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Cheap flights from St. Louis to Osaka from $437

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.
Air Canada Logo
4:05 pm - 4:25 pm
STL
-
KIX
34h 20m
2 stops
Air Canada Logo
6:00 pm - 8:05 pm
KIX
-
STL
40h 05m
2 stops
$806Air Canada
Sun, Apr 26 - Sat, May 2
United Airlines Logo
6:00 pm - 4:40 pm
STL
-
KIX
55h 40m
2 stops
United Airlines Logo
6:35 pm - 10:36 am
KIX
-
STL
31h 01m
2 stops
$890United Airlines
Sun, Feb 15 - Sat, Feb 28
United Airlines Logo
6:55 pm - 4:40 pm
STL
-
KIX
54h 45m
2 stops
United Airlines Logo
6:35 pm - 10:36 am
KIX
-
STL
31h 01m
2 stops
$891United Airlines
Sun, Feb 15 - Sat, Feb 28
Japan Airlines Logo
8:00 am - 7:55 pm
STL
-
ITM
20h 55m
2 stops
Japan Airlines Logo
7:25 am - 1:50 pm
ITM
-
STL
21h 25m
2 stops
$909Japan Airlines
Sun, Feb 15 - Sat, Feb 28
Japan Airlines Logo
2:19 pm - 8:25 am
STL
-
KIX
27h 06m
2 stops
Japan Airlines Logo
7:00 am - 1:50 pm
KIX
-
STL
21h 50m
2 stops
$911Japan Airlines
Sun, Feb 15 - Sat, Feb 28
ANA Logo
7:41 am - 1:10 pm
STL
-
ITM
38h 29m
2 stops
ANA Logo
2:05 pm - 12:21 pm
ITM
-
STL
37h 16m
2 stops
$920ANA
Sun, Feb 15 - Sat, Feb 28
Japan Airlines Logo
6:38 am - 7:55 pm
STL
-
ITM
22h 17m
2 stops
Japan Airlines Logo
4:30 pm - 1:43 pm
ITM
-
STL
36h 13m
2 stops
$943Japan Airlines
Thu, Feb 19 - Mon, Feb 23
ANA Logo
4:05 pm - 6:55 pm
STL
-
ITM
36h 50m
2 stops
ANA Logo
3:00 pm - 8:04 pm
ITM
-
STL
19h 04m
2 stops
$954ANA
Sun, Apr 26 - Sat, May 2
Cathay Pacific Logo
12:19 pm - 2:50 pm
STL
-
KIX
36h 31m
3 stops
Cathay Pacific Logo
5:35 pm - 10:59 pm
KIX
-
STL
43h 24m
2 stops
$1,347Cathay Pacific
Sun, Apr 26 - Sat, May 2
American Airlines Logo
6:00 am - 7:50 pm
STL
-
ITM
23h 50m
2 stops
American Airlines Logo
1:30 pm - 7:30 pm
ITM
-
STL
20h 00m
2 stops
$1,917American Airlines
Mon, Mar 30 - Fri, Apr 10

United Airlines flights from St. Louis to Osaka

Our best United Airlines deals on St. Louis to Osaka flight tickets
United Airlines
Feb 15
STL6:00 pmLambert-St Louis
55h 40m
2 stops
KIX4:40 pmOsaka Kansai Intl
Feb 28
KIX6:35 pmOsaka Kansai Intl
31h 01m
2 stops
STL10:36 amLambert-St Louis
$890
United Airlines
Feb 15
STL6:55 pmLambert-St Louis
54h 45m
2 stops
KIX4:40 pmOsaka Kansai Intl
Feb 28
KIX6:35 pmOsaka Kansai Intl
31h 01m
2 stops
STL10:36 amLambert-St Louis
$891
United Airlines
Feb 13
STL6:00 amLambert-St Louis
43h 40m
2 stops
KIX4:40 pmOsaka Kansai Intl
Feb 16
KIX6:35 pmOsaka Kansai Intl
19h 24m
2 stops
STL10:59 pmLambert-St Louis
$1,170

Japan Airlines flights from St. Louis to Osaka

Our best Japan Airlines deals on St. Louis to Osaka flight tickets
Japan Airlines
Feb 15
STL8:00 amLambert-St Louis
20h 55m
2 stops
ITM7:55 pmOsaka Itami
Feb 28
ITM7:25 amOsaka Itami
21h 25m
2 stops
STL1:50 pmLambert-St Louis
$909
Japan Airlines
Feb 15
STL2:19 pmLambert-St Louis
27h 06m
2 stops
KIX8:25 amOsaka Kansai Intl
Feb 28
KIX7:00 amOsaka Kansai Intl
21h 50m
2 stops
STL1:50 pmLambert-St Louis
$911
Japan Airlines
Feb 19
STL6:38 amLambert-St Louis
22h 17m
2 stops
ITM7:55 pmOsaka Itami
Feb 23
ITM4:30 pmOsaka Itami
36h 13m
2 stops
STL1:43 pmLambert-St Louis
$943

momondo Fare Finder

 
Customize your flight search to find flights from St. Louis to Osaka 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 February 6, 2026.
Use the filters below to find and compare flights from St. Louis to Osaka that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisOsaka

