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

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American Airlines Flight 851 Route Deals From $93

The cheapest prices found with in the last 7 days for return flights were $177 and $93 for one-way flights to O'Hare Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Tue, Mar 10 - Tue, Mar 17
SEA
Seattle - Tacoma Intl.
ORD
O'Hare Intl.
$177 Roundtrip, found 1 day ago
$177
Roundtrip
found 1 day ago
Select American Airlines flight, departing Tue, Mar 10 from Seattle - Tacoma Intl. to O'Hare Intl., returning Tue, Mar 17, priced at $177 found 1 day ago
Wed, Mar 18 - Thu, Mar 19
SEA
Seattle - Tacoma Intl.
ORD
O'Hare Intl.
$179 Roundtrip, found 2 days ago
$179
Roundtrip
found 2 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 2 days ago
Tue, Mar 10 - Tue, Mar 17
SEA
Seattle - Tacoma Intl.
ORD
O'Hare Intl.
$179 Roundtrip, found 1 day ago
$179
Roundtrip
found 1 day ago
Select American Airlines flight, departing Tue, Mar 10 from Seattle - Tacoma Intl. to O'Hare Intl., returning Tue, Mar 17, priced at $179 found 1 day ago
Tue, Mar 10 - Tue, Mar 17
SEA
Seattle - Tacoma Intl.
ORD
O'Hare Intl.
$182 Roundtrip, found 1 day ago
$182
Roundtrip
found 1 day 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 1 day ago
Wed, Mar 18 - Wed, Mar 25
SEA
Seattle - Tacoma Intl.
ORD
O'Hare Intl.
$186 Roundtrip, found 4 days ago
$186
Roundtrip
found 4 days ago
Select American Airlines flight, departing Wed, Mar 18 from Seattle - Tacoma Intl. to O'Hare Intl., returning Wed, Mar 25, priced at $186 found 4 days ago
Wed, Apr 1 - Sun, Apr 5
SEA
Seattle - Tacoma Intl.
ORD
O'Hare Intl.
$188 Roundtrip, found 2 days ago
$188
Roundtrip
found 2 days ago
Select American Airlines flight, departing Wed, Apr 1 from Seattle - Tacoma Intl. to O'Hare Intl., returning Sun, Apr 5, priced at $188 found 2 days ago
Tue, Mar 3 - Tue, Mar 10
SEA
Seattle - Tacoma Intl.
ORD
O'Hare Intl.
$192 Roundtrip, found 5 days ago
$192
Roundtrip
found 5 days ago
Select American Airlines flight, departing Tue, Mar 3 from Seattle - Tacoma Intl. to O'Hare Intl., returning Tue, Mar 10, priced at $192 found 5 days ago
Mon, Apr 13 - Sat, Apr 18
SEA
Seattle - Tacoma Intl.
ORD
O'Hare Intl.
$199 Roundtrip, found 12 hours ago
$199
Roundtrip
found 12 hours ago
Select American Airlines flight, departing Mon, Apr 13 from Seattle - Tacoma Intl. to O'Hare Intl., returning Sat, Apr 18, priced at $199 found 12 hours ago
Sat, Feb 7 - Sat, Feb 14
SEA
Seattle - Tacoma Intl.
ORD
O'Hare Intl.
$208 Roundtrip, found 22 hours ago
$208
Roundtrip
found 22 hours ago
Select American Airlines flight, departing Sat, Feb 7 from Seattle - Tacoma Intl. to O'Hare Intl., returning Sat, Feb 14, priced at $208 found 22 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.