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Cheap flights from St. Louis to Osaka from $381

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Osaka departing on 2/15. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Cheap round-trip flights

Enter your travel dates to find the best prices.
United Airlines Logo
6:00 pm - 4:40 pmSTL-KIX
31h 40m2 stops
United Airlines Logo
6:35 pm - 10:56 pmKIX-STL
19h 21m2 stops
$706United Airlines
Find Deal
Sat, Feb 14 - Tue, Mar 3
United Airlines Logo
7:41 am - 7:25 pmSTL-KIX
20h 44m2 stops
United Airlines Logo
8:20 am - 9:00 pmKIX-STL
27h 40m2 stops
$711United Airlines
Find Deal
Sun, Feb 15 - Thu, Feb 26
Multiple Airlines Logo
7:41 am - 7:25 pmSTL-KIX
20h 44m2 stops
Multiple Airlines Logo
2:05 pm - 7:25 pmKIX-STL
20h 20m2 stops
$712Multiple Airlines
Find Deal
Sun, Feb 15 - Sat, Feb 28
United Airlines Logo
5:25 pm - 4:40 pmSTL-KIX
32h 15m1 stop
United Airlines Logo
8:20 am - 10:00 pmKIX-STL
28h 40m2 stops
$713United Airlines
Find Deal
Wed, Feb 18 - Tue, Mar 3
United Airlines Logo
5:25 pm - 4:40 pmSTL-KIX
32h 15m1 stop
United Airlines Logo
8:20 am - 8:23 pmKIX-STL
27h 03m2 stops
$714United Airlines
Find Deal
Wed, Feb 18 - Mon, Mar 2
ANA Logo
6:30 am - 10:20 pmSTL-KIX
24h 50m2 stops
ANA Logo
8:20 am - 3:52 pmKIX-STL
22h 32m2 stops
$780ANA
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Wed, Dec 31 - Fri, Jan 23
Japan Airlines Logo
6:10 am - 6:50 pmSTL-KIX
21h 40m1 stop
Japan Airlines Logo
7:00 am - 11:10 amKIX-STL
19h 10m2 stops
$822Japan Airlines
Find Deal
Sun, Feb 15 - Fri, Feb 27
Japan Airlines Logo
6:10 am - 6:50 pmSTL-KIX
21h 40m1 stop
Japan Airlines Logo
5:50 pm - 11:08 pmKIX-STL
20h 18m1 stop
$823Japan Airlines
Find Deal
Sun, Feb 15 - Sat, Feb 28
Alaska Airlines Logo
7:00 am - 10:20 pmSTL-KIX
24h 20m2 stops
Alaska Airlines Logo
9:00 pm - 11:56 pmKIX-STL
41h 56m2 stops
$842Alaska Airlines
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Tue, Feb 17 - Mon, Mar 2
ANA Logo
8:05 am - 10:20 pmSTL-KIX
23h 15m2 stops
ANA Logo
9:10 pm - 3:52 pmKIX-STL
33h 42m2 stops
$910ANA
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Wed, Dec 31 - Tue, Jan 13

Japan Airlines flights from St. Louis to Osaka Kansai Intl Airport

Our best Japan Airlines deals on St. Louis to Osaka Kansai Intl Airport flight tickets
Japan Airlines
Feb 15
STL6:10 amLambert-St Louis
21h 40m
1 stop
KIX6:50 pmOsaka Kansai Intl
Feb 27
KIX7:00 amOsaka Kansai Intl
19h 10m
2 stops
STL11:10 amLambert-St Louis
$822
Find similar
Japan Airlines
Feb 15
STL6:10 amLambert-St Louis
21h 40m
1 stop
KIX6:50 pmOsaka Kansai Intl
Feb 28
KIX5:50 pmOsaka Kansai Intl
20h 18m
1 stop
STL11:08 pmLambert-St Louis
$823
Find similar
Japan Airlines
Feb 15
STL12:58 pmLambert-St Louis
28h 27m
2 stops
KIX8:25 amOsaka Kansai Intl
Feb 28
KIX7:00 amOsaka Kansai Intl
19h 10m
2 stops
STL11:10 amLambert-St Louis
$831
Find similar

