British Airways Flight 503 Deals & Information (2025/2026)

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British Airways Flight 503 Route Deals From $67

The cheapest prices found with in the last 7 days for return flights were $141 and $67 for one-way flights to Heathrow for the period specified. Prices and availability are subject to change. Additional terms apply.

Fri, Dec 12 - Mon, Dec 15
LIS
Humberto Delgado
LHR
Heathrow
$141 Roundtrip, found 6 days ago
$141
Roundtrip
found 6 days ago
Select British Airways flight, departing Fri, Dec 12 from Humberto Delgado to Heathrow, returning Mon, Dec 15, priced at $141 found 6 days ago
Thu, Dec 25 - Tue, Dec 30
LIS
Humberto Delgado
LHR
Heathrow
$150 Roundtrip, found 4 days ago
$150
Roundtrip
found 4 days ago
Select British Airways flight, departing Thu, Dec 25 from Humberto Delgado to Heathrow, returning Tue, Dec 30, priced at $150 found 4 days ago
Mon, Dec 1 - Thu, Dec 4
LIS
Humberto Delgado
LHR
Heathrow
$156 Roundtrip, found 6 days ago
$156
Roundtrip
found 6 days ago
Select British Airways flight, departing Mon, Dec 1 from Humberto Delgado to Heathrow, returning Thu, Dec 4, priced at $156 found 6 days ago
Thu, Dec 25 - Tue, Dec 30
LIS
Humberto Delgado
LHR
Heathrow
$160 Roundtrip, found 4 days ago
$160
Roundtrip
found 4 days ago
Select British Airways flight, departing Thu, Dec 25 from Humberto Delgado to Heathrow, returning Tue, Dec 30, priced at $160 found 4 days ago
Wed, Jan 14 - Thu, Jan 15
LIS
Humberto Delgado
LHR
Heathrow
$168 Roundtrip, found 10 hours ago
$168
Roundtrip
found 10 hours ago
Select British Airways flight, departing Wed, Jan 14 from Humberto Delgado to Heathrow, returning Thu, Jan 15, priced at $168 found 10 hours ago
Fri, Nov 7 - Tue, Nov 11
LIS
Humberto Delgado
LHR
Heathrow
$169 Roundtrip, found 2 days ago
$169
Roundtrip
found 2 days ago
Select British Airways flight, departing Fri, Nov 7 from Humberto Delgado to Heathrow, returning Tue, Nov 11, priced at $169 found 2 days ago
Mon, Nov 24 - Tue, Dec 2
LIS
Humberto Delgado
LHR
Heathrow
$174 Roundtrip, found 4 days ago
$174
Roundtrip
found 4 days ago
Select British Airways flight, departing Mon, Nov 24 from Humberto Delgado to Heathrow, returning Tue, Dec 2, priced at $174 found 4 days ago
Mon, Dec 1 - Thu, Dec 4
LIS
Humberto Delgado
LHR
Heathrow
$184 Roundtrip, found 6 days ago
$184
Roundtrip
found 6 days ago
Select British Airways flight, departing Mon, Dec 1 from Humberto Delgado to Heathrow, returning Thu, Dec 4, priced at $184 found 6 days ago
Mon, Nov 24 - Tue, Dec 2
LIS
Humberto Delgado
LHR
Heathrow
$189 Roundtrip, found 4 days ago
$189
Roundtrip
found 4 days ago
Select British Airways flight, departing Mon, Nov 24 from Humberto Delgado to Heathrow, returning Tue, Dec 2, priced at $189 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.