$353 Cheap Flights from St. Louis (STL) to Osaka (KIX)

View $353 flight on Sun, Jan 25, 2026Opens in a new window

Popular airlines from St. Louis Lambert Intl. Airport (STL) to Kansai Intl. Airport (KIX)

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Cheap Flights from St. Louis to Osaka (STL-KIX)

Prices were available within the past 7 days and start at $353 for one-way flights and $657 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Sun, Jan 11 - Thu, Jan 22
STL
St. Louis
KIX
Osaka
$657 Roundtrip, found 19 hours ago
$657
Roundtrip
found 19 hours ago
Select United flight, departing Sun, Jan 11 from St. Louis to Osaka, returning Thu, Jan 22, priced at $657 found 19 hours ago
United
Mon, Jan 19 - Sat, Feb 7
STL
St. Louis
KIX
Osaka
$658 Roundtrip, found 19 hours ago
$658
Roundtrip
found 19 hours ago
Select United flight, departing Mon, Jan 19 from St. Louis to Osaka, returning Sat, Feb 7, priced at $658 found 19 hours ago
United
Fri, Jan 23 - Sat, Feb 7
STL
St. Louis
KIX
Osaka
$659 Roundtrip, found 19 hours ago
$659
Roundtrip
found 19 hours ago
Select United flight, departing Fri, Jan 23 from St. Louis to Osaka, returning Sat, Feb 7, priced at $659 found 19 hours ago
United
Fri, Jan 23 - Tue, Feb 3
STL
St. Louis
KIX
Osaka
$660 Roundtrip, found 7 hours ago
$660
Roundtrip
found 7 hours ago
Select United flight, departing Fri, Jan 23 from St. Louis to Osaka, returning Tue, Feb 3, priced at $660 found 7 hours ago
United
Fri, Jan 23 - Mon, Feb 2
STL
St. Louis
KIX
Osaka
$661 Roundtrip, found 7 hours ago
$661
Roundtrip
found 7 hours ago
Select United flight, departing Fri, Jan 23 from St. Louis to Osaka, returning Mon, Feb 2, priced at $661 found 7 hours ago
United
Sat, Jan 10 - Thu, Jan 22
STL
St. Louis
KIX
Osaka
$664 Roundtrip, found 19 hours ago
$664
Roundtrip
found 19 hours ago
Select United flight, departing Sat, Jan 10 from St. Louis to Osaka, returning Thu, Jan 22, priced at $664 found 19 hours ago
All Nippon Airways
Thu, Jan 22 - Sun, Feb 1
STL
St. Louis
KIX
Osaka
$681 Roundtrip, found 7 hours ago
$681
Roundtrip
found 7 hours ago
Select All Nippon Airways flight, departing Thu, Jan 22 from St. Louis to Osaka, returning Sun, Feb 1, priced at $681 found 7 hours ago
Air Canada
Sun, Feb 1 - Tue, Feb 10
STL
St. Louis
KIX
Osaka
$793 Roundtrip, found 1 day ago
$793
Roundtrip
found 1 day ago
Select Air Canada flight, departing Sun, Feb 1 from St. Louis to Osaka, returning Tue, Feb 10, priced at $793 found 1 day ago
Delta
Tue, Mar 10 - Tue, Mar 24
STL
St. Louis
KIX
Osaka
$860 Roundtrip, found 3 days ago
$860
Roundtrip
found 3 days ago
Select Delta flight, departing Tue, Mar 10 from St. Louis to Osaka, returning Tue, Mar 24, priced at $860 found 3 days ago
Japan Airlines
Wed, Feb 11 - Wed, Feb 18
STL
St. Louis
KIX
Osaka
$865 Roundtrip, found 13 hours ago
$865
Roundtrip
found 13 hours ago
Select Japan Airlines flight, departing Wed, Feb 11 from St. Louis to Osaka, returning Wed, Feb 18, priced at $865 found 13 hours ago

Alternative airports near Osaka

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

Select flight to Itami ITM. Cheapest and Closest option available. Average driving time to city center is 10 minutes. Flights from $1,037
ITM
Itami
CheapestClosest
Average driving time to city center10 min
Flights from $1,037
Select flight to Kobe Airport UKB. Average driving time to city center is 32 minutes. Flights from $1,129
UKB
Kobe Airport
Average driving time to city center32 min
Flights from $1,129

Frequently asked questions

How much does a flight from Lambert-St. Louis Intl. Airport (STL) to Kansai Intl. Airport (KIX) cost?
Lock in a cheap one-way flight from $353 or cheap return flight from $657 from Lambert-St. Louis Intl. Airport (STL) to Kansai Intl. Airport (KIX) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight offers on this route.
What is the cheapest month to fly from Lambert-St. Louis Intl. Airport (STL) to Kansai Intl. Airport (KIX)?
Planning your getaway for January is a good way to save, as it's the cheapest month for flights between STL and KIX. You'll usually find the lowest prices during off-peak months.
How many flights per day from Lambert-St. Louis Intl. Airport (STL) to Kansai Intl. Airport (KIX)?
Nonstop flights from Lambert-St. Louis Intl. Airport (STL) to Kansai Intl. Airport (KIX) aren't available daily, so you'll need to take a flight with a layover. Explore your options with our filter tool. Enter your travel details and select either "1 Stop" or "2+ Stops."
What day of the week has the most flights from STL to KIX?
Friday is usually the busiest day for flights, while Tuesday tends to be the quietest.* Keep in mind that flight schedules can change based on a number of factors, including the carrier and season.*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 Kansai Intl. Airport (KIX)?
To land at Kansai Intl. Airport (KIX) on schedule, pick a flight that leaves from Lambert-St. Louis Intl. Airport (STL) before 3 PM. The likelihood of cancellations is 22% higher, on average, for departures after this time.**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 Kansai Intl. Airport (KIX) last-minute?
Last-minute bookings from STL to KIX are usually more expensive. To secure the best prices, start searching for flights early. That said, if you're flexible with your travel plans, you may land a cheap fare just before your departure.
Is it cheaper to book a STL to KIX flight and hotel package?
You can save money by booking a STL to KIX flight and hotel package compared to booking separately. In fact, you could save hundreds of dollars by bundling with Expedia. And it's simple to manage everything in one convenient place. Once you've selected your ideal flights and accommodations, you can add extras such as tours, activities and car rentals.
Can I cancel or change the date of my flight from Lambert-St. Louis Intl. Airport (STL) to Kansai Intl. Airport (KIX)?
In most instances, you can modify or cancel your STL to KIX flight. However, additional fees may apply, especially if you booked over 24 hours ago. Check your itinerary for the airline's fees and rules 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
Kansai Intl.
Airlines serving
Air Canada, All Nippon Airways, American Airlines, Asiana Airlines, British Airways, Cathay Pacific, Delta, Japan Airlines, Korean Air, Lufthansa, Qatar Airways, Turkish Airlines, United
Roundtrip price
$656
Distance
6599 mi

Book with confidence

St. Louis to Osaka Flights

The cheapest times to fly from St. Louis to Osaka

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 Osaka are during the month of January. You can find some of the cheapest flights from St. Louis to Osaka with Expedia's search tool and vast selection of airlines.

 

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

Sunday is one of the best days to book for cheap flights from St. Louis to Osaka: 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 Osaka

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 Osaka in 2025. You can also book with separate airlines for your outbound and return journeys, from $353 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 Osaka 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 Osaka 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 Osaka Flights

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*Available to One Key members.