United Airlines flights from St. Louis to Osaka Kansai Intl Airport

Our best United Airlines deals on St. Louis to Osaka Kansai Intl Airport flight tickets
United Airlines
Feb 14
STL6:00 pmLambert-St Louis
31h 40m
2 stops
KIX4:40 pmOsaka Kansai Intl
Mar 3
KIX6:35 pmOsaka Kansai Intl
19h 21m
2 stops
STL10:56 pmLambert-St Louis
$706
Find similar
United Airlines
Feb 15
STL7:41 amLambert-St Louis
20h 44m
2 stops
KIX7:25 pmOsaka Kansai Intl
Feb 26
KIX8:20 amOsaka Kansai Intl
27h 40m
2 stops
STL9:00 pmLambert-St Louis
$711
Find similar
United Airlines
Feb 18
STL5:25 pmLambert-St Louis
32h 15m
1 stop
KIX4:40 pmOsaka Kansai Intl
Mar 3
KIX8:20 amOsaka Kansai Intl
28h 40m
2 stops
STL10:00 pmLambert-St Louis
$713
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from St. Louis to Osaka Kansai Intl Airport that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated October 16, 2025.
Use the filters below to find and compare flights from St. Louis to Osaka Kansai Intl Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisOsaka

STL - KIX

STLKIX

Lambert-St Louis

Sat 2/14

6:00 pm-4:40 pm

2 stops31h 40m

Osaka Kansai Intl

Tue 3/3

6:35 pm-10:56 pm

2 stops19h 21m

$706

St. LouisOsaka

STL - KIX

STLKIX

Lambert-St Louis

Sun 2/15

7:41 am-7:25 pm

2 stops20h 44m

Osaka Kansai Intl

Thu 2/26

8:20 am-9:00 pm

2 stops27h 40m

$711

St. LouisOsaka

STL - KIX

STLKIX

Lambert-St Louis

Sun 2/15

7:41 am-7:25 pm

2 stops20h 44m

Osaka Kansai Intl

Sat 2/28

2:05 pm-7:25 pm

2 stops20h 20m

$712

St. LouisOsaka

STL - KIX

STLKIX

Lambert-St Louis

Wed 2/18

5:25 pm-4:40 pm

1 stop32h 15m

Osaka Kansai Intl

Tue 3/3

8:20 am-10:00 pm

2 stops28h 40m

$713

St. LouisOsaka

STL - KIX

STLKIX

Lambert-St Louis

Wed 2/18

5:25 pm-4:40 pm

1 stop32h 15m

Osaka Kansai Intl

Mon 3/2

8:20 am-8:23 pm

2 stops27h 03m

$714

St. LouisOsaka

STL - KIX

STLKIX

Lambert-St Louis

Wed 12/31

6:30 am-10:20 pm

2 stops24h 50m

Osaka Kansai Intl

Fri 1/23

8:20 am-3:52 pm

2 stops22h 32m

$780

St. LouisOsaka

STL - KIX

STLKIX

Lambert-St Louis

Sun 2/15

6:10 am-6:50 pm

1 stop21h 40m

Osaka Kansai Intl

Fri 2/27

7:00 am-11:10 am

2 stops19h 10m

$822

St. LouisOsaka

STL - KIX

STLKIX

Lambert-St Louis

Sun 2/15

6:10 am-6:50 pm

1 stop21h 40m

Osaka Kansai Intl

Sat 2/28

5:50 pm-11:08 pm

1 stop20h 18m

$823

St. LouisOsaka

STL - KIX

STLKIX

Lambert-St Louis

Tue 2/17

7:00 am-10:20 pm

2 stops24h 20m

Osaka Kansai Intl

Mon 3/2

9:00 pm-11:56 pm

2 stops41h 56m

$842

St. LouisOsaka

STL - KIX

STLKIX

Lambert-St Louis

Wed 12/31

8:05 am-10:20 pm

2 stops23h 15m

Osaka Kansai Intl

Tue 1/13

9:10 pm-3:52 pm

2 stops33h 42m

$910

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Osaka from

How to get the cheapest flight ticket from St. Louis to Osaka Kansai Intl Airport

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest day to depart on your flight to Osaka Kansai Intl Airport?

