British Airways Flight 503 Deals & Information (2026/2027)

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British Airways Flight 503 Route Deals From $104

The cheapest prices found with in the last 7 days for return flights were $189 and $104 for one-way flights to Heathrow for the period specified. Prices and availability are subject to change. Additional terms apply.

Fri, Nov 27 - Sun, Feb 7
LIS
Humberto Delgado
LHR
Heathrow
$189 Roundtrip, found 4 days ago
$189
Roundtrip
found 4 days ago
Select British Airways flight, departing Fri, Nov 27 from Humberto Delgado to Heathrow, returning Sun, Feb 7, priced at $189 found 4 days ago
Fri, Nov 27 - Sun, Feb 7
LIS
Humberto Delgado
LHR
Heathrow
$193 Roundtrip, found 4 days ago
$193
Roundtrip
found 4 days ago
Select British Airways flight, departing Fri, Nov 27 from Humberto Delgado to Heathrow, returning Sun, Feb 7, priced at $193 found 4 days ago
Fri, Nov 27 - Sun, Feb 7
LIS
Humberto Delgado
LHR
Heathrow
$195 Roundtrip, found 4 days ago
$195
Roundtrip
found 4 days ago
Select British Airways flight, departing Fri, Nov 27 from Humberto Delgado to Heathrow, returning Sun, Feb 7, priced at $195 found 4 days ago
Fri, Nov 27 - Sun, Feb 7
LIS
Humberto Delgado
LHR
Heathrow
$201 Roundtrip, found 4 days ago
$201
Roundtrip
found 4 days ago
Select British Airways flight, departing Fri, Nov 27 from Humberto Delgado to Heathrow, returning Sun, Feb 7, priced at $201 found 4 days ago
Sun, Nov 29 - Sat, Dec 5
LIS
Humberto Delgado
LHR
Heathrow
$202 Roundtrip, found 5 days ago
$202
Roundtrip
found 5 days ago
Select British Airways flight, departing Sun, Nov 29 from Humberto Delgado to Heathrow, returning Sat, Dec 5, priced at $202 found 5 days ago
Tue, Nov 10 - Fri, Nov 13
LIS
Humberto Delgado
LHR
Heathrow
$203 Roundtrip, found 4 days ago
$203
Roundtrip
found 4 days ago
Select British Airways flight, departing Tue, Nov 10 from Humberto Delgado to Heathrow, returning Fri, Nov 13, priced at $203 found 4 days ago
Fri, Nov 27 - Sun, Feb 7
LIS
Humberto Delgado
LHR
Heathrow
$204 Roundtrip, found 4 days ago
$204
Roundtrip
found 4 days ago
Select British Airways flight, departing Fri, Nov 27 from Humberto Delgado to Heathrow, returning Sun, Feb 7, priced at $204 found 4 days ago

Frequently asked questions

What route does flight number BA503 take?
BA503 travels from LIS to Heathrow Airport (LHR) and flies direct. This trip takes 2 hours and 40 minutes.
What terminal does BA503 fly out of?
Direct flights to and from Humberto Delgado Airport (LIS) and LHR are served by BA503, and travelers with a seat booked on this flight typically depart from Terminal 1.
What kind of plane is on flight number BA503?
The Airbus A320 is the kind of plane most frequently used for flight number BA503. Typically, this flight heads off from Lisbon Airport (LIS-Humberto Delgado) and touches down at Heathrow 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 BA503 flight with Travelocity, please visit our Customer Service Portal.