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Cheap flights from St. Louis to Osaka from $686

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 6/14. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

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Find the cheapest flights from St. Louis to Osaka

Cheap round-trip flights

Enter your travel dates to find the best prices.
Air Canada Logo
12:10 pm - 4:25 pm
STL
-
KIX
38h 15m
2 stops
Air Canada Logo
6:00 pm - 6:41 pm
KIX
-
STL
38h 41m
2 stops
$879Air Canada
Tue, Sep 15 - Tue, Sep 22
Air Canada Logo
8:55 am - 4:25 pm
STL
-
KIX
17h 30m
1 stop
Air Canada Logo
6:00 pm - 6:41 pm
KIX
-
STL
38h 41m
2 stops
$883Air Canada
Tue, Sep 15 - Tue, Sep 22
Air Canada Logo
12:10 pm - 4:25 pm
STL
-
KIX
38h 15m
2 stops
Air Canada Logo
6:00 pm - 6:41 pm
KIX
-
STL
38h 41m
2 stops
$938Air Canada
Tue, Sep 15 - Tue, Sep 22
Air Canada Logo
8:55 am - 4:25 pm
STL
-
KIX
17h 30m
1 stop
Air Canada Logo
6:00 pm - 6:41 pm
KIX
-
STL
38h 41m
2 stops
$942Air Canada
Tue, Sep 15 - Tue, Sep 22
Air Canada Logo
12:10 pm - 4:25 pm
STL
-
KIX
38h 15m
2 stops
Air Canada Logo
6:00 pm - 6:41 pm
KIX
-
STL
38h 41m
2 stops
$947Air Canada
Tue, Sep 15 - Tue, Sep 22
Air Canada Logo
8:55 am - 4:25 pm
STL
-
KIX
17h 30m
1 stop
Air Canada Logo
6:00 pm - 6:41 pm
KIX
-
STL
38h 41m
2 stops
$952Air Canada
Tue, Sep 15 - Tue, Sep 22
Air Canada Logo
2:40 pm - 4:25 pm
STL
-
KIX
35h 45m
2 stops
Air Canada Logo
6:00 pm - 2:00 pm
KIX
-
STL
34h 00m
1 stop
$1,104Air Canada
Sat, Sep 19 - Wed, Sep 23
Air Canada Logo
2:40 pm - 4:25 pm
STL
-
KIX
35h 45m
2 stops
Air Canada Logo
6:00 pm - 6:41 pm
KIX
-
STL
38h 41m
2 stops
$1,108Air Canada
Sat, Sep 19 - Wed, Sep 23
Air Canada Logo
2:40 pm - 4:25 pm
STL
-
KIX
35h 45m
2 stops
Air Canada Logo
6:00 pm - 2:00 pm
KIX
-
STL
34h 00m
1 stop
$1,139Air Canada
Sat, Sep 19 - Wed, Sep 23
Air Canada Logo
2:40 pm - 4:25 pm
STL
-
KIX
35h 45m
2 stops
Air Canada Logo
6:00 pm - 6:41 pm
KIX
-
STL
38h 41m
2 stops
$1,142Air Canada
Sat, Sep 19 - Wed, Sep 23

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
Aug 5
STL5:10 amLambert-St Louis
19h 40m
2 stops
KIX2:50 pmOsaka Kansai Intl
Aug 13
KIX4:55 pmOsaka Kansai Intl
33h 45m
2 stops
STL12:40 pmLambert-St Louis
$1,198
United Airlines
Aug 6
STL5:10 amLambert-St Louis
19h 40m
2 stops
KIX2:50 pmOsaka Kansai Intl
Aug 14
KIX4:55 pmOsaka Kansai Intl
31h 14m
2 stops
STL10:09 amLambert-St Louis
$1,248

