$411 Find Cheap Flights from St. Louis to London Heathrow Airport - Compare and Save

Four cabin classes are available on flights from St. Louis to London Heathrow Airport:

• Economy Class
• Premium Economy Class
• Business Class
• First Class

Prices vary by airline.

A nonstop flight from St. Louis to London Heathrow Airport takes 00m, covering 4,186 miles.

Yes, a valid passport is required for this international route. Many destinations require at least six months of validity beyond your travel dates. Check your passport expiry well before booking.

Round-trip flights from St. Louis to London Heathrow Airport range from $769 to $1,330, with an average of $998 over the past 12 months. Anything below $769 counts as a good deal.

Last-minute fares on this route (booked within two weeks of departure) run 16% above the $998 route average. Book 24 weeks before departure for the lowest fares.

On this route, layover flights are cheaper than nonstop options on average. Layover fares average $907 round-trip via Philadelphia (PHL), compared to $1,050 for nonstop.

British Airways is the only airline operating St. Louis to London Heathrow Airport flights. 82% of its flights are on time.

There is no standard. Checked-bag policies vary by airline on this route. Most carriers charge $70–$100 for the first checked bag in economy. Premium fares and elite-status bookings typically include a free checked bag.

The Boeing 787-8 Dreamliner family is used most often on this route, operated mainly by British Airways and Iberia. Other aircraft seen on the route include Boeing 787 Dreamliner variants.

American Airlines is the only airline on the St. Louis to London Heathrow Airport route offering in-flight Wi-Fi. Pricing depends on fare class.

One-way fares from St. Louis to London Heathrow Airport are currently lower than usual. Average one-way flight prices are about $383, which is 29% below the typical average for this route.

London Heathrow Airport (LHR) hosts 5 major car rental companies, with daily rates averaging $39 for economy cars. Top options include:

• GREEN MOTION
• DRIVALIA
• Europcar
• Alamo
• Hertz

Flights from St. Louis to London Heathrow Airport usually depart from Lambert-St Louis (STL) and arrive at London Heathrow (LHR).

Evening flights have the fewest delays on this route, while night departures tend to have the most.

A flight is considered delayed when it departs 15 minutes or more after its scheduled time. This is the standard used by the US Department of Transportation and most airline industry reporting. On the St. Louis to London Heathrow Airport route, 18% of flights were delayed in the past 3 months, with delays averaging 1h 54m.

One-stop flights from St. Louis to London Heathrow Airport most commonly connect through:

• Chicago O'Hare Intl (ORD) - 45% of one-stop connections
• Atlanta Hartsfield-Jackson (ATL) - 19% of one-stop connections
• Toronto Pearson Intl (YYZ) - 14% of one-stop connections
• Charlotte Douglas (CLT) - 5% of one-stop connections

Yes. Flexible dates can save you up to 18% on flights from St. Louis to London Heathrow Airport. Thursday is the cheapest departure day at $940 round-trip on average, while Friday is the most expensive at $1,142, a difference of $202.

KAYAK's flexible dates feature shows options up to 3 days before and after your selected dates, making it easier to compare nearby fares.

Flying via Chicago O'Hare Intl (ORD) gives the shortest average 1-stop total travel time at 11h 42m, compared with 11h 44m via Detroit Metropolitan Wayne County (DTW) and 11h 55m via Toronto Pearson Intl (YYZ).

London Heathrow Airport is 5 hours ahead of St. Louis (British Time vs Central Time). Plan for the time shift when scheduling connections or first-day activities.

Some of the most popular sights in London Heathrow Airport are Hyde Park and Buckingham Palace. These are among the most viewed places in London Heathrow Airport on KAYAK.

Among airlines operating St. Louis to London Heathrow Airport flights:

• British Airways: offers extra legroom
• American Airlines: offers free seat selection
• Iberia: offers free seat selection
• Finnair: offers extra legroom; offers free seat selection

Extra legroom and free seat selection availability depends on fare class and route.

Here are some options for this route, based on selected ticket types and cabin classes:

• British Airways: a cabin bag and a checked bag in Economy Class
• American Airlines: a cabin bag and a checked bag in Economy Class
• Iberia: a cabin bag and a checked bag in Economy Class

Bag allowance can vary by ticket type, cabin class, route and airline, so always check the fare details before booking.