$468 Find Cheap Flights from London Heathrow Airport to Philadelphia - Compare and Save

Among airlines operating London Heathrow Airport to Philadelphia flights:

• Finnair: offers free seat selection
• Iberia: offers free seat selection
• American Airlines: offers extra legroom; offers free seat selection

Extra legroom and free seat selection availability depends on fare class and route.

2 airlines operate flights between London Heathrow Airport and Philadelphia. The airlines offering nonstop flights on this route include:

• American Airlines
• British Airways

Flights from London Heathrow Airport to Philadelphia usually depart from London Heathrow (LHR) and arrive at Philadelphia (PHL).

Here are some options for this route, based on selected ticket types and cabin classes:

• British Airways: a cabin bag and a checked bag in Economy Class
• Finnair: a cabin bag and a checked bag in Economy Class
• Iberia: a cabin bag and a checked bag in Economy Class

Bag allowance can vary by ticket type, cabin class, route and airline, so travelers should check the fare details before booking.

Three cabin classes are available on flights from London Heathrow Airport to Philadelphia:

• Economy Class
• Premium Economy Class
• Business Class

On this route, layover flights are cheaper than nonstop options on average. Layover fares average $745 round-trip via Washington, D.C. Dulles Intl (IAD), compared to $906 for nonstop.

There is no standard. Checked-bag policies vary by airline on this route. Most carriers charge $74–$100 for the first checked bag in economy. Premium fares and elite-status bookings typically include a free checked bag.

The Airbus A350-1000 family is used most often on this route, operated mainly by British Airways and Finnair. Other aircraft seen on the route include Boeing 787-9 Dreamliner variants.

One-stop flights from London Heathrow Airport to Philadelphia most commonly connect through:

• Dublin (DUB) - 66% of one-stop connections
• Boston Logan Intl (BOS) - 28% of one-stop connections
• Montreal Pierre Elliott Trudeau Intl (YUL) - 3% of one-stop connections
• Frankfurt am Main (FRA) - 2% of one-stop connections

Dublin (DUB) handles the largest share of one-stop connections on this route.

Yes. Being flexible with your travel dates can save you up to 14% on the London Heathrow Airport to Philadelphia route. Tuesday is the cheapest departure day at $815 round-trip on average, while Sunday is the most expensive at $945, a difference of $130. KAYAK's flexible dates feature shows options up to 3 days before and after your selected dates, making it easier to compare nearby fares.

A flight is considered delayed when it departs 15 minutes or more after its scheduled time. This is the standard used by the US Department of Transportation and most airline industry reporting. On the London Heathrow Airport to Philadelphia route, 16% of flights were delayed in the past 3 months, with delays averaging 2 hours 30 minutes.

Morning is the busiest departure period on London Heathrow Airport to Philadelphia flights, with 50% of flights leaving in that window. Afternoon departures account for 50%, evening flights for 0%, and night flights for 0%.

Some of the most popular sights in Philadelphia are Philadelphia Convention Center, Rittenhouse Square and Philadelphia Stadium. These are among the most viewed places in Philadelphia on KAYAK.

These are the earliest and latest flight times available from London Heathrow Airport to Philadelphia:

• Earliest: departs at 9:15 am and lands at 5:17 pm
• Latest: departs at 1:45 pm and lands at 9:47 pm.

The flight takes about 8h 02m.

Last-minute fares on this route - booked within 2 weeks of departure - run 13% above the route average of $889. Book 20 weeks before departure for the lowest fares.

A nonstop flight from London Heathrow Airport to Philadelphia takes 8h 02m, covering 3,533 miles.

Yes, a valid passport is required for this international route. Many destinations require at least six months of validity beyond your travel dates. Check your passport expiry well before booking.

Yes. Based on fares seen in the past 5 days, round-trip prices on this route showed a wide range, from about $791 to $5,923. That means the highest observed fare was about 7x higher than the lowest one.

One-way fares from London Heathrow Airport to Philadelphia are currently lower than usual. Average one-way flight prices are about $535, which is 29% below the typical average for this route.

Morning flights have the fewest delays on this route. Delays tend to pile up throughout the day as one late flight pushes the next, so earlier departures are usually more reliable.

Flying via Dublin (DUB) gives the shortest average 1-stop total travel time at 10h 54m, compared with 11h 58m via Washington, D.C. Dulles Intl (IAD) and 11h 59m via Montreal Pierre Elliott Trudeau Intl (YUL).

Philadelphia is 5 hours behind London Heathrow Airport (Eastern Time vs British Time). Plan for the time shift when scheduling connections or first-day activities.

Philadelphia Airport (PHL) hosts 5 major car rental companies, with daily rates starting from around $28 for economy cars. Top options include:
• Payless
• Dollar
• Hertz
• Thrifty
• Budget

Round-trip flights from London Heathrow Airport to Philadelphia range from $748 to $1,065, with an average of $889 over the past 12 months. Anything below $748 counts as a good deal.

American Airlines is the only airline on the London Heathrow Airport to Philadelphia route offering in-flight Wi-Fi. Pricing depends on fare class.