What is the cheapest airline that flies from Lambert-St Louis to Japan?

Japan Airlines, United Airlines, and American Airlines are the most popular carriers operating from Lambert-St Louis to Japan

What airlines fly to Japan?

United Airlines, Delta and American Airlines are the top three most popular airlines that fly to Japan from St. Louis according to our data. United Airlines is the first choice among our users, with 38% of people opting to fly with this airline when traveling to Japan. Keep in mind that there are 6 different airlines that fly to Japan on a routine basis, so you have a few additional options to choose from.

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

Prices for flights from Lambert-St Louis Airport to Japan were last updated today.

How many operators does momondo search for flights from Lambert-St Louis Airport to Japan?

There are 6 operators available for flights from Lambert-St Louis Airport to Japan as of April 2026.

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

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 Japan.

What documentation or ID do you need to fly to Japan?

The necessary travel and health documents for your Japan 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.

$484 Cheap Flights from St. Louis to Japan in 2026

1 adult

0 bags

Discover deals from 900+ travel sites with momondo.

Save money when you book flights with momondo

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Not ready to book? to track prices.

Search flight deals

Find the cheapest flights from St. Louis to Japan

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

6:00 am - 8:35 am

STL

KIX

36h 35m

2 stops

5:45 pm - 10:55 pm

KIX

STL

19h 10m

1 stop

$1,006Japan Airlines

Wed, Aug 5 - Fri, Aug 14

6:00 am - 6:45 pm

STL

KIX

22h 45m

1 stop

5:45 pm - 10:55 pm

KIX

STL

19h 10m

1 stop

$1,007Japan Airlines

Wed, Aug 5 - Fri, Aug 14

8:00 am - 8:35 pm

STL

ITM

22h 35m

2 stops

12:00 pm - 7:31 pm

ITM

STL

21h 31m

2 stops

$1,142ANA

Tue, Sep 15 - Tue, Sep 22

5:10 am - 2:50 pm

STL

KIX

19h 40m

2 stops

4:55 pm - 6:24 pm

KIX

STL

15h 29m

1 stop

$1,160United Airlines

Tue, Sep 15 - Tue, Sep 22

7:00 am - 2:50 pm

STL

KIX

17h 50m

1 stop

9:20 am - 9:24 pm

KIX

STL

26h 04m

2 stops

$1,207United Airlines

Wed, Sep 30 - Sat, Oct 17

12:10 pm - 2:55 pm

STL

NRT

36h 45m

2 stops

4:50 pm - 6:41 pm

NRT

STL

39h 51m

2 stops

$1,281Air Canada

Mon, Oct 12 - Thu, Oct 22

6:58 pm - 1:05 pm

STL

HND

28h 07m

2 stops

6:25 pm - 9:31 am

HND

STL

29h 06m

1 stop

$1,283Delta

Wed, Jul 15 - Sat, Jul 25

5:42 pm - 1:05 pm

STL

HND

29h 23m

2 stops

4:35 pm - 12:41 am

HND

STL

22h 06m

2 stops

$1,285Delta

Sat, Jul 18 - Wed, Jul 22

2:40 pm - 2:55 pm

STL

NRT

34h 15m

2 stops

5:50 pm - 6:41 pm

NRT

STL

38h 51m

1 stop

$1,286Air Canada

Tue, Sep 22 - Wed, Oct 7

10:23 am - 9:15 pm

STL

HND

20h 52m

1 stop

10:50 am - 4:35 pm

HND

STL

19h 45m

1 stop

$1,292ANA

Wed, Oct 14 - Wed, Oct 28

United Airlines flights from St. Louis to Japan

Our best United Airlines deals on St. Louis to Japan flight tickets

United Airlines

Sep 15

STL5:10 amLambert-St Louis

19h 40m

2 stops

KIX2:50 pmOsaka Kansai Intl

Sep 22

KIX4:55 pmOsaka Kansai Intl

15h 29m

1 stop

STL6:24 pmLambert-St Louis

$1,160

United Airlines

Sep 30

STL7:00 amLambert-St Louis

17h 50m

1 stop

KIX2:50 pmOsaka Kansai Intl

Oct 17

KIX9:20 amOsaka Kansai Intl

26h 04m

2 stops

STL9:24 pmLambert-St Louis

$1,207

United Airlines

Sep 30

STL7:00 amLambert-St Louis

20h 05m

2 stops

ITM5:05 pmOsaka Itami

Oct 17

ITM12:55 pmOsaka Itami

22h 29m

2 stops

STL9:24 pmLambert-St Louis

$1,211

ANA flights from St. Louis to Japan

Our best ANA deals on St. Louis to Japan flight tickets

ANA

Sep 15

STL8:00 amLambert-St Louis

22h 35m

2 stops

ITM8:35 pmOsaka Itami

Sep 22

ITM12:00 pmOsaka Itami

21h 31m

2 stops

STL7:31 pmLambert-St Louis

$1,142

ANA

May 6

STL9:21 amLambert-St Louis

16h 04m

1 stop

HND3:25 pmTokyo Haneda

Jun 17

HND5:15 pmTokyo Haneda

32h 56m

1 stop

STL12:11 pmLambert-St Louis

$1,286

ANA

Oct 7

STL10:23 amLambert-St Louis

20h 52m

1 stop

HND9:15 pmTokyo Haneda

Oct 22

HND10:40 amTokyo Haneda

15h 40m

1 stop

STL12:20 pmLambert-St Louis

$1,292

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

St. LouisOsaka

STL - KIX

STLKIX

Lambert-St Louis

Wed 8/5

6:00 am-8:35 am

2 stops36h 35m

Osaka Kansai Intl

Fri 8/14

5:45 pm-10:55 pm

1 stop19h 10m

$1,006

St. LouisOsaka

STL - KIX

STLKIX

Lambert-St Louis

Wed 8/5

6:00 am-6:45 pm

1 stop22h 45m

Osaka Kansai Intl

