American Airlines Flight 851 Deals & Information (2026/2027)

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American Airlines Flight 851 Route Deals From $89

The cheapest prices found with in the last 7 days for return flights were $177 and $89 for one-way flights to O'Hare Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Fri, Feb 27 - Wed, Mar 11
SEA
Seattle - Tacoma Intl.
ORD
O'Hare Intl.
$177 Roundtrip, found 11 hours ago
$177
Roundtrip
found 11 hours ago
Select American Airlines flight, departing Fri, Feb 27 from Seattle - Tacoma Intl. to O'Hare Intl., returning Wed, Mar 11, priced at $177 found 11 hours ago
Wed, Mar 18 - Thu, Mar 19
SEA
Seattle - Tacoma Intl.
ORD
O'Hare Intl.
$179 Roundtrip, found 4 days ago
$179
Roundtrip
found 4 days ago
Select American Airlines flight, departing Wed, Mar 18 from Seattle - Tacoma Intl. to O'Hare Intl., returning Thu, Mar 19, priced at $179 found 4 days ago
Sat, Mar 7 - Sat, Mar 14
SEA
Seattle - Tacoma Intl.
ORD
O'Hare Intl.
$182 Roundtrip, found 2 hours ago
$182
Roundtrip
found 2 hours ago
Select American Airlines flight, departing Sat, Mar 7 from Seattle - Tacoma Intl. to O'Hare Intl., returning Sat, Mar 14, priced at $182 found 2 hours ago
Tue, Mar 10 - Tue, Mar 17
SEA
Seattle - Tacoma Intl.
ORD
O'Hare Intl.
$182 Roundtrip, found 3 days ago
$182
Roundtrip
found 3 days ago
Select American Airlines flight, departing Tue, Mar 10 from Seattle - Tacoma Intl. to O'Hare Intl., returning Tue, Mar 17, priced at $182 found 3 days ago
Fri, Feb 27 - Wed, Mar 11
SEA
Seattle - Tacoma Intl.
ORD
O'Hare Intl.
$186 Roundtrip, found 11 hours ago
$186
Roundtrip
found 11 hours ago
Select American Airlines flight, departing Fri, Feb 27 from Seattle - Tacoma Intl. to O'Hare Intl., returning Wed, Mar 11, priced at $186 found 11 hours ago
Sat, Mar 7 - Sat, Mar 14
SEA
Seattle - Tacoma Intl.
ORD
O'Hare Intl.
$187 Roundtrip, found 2 hours ago
$187
Roundtrip
found 2 hours ago
Select American Airlines flight, departing Sat, Mar 7 from Seattle - Tacoma Intl. to O'Hare Intl., returning Sat, Mar 14, priced at $187 found 2 hours ago
Thu, Mar 26 - Wed, Apr 1
SEA
Seattle - Tacoma Intl.
ORD
O'Hare Intl.
$191 Roundtrip, found 14 hours ago
$191
Roundtrip
found 14 hours ago
Select American Airlines flight, departing Thu, Mar 26 from Seattle - Tacoma Intl. to O'Hare Intl., returning Wed, Apr 1, priced at $191 found 14 hours ago
Sat, Mar 7 - Sat, Mar 14
SEA
Seattle - Tacoma Intl.
ORD
O'Hare Intl.
$196 Roundtrip, found 2 hours ago
$196
Roundtrip
found 2 hours ago
Select American Airlines flight, departing Sat, Mar 7 from Seattle - Tacoma Intl. to O'Hare Intl., returning Sat, Mar 14, priced at $196 found 2 hours ago

Frequently asked questions

What route does flight number AA851 take?
You'll be landing into Philadelphia, PA Airport (PHL-Philadelphia Intl.) from Los Angeles, CA Airport (LAX-Los Angeles Intl.) if you're traveling on flight number AA851. You'll be airborne for 5 hours and 14 minutes on this trip. It's also good to note that the flight conveniently operates non-stop.
How often is AA851 on time?
Approximately 90% of AA851 flights arrive according to scheduled times — so if you're traveling from Los Angeles, CA Airport (LAX-Los Angeles Intl.) to Philadelphia Intl. Airport (PHL), you can breathe easy knowing that you'll reach your destination as quickly as possible. If your American Airlines flight is late, you're likely to wait around 16 minutes. Due to the airline's first-rate service, this route has a 3.45-star rating.
What kind of plane is on flight number AA851?
There's a good chance you'll be traveling aboard an Airbus A321 if you're traveling on flight number AA851. This flight nearly always takes off from Los Angeles, CA Airport (LAX-Los Angeles Intl.) and lands at Philadelphia, PA Airport (PHL-Philadelphia 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 AA851 flight with Travelocity, please visit our Customer Service Portal.