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Cheap flights from St. Louis to Osaka from $355

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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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.
Multiple Airlines Logo
4:05 pm - 10:20 pm
STL
-
KIX
39h 15m2 stops
Multiple Airlines Logo
3:45 pm - 3:29 pm
KIX
-
STL
38h 44m2 stops
$707Multiple Airlines
Tue, Feb 3 - Thu, Feb 19
United Airlines Logo
6:45 pm - 4:40 pm
STL
-
KIX
54h 55m2 stops
United Airlines Logo
6:35 pm - 12:25 pm
KIX
-
STL
32h 50m2 stops
$720United Airlines
Sun, Feb 15 - Sat, Feb 28
United Airlines Logo
6:45 am - 4:40 pm
STL
-
KIX
18h 55m1 stop
United Airlines Logo
8:20 am - 10:59 pm
KIX
-
STL
29h 39m2 stops
$744United Airlines
Sun, Feb 1 - Fri, Feb 20
Multiple Airlines Logo
4:05 pm - 10:20 pm
STL
-
KIX
39h 15m2 stops
Multiple Airlines Logo
3:00 pm - 3:29 pm
KIX
-
STL
39h 29m2 stops
$747Multiple Airlines
Thu, Jan 22 - Thu, Jan 29
United Airlines Logo
4:42 pm - 4:40 pm
STL
-
KIX
32h 58m2 stops
United Airlines Logo
8:20 am - 10:00 pm
KIX
-
STL
28h 40m2 stops
$749United Airlines
Sat, Jan 31 - Thu, Feb 19
United Airlines Logo
6:45 am - 7:25 pm
STL
-
KIX
21h 40m2 stops
United Airlines Logo
8:20 am - 8:23 pm
KIX
-
STL
27h 03m2 stops
$751United Airlines
Sun, Feb 1 - Thu, Feb 19
United Airlines Logo
5:00 pm - 4:40 pm
STL
-
KIX
32h 40m1 stop
United Airlines Logo
8:20 am - 10:59 pm
KIX
-
STL
29h 39m2 stops
$752United Airlines
Sat, Jan 31 - Fri, Feb 20
United Airlines Logo
6:45 am - 4:40 pm
STL
-
KIX
18h 55m1 stop
United Airlines Logo
8:20 am - 10:00 pm
KIX
-
STL
28h 40m2 stops
$765United Airlines
Fri, Feb 6 - Fri, Feb 20
Air Canada Logo
4:05 pm - 7:25 pm
STL
-
KIX
36h 20m2 stops
Air Canada Logo
3:45 pm - 3:29 pm
KIX
-
STL
38h 44m2 stops
$770Air Canada
Sun, Feb 1 - Thu, Feb 5
United Airlines Logo
5:00 pm - 4:40 pm
STL
-
KIX
32h 40m1 stop
United Airlines Logo
8:20 am - 9:00 pm
KIX
-
STL
27h 40m2 stops
$774United Airlines
Wed, Feb 4 - Wed, Feb 18

Air Canada flights from St. Louis to Osaka Kansai Intl Airport

Our best Air Canada deals on St. Louis to Osaka Kansai Intl Airport flight tickets
Air Canada
Feb 1
STL4:05 pmLambert-St Louis
36h 20m
2 stops
KIX7:25 pmOsaka Kansai Intl
Feb 5
KIX3:45 pmOsaka Kansai Intl
38h 44m
2 stops
STL3:29 pmLambert-St Louis
$770
Find similar
Air Canada
Feb 5
STL4:05 pmLambert-St Louis
36h 20m
2 stops
KIX7:25 pmOsaka Kansai Intl
Feb 19
KIX3:45 pmOsaka Kansai Intl
38h 44m
2 stops
STL3:29 pmLambert-St Louis
$820
Find similar
Air Canada
Mar 12
STL4:05 pmLambert-St Louis
37h 20m
2 stops
KIX7:25 pmOsaka Kansai Intl
Mar 25
KIX3:45 pmOsaka Kansai Intl
37h 44m
2 stops
STL3:29 pmLambert-St Louis
$1,089
Find similar

