrip, found 16 hours ago
$139
Roundtrip
found 16 hours ago
Select United flight, departing Sat, Oct 25 from O'Hare Intl. to Louisville Intl., returning Mon, Oct 27, priced at $139 found 16 hours ago
Wed, Oct 1 - Sat, Oct 4
ORD
O'Hare Intl.
SDF
Louisville Intl.
$146 Roundtrip, found 4 days ago
$146
Roundtrip
found 4 days ago
Select United flight, departing Wed, Oct 1 from O'Hare Intl. to Louisville Intl., returning Sat, Oct 4, priced at $146 found 4 days 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.