Cheap flights from St Louis to London

One-way fares from $386 · STL → LON · prices found by travellers in the last 48 hours

Compare all dates London → St Louis
Cheapest fare
$386

Frontier Airlines · Wed, Jan 6

Cheapest month
January

from $386

Direct flights
Not recently

Usually 1+ stop

Quickest trip
13h 16m

6,760 km

Get a price alert

We'll email you when St Louis → London drops to your price. It's free, and you can stop any time.

Today's cheapest fare is $386. We'll send one email to confirm. See our privacy policy.

Cheapest month to fly from St Louis to London

Lowest one-way fare per person in each month. Choose a month to see every date.

  1. January 2027 Cheapest $386

Cheapest dates in January 2027

The lowest fares we've seen for each day, cheapest first.

Frontier Airlines
Depart18:20 Wed, Jan 6STL → LHR 13h 16m · 2 stops
$386one way, per person
View deal
See every date in January 2027 →

Plan the rest of your trip to London

Where to stay, what to do and getting around, from our travel partners.

Where to stay

Hotels in LondonCompare places to stay on Booking.com Find hotels →

Things to do

Things to do in LondonTours, attractions and day trips on Klook Explore →

Getting around

Airport transfer in LondonPre-book a driver to meet you at arrivals, with Kiwitaxi Book a transfer → Car hire in LondonCompare rental cars from major brands on EconomyBookings Compare cars →

Stay connected

eSIM for United KingdomMobile data from the moment you land, by Airalo Get eSIM →

About flights from St Louis to London

St Louis (STL) and London (LON) are about 6,760 km apart. We haven't seen direct fares on this route recently, so expect at least one stop; the quickest journey we've seen takes about 13h 16m. Over the next few months, one-way fares start from $386, and January 2027 is currently the cheapest month to fly.

These prices come from searches travellers made in the last 48 hours, so they move quickly. If you see a good fare, it's worth booking soon. FlightsExp is free to use: you book directly with our travel partner.

Frequently asked questions

How much is a flight from St Louis to London?

The cheapest one-way fare we've seen recently is $386 with Frontier Airlines, departing Wednesday, January 6, 2027.

What is the cheapest month to fly from St Louis to London?

January 2027 currently has the lowest fares, from $386 one way.

Are there direct flights from St Louis to London?

We haven't seen direct fares recently, so most journeys include at least one stop.

How long is the flight from St Louis to London?

The quickest journey we've seen takes about 13h 16m. St Louis and London are around 6,760 km apart.

Which airlines fly from St Louis to London?

Recent fares on this route were with Frontier Airlines.

More cheap flights from St Louis

Compare flights to London from other cities →