
Most accurate provider | eDreams 3 stars |
|---|---|
Most trusted provider | eDreams 3 stars |
Round-trip from | $656 (Cheapflightsfares) |
One-way from | $277 (Kiwi.com) |
Popular in | June |
Cheapest in | October |
Average price | $1,000 |
Good round-trip deal | $675 or less |
Good one-way deal | $280 or less |
Fly from
Fly to
Route
Depart
Return
Price
St. LouisLondon
STL - LHR
STLLHR
Lambert-St Louis
jue. 12/11
6:42 pm-11:15 am
1 stop10h 33m
London Heathrow
mar. 12/16
10:25 am-5:03 pm
1 stop12h 38m
St. LouisLondon
STL - LHR
STLLHR
Lambert-St Louis
vie. 2/6
6:40 pm-11:15 am
1 stop10h 35m
London Heathrow
mié. 2/11
6:30 am-10:58 pm
2 stops22h 28m
St. LouisLondon
STL - LHR
STLLHR
Lambert-St Louis
dom. 2/1
6:40 pm-11:15 am
1 stop10h 35m
London Heathrow
dom. 2/8
8:30 am-10:58 pm
2 stops20h 28m
St. LouisLondon
STL - LHR
STLLHR
Lambert-St Louis
dom. 1/18
11:20 am-7:10 am
2 stops13h 50m
London Heathrow
mié. 4/1
1:30 pm-10:59 pm
2 stops15h 29m
St. LouisLondon
STL - LHR
STLLHR
Lambert-St Louis
jue. 12/11
12:49 pm-7:05 am
1 stop12h 16m
London Heathrow
mar. 12/16
6:30 am-4:35 pm
2 stops40h 05m
St. LouisLondon
STL - LHR
STLLHR
Lambert-St Louis
jue. 1/15
12:44 pm-10:50 am
1 stop16h 06m
London Heathrow
lun. 1/26
6:30 pm-5:43 pm
2 stops29h 13m
St. LouisLondon
STL - LHR
STLLHR
Lambert-St Louis
dom. 1/18
12:00 pm-6:55 am
2 stops12h 55m
London Heathrow
mié. 4/1
10:55 am-8:41 pm
2 stops15h 46m
St. LouisLondon
STL - LHR
STLLHR
Lambert-St Louis
vie. 1/30
6:40 pm-11:15 am
1 stop10h 35m
London Heathrow
mar. 2/3
6:50 am-5:43 pm
2 stops16h 53m
St. LouisLondon
STL - LHR
STLLHR
Lambert-St Louis
jue. 2/5
6:40 pm-11:15 am
1 stop10h 35m
London Heathrow
vie. 2/13
6:35 am-5:45 pm
2 stops17h 10m
St. LouisLondon
STL - LHR
STLLHR
Lambert-St Louis
jue. 1/15
8:05 am-11:15 am
1 stop21h 10m
London Heathrow
mar. 1/20
6:50 am-7:27 pm
2 stops18h 37m
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*1 star | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*2 stars | |
| Price Accuracy3 stars | Trust Score*2 stars | |
| Price Accuracy- | Trust Score*1 star | |
| Price Accuracy- | Trust Score*1 star |
To ensure you get the cheapest price possible for a flight from St. Louis to London Heathrow Airport, you should look to book at least 27 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.
Currently, September is the cheapest month in which you can book a flight from St. Louis to London Heathrow Airport (average of $530). Flying from St. Louis to London Heathrow Airport in June is currently the most expensive (average of $1,001). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
One of the essential ways to save on airfare from St. Louis to London Heathrow Airport is to remain as flexible as possible. Flights that are in the morning tend to be the most expensive. A flight in the evening could potentially save you up to 23% on airfare.
Travelers seeking maximum savings on their St. Louis to London Heathrow Airport flight should consider departing on Monday evenings when fares are most often at their lowest. Sunday mornings flights should be avoided if possible as fares are typically the most expensive at this time.
Chicago (ORD) – chosen by Cheapflights users on 57% of 1-stop itineraries from St. Louis to London Heathrow Airport on Cheapflights.
Frankfurt am Main (FRA) is the most affordable 1-stop option, with an average round-trip price of $797.
Flights via Chicago (ORD) have the shortest average one-way travel time for 1-stop routes: 10h 06m.
Flights via Chicago (ORD) offer the fastest connection on this route, with an average layover time of 1h 31m.
Boarding
Crew
Overall
Entertainment
Food
Comfort
Reviews
Sunderesh,Dec 2025
AUS - EWR
Boarding
Crew
Overall
Entertainment
Food
Comfort
Reviews
Sunderesh,Dec 2025
AUS - EWR
Boarding
Crew
Overall
Entertainment
Food
Comfort
Reviews
Sunderesh,Dec 2025
AUS - EWR
Boarding
Crew
Overall
Entertainment
Food
Comfort
Reviews
Sunderesh,Dec 2025
AUS - EWR
Boarding
Crew
Overall
Entertainment
Food
Comfort
Reviews
Sunderesh,Dec 2025
AUS - EWR
Boarding
Crew
Overall
Entertainment
Food
Comfort
Reviews
Sunderesh,Dec 2025
AUS - EWR
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$529 | Average$736 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$573 | Average$945 | FlexibilityNo cancel fee | On-time67% | |
| Cheapest$577 | Average$870 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$580 | Average$867 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$580 | Average$864 | FlexibilityNo cancel fee | On-time70% | |
| Cheapest$597 | Average$971 | FlexibilityNo cancel fee | On-time77% | |
| Cheapest$602 | Average$987 | FlexibilityNo cancel fee | On-time77% | |
| Cheapest$615 | Average$947 | FlexibilityNo cancel fee | On-time72% | |
| Cheapest$634 | Average$890 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$670 | Average$898 | FlexibilityNo cancel fee | On-time76% |