$351 Cheap Flights from St. Louis (STL) to Osaka (KIX)

View $351 flight on Tue, Oct 28, 2025Opens 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 $351 for one-way flights and $657 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Air Canada
Sat, Oct 25 - Sat, Nov 1
STL
St. Louis
KIX
Osaka
$657 Roundtrip, found 3 hours ago
$657
Roundtrip
found 3 hours ago
Select Air Canada flight, departing Sat, Oct 25 from St. Louis to Osaka, returning Sat, Nov 1, priced at $657 found 3 hours ago
Air Canada
Sat, Oct 25 - Sat, Nov 1
STL
St. Louis
KIX
Osaka
$668 Roundtrip, found 3 hours ago
$668
Roundtrip
found 3 hours ago
Select Air Canada flight, departing Sat, Oct 25 from St. Louis to Osaka, returning Sat, Nov 1, priced at $668 found 3 hours ago
Air Canada
Mon, Nov 3 - Thu, Nov 6
STL
St. Louis
KIX
Osaka
$674 Roundtrip, found 3 days ago
$674
Roundtrip
found 3 days ago
Select Air Canada flight, departing Mon, Nov 3 from St. Louis to Osaka, returning Thu, Nov 6, priced at $674 found 3 days ago
Air Canada
Mon, Feb 23 - Tue, Mar 3
STL
St. Louis
KIX
Osaka
$683 Roundtrip, found 2 days ago
$683
Roundtrip
found 2 days ago
Select Air Canada flight, departing Mon, Feb 23 from St. Louis to Osaka, returning Tue, Mar 3, priced at $683 found 2 days ago
Air Canada
Mon, Feb 2 - Wed, Feb 11
STL
St. Louis
KIX
Osaka
$685 Roundtrip, found 1 day ago
$685
Roundtrip
found 1 day ago
Select Air Canada flight, departing Mon, Feb 2 from St. Louis to Osaka, returning Wed, Feb 11, priced at $685 found 1 day ago
United
Wed, Sep 24 - Tue, Oct 7
STL
St. Louis
KIX
Osaka
$703 Roundtrip, found 1 day ago
$703
Roundtrip
found 1 day ago
Select United flight, departing Wed, Sep 24 from St. Louis to Osaka, returning Tue, Oct 7, priced at $703 found 1 day ago
Delta
Mon, Sep 29 - Fri, Oct 17
STL
St. Louis
KIX
Osaka
$711 Roundtrip, found 1 day ago
$711
Roundtrip
found 1 day ago
Select Delta flight, departing Mon, Sep 29 from St. Louis to Osaka, returning Fri, Oct 17, priced at $711 found 1 day ago
All Nippon Airways
Tue, Sep 2 - Fri, Sep 19
STL
St. Louis
KIX
Osaka
$761 Roundtrip, found 1 day ago
$761
Roundtrip
found 1 day ago
Select All Nippon Airways flight, departing Tue, Sep 2 from St. Louis to Osaka, returning Fri, Sep 19, priced at $761 found 1 day ago
Japan Airlines
Tue, Oct 28 - Tue, Nov 11
STL
St. Louis
KIX
Osaka
$774 Roundtrip, found 1 day ago
$774
Roundtrip
found 1 day ago
Select Japan Airlines flight, departing Tue, Oct 28 from St. Louis to Osaka, returning Tue, Nov 11, priced at $774 found 1 day ago
American Airlines
Tue, Oct 28 - Tue, Nov 18
STL
St. Louis
KIX
Osaka
$926 Roundtrip, found 2 hours ago
$926
Roundtrip
found 2 hours ago
Select American Airlines flight, departing Tue, Oct 28 from St. Louis to Osaka, returning Tue, Nov 18, priced at $926 found 2 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. Closest option available. Average driving time to city center is 10 minutes. Flights from $856
ITM
Itami
Closest
Average driving time to city center10 min
Flights from $856
Select flight to Kobe Airport UKB. Average driving time to city center is 32 minutes. Flights from $950
UKB
Kobe Airport
Average driving time to city center32 min
Flights from $950
Flights from St. Louis (STL) to Osaka (KIX)
Origin airport
Lambert-St. Louis Intl.
Destination airport
Kansai Intl.
Airlines serving
Air Canada, All Nippon Airways, American Airlines, British Airways, Cathay Pacific, Delta, Japan Airlines, Korean Air, Lufthansa, Qatar Airways, Turkish Airlines, United
Roundtrip price
$656
Distance
6599 mi

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 October. 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 $351 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.

 

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 $351 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 October 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.

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*Available to One Key members.