STL - KIX

STLKIX

Lambert-St Louis

Sun 4/26

4:05 pm-4:25 pm

2 stops34h 20m

Osaka Kansai Intl

Sat 5/2

6:00 pm-8:05 pm

2 stops40h 05m

$806

St. LouisOsaka

STL - KIX

STLKIX

Lambert-St Louis

Sun 2/15

6:00 pm-4:40 pm

2 stops55h 40m

Osaka Kansai Intl

Sat 2/28

6:35 pm-10:36 am

2 stops31h 01m

$890

St. LouisOsaka

STL - KIX

STLKIX

Lambert-St Louis

Sun 2/15

6:55 pm-4:40 pm

2 stops54h 45m

Osaka Kansai Intl

Sat 2/28

6:35 pm-10:36 am

2 stops31h 01m

$891

St. LouisOsaka

STL - ITM

STLITM

Lambert-St Louis

Sun 2/15

8:00 am-7:55 pm

2 stops20h 55m

Osaka Itami

Sat 2/28

7:25 am-1:50 pm

2 stops21h 25m

$909

St. LouisOsaka

STL - KIX

STLKIX

Lambert-St Louis

Sun 2/15

2:19 pm-8:25 am

2 stops27h 06m

Osaka Kansai Intl

Sat 2/28

7:00 am-1:50 pm

2 stops21h 50m

$911

St. LouisOsaka

STL - ITM

STLITM

Lambert-St Louis

Sun 2/15

7:41 am-1:10 pm

2 stops38h 29m

Osaka Itami

Sat 2/28

2:05 pm-12:21 pm

2 stops37h 16m

$920

St. LouisOsaka

STL - ITM

STLITM

Lambert-St Louis

Thu 2/19

6:38 am-7:55 pm

2 stops22h 17m

Osaka Itami

Mon 2/23

4:30 pm-1:43 pm

2 stops36h 13m

$943

St. LouisOsaka

STL - ITM

STLITM

Lambert-St Louis

Sun 4/26

4:05 pm-6:55 pm

2 stops36h 50m

Osaka Itami

Sat 5/2

3:00 pm-8:04 pm

2 stops19h 04m

$954

St. LouisOsaka

STL - KIX

STLKIX

Lambert-St Louis

Sun 4/26

12:19 pm-2:50 pm

3 stops36h 31m

Osaka Kansai Intl

Sat 5/2

5:35 pm-10:59 pm

2 stops43h 24m

$1,347

St. LouisOsaka

STL - ITM

STLITM

Lambert-St Louis

Mon 3/30

6:00 am-7:50 pm

2 stops23h 50m

Osaka Itami

Fri 4/10

1:30 pm-7:30 pm

2 stops20h 00m

$1,917

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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How to get the cheapest flight ticket from St. Louis to Osaka

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

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

You could potentially save up to 3% on your flight if you consider stops on a St. Louis to Osaka flight.

When to book flights from St. Louis to Osaka

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

Cheap St. Louis to Osaka (STL to OSA) flight deals and tips

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

Fastest flight time

19h 32m

Direct flights

None
The fastest flight from St. Louis to Osaka takes 19h 32m
There are no direct flights from St. Louis to Osaka. There are no popular flight routes from St. Louis to Osaka.
Search flight deals

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

    The straight-line distance from Lambert-St Louis to Osaka is 6585.1 mi. 19h 32m is a normal flight duration for this route.

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

    Prices for flights from Lambert-St Louis Airport to Osaka are refreshed on a daily basis.

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

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Lambert-St Louis Airport to Osaka.

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

    The travel and health documents you'll need for your trip to Osaka may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Osaka. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

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

Traveling to a place near Osaka?

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

Why use momondo?

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

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from St. Louis to Osaka. momondo saves you time and could save you money on your trip.

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

Yes. momondo enables you to select and highlight flights to Osaka from St. Louis with this policy.

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

momondo helps you find the best flight between St. Louis and Osaka by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

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

If you are simply researching potential flights to Osaka, momondo offers a useful price alert feature which will track prices for flights to Osaka from St. Louis and alert you when they change.

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Find better results for your trip to Japan

Fly into one of these airports located in Osaka

Airports listed have a maximum distance of 22.5 mi from Osaka
Osaka Itami Airport
Osaka Kansai Intl Airport