$589 Cheap Flights from St. Louis (STL) to Southampton (SOU)

View $589 flight on Tue, Jul 7, 2026Opens in a new window

Popular airlines from St. Louis Lambert Intl. Airport (STL) to Southampton (SOU)

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Cheap Flights from St. Louis to Southampton (STL-SOU)

Prices were available within the past 7 days and start at $589 for one-way flights and $1,011 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Aer Lingus
Thu, Dec 11 - Thu, Dec 18
STL
St. Louis
SOU
Southampton
$1,011 Roundtrip, found 6 days ago
$1,011
Roundtrip
found 6 days ago
Select Aer Lingus flight, departing Thu, Dec 11 from St. Louis to Southampton, returning Thu, Dec 18, priced at $1,011 found 6 days ago
Aer Lingus
Wed, May 27 - Sun, Jun 7
STL
St. Louis
SOU
Southampton
$1,421 Roundtrip, found 18 hours ago
$1,421
Roundtrip
found 18 hours ago
Select Aer Lingus flight, departing Wed, May 27 from St. Louis to Southampton, returning Sun, Jun 7, priced at $1,421 found 18 hours ago
Delta
Wed, May 27 - Sun, Jun 7
STL
St. Louis
SOU
Southampton
$1,487 Roundtrip, found 18 hours ago
$1,487
Roundtrip
found 18 hours ago
Select Delta flight, departing Wed, May 27 from St. Louis to Southampton, returning Sun, Jun 7, priced at $1,487 found 18 hours ago
Delta
Wed, May 27 - Sun, Jun 7
STL
St. Louis
SOU
Southampton
$1,494 Roundtrip, found 18 hours ago
$1,494
Roundtrip
found 18 hours ago
Select Delta flight, departing Wed, May 27 from St. Louis to Southampton, returning Sun, Jun 7, priced at $1,494 found 18 hours ago
Delta
Wed, May 27 - Sun, Jun 7
STL
St. Louis
SOU
Southampton
$1,513 Roundtrip, found 18 hours ago
$1,513
Roundtrip
found 18 hours ago
Select Delta flight, departing Wed, May 27 from St. Louis to Southampton, returning Sun, Jun 7, priced at $1,513 found 18 hours ago
Delta
Wed, May 27 - Sun, Jun 7
STL
St. Louis
SOU
Southampton
$1,520 Roundtrip, found 18 hours ago
$1,520
Roundtrip
found 18 hours ago
Select Delta flight, departing Wed, May 27 from St. Louis to Southampton, returning Sun, Jun 7, priced at $1,520 found 18 hours ago
Aer Lingus
Wed, May 27 - Sun, Jun 7
STL
St. Louis
SOU
Southampton
$1,526 Roundtrip, found 18 hours ago
$1,526
Roundtrip
found 18 hours ago
Select Aer Lingus flight, departing Wed, May 27 from St. Louis to Southampton, returning Sun, Jun 7, priced at $1,526 found 18 hours ago
KLM
Wed, May 27 - Sun, Jun 7
STL
St. Louis
SOU
Southampton
$1,539 Roundtrip, found 18 hours ago
$1,539
Roundtrip
found 18 hours ago
Select KLM flight, departing Wed, May 27 from St. Louis to Southampton, returning Sun, Jun 7, priced at $1,539 found 18 hours ago
Delta
Wed, May 27 - Sun, Jun 7
STL
St. Louis
SOU
Southampton
$1,546 Roundtrip, found 18 hours ago
$1,546
Roundtrip
found 18 hours ago
Select Delta flight, departing Wed, May 27 from St. Louis to Southampton, returning Sun, Jun 7, priced at $1,546 found 18 hours ago
Delta
Wed, May 27 - Sun, Jun 7
STL
St. Louis
SOU
Southampton
$1,557 Roundtrip, found 18 hours ago
$1,557
Roundtrip
found 18 hours ago
Select Delta flight, departing Wed, May 27 from St. Louis to Southampton, returning Sun, Jun 7, priced at $1,557 found 18 hours ago

Frequently asked questions

How much does a flight from Lambert-St. Louis Intl. Airport (STL) to Southampton Airport (SOU) cost?
Snag a cheap one-way flight from $589 or cheap return flight from $1,011 from Lambert-St. Louis Intl. Airport (STL) to Southampton Airport (SOU) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight deals on this route.
What is the cheapest month to fly from Lambert-St. Louis Intl. Airport (STL) to Southampton Airport (SOU)?
Planning your getaway for December is a great way to save, as it's the cheapest month for flights between STL and SOU. You'll usually find the lowest prices during the off-season.
What is the cheapest airline that flies from Lambert-St. Louis Intl. Airport (STL) to Southampton Airport (SOU)?
Expedia's filter tool lets you easily compare different airlines, departure times and fares all in one place. Select your preferences, then sort by "Price (lowest to highest)" to find out which carrier offers the cheapest STL to SOU flight.
How many flights per day from Lambert-St. Louis Intl. Airport (STL) to Southampton Airport (SOU)?
You'll have to hop on a flight with a layover if you're traveling from Lambert-St. Louis Intl. Airport (STL) to Southampton Airport (SOU). Direct flights don't operate daily on this route. However, simply filter your search to include one or two stops to find an option that works for you.
What day of the week has the most flights from STL to SOU?
Usually you'll have the most choice when it comes to flights on a Friday. Tuesdays tend to be the quietest.* But this can vary based on the time of year, carrier and other factors.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Lambert-St. Louis Intl. Airport (STL) to Southampton Airport (SOU)?
Opt for a flight from Lambert-St. Louis Intl. Airport (STL) to Southampton Airport (SOU) that takes off before 3 PM to reduce the likelihood of delays and cancellations. Later departures have a 22% higher chance of being canceled, on average.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Lambert-St. Louis Intl. Airport (STL) to Southampton Airport (SOU) last-minute?
Last-minute bookings from STL to SOU are typically more expensive. To lock in the best rates, start searching for flights well in advance. That being said, if you're flexible with your travel dates, you may find a cheap fare right before you leave.
Is it cheaper to book a STL to SOU flight and hotel package?
Compared with arranging hotels and flights separately, booking a STL to SOU flight and hotel package with Expedia could lead to significant savings. Better yet, having everything in one convenient place takes the hassle out of planning your trip. Simply secure your flights and select from our wide range of hotels, then tailor your trip with other add-ons like tours, activities and car rentals.
Can I cancel or change the date of my flight from Lambert-St. Louis Intl. Airport (STL) to Southampton Airport (SOU)?
In most instances, you're able to reschedule or cancel your STL to SOU flight. However, there may be additional charges, especially if you booked over 24 hours ago. Double-check your itinerary for the airline's fees and policies on flight changes, or if you'd like more details, go to our Customer Service portal.

Travel information

Origin airport
Lambert-St. Louis Intl.
Destination airport
Southampton
Airlines serving
Aer Lingus, Delta, KLM, Virgin Atlantic
Roundtrip price
$1,010
Distance
4170 mi

Book with confidence

St. Louis to Southampton Flights

The cheapest times to fly from St. Louis to Southampton

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from St. Louis to Southampton are during the month of December. You can find some of the cheapest flights from St. Louis to Southampton with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from St. Louis to Southampton

Sunday is one of the best days to book for cheap flights from St. Louis to Southampton: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from St. Louis to Southampton

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from St. Louis to Southampton in 2025. You can also book with separate airlines for your outbound and return journeys, from $589 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap St. Louis to Southampton flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your St. Louis to Southampton airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

St. Louis to Southampton Flights

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*Available to One Key members.