Title: £499 Cheap United flights from London to St. Louis (LHR→STL) - Expedia.co.uk

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# £499 Cheap United flights from London to St. Louis (LHR→STL)

[View £499 flight on Wed, 2 Sept 2026](https://expedia.co.uk/Flights-Search?trip=oneway&leg1=from:LHR,to:STL,departure:02/09/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:498.09&airProductToken=AQpsCjQI1YIBEgM5MDUY64kBIMSNASje2ZYDML7dlgM4S0AAWAFqB0VDT05PTVlyCEtKT0lLWU5DCjQI1YIBEgQzNzE3GMSNASDyXCiY3pYDML_flgM4S0ABWAFqB0VDT05PTVlyCEtKT0lLWU5DEgoIARABGAEqAlVBGAEiBAgBEAEoAigDKAQwAQ) 

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## United flights from London to St. Louis (LHR→STL)

Prices were available within the past 7 days and start at £499 for one-way flights and £931 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

All deals

One way

Return

![United](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/UA.gif)

Sun, 20 Sept - Tue, 6 Oct

LHR

London

STL

St. Louis

£931

Return

found 3 hours ago

[](https://expedia.co.uk/Flights-Search?trip=roundtrip&leg1=from:LHR,to:STL,departure:20/09/2026TANYT&leg2=from:STL,to:LHR,departure:06/10/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:930.85&airProductToken=AQqFAQpBCNWCARIEODgxMBjriQEgpQQonqSYAzD9pJgDOEtAAFgBaghFQ09CQVNJQ3IIS0pWSEtYQlF6CgjMkAESBDg4MTAKQAjVggESBDkwNjYYpQQg8lwoyK-YAzCRtJgDOEtAAVgBaghFQ09CQVNJQ3IIS0pWSEtYQlF6CgjMkAESBDkwNjYKbAo0CNWCARIENDc0NxjyXCCuHCjf3ZkDMLfemQM4S0AAWAFqCEVDT0JBU0lDcghLSlZIS1hCUQo0CNWCARIDOTIwGK4cIOuJASin35kDMKDjmQM4S0ABWAFqCEVDT0JBU0lDcghLSlZIS1hCURIKCAEQARgBKgJVQRgBIgQIARABKAIoAygEMAE)

## Alternative airports near St. Louis

Prices were available within the past 7 days. Prices and availability are subject to change.

[](https://www.expedia.co.uk/Flights-Search?leg1=from:LHR,to:STL,departure:13/04/2026TANYT&leg2=from:STL,to:LHR,departure:20/04/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&sortOrder=INCREASING&sortType=PRICE)

STL

Lambert-St. Louis Intl.

Cheapest

20 min

[Flights from £719

](https://www.expedia.co.uk/Flights-Search?leg1=from:LHR,to:STL,departure:13/04/2026TANYT&leg2=from:STL,to:LHR,departure:20/04/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&sortOrder=INCREASING&sortType=PRICE) 

## Find the cheapest month to fly from London (LHR) to St. Louis (STL)

### November is typically the cheapest month to fly

From £522 - £1,128 per traveller.

## Travel information

| Origin airport      | Heathrow                                                                                                                                                                                        |
| ------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| Destination airport | Lambert-St. Louis Intl.                                                                                                                                                                         |
| Airlines serving    | Aer Lingus, Air Canada, Air France, American Airlines, Austrian Airlines, British Airways, Brussels Airlines, Delta, Finnair, Iberia, KLM, Lufthansa, Turkish Airlines, United, Virgin Atlantic |
| Popular airline     | KLM                                                                                                                                                                                             |
| Distance            | 6703 km                                                                                                                                                                                         |

\*Available to Expedia members.