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

Air Canada, ANA, and United 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 46% 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 December 2025.

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.

$347 Cheap Flights from St. Louis to Japan in 2025/26

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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.

4:05 pm - 4:20 pm

STL

NRT

33h 15m2 stops

6:15 pm - 3:29 pm

NRT

STL

36h 14m2 stops

$642Air Canada

Mon, Feb 23 - Thu, Mar 5

4:05 pm - 4:20 pm

STL

NRT

33h 15m2 stops

6:45 pm - 10:36 am

NRT

STL

30h 51m2 stops

$653Air Canada

Mon, Feb 23 - Fri, Feb 27

4:05 pm - 4:20 pm

STL

NRT

33h 15m2 stops

6:45 pm - 10:36 am

NRT

STL

30h 51m2 stops

$654Air Canada

Fri, Feb 20 - Fri, Feb 27

8:30 am - 4:50 pm

STL

HND

17h 20m1 stop

6:25 pm - 11:51 pm

HND

STL

19h 26m1 stop

$698United Airlines

Sat, Feb 28 - Tue, Mar 10

6:35 am - 5:45 pm

STL

HND

20h 10m1 stop

4:25 pm - 8:43 pm

HND

STL

19h 18m1 stop

$699Delta

Wed, Feb 25 - Sat, Mar 7

9:32 am - 6:30 pm

STL

HND

17h 58m1 stop

8:25 pm - 11:28 pm

HND

STL

18h 03m2 stops

$701American Airlines

Mon, Feb 23 - Thu, Mar 5

7:15 am - 7:55 pm

STL

ITM

21h 40m2 stops

2:40 pm - 7:29 pm

ITM

STL

19h 49m2 stops

$756American Airlines

Tue, Jan 13 - Tue, Jan 20

9:57 am - 6:30 pm

STL

FUK

41h 33m2 stops

12:40 pm - 9:13 pm

FUK

STL

23h 33m2 stops

$791United Airlines

Sun, Jan 18 - Thu, Jan 22

6:30 am - 6:50 pm

STL

KIX

21h 20m1 stop

5:50 pm - 11:48 pm

KIX

STL

20h 58m1 stop

$824Japan Airlines

Sun, Feb 15 - Sat, Feb 28

7:15 am - 7:20 pm

STL

ITM

21h 05m2 stops

2:40 pm - 10:46 pm

ITM

STL

23h 06m2 stops

$901Japan Airlines

Thu, Jan 8 - Fri, Jan 16

ANA flights from St. Louis to Japan

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

ANA

Feb 23

STL8:17 amLambert-St Louis

18h 28m

1 stop

HND5:45 pmTokyo Haneda

Mar 5

HND6:20 pmTokyo Haneda

15h 54m

1 stop

STL7:14 pmLambert-St Louis

$690

Find similar

ANA

Feb 3

STL6:30 amLambert-St Louis

34h 40m

2 stops

ITM8:10 amOsaka Itami

Feb 19

ITM8:00 amOsaka Itami

19h 21m

2 stops

STL12:21 pmLambert-St Louis

$730

Find similar

ANA

Jan 12

STL6:00 amLambert-St Louis

18h 30m

1 stop

NRT3:30 pmTokyo Narita

Jan 19

NRT5:45 pmTokyo Narita

37h 07m

1 stop

STL3:52 pmLambert-St Louis

$797

Find similar

Japan Airlines flights from St. Louis to Japan

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

Japan 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

$824

Find similar

Japan Airlines

Feb 3

STL7:04 amLambert-St Louis

24h 16m

2 stops

KIX10:20 pmOsaka 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

STL6:30 amLambert-St Louis

21h 20m

1 stop

KIX6:50 pmOsaka Kansai Intl

Feb 28

KIX7:00 amOsaka Kansai Intl

21h 56m

2 stops

STL1:56 pmLambert-St Louis

$831

Find similar

Fly from

Fly to

Route

Depart

Return

Price

St. LouisTokyo

STL - NRT

STLNRT

Lambert-St Louis

Mon 2/23

4:05 pm-4:20 pm

2 stops33h 15m

Tokyo Narita

Thu 3/5

6:15 pm-3:29 pm

2 stops36h 14m

$642

St. LouisTokyo

STL - NRT

STLNRT

Lambert-St Louis

Mon 2/23

4:05 pm-4:20 pm

2 stops33h 15m

Tokyo Narita

Fri 2/27

6:45 pm-10:36 am

2 stops30h 51m

$653

St. LouisTokyo

STL - NRT

STLNRT

Lambert-St Louis

Fri 2/20

4:05 pm-4:20 pm