The cheapest day to depart from St. Louis to Osaka Kansai Intl Airport is on a Sunday. Travelers who choose to depart for Osaka Kansai Intl Airport on a Sunday will often find tickets for as low as $1,214. Flights from St. Louis to Osaka Kansai Intl Airport on a Monday will generally be more expensive and average around $1,861. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

What is the cheapest time of day to depart on your flight to Osaka Kansai Intl Airport?

Our data shows that the cheapest St. Louis to Osaka Kansai Intl Airport flights are usually those with departure times in the evening. Our users have found flights to Osaka Kansai Intl Airport in the evening for as low as $1,214. If you have a flexible travel schedule, then try to avoid flying in the afternoon when prices are $1,861 on average. Flights to Osaka Kansai Intl Airport from St. Louis in the afternoon are generally more expensive because this time of day is more convenient for travelers’ schedules.

When to book flights from St. Louis to Osaka Kansai Intl Airport

Are you open to changing your travel dates? Check out the ideal times to fly from St. Louis to Osaka Kansai Intl Airport according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap St. Louis to Osaka Kansai Intl Airport (STL to KIX) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to Osaka Kansai Intl Airport

Direct flights

None
There are no direct flights from St. Louis to Osaka Kansai Intl Airport. There are no popular flight routes from St. Louis to Osaka Kansai Intl Airport.
Search flight deals

  • How far is Lambert-St Louis to Osaka Kansai Intl by plane?

    The straight-line distance from Lambert-St Louis to Osaka Kansai Intl is 6607.3 mi. A reasonable flight in good conditions will take 20h 44m.

  • When did momondo last update prices for flights from Lambert-St Louis Airport to Osaka Kansai Intl Airport?

    Prices for flights from Lambert-St Louis Airport to Osaka Kansai Intl Airport were last updated today.

  • How many operators does momondo search for flights from Lambert-St Louis Airport to Osaka Kansai Intl Airport?

  • How old do you have to be to fly from Lambert-St Louis Airport to Osaka Kansai Intl Airport?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Lambert-St Louis Airport to Osaka Kansai Intl Airport.

  • What documentation or ID do you need to fly to Osaka Kansai Intl Airport?

    The necessary travel and health documents for your Osaka Kansai Intl Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

  • What is the most popular airline from St. Louis to Osaka Kansai Intl Airport?

Best airlines flying from St. Louis to Osaka Kansai Intl Airport

Compare and see reviews for airlines that fly from St. Louis to Osaka Kansai Intl Airport with momondo
Airline
Rating
Free Cancellation
Price
Japan AirlinesPriceFrom $723Free CancellationRating
8.3
1,579 reviews
Search Japan Airlines flights

Traveling to a place near Osaka?

Book flights to Osaka if you plan to visit one of these locations
Nara
Himeji
Izumisano
Nishinomiya

Why use momondo?

Why should I use momondo to find a flight deal from St. Louis to Osaka?

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from St. Louis to Osaka. Millions of users trust and use momondo every year so you are in good hands.

Can I find flights from St. Louis to Osaka with flexible booking policies on momondo?

Yes. momondo allows you to filter the results for St. Louis to Osaka flights to just show those with flexible booking policies.

How can momondo help me find flights from St. Louis to Osaka?

momondo provides multiple filters to help you find the best flight to Osaka from St. Louis. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

I’m not ready to book a flight from St. Louis to Osaka right now. Can momondo alert me if prices change?

Price alerts on flights to Osaka from St. Louis are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

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