What is the cheapest month to fly from London to Philadelphia?

Based on current 6-month forward fare data, October 2026 is the cheapest month to fly from London (LHR) to Philadelphia (PHL), with fares starting from $543.

What is the lowest current fare from LHR to PHL?

The lowest currently-listed fare from London (LHR) to Philadelphia (PHL) is $543 on 2026-10-01.

How long is the flight from London to Philadelphia?

Direct flights from LHR to PHL cover approximately 5,690 km (3,536 miles), with an estimated flight time of 6h 42m. Operating airlines: AA, BA.

Cheap flights from London to Philadelphia

Cheapest current fares: $543 in October 2026, 5,690 km direct flight in ~6h 42m.

Last updated August 11, 2026 · By Flightmaps Editorial

Cheapest month-by-month fares

Lowest available fare per calendar month from London (LHR) to Philadelphia (PHL). Refreshed daily.

London (LHR) → Philadelphia (PHL)

October 2026 $543
August 2026 $553
September 2026 $557

Frequently asked questions

What is the cheapest month to fly from London to Philadelphia?

Based on current 6-month forward fare data, October 2026 is the cheapest month to fly from London (LHR) to Philadelphia (PHL), with fares starting from $543.
What is the lowest current fare from LHR to PHL?

The lowest currently-listed fare from London (LHR) to Philadelphia (PHL) is $543 on 2026-10-01.
How long is the flight from London to Philadelphia?

Direct flights from LHR to PHL cover approximately 5,690 km (3,536 miles), with an estimated flight time of 6h 42m. Operating airlines: AA, BA.

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