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

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British Airways Flight 503 Route Deals From $114

The cheapest prices found with in the last 7 days for return flights were $197 and $114 for one-way flights to Heathrow for the period specified. Prices and availability are subject to change. Additional terms apply.

Wed, Dec 23 - Tue, Jan 12
LIS
Humberto Delgado
LHR
Heathrow
$197 Roundtrip, found 5 days ago
$197
Roundtrip
found 5 days ago
Select British Airways flight, departing Wed, Dec 23 from Humberto Delgado to Heathrow, returning Tue, Jan 12, priced at $197 found 5 days ago
Thu, Oct 22 - Sat, Oct 31
LIS
Humberto Delgado
LHR
Heathrow
$200 Roundtrip, found 9 hours ago
$200
Roundtrip
found 9 hours ago
Select British Airways flight, departing Thu, Oct 22 from Humberto Delgado to Heathrow, returning Sat, Oct 31, priced at $200 found 9 hours ago
Thu, Oct 22 - Sat, Oct 31
LIS
Humberto Delgado
LHR
Heathrow
$207 Roundtrip, found 9 hours ago
$207
Roundtrip
found 9 hours ago
Select British Airways flight, departing Thu, Oct 22 from Humberto Delgado to Heathrow, returning Sat, Oct 31, priced at $207 found 9 hours ago
Thu, Oct 22 - Sat, Oct 31
LIS
Humberto Delgado
LHR
Heathrow
$208 Roundtrip, found 9 hours ago
$208
Roundtrip
found 9 hours ago
Select British Airways flight, departing Thu, Oct 22 from Humberto Delgado to Heathrow, returning Sat, Oct 31, priced at $208 found 9 hours ago
Thu, Oct 22 - Sat, Oct 31
LIS
Humberto Delgado
LHR
Heathrow
$209 Roundtrip, found 9 hours ago
$209
Roundtrip
found 9 hours ago
Select British Airways flight, departing Thu, Oct 22 from Humberto Delgado to Heathrow, returning Sat, Oct 31, priced at $209 found 9 hours ago
Thu, Oct 22 - Sat, Oct 31
LIS
Humberto Delgado
LHR
Heathrow
$210 Roundtrip, found 9 hours ago
$210
Roundtrip
found 9 hours ago
Select British Airways flight, departing Thu, Oct 22 from Humberto Delgado to Heathrow, returning Sat, Oct 31, priced at $210 found 9 hours ago
Thu, Jan 14 - Wed, Jan 20
LIS
Humberto Delgado
LHR
Heathrow
$211 Roundtrip, found 1 day ago
$211
Roundtrip
found 1 day ago
Select British Airways flight, departing Thu, Jan 14 from Humberto Delgado to Heathrow, returning Wed, Jan 20, priced at $211 found 1 day ago
Thu, Oct 22 - Sat, Oct 31
LIS
Humberto Delgado
LHR
Heathrow
$212 Roundtrip, found 9 hours ago
$212
Roundtrip
found 9 hours ago
Select British Airways flight, departing Thu, Oct 22 from Humberto Delgado to Heathrow, returning Sat, Oct 31, priced at $212 found 9 hours ago
Thu, Oct 22 - Sat, Oct 31
LIS
Humberto Delgado
LHR
Heathrow
$218 Roundtrip, found 9 hours ago
$218
Roundtrip
found 9 hours ago
Select British Airways flight, departing Thu, Oct 22 from Humberto Delgado to Heathrow, returning Sat, Oct 31, priced at $218 found 9 hours 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.