British Airways Flight AA1543 Deals & Information (2025/2026)

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British Airways Flight 1543 Route Deals From $388

The cheapest prices found with in the last 7 days for return flights were $493 and $388 for one-way flights to Heathrow for the period specified. Prices and availability are subject to change. Additional terms apply.

Mon, Aug 4 - Fri, Aug 15
ORD
O'Hare Intl.
LHR
Heathrow
$493 Roundtrip, found 15 hours ago
$493
Roundtrip
found 15 hours ago
Select British Airways flight, departing Mon, Aug 4 from O'Hare Intl. to Heathrow, returning Fri, Aug 15, priced at $493 found 15 hours ago
Tue, Aug 5 - Fri, Aug 15
ORD
O'Hare Intl.
LHR
Heathrow
$498 Roundtrip, found 1 day ago
$498
Roundtrip
found 1 day ago
Select British Airways flight, departing Tue, Aug 5 from O'Hare Intl. to Heathrow, returning Fri, Aug 15, priced at $498 found 1 day ago
Sat, Aug 2 - Fri, Aug 15
ORD
O'Hare Intl.
LHR
Heathrow
$509 Roundtrip, found 5 hours ago
$509
Roundtrip
found 5 hours ago
Select British Airways flight, departing Sat, Aug 2 from O'Hare Intl. to Heathrow, returning Fri, Aug 15, priced at $509 found 5 hours ago
Tue, Aug 12 - Mon, Aug 25
ORD
O'Hare Intl.
LHR
Heathrow
$510 Roundtrip, found 21 hours ago
$510
Roundtrip
found 21 hours ago
Select British Airways flight, departing Tue, Aug 12 from O'Hare Intl. to Heathrow, returning Mon, Aug 25, priced at $510 found 21 hours ago
Wed, Jul 30 - Mon, Aug 11
ORD
O'Hare Intl.
LHR
Heathrow
$514 Roundtrip, found 14 hours ago
$514
Roundtrip
found 14 hours ago
Select British Airways flight, departing Wed, Jul 30 from O'Hare Intl. to Heathrow, returning Mon, Aug 11, priced at $514 found 14 hours ago
Wed, Aug 20 - Mon, Sep 1
ORD
O'Hare Intl.
LHR
Heathrow
$516 Roundtrip, found 2 days ago
$516
Roundtrip
found 2 days ago
Select British Airways flight, departing Wed, Aug 20 from O'Hare Intl. to Heathrow, returning Mon, Sep 1, priced at $516 found 2 days ago