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

Our best American Airlines deals on St. Louis to Osaka Kansai Intl Airport flight tickets
American Airlines
Aug 5
STL6:30 amLambert-St Louis
22h 15m
1 stop
KIX6:45 pmOsaka Kansai Intl
Aug 13
KIX5:45 pmOsaka Kansai Intl
19h 23m
1 stop
STL11:08 pmLambert-St Louis
$1,393
American Airlines
Aug 5
STL6:30 amLambert-St Louis
22h 15m
1 stop
KIX6:45 pmOsaka Kansai Intl
Aug 14
KIX5:45 pmOsaka Kansai Intl
19h 23m
1 stop
STL11:08 pmLambert-St Louis
$1,493
American Airlines
Apr 9
STL6:21 amLambert-St Louis
22h 24m
1 stop
KIX6:45 pmOsaka Kansai Intl
Apr 15
KIX5:45 pmOsaka Kansai Intl
20h 12m
1 stop
STL11:57 pmLambert-St Louis
$2,416

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 March 29, 2026.
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

Cheapest round-trip

St. LouisOsaka

STL - KIX

STLKIX

Lambert-St Louis

Tue 9/15

12:10 pm-4:25 pm

2 stops38h 15m

Osaka Kansai Intl

Tue 9/22

6:00 pm-6:41 pm

2 stops38h 41m

$879
Quickest round-trip

St. LouisOsaka

STL - KIX

STLKIX

Lambert-St Louis

Tue 9/15

8:55 am-4:25 pm

1 stop17h 30m

Osaka Kansai Intl

Tue 9/22

6:00 pm-6:41 pm

2 stops38h 41m

$883

St. LouisOsaka

STL - KIX

STLKIX

Lambert-St Louis

Tue 9/15

12:10 pm-4:25 pm

2 stops38h 15m

Osaka Kansai Intl

Tue 9/22

6:00 pm-6:41 pm

2 stops38h 41m

$938

St. LouisOsaka

STL - KIX

STLKIX

Lambert-St Louis

Tue 9/15

8:55 am-4:25 pm

1 stop17h 30m

Osaka Kansai Intl

Tue 9/22

6:00 pm-6:41 pm

2 stops38h 41m

$942

St. LouisOsaka

STL - KIX

STLKIX

Lambert-St Louis

Tue 9/15

12:10 pm-4:25 pm

2 stops38h 15m

Osaka Kansai Intl

Tue 9/22

6:00 pm-6:41 pm

2 stops38h 41m

$947

St. LouisOsaka

STL - KIX

STLKIX

Lambert-St Louis

Tue 9/15

8:55 am-4:25 pm

1 stop17h 30m

Osaka Kansai Intl

Tue 9/22

6:00 pm-6:41 pm

2 stops38h 41m

$952

St. LouisOsaka

STL - KIX

STLKIX

Lambert-St Louis

Sat 9/19

2:40 pm-4:25 pm

2 stops35h 45m

Osaka Kansai Intl

Wed 9/23

6:00 pm-2:00 pm

1 stop34h 00m

$1,104

St. LouisOsaka

STL - KIX

STLKIX

Lambert-St Louis

Sat 9/19

2:40 pm-4:25 pm

2 stops35h 45m

Osaka Kansai Intl

Wed 9/23

6:00 pm-6:41 pm

2 stops38h 41m

$1,108

St. LouisOsaka

STL - KIX

STLKIX

Lambert-St Louis

Sat 9/19

2:40 pm-4:25 pm

2 stops35h 45m

Osaka Kansai Intl

Wed 9/23

6:00 pm-2:00 pm

1 stop34h 00m

$1,139

St. LouisOsaka

STL - KIX

STLKIX

Lambert-St Louis

Sat 9/19

2:40 pm-4:25 pm

2 stops35h 45m

Osaka Kansai Intl

Wed 9/23

6:00 pm-6:41 pm

2 stops38h 41m

$1,142

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 airline that flies from Lambert-St Louis to Osaka Kansai Intl?

Air Canada is the most popular carrier operating from Lambert-St Louis to Osaka Kansai Intl

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

Fastest flight time

19h 40m

Direct flights

None
The fastest flight from St. Louis to Osaka Kansai Intl Airport takes 19h 40m
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 19h 40m.

  • 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 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.

Traveling to a place near Osaka?

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