Cheap flights from Philadelphia to London from $1,357 PHL → LHR, STN
Philadelphia International Airport (PHL) → London Heathrow Airport (LHR), Stansted Airport (STN)
The cheapest return found recently is $1,357 with United Airlines, 20 Nov – 27 Nov, found 2 days ago.
- Cheapest return found recently
- $1,357, 20 Nov to 27 Nov
- Usual return price
- $1,145 to $1,421
- Cheapest month to fly
- April 2027, return fares from $932 found in the last 7 days
Return
The cheapest return fare on each of 3 departure dates is usually $1,145 to $1,421.
Cheapest return found recently
$1,357
20 Nov – 27 Nov · United Airlines
Philadelphia International Airport (PHL) → London Heathrow Airport (LHR)
Leaves 3:20 p.m. · Return leaves 1:00 p.m. · 55 h 19 min of travel, both ways together
out 2 stops, back 1 stop
found 2 days ago
Cheapest nonstop return
None seen yet.
Found recently, and the cheapest we hold
$1,357 20 Nov – 27 Novfound 2 days agoSee prices for these dates
$932 14 Apr 2027 – 26 Apr 2027found 5 days agoSee prices for these dates
What have prices looked like?
Over 43 days, 24 Sept to 11 Nov, the cheapest return we saw each day was $544 to $1,112.
At $1,357, the cheapest return found recently is above that range.
Those were the prices on those days, not today's.
Is this a good return price?
Compared with the cheapest return fare on each of 3 departure dates from 20 Nov to 14 Apr 2027, found by travelers' searches in the last 7 days (economy, the price the seller showed on Aviasales). The usual range is the middle half of those prices.
Could nearby dates be cheaper?
We hold no other 7-night return fares leaving within 3 days of 20 Nov to compare.
Every date we hold
3 fares on 3 departure dates
See the chart as a table
| Dates | From | Airline | Airports | Stops | Found | |
|---|---|---|---|---|---|---|
| 20 Nov – 27 Nov | $1,357 | United Airlines | Philadelphia International Airport (PHL) → London Heathrow Airport (LHR) | out 2 stops, back 1 stop | found 2 days ago | See prices for these dates |
| 19 Dec – 24 Dec | $1,485 | Frontier Airlines | Philadelphia International Airport (PHL) → Stansted Airport (STN) | out 3 stops, back 1 stop | found 3 days ago | See prices for these dates |
| 14 Apr 2027 – 26 Apr 2027 | $932 | Aer Lingus | Philadelphia International Airport (PHL) → London Heathrow Airport (LHR) | out 1 stop, back 3 stops | found 5 days ago | See prices for these dates |
Which month looks cheapest?
April 2027 is the cheapest month — from $932.
Airlines on the cheapest dates: United Airlines, Frontier Airlines, Aer Lingus.
Premium cabin fares from Philadelphia to London
We hold no premium economy, business or first-class fares for this route: we collect them for the busiest routes, and this one is not among them yet.
Today's prices for 20 Nov – 27 Nov in another cabin: Premium economy · Business · First
How far ahead were prices cheapest for Philadelphia to London?
Return
Fares 14 to 29 days before departure were typically 22% lower than 7 to 13 days before departure.
From the cheapest return each day between 24 Sept and 11 Nov (43 days), grouped by how many days ahead the flight left; one adult in economy.
Each range covers different departure dates, so this compares typical fares, not the same trip priced twice.
Prices reflect recent searches — current fares may differ.
See these ranges as a table
| Booked ahead by | Typical fare | Cheapest day | Above the cheapest | Days of prices |
|---|---|---|---|---|
| 7–13 days | $953 | $894 | +27% | 8 |
| 14–29 days | $748 | $544 | Cheapest seen | 25 |
| 30–59 days | $944 | $544 | +26% | 19 |
| 60–89 days | $976 | $840 | +31% | 16 |
| 90–179 days | $893 | $846 | +19% | 22 |
Could a nearby airport be cheaper?
A different airport at either end can change the fare — sometimes a lot.
Return
New York → London
130 km from Philadelphia
$459
$898 less than flying from Philadelphia
8 Mar 2027 – 15 Mar 2027 · JFK → LTN · out 2 stops, back 2 stops
found yesterday
Baltimore → London
145 km from Philadelphia
$754
$603 less than flying from Philadelphia
3 Dec – 13 Dec · BWI → LHR · out 1 stop, back 1 stop
found 2 days ago
Cheapest recent price on each route — round trip, per traveler in Economy. Distances are in a straight line.
One-way
New York → London
130 km from Philadelphia
$255
22 Feb 2027 · JFK → LHR · 1 stop
found 2 days ago
Baltimore → London
145 km from Philadelphia
$434
1 Jul 2027 · BWI → LHR · 1 stop
found 3 days ago
Cheapest recent price on each route — one way, per traveler in Economy. Distances are in a straight line.
Live price for these dates
The cheapest return found recently is for 20 Nov – 27 Nov. A live search on this page shows what those dates cost now, for one adult in economy.
Questions about this trip
How much is a return flight from Philadelphia to London?
The cheapest return found recently is $1,357 with United Airlines, 20 Nov to 27 Nov, found 2 days ago. The cheapest return we hold, of any age, is $932 with Aer Lingus, 14 Apr 2027 to 26 Apr 2027, found 5 days ago. The cheapest return fare on each of 3 departure dates is usually $1,145 to $1,421.
What is the cheapest month to fly from Philadelphia to London?
April 2027 is the cheapest month for a return, from $932, 14 Apr 2027 to 26 Apr 2027, found 5 days ago.
How far ahead should I book a flight from Philadelphia to London?
In 43 days of prices between 24 Sept and 11 Nov, return fares 14 to 29 days before departure were typically 22% lower than 7 to 13 days before departure.
Which airlines have the cheapest flights from Philadelphia to London?
Between 20 Nov and 14 Apr 2027, United Airlines has the cheapest return on 1 of the 3 departure dates we hold, Frontier Airlines on 1 and Aer Lingus on 1.
Prices are what travelers' searches on Aviasales found in the last 7 days, in US dollars: the price the seller showed on Aviasales; bags may cost extra. Fares change, so check today's price before you book. How our prices work