Fri 8/14

5:45 pm-10:55 pm

1 stop19h 10m

$1,007

St. LouisOsaka

STL - ITM

STLITM

Lambert-St Louis

Tue 9/15

8:00 am-8:35 pm

2 stops22h 35m

Osaka Itami

Tue 9/22

12:00 pm-7:31 pm

2 stops21h 31m

$1,142

Quickest round-trip

St. LouisOsaka

STL - KIX

STLKIX

Lambert-St Louis

Tue 9/15

5:10 am-2:50 pm

2 stops19h 40m

Osaka Kansai Intl

Tue 9/22

4:55 pm-6:24 pm

1 stop15h 29m

$1,160

St. LouisOsaka

STL - KIX

STLKIX

Lambert-St Louis

Wed 9/30

7:00 am-2:50 pm

1 stop17h 50m

Osaka Kansai Intl

Sat 10/17

9:20 am-9:24 pm

2 stops26h 04m

$1,207

St. LouisTokyo

STL - NRT

STLNRT

Lambert-St Louis

Mon 10/12

12:10 pm-2:55 pm

2 stops36h 45m

Tokyo Narita

Thu 10/22

4:50 pm-6:41 pm

2 stops39h 51m

$1,281

St. LouisTokyo

STL - HND

STLHND

Lambert-St Louis

Wed 7/15

6:58 pm-1:05 pm

2 stops28h 07m

Tokyo Haneda

Sat 7/25

6:25 pm-9:31 am

1 stop29h 06m

$1,283

St. LouisTokyo

STL - HND

STLHND

Lambert-St Louis

Sat 7/18

5:42 pm-1:05 pm

2 stops29h 23m

Tokyo Haneda

Wed 7/22

4:35 pm-12:41 am

2 stops22h 06m

$1,285

St. LouisTokyo

STL - NRT

STLNRT

Lambert-St Louis

Tue 9/22

2:40 pm-2:55 pm

2 stops34h 15m

Tokyo Narita

Wed 10/7

5:50 pm-6:41 pm

1 stop38h 51m

$1,286

St. LouisTokyo

STL - HND

STLHND

Lambert-St Louis

Wed 10/14

10:23 am-9:15 pm

1 stop20h 52m

Tokyo Haneda

Wed 10/28

10:50 am-4:35 pm

1 stop19h 45m

$1,292

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from St. Louis to Japan

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

Prices

Airlines

What is the cheapest month to fly to Japan?

The month of March is, on average, the cheapest month to fly to Japan from St. Louis, with most prices found around $349. If you aren’t able to travel to Japan during the month of March, then flying in May is also cheap. Prices for this month can be found on momondo for an average of $383.

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

You could potentially save up to 11% on your flight if you consider stops on a St. Louis to Japan flight.

Cheap St. Louis to Japan flight deals and tips

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

Fastest flight time	15h 28m
Direct flights	None

The fastest flight from St. Louis to Japan takes 15h 28m

There are no direct flights from St. Louis to Japan. There are no popular flight routes from St. Louis to Japan.

Search flight deals

Frequently asked questions about flying from St. Louis to Japan

When did momondo last update prices for flights from Lambert-St Louis Airport to Japan?
Prices for flights from Lambert-St Louis Airport to Japan were last updated today.
How many operators does momondo search for flights from Lambert-St Louis Airport to Japan?
There are 6 operators available for flights from Lambert-St Louis Airport to Japan as of April 2026.
How old do you have to be to fly from Lambert-St Louis Airport to Japan?
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 Japan.
What documentation or ID do you need to fly to Japan?
The necessary travel and health documents for your Japan 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.

Best airlines flying from St. Louis to Japan

Compare and see reviews for airlines that fly from St. Louis to Japan with momondo

Airline	Rating	Free Cancellation	Price
American Airlines	PriceFrom $593	Free Cancellation	Rating 7.1 11,681 reviews	Search American Airlines flights
Air Canada	PriceFrom $629	Free Cancellation	Rating 7.1 10,982 reviews	Search Air Canada flights
Delta	PriceFrom $643	Free Cancellation	Rating 7.9 8,464 reviews	Search Delta flights
ANA	PriceFrom $703	Free Cancellation	Rating 8.3 1,201 reviews	Search ANA flights
United Airlines	PriceFrom $747	Free Cancellation	Rating 7.4 9,677 reviews	Search United Airlines flights
Japan Airlines	PriceFrom $846	Free Cancellation	Rating 8.3 1,797 reviews	Search Japan Airlines flights

Why use momondo?

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

Finding the right flight to Japan from St. Louis is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to Japan quick and easy, saving you time and money.

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

momondo does allow users to show only those flights to Japan from St. Louis which offer a flexible booking policy as well as other useful filters and features.

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

Once you have performed a search for St. Louis to Japan flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

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

Yes momondo offers price alerts on flights to Japan from St. Louis. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.