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Cheap flights from St. Louis to Osaka from $370

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.
Air Canada Logo
4:05 pm - 7:10 pmSTL-ITM
36h 05m2 stops
Air Canada Logo
4:00 pm - 3:29 pmITM-STL
38h 29m2 stops
$684Air Canada
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Tue, Feb 3 - Thu, Feb 19
Air Canada Logo
4:05 pm - 7:25 pmSTL-KIX
36h 20m2 stops
Air Canada Logo
3:45 pm - 3:29 pmKIX-STL
38h 44m2 stops
$687Air Canada
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Tue, Feb 3 - Thu, Feb 19
ANA Logo
7:41 am - 6:55 pmSTL-ITM
20h 14m2 stops
ANA Logo
2:00 pm - 7:19 pmITM-STL
20h 19m2 stops
$690ANA
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Sun, Feb 15 - Sat, Feb 28
United Airlines Logo
6:42 pm - 4:40 pmSTL-KIX
30h 58m2 stops
United Airlines Logo
6:35 pm - 12:15 pmKIX-STL
32h 40m2 stops
$793United Airlines
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Mon, Dec 8 - Fri, Dec 12
Multiple Airlines Logo
4:05 pm - 10:20 pmSTL-KIX
39h 15m2 stops
Multiple Airlines Logo
3:00 pm - 3:29 pmKIX-STL
39h 29m2 stops
$804Multiple Airlines
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Mon, Dec 8 - Sat, Dec 20
ANA Logo
7:41 am - 10:20 pmSTL-KIX
23h 39m2 stops
ANA Logo
2:05 pm - 7:19 pmKIX-STL
20h 14m2 stops
$813ANA
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Sun, Feb 15 - Sat, Feb 28
Japan Airlines Logo
6:00 am - 8:25 amSTL-KIX
35h 25m2 stops
Japan Airlines Logo
5:50 pm - 11:48 pmKIX-STL
20h 58m1 stop
$852Japan Airlines
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Sun, Feb 15 - Sat, Feb 28
United Airlines Logo
4:45 pm - 4:40 pmSTL-KIX
32h 55m2 stops
United Airlines Logo
6:35 pm - 1:20 pmKIX-STL
33h 45m2 stops
$871United Airlines
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Mon, Dec 8 - Sat, Dec 20
Japan Airlines Logo
6:05 am - 10:15 pmSTL-KIX
26h 10m2 stops
Japan Airlines Logo
9:10 pm - 2:32 pmKIX-STL
31h 22m2 stops
$876Japan Airlines
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Tue, Mar 24 - Mon, Mar 30
Multiple Airlines Logo
6:30 am - 6:55 pmSTL-ITM
21h 25m3 stops
Multiple Airlines Logo
1:00 pm - 7:19 pmITM-STL
20h 19m2 stops
$1,016Multiple Airlines
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Tue, Mar 3 - Fri, Mar 13

United Airlines flights from St. Louis to Osaka

Our best United Airlines deals on St. Louis to Osaka flight tickets
United Airlines
Dec 8
STL6:42 pmLambert-St Louis
30h 58m
2 stops
KIX4:40 pmOsaka Kansai Intl
Dec 12
KIX6:35 pmOsaka Kansai Intl
32h 40m
2 stops
STL12:15 pmLambert-St Louis
$793
Find similar
United Airlines
Dec 8
STL4:45 pmLambert-St Louis
32h 55m
2 stops
KIX4:40 pmOsaka Kansai Intl
Dec 20
KIX6:35 pmOsaka Kansai Intl
33h 45m
2 stops
STL1:20 pmLambert-St Louis
$871
Find similar
United Airlines
Dec 8
STL5:30 pmLambert-St Louis
32h 10m
1 stop
KIX4:40 pmOsaka Kansai Intl
Dec 20
KIX6:35 pmOsaka Kansai Intl
33h 45m
2 stops
STL1:20 pmLambert-St Louis
$880
Find similar

