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 $77 and $39 for one-way flights to Louisville Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Sat, Aug 30 - Tue, Sep 2
ORD
O'Hare Intl.
SDF
Louisville Intl.
$77 Roundtrip, found 17 hours ago
$77
Roundtrip
found 17 hours ago
Select United flight, departing Sat, Aug 30 from O'Hare Intl. to Louisville Intl., returning Tue, Sep 2, priced at $77 found 17 hours ago
Sat, Aug 30 - Tue, Sep 2
ORD
O'Hare Intl.
SDF
Louisville Intl.
$84 Roundtrip, found 17 hours ago
$84
Roundtrip
found 17 hours ago
Select United flight, departing Sat, Aug 30 from O'Hare Intl. to Louisville Intl., returning Tue, Sep 2, priced at $84 found 17 hours ago
Mon, Sep 8 - Thu, Sep 11
ORD
O'Hare Intl.
SDF
Louisville Intl.
$91 Roundtrip, found 2 days ago
$91
Roundtrip
found 2 days ago
Select United flight, departing Mon, Sep 8 from O'Hare Intl. to Louisville Intl., returning Thu, Sep 11, priced at $91 found 2 days ago
Thu, Sep 4 - Sat, Sep 6
ORD
O'Hare Intl.
SDF
Louisville Intl.
$94 Roundtrip, found 18 hours ago
$94
Roundtrip
found 18 hours ago
Select United flight, departing Thu, Sep 4 from O'Hare Intl. to Louisville Intl., returning Sat, Sep 6, priced at $94 found 18 hours ago
Mon, Oct 20 - Thu, Oct 23
ORD
O'Hare Intl.
SDF
Louisville Intl.
$100 Roundtrip, found 3 days ago
$100
Roundtrip
found 3 days ago
Select United flight, departing Mon, Oct 20 from O'Hare Intl. to Louisville Intl., returning Thu, Oct 23, priced at $100 found 3 days ago
Thu, Sep 4 - Sat, Sep 6
ORD
O'Hare Intl.
SDF
Louisville Intl.
$101 Roundtrip, found 18 hours ago
$101
Roundtrip
found 18 hours ago
Select United flight, departing Thu, Sep 4 from O'Hare Intl. to Louisville Intl., returning Sat, Sep 6, priced at $101 found 18 hours ago
Thu, Sep 4 - Sat, Sep 6
ORD
O'Hare Intl.
SDF
Louisville Intl.
$107 Roundtrip, found 18 hours ago
$107
Roundtrip
found 18 hours ago
Select United flight, departing Thu, Sep 4 from O'Hare Intl. to Louisville Intl., returning Sat, Sep 6, priced at $107 found 18 hours ago
Sat, Aug 30 - Tue, Sep 2
ORD
O'Hare Intl.
SDF
Louisville Intl.
$107 Roundtrip, found 17 hours ago
$107
Roundtrip
found 17 hours ago
Select United flight, departing Sat, Aug 30 from O'Hare Intl. to Louisville Intl., returning Tue, Sep 2, priced at $107 found 17 hours ago
Thu, Sep 4 - Sat, Sep 6
ORD
O'Hare Intl.
SDF
Louisville Intl.
$109 Roundtrip, found 18 hours ago
$109
Roundtrip
found 18 hours ago
Select United flight, departing Thu, Sep 4 from O'Hare Intl. to Louisville Intl., returning Sat, Sep 6, priced at $109 found 18 hours ago
Sat, Sep 13 - Tue, Sep 16
ORD
O'Hare Intl.
SDF
Louisville Intl.
$111 Roundtrip, found 6 days ago
$111
Roundtrip
found 6 days ago
Select United flight, departing Sat, Sep 13 from O'Hare Intl. to Louisville Intl., returning Tue, Sep 16, priced at $111 found 6 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.