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 2
STL7:04 amLambert-St Louis
20h 46m
1 stop
KIX6:50 pmOsaka Kansai Intl
Feb 19
KIX5:50 pmOsaka Kansai Intl
20h 58m
1 stop
STL11:48 pmLambert-St Louis
$824
Find similar
Japan Airlines
Feb 3
STL3:20 pmLambert-St Louis
26h 05m
2 stops
KIX8:25 amOsaka Kansai Intl
Feb 19
KIX5:50 pmOsaka Kansai Intl
20h 58m
1 stop
STL11:48 pmLambert-St Louis
$828
Find similar
Japan Airlines
Feb 15
STL2:24 pmLambert-St Louis
27h 01m
2 stops
KIX8:25 amOsaka Kansai Intl
Feb 28
KIX5:50 pmOsaka Kansai Intl
20h 58m
1 stop
STL11:48 pmLambert-St Louis
$836
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 December 9, 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

Tue 2/3

4:05 pm-10:20 pm

2 stops39h 15m

Osaka Kansai Intl

Thu 2/19

3:45 pm-3:29 pm

2 stops38h 44m

$707

St. LouisOsaka

STL - KIX

STLKIX

Lambert-St Louis

Sun 2/15

6:45 pm-4:40 pm

2 stops54h 55m

Osaka Kansai Intl

Sat 2/28

6:35 pm-12:25 pm

2 stops32h 50m

$720

St. LouisOsaka

STL - KIX

STLKIX

Lambert-St Louis

Sun 2/1

6:45 am-4:40 pm

1 stop18h 55m

Osaka Kansai Intl

Fri 2/20

8:20 am-10:59 pm

2 stops29h 39m

$744

St. LouisOsaka

STL - KIX

STLKIX

Lambert-St Louis

Thu 1/22

4:05 pm-10:20 pm

2 stops39h 15m

Osaka Kansai Intl

Thu 1/29

3:00 pm-3:29 pm

2 stops39h 29m

$747

St. LouisOsaka

STL - KIX

STLKIX

Lambert-St Louis

Sat 1/31

4:42 pm-4:40 pm

2 stops32h 58m

Osaka Kansai Intl

Thu 2/19

8:20 am-10:00 pm

2 stops28h 40m

$749

St. LouisOsaka

STL - KIX

STLKIX

Lambert-St Louis

Sun 2/1

6:45 am-7:25 pm

2 stops21h 40m

Osaka Kansai Intl

Thu 2/19

8:20 am-8:23 pm

2 stops27h 03m

$751

St. LouisOsaka

STL - KIX

STLKIX

Lambert-St Louis

Sat 1/31

5:00 pm-4:40 pm

1 stop32h 40m

Osaka Kansai Intl

Fri 2/20

8:20 am-10:59 pm

2 stops29h 39m

$752

St. LouisOsaka

STL - KIX

STLKIX

Lambert-St Louis

Fri 2/6

6:45 am-4:40 pm

1 stop18h 55m

Osaka Kansai Intl

Fri 2/20

8:20 am-10:00 pm

2 stops28h 40m

$765

St. LouisOsaka

STL - KIX

STLKIX

Lambert-St Louis

Sun 2/1

4:05 pm-7:25 pm

2 stops36h 20m

Osaka Kansai Intl

Thu 2/5

3:45 pm-3:29 pm

2 stops38h 44m

$770

St. LouisOsaka

STL - KIX

STLKIX

Lambert-St Louis

Wed 2/4

5:00 pm-4:40 pm

1 stop32h 40m

Osaka Kansai Intl

Wed 2/18

8:20 am-9:00 pm

2 stops27h 40m

$774

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 typical price of a round-trip flight between St. Louis and Osaka Kansai Intl Airport?

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.

Can stopping save me money on St. Louis to Osaka Kansai Intl Airport flights?

You could potentially save up to 6% on your flight if you consider stops on a St. Louis to Osaka Kansai Intl Airport flight.

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

21h 50m

Direct flights

None
The fastest flight from St. Louis to Osaka Kansai Intl Airport takes 21h 50m
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 18h 55m.

  • 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
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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