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

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British Airways Flight 503 Route Deals From $97

The cheapest prices found with in the last 7 days for return flights were $167 and $97 for one-way flights to Heathrow for the period specified. Prices and availability are subject to change. Additional terms apply.

Fri, Feb 6 - Tue, Feb 10
LIS
Humberto Delgado
LHR
Heathrow
$167 Roundtrip, found 2 days ago
$167
Roundtrip
found 2 days ago
Select British Airways flight, departing Fri, Feb 6 from Humberto Delgado to Heathrow, returning Tue, Feb 10, priced at $167 found 2 days ago
Thu, Nov 13 - Wed, Nov 19
LIS
Humberto Delgado
LHR
Heathrow
$169 Roundtrip, found 2 days ago
$169
Roundtrip
found 2 days ago
Select British Airways flight, departing Thu, Nov 13 from Humberto Delgado to Heathrow, returning Wed, Nov 19, priced at $169 found 2 days ago
Sat, Nov 22 - Sun, Nov 23
LIS
Humberto Delgado
LHR
Heathrow
$170 Roundtrip, found 2 days ago
$170
Roundtrip
found 2 days ago
Select British Airways flight, departing Sat, Nov 22 from Humberto Delgado to Heathrow, returning Sun, Nov 23, priced at $170 found 2 days ago
Tue, Jan 13 - Thu, Jan 15
LIS
Humberto Delgado
LHR
Heathrow
$175 Roundtrip, found 1 day ago
$175
Roundtrip
found 1 day ago
Select British Airways flight, departing Tue, Jan 13 from Humberto Delgado to Heathrow, returning Thu, Jan 15, priced at $175 found 1 day ago
Wed, Feb 4 - Fri, Feb 6
LIS
Humberto Delgado
LHR
Heathrow
$175 Roundtrip, found 2 days ago
$175
Roundtrip
found 2 days ago
Select British Airways flight, departing Wed, Feb 4 from Humberto Delgado to Heathrow, returning Fri, Feb 6, priced at $175 found 2 days ago
Tue, Jan 13 - Wed, Jan 14
LIS
Humberto Delgado
LHR
Heathrow
$176 Roundtrip, found 4 days ago
$176
Roundtrip
found 4 days ago
Select British Airways flight, departing Tue, Jan 13 from Humberto Delgado to Heathrow, returning Wed, Jan 14, priced at $176 found 4 days ago
Mon, Jan 12 - Thu, Jan 15
LIS
Humberto Delgado
LHR
Heathrow
$177 Roundtrip, found 3 days ago
$177
Roundtrip
found 3 days ago
Select British Airways flight, departing Mon, Jan 12 from Humberto Delgado to Heathrow, returning Thu, Jan 15, priced at $177 found 3 days ago
Sun, Jan 11 - Tue, Jan 13
LIS
Humberto Delgado
LHR
Heathrow
$178 Roundtrip, found 4 days ago
$178
Roundtrip
found 4 days ago
Select British Airways flight, departing Sun, Jan 11 from Humberto Delgado to Heathrow, returning Tue, Jan 13, priced at $178 found 4 days ago
Wed, Feb 4 - Fri, Feb 6
LIS
Humberto Delgado
LHR
Heathrow
$180 Roundtrip, found 2 days ago
$180
Roundtrip
found 2 days ago
Select British Airways flight, departing Wed, Feb 4 from Humberto Delgado to Heathrow, returning Fri, Feb 6, priced at $180 found 2 days ago
Mon, Jan 12 - Thu, Jan 15
LIS
Humberto Delgado
LHR
Heathrow
$181 Roundtrip, found 3 days ago
$181
Roundtrip
found 3 days ago
Select British Airways flight, departing Mon, Jan 12 from Humberto Delgado to Heathrow, returning Thu, Jan 15, priced at $181 found 3 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.