Cheap flights from Philadelphia to London from £155
This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Philadelphia to London departing on 11/7. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
Discover deals from 900+ travel sites with momondo.
Save money when you book flights with momondo
Big names, great deals
Big names, great deals
Search 100s of travel sites to compare prices.Filter for what you want
Filter for what you want
Free Wi-Fi? Stopover? Instantly customise your results.Trusted and free
Trusted and free
We’re completely free to use - no hidden charges or fees.Price Alerts
Price Alerts
Not ready to book? to track prices.Find the cheapest flights from Philadelphia to London
Cheap return flights
Cheap one-way flights
Cheap last-minute flights
Cheap direct flights
Aer Lingus flights from Philadelphia to London
Our best Aer Lingus deals on Philadelphia to London flight tickets
United Airlines flights from Philadelphia to London
Our best United Airlines deals on Philadelphia to London flight tickets
See travel insights to London from
How to get the cheapest flight ticket from Philadelphia to London
Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip
What is the typical price of a round-trip flight between Philadelphia and London?
What is the cheapest month to fly to London?
The cheapest month to fly to London from Philadelphia is in February. Flight prices, which tend to average around £489, are often lower during this time because this is during the off-season. The month of October is another great option to travel to London, with average flight prices from Philadelphia averaging around £503.
What is the cheapest day to depart on your flight to London?
Our data shows that Tuesday is the least expensive day to fly to London. Tickets to fly out on this day can be as low as £521. When flying out on a Thursday, the most expensive travel day of the week, you can expect to see flight prices from Philadelphia to London for around £739.
What is the cheapest time of day to depart on your flight to London?
The cheapest time of day to fly to London is in the morning when flights can be purchased for as low as £490. Flights at midday are often more expensive, with an average ticket price of £728.
What is the cheapest Philadelphia to London flight route?
Fly from Philadelphia to London Heathrow for the best Philadelphia - London flight prices
How far in advance should I book a flight to London?
You are more likely to see cheaper flights to London from Philadelphia when booking 18 weeks ahead of your departure date. In general, you can expect to find flights to London for around £622 when searching 18 weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to London from Philadelphia for as low as £536 on momondo.
What cabin class options are available on Philadelphia to London flights?
There are 3 cabin classes available to choose from on Philadelphia to London flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.
Can stopping save me money on Philadelphia to London flights?
No. A direct flight is the cheapest option for a flight between Philadelphia to London.
How have Philadelphia to London flight prices changed over time?
As of June 2025, prices for Philadelphia to London flights are approximately 31% more expensive when compared to flights at the same time last year.
What is the cheapest airline that flies from Philadelphia to London?
JetBlue, Air Canada, and United Airlines are the most popular carriers operating from Philadelphia to London
Which airlines fly to London?
British Airways, Lufthansa and United Airlines are the top three most popular airlines that fly to London from Philadelphia according to our data. British Airways is the first choice among our users, with 45% of people opting to fly with this airline when travelling to London. Keep in mind that there are 8 different airlines that fly to London on a routine basis, so you have a few additional options to choose from.
How many flights depart from Philadelphia to London on average per day?
As of June 2025, there are 15 flights per day flying from Philadelphia to London. The most common time of day flights depart is 18:00, with 100% of flights taking off in the evening.
How many flights depart from Philadelphia to London on average per week?
As of June 2025, 105 flights take off from Philadelphia and land in London each week. The most common flight departure day for this route is Mon, with 14% of weekly flights taking off on this day.
When to book flights from Philadelphia to London
Cheap Philadelphia to London (PHL to LON) flight deals and tips
Find info about flight duration, direct flights, and airports for your flight from Philadelphia to London
How far is Philadelphia to London by plane?
The distance between Philadelphia and London is about 3538.9 mi. A reasonable flight in good conditions will take 6h 55m.
When did momondo last update prices for flights from Philadelphia Airport to London?
Prices for flights from Philadelphia Airport to London are updated daily.
How many operators does momondo search for flights from Philadelphia Airport to London?
As of June 2025, there are 4 operators available to choose from for flights from Philadelphia Airport to London.
How old do you have to be to fly from Philadelphia Airport to London?
The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Philadelphia Airport to London.
What documentation or ID do you need to fly to London?
The travel and health documents you'll need for your trip to London may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at London. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.
What is the most popular plane model from Philadelphia to London?
Based on momondo bookings for this flight route, the most popular plane model on flight routes from Philadelphia to London is Boeing 787-9 Dreamliner (47.48% of total bookings). The next most popular plane models are Airbus A350-1000 (42.91%), Boeing 787-8 Dreamliner (3.76%), and Boeing 787 Dreamliner (3.16%).
What is the most popular airline from Philadelphia to London?
Based on momondo bookings for flights between Philadelphia and London, the leading airline is British Airways, making up 46% of the total bookings. Other popular airlines include Iberia with 29%, Aer Lingus with 15%, and JetBlue with 10%.
Best airlines flying from Philadelphia to London
Compare and see reviews for airlines that fly from Philadelphia to London with momondo
| Airline | Rating | Free Cancellation | Price | ||
|---|---|---|---|---|---|
| PriceFrom £422 | Free Cancellation | Rating 7.3 2,922 reviews | |||
| PriceFrom £429 | Free Cancellation | Rating 7.0 2,778 reviews | |||
| PriceFrom £463 | Free Cancellation | Rating 6.6 7,019 reviews | |||
| PriceFrom £487 | Free Cancellation | Rating 7.1 1,118 reviews |
Aer Lingus Flights From Philadelphia to London
The lowest priced Aer Lingus flight from Philadelphia to London from the last 72 hours was £662. Generally, Aer Lingus has 7 flights on this route every week with an average price of £1,041. Aer Lingus is rated 7.1/10 by our users.
Iberia Flights From Philadelphia to London
£583 is the best Iberia flight deal from Philadelphia to London found on momondo over the last 72 hours. The average Iberia ticket price found was closer to £720, however, with flight time and availability significantly affecting the price. Iberia (7.0/10 from 2,778 user reviews) flies into London from Philadelphia 21 times in an average week so prices can vary.
Travelling to a place near London?
Book flights to London if you plan to visit one of these locationsWhy use momondo?
Why should I use momondo to find a flight deal from Philadelphia to London?
momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Philadelphia to London. momondo saves you time and could save you money on your trip.
Can I find flights from Philadelphia to London with flexible booking policies on momondo?
Yes. All flights to London from Philadelphia on momondo can be compared and filtered by various policies on offer, including flexible booking.
How can momondo help me find flights from Philadelphia to London?
Once all potential Philadelphia to London flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.
I’m not ready to book a flight from Philadelphia to London right now. Can momondo alert me if prices change?
Yes. momondo can track prices for Philadelphia to London flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.