2 stops33h 15m

Tokyo Narita

Fri 2/27

6:45 pm-10:36 am

2 stops30h 51m

$654

St. LouisTokyo

STL - HND

STLHND

Lambert-St Louis

Sat 2/28

8:30 am-4:50 pm

1 stop17h 20m

Tokyo Haneda

Tue 3/10

6:25 pm-11:51 pm

1 stop19h 26m

$698

St. LouisTokyo

STL - HND

STLHND

Lambert-St Louis

Wed 2/25

6:35 am-5:45 pm

1 stop20h 10m

Tokyo Haneda

Sat 3/7

4:25 pm-8:43 pm

1 stop19h 18m

$699

St. LouisTokyo

STL - HND

STLHND

Lambert-St Louis

Mon 2/23

9:32 am-6:30 pm

1 stop17h 58m

Tokyo Haneda

Thu 3/5

8:25 pm-11:28 pm

2 stops18h 03m

$701

St. LouisOsaka

STL - ITM

STLITM

Lambert-St Louis

Tue 1/13

7:15 am-7:55 pm

2 stops21h 40m

Osaka Itami

Tue 1/20

2:40 pm-7:29 pm

2 stops19h 49m

$756

St. LouisFukuoka

STL - FUK

STLFUK

Lambert-St Louis

Sun 1/18

9:57 am-6:30 pm

2 stops41h 33m

Fukuoka

Thu 1/22

12:40 pm-9:13 pm

2 stops23h 33m

$791

St. LouisOsaka

STL - KIX

STLKIX

Lambert-St Louis

Sun 2/15

6:30 am-6:50 pm

1 stop21h 20m

Osaka Kansai Intl

Sat 2/28

5:50 pm-11:48 pm

1 stop20h 58m

$824

St. LouisOsaka

STL - ITM

STLITM

Lambert-St Louis

Thu 1/8

7:15 am-7:20 pm

2 stops21h 05m

Osaka Itami

Fri 1/16

2:40 pm-10:46 pm

2 stops23h 06m

$901

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 September is, on average, the cheapest month to fly to Japan from St. Louis, with most prices found around $738. If you aren’t able to travel to Japan during the month of September, then flying in January is also cheap. Prices for this month can be found on momondo for an average of $791.

What is the cheapest day to depart on your flight to Japan?

On average, the least expensive day to fly to Japan from St. Louis is on a Wednesday. momondo users have found tickets for Wednesday departures for as low as $1,209. However, this price may fluctuate depending on the airline, the season, and holidays. Flights from St. Louis to Japan on a Friday will generally be more expensive and average around $1,457. 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 Japan?

Flying to Japan from St. Louis at noon is the least expensive time of day to depart. momondo users have found prices as low as $1,103 when looking at flights departing at noon. In the morning is when there is more demand to fly to Japan, so prices are often more expensive at around $1,308 per ticket.

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

You could potentially save up to 22% 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	16h 19m
Direct flights	None

The fastest flight from St. Louis to Japan takes 16h 19m

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

Search flight deals

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 December 2025.
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
Air Canada	PriceFrom $629	Free Cancellation	Rating 7.1 10,534 reviews	Search Air Canada flights
American Airlines	PriceFrom $633	Free Cancellation	Rating 7.2 11,054 reviews	Search American Airlines flights
Japan Airlines	PriceFrom $691	Free Cancellation	Rating 8.3 1,662 reviews	Search Japan Airlines flights
ANA	PriceFrom $703	Free Cancellation	Rating 8.4 1,031 reviews	Search ANA flights
United Airlines	PriceFrom $716	Free Cancellation	Rating 7.4 9,095 reviews	Search United Airlines flights
Delta	PriceFrom $722	Free Cancellation	Rating 7.9 8,008 reviews	Search Delta 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.