United Flight 3551 Deals & Information (2026/2027)

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United Flight 3551 Route Deals From $137

The cheapest prices found with in the last 7 days for return flights were $275 and $137 for one-way flights to O'Hare Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Fri, May 22 - Mon, May 25
PWM
Portland Intl. Jetport
ORD
O'Hare Intl.
$275 Roundtrip, found 5 days ago
$275
Roundtrip
found 5 days ago
Select United flight, departing Fri, May 22 from Portland Intl. Jetport to O'Hare Intl., returning Mon, May 25, priced at $275 found 5 days ago
Tue, Jul 28 - Tue, Aug 11
PWM
Portland Intl. Jetport
ORD
O'Hare Intl.
$283 Roundtrip, found 6 days ago
$283
Roundtrip
found 6 days ago
Select United flight, departing Tue, Jul 28 from Portland Intl. Jetport to O'Hare Intl., returning Tue, Aug 11, priced at $283 found 6 days ago
Wed, Sep 9 - Fri, Sep 11
PWM
Portland Intl. Jetport
ORD
O'Hare Intl.
$293 Roundtrip, found 6 days ago
$293
Roundtrip
found 6 days ago
Select United flight, departing Wed, Sep 9 from Portland Intl. Jetport to O'Hare Intl., returning Fri, Sep 11, priced at $293 found 6 days ago
Tue, Aug 25 - Wed, Aug 26
PWM
Portland Intl. Jetport
ORD
O'Hare Intl.
$307 Roundtrip, found 2 days ago
$307
Roundtrip
found 2 days ago
Select United flight, departing Tue, Aug 25 from Portland Intl. Jetport to O'Hare Intl., returning Wed, Aug 26, priced at $307 found 2 days ago
Thu, Jun 25 - Sun, Jun 28
PWM
Portland Intl. Jetport
ORD
O'Hare Intl.
$313 Roundtrip, found 5 days ago
$313
Roundtrip
found 5 days ago
Select United flight, departing Thu, Jun 25 from Portland Intl. Jetport to O'Hare Intl., returning Sun, Jun 28, priced at $313 found 5 days ago
Sat, Sep 12 - Tue, Sep 15
PWM
Portland Intl. Jetport
ORD
O'Hare Intl.
$322 Roundtrip, found 5 days ago
$322
Roundtrip
found 5 days ago
Select United flight, departing Sat, Sep 12 from Portland Intl. Jetport to O'Hare Intl., returning Tue, Sep 15, priced at $322 found 5 days ago
Thu, Aug 13 - Fri, Aug 14
PWM
Portland Intl. Jetport
ORD
O'Hare Intl.
$371 Roundtrip, found 9 hours ago
$371
Roundtrip
found 9 hours ago
Select United flight, departing Thu, Aug 13 from Portland Intl. Jetport to O'Hare Intl., returning Fri, Aug 14, priced at $371 found 9 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.