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

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British Airways Flight 503 Route Deals From $101

The cheapest prices found with in the last 7 days for return flights were $172 and $101 for one-way flights to Heathrow for the period specified. Prices and availability are subject to change. Additional terms apply.

Sat, Nov 14 - Wed, Nov 18
LIS
Humberto Delgado
LHR
Heathrow
$172 Roundtrip, found 3 hours ago
$172
Roundtrip
found 3 hours ago
Select British Airways flight, departing Sat, Nov 14 from Humberto Delgado to Heathrow, returning Wed, Nov 18, priced at $172 found 3 hours ago
Sat, Nov 14 - Sun, Nov 15
LIS
Humberto Delgado
LHR
Heathrow
$192 Roundtrip, found 12 hours ago
$192
Roundtrip
found 12 hours ago
Select British Airways flight, departing Sat, Nov 14 from Humberto Delgado to Heathrow, returning Sun, Nov 15, priced at $192 found 12 hours ago
Thu, Jan 21 - Mon, Jan 25
LIS
Humberto Delgado
LHR
Heathrow
$202 Roundtrip, found 4 hours ago
$202
Roundtrip
found 4 hours ago
Select British Airways flight, departing Thu, Jan 21 from Humberto Delgado to Heathrow, returning Mon, Jan 25, priced at $202 found 4 hours ago
Thu, Jan 21 - Mon, Jan 25
LIS
Humberto Delgado
LHR
Heathrow
$203 Roundtrip, found 4 hours ago
$203
Roundtrip
found 4 hours ago
Select British Airways flight, departing Thu, Jan 21 from Humberto Delgado to Heathrow, returning Mon, Jan 25, priced at $203 found 4 hours ago
Thu, Jan 14 - Sun, Jan 17
LIS
Humberto Delgado
LHR
Heathrow
$204 Roundtrip, found 16 hours ago
$204
Roundtrip
found 16 hours ago
Select British Airways flight, departing Thu, Jan 14 from Humberto Delgado to Heathrow, returning Sun, Jan 17, priced at $204 found 16 hours ago
Fri, Jan 15 - Mon, Jan 18
LIS
Humberto Delgado
LHR
Heathrow
$206 Roundtrip, found 1 day ago
$206
Roundtrip
found 1 day ago
Select British Airways flight, departing Fri, Jan 15 from Humberto Delgado to Heathrow, returning Mon, Jan 18, priced at $206 found 1 day ago
Sat, Nov 14 - Wed, Nov 18
LIS
Humberto Delgado
LHR
Heathrow
$208 Roundtrip, found 3 hours ago
$208
Roundtrip
found 3 hours ago
Select British Airways flight, departing Sat, Nov 14 from Humberto Delgado to Heathrow, returning Wed, Nov 18, priced at $208 found 3 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.