American Airlines flights from St. Louis to Osaka

Our best American Airlines deals on St. Louis to Osaka flight tickets
American Airlines
Feb 15
STL6:30 amLambert-St Louis
21h 20m
1 stop
KIX6:50 pmOsaka Kansai Intl
Feb 28
KIX5:50 pmOsaka Kansai Intl
20h 58m
1 stop
STL11:48 pmLambert-St Louis
$850
Find similar
American Airlines
Feb 3
STL5:04 pmLambert-St Louis
34h 46m
2 stops
KIX6:50 pmOsaka Kansai Intl
Feb 19
KIX5:50 pmOsaka Kansai Intl
20h 58m
1 stop
STL11:48 pmLambert-St Louis
$855
Find similar
American Airlines
Dec 8
STL6:55 amLambert-St Louis
20h 55m
1 stop
KIX6:50 pmOsaka Kansai Intl
Dec 20
KIX5:50 pmOsaka Kansai Intl
21h 01m
1 stop
STL11:51 pmLambert-St Louis
$957
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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 November 6, 2025.
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 - ITM

STLITM

Lambert-St Louis

Tue 2/3

4:05 pm-7:10 pm

2 stops36h 05m

Osaka Itami

Thu 2/19

4:00 pm-3:29 pm

2 stops38h 29m

$684

St. LouisOsaka

STL - KIX

STLKIX

Lambert-St Louis

Tue 2/3

4:05 pm-7:25 pm

2 stops36h 20m

Osaka Kansai Intl

Thu 2/19

3:45 pm-3:29 pm

2 stops38h 44m

$687

St. LouisOsaka

STL - ITM

STLITM

Lambert-St Louis

Sun 2/15

7:41 am-6:55 pm

2 stops20h 14m

Osaka Itami

Sat 2/28

2:00 pm-7:19 pm

2 stops20h 19m

$690

St. LouisOsaka

STL - KIX

STLKIX

Lambert-St Louis

Mon 12/8

6:42 pm-4:40 pm

2 stops30h 58m

Osaka Kansai Intl

Fri 12/12

6:35 pm-12:15 pm

2 stops32h 40m

$793

St. LouisOsaka

STL - KIX

STLKIX

Lambert-St Louis

Mon 12/8

4:05 pm-10:20 pm

2 stops39h 15m

Osaka Kansai Intl

Sat 12/20

3:00 pm-3:29 pm

2 stops39h 29m

$804

St. LouisOsaka

STL - KIX

STLKIX

Lambert-St Louis

Sun 2/15

7:41 am-10:20 pm

2 stops23h 39m

Osaka Kansai Intl

Sat 2/28

2:05 pm-7:19 pm

2 stops20h 14m

$813

St. LouisOsaka

STL - KIX

STLKIX

Lambert-St Louis

Sun 2/15

6:00 am-8:25 am

2 stops35h 25m

Osaka Kansai Intl

Sat 2/28

5:50 pm-11:48 pm

1 stop20h 58m

$852

St. LouisOsaka

STL - KIX

STLKIX

Lambert-St Louis

Mon 12/8

4:45 pm-4:40 pm

2 stops32h 55m

Osaka Kansai Intl

Sat 12/20

6:35 pm-1:20 pm

2 stops33h 45m

$871

St. LouisOsaka

STL - KIX

STLKIX

Lambert-St Louis

Tue 3/24

6:05 am-10:15 pm

2 stops26h 10m

Osaka Kansai Intl

Mon 3/30

9:10 pm-2:32 pm

2 stops31h 22m

$876

St. LouisOsaka

STL - ITM

STLITM

Lambert-St Louis

Tue 3/3

6:30 am-6:55 pm

3 stops21h 25m

Osaka Itami

Fri 3/13

1:00 pm-7:19 pm

2 stops20h 19m

$1,016

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

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?

According to our data, Monday is the cheapest day to fly to Osaka from St. Louis. The lowest ticket price found for a Monday departure recently was $1,098. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. When flying out on a Wednesday, the most expensive travel day of the week, you can expect to see flight prices from St. Louis to Osaka for around $1,835.

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

You could potentially save up to 11% 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

Direct flights

None
There are no direct flights from St. Louis to Osaka. There are no popular flight routes from St. Louis to Osaka.
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  • How far is Lambert-St Louis to Osaka by plane?

    The straight-line distance from Lambert-St Louis to Osaka is 6585.1 mi. 20h 14m 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 many operators does momondo search for flights from Lambert-St Louis Airport to Osaka?

  • 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?

Best airlines flying from St. Louis to Osaka

Compare and see reviews for airlines that fly from St. Louis to Osaka with momondo
Airline
Rating
Free Cancellation
Price
Japan AirlinesPriceFrom $723Free CancellationRating
8.3
1,604 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
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