American Airlines Flight 21 Deals & Information (2025/2026)

Wander Wisely with exceptional service, 24/7 supportOpens in a new window

Feel at ease with free flight cancellations within 24 hours of booking

Change your flight without a fee on select flights

American Airlines Flight 21 Route Deals From $1,320

The cheapest prices found with in the last 7 days for return flights were $1,127 and $1,320 for one-way flights to Dallas-Fort Worth Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Tue, Jul 8 - Mon, Jul 14
LHR
Heathrow
DFW
Dallas-Fort Worth Intl.
$1,127 Roundtrip, found 4 days ago
$1,127
Roundtrip
found 4 days ago
Select American Airlines flight, departing Tue, Jul 8 from Heathrow to Dallas-Fort Worth Intl., returning Mon, Jul 14, priced at $1,127 found 4 days ago

Frequently asked questions

What route does flight number AA21 take?
AA21 travels between LHR and Dallas-Fort Worth Intl. Airport (DFW) and is a direct flight. This journey usually takes 10 hours and 20 minutes.
How often is AA21 on time?
If you’re traveling on American Airlines flight number AA21 between Heathrow Airport and Dallas-Fort Worth Intl. Airport (DFW), 80% of these trips touch down according to schedule. If you are delayed, you’re likely to wait about 12 minutes on average. Thanks to this airline’s top-notch service, this service has a 2.45-star rating.
What terminal does AA21 fly out of?
Travelers booked on flight number AA21 from LHR to Dallas, TX Airport (DFW-Dallas-Fort Worth Intl.) generally fly out of Terminal 5.
What kind of plane is on flight number AA21?
You’re likely to be cruising aboard a Boeing 777-300ER if you’re booked on flight number AA21. This flight almost always sets off from London Airport (LHR-Heathrow) and lands at DFW Airport.
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 AA21 flight with Travelocity, please visit our Customer Service Portal.