St. Louis, MO to London, United Kingdom flights
Flights starting at $342. Choose between Delta Air Lines, Spirit Airlines, or Frontier Airlines to find the best price.

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Tips to know when travelling to London
Cheapest one-way trip | $342 |
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Cheapest nonstop round-trip | $1124 |
Cheapest round-trip | $960 |
Average round-trip | $1132 |
Includes rare itinerary | Travel hack |
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Check-in for a flight from St. Louis to London
Name | Carrier code | IATA Code | Passport needed during booking | Online check-in available |
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Delta Air Lines | DAL | DL | Yes | Opens 24 days before flight Closes 1 hours before flight |
Spirit Airlines | NKS | NK | No | Opens 24 days before flight Closes 1 hours before flight |
Frontier Airlines | FFT | F9 | No | Opens 24 days before flight Closes 1 hours before flight |
Ryanair | RYR | FR | No | Opens 24 days before flight Closes 2 hours before flight |
WestJet | WJA | WS | No | Opens 24 days before flight Closes 1 hours before flight |
United Kingdom COVID-19 travel restrictions

Most travelers from St Louis, STL can enter London, LGW, but there are restrictions.
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Information is provided as guidance only and accurate at the time of publishing. Always check government websites and airline materials before booking and traveling.
Learn more about COVID-19 restrictions in United Kingdom in our dedicated Stories article.
Frequently asked questions
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