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$416+ Cheap flights from St. Louis (STL) to Japan

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 11/1. Fares are subject to change and may not be available on all flights or dates of travel.
STL — FUK
Jun 17 — Jun 241
Tue 6/17
Tue 6/24
1 adult, Economy
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Cheap flight deals from St. Louis to Japan

Keep the following information in mind while searching for St. Louis to Japan flight deals. Data was last updated June 12, 2025.

Round-trip from

$769
(Air Canada)

One-way from

$416
(Air Canada)

Popular in

June

Cheapest in

September

Average price

$1,311
From Lambert-St Louis to Japan
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One-way flight from Lambert-St Louis to Japan
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Highest demand for flights based on searches. 16% potential increase in price ($192 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($28 potential savings vs. average RT price).
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Average for round-trip flights in June 2025
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Find flight deals from St. Louis to Japan

Cheapest flights from St. Louis to Japan
Explore the most affordable flight options available from St. Louis to Japan. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 12, 2025.

This Air Canada deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/209:15 amSTL - KIX
1 stop17h 10mAir Canada
Sun 9/286:05 pmKIX - STL
2 stops30h 44mAir Canada
Deal found 6/12$624
This United Airlines deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/205:47 pmSTL - KIX
1 stop31h 03mUnited Airlines
Tue 10/288:25 amKIX - STL
2 stops29h 19mUnited Airlines
Deal found 6/12$709
This Air Canada deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/84:15 pmSTL - KIX
2 stops39h 05mMultiple Airlines
Sat 12/203:40 pmKIX - STL
2 stops38h 46mMultiple Airlines
Deal found 6/11$756
This FlightHub deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/129:20 amSTL - FUK
2 stops33h 20mANA
Thu 10/307:00 amFUK - STL
2 stops19h 13mANA
Deal found 6/11$772
This Air Canada deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/184:05 pmSTL - FUK
2 stops37h 45mAir Canada
Mon 9/222:20 pmFUK - STL
2 stops38h 58mAir Canada
Deal found 6/12$827
This FlightHub deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/209:15 amSTL - ITM
2 stops19h 55mAir Canada
Sun 9/282:05 pmITM - STL
2 stops19h 33mAir Canada
Deal found 6/10$850
This Ovago deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/146:15 amSTL - ITM
2 stops23h 05mANA
Sat 11/227:05 amITM - STL
2 stops23h 45mANA
Deal found 6/11$900
This Trip.com deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/1912:25 pmSTL - ITM
2 stops40h 30mMultiple Airlines
Tue 10/282:00 pmITM - STL
2 stops23h 44mMultiple Airlines
Deal found 6/12$904
This United Airlines deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/1212:25 pmSTL - FUK
2 stops63h 15mUnited Airlines
Thu 10/3012:30 pmFUK - STL
3 stops40h 59mUnited Airlines
Deal found 6/11$911
This American Airlines deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/78:50 amSTL - KIX
1 stop19h 55mAmerican Airlines
Mon 9/85:55 pmKIX - STL
1 stop19h 04mAmerican Airlines
Deal found 6/12$953
This Travelocity deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/235:18 pmSTL - NRT
2 stops55h 42mAir Canada
Sat 1/106:00 pmNRT - STL
2 stops36h 21mAir Canada
Deal found 6/11$957
This United Airlines deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/275:15 amSTL - HND
2 stops20h 00mUnited Airlines
Thu 8/285:15 pmHND - STL
1 stop18h 17mUnited Airlines
Deal found 6/11$959

Cheapflights Fare Finder

Customize your flight search to find flights from St. Louis to Japan 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, Cheapflights users made 2,558,603 searches. Data last updated June 12, 2025.
Use the filters below to find and compare flights from St. Louis to Japan that are best for you.

Fly from

St. Louis

Fly to

Japan

Route

Depart

Return

Price

St. LouisOsaka

STL - KIX

STLKIX

Lambert-St Louis

Mon 7/7

5:00 am-4:25 pm

2 stops21h 25m

Osaka Kansai Intl

Mon 9/8

6:05 pm-7:57 pm

2 stops39h 52m

$769

St. LouisFukuoka

STL - FUK

STLFUK

Lambert-St Louis

Fri 8/29

9:17 am-5:35 pm

2 stops42h 18m

Fukuoka

Fri 9/5

11:40 am-7:27 pm

2 stops21h 47m

$923

St. LouisOsaka

STL - KIX

STLKIX

Lambert-St Louis

Mon 7/7

8:50 am-6:45 pm

1 stop19h 55m

Osaka Kansai Intl

Mon 9/8

5:55 pm-10:59 pm

1 stop19h 04m

$953

St. LouisTokyo

STL - HND

STLHND

Lambert-St Louis

Wed 8/27

5:15 am-3:15 pm

2 stops20h 00m

Tokyo Haneda

Thu 8/28

5:15 pm-9:32 pm

1 stop18h 17m

$959

St. LouisTokyo

STL - NRT

STLNRT

Lambert-St Louis

Sun 7/20

1:30 pm-2:55 pm

2 stops59h 25m

Tokyo Narita

Sat 7/26

5:05 pm-12:46 pm

2 stops33h 41m

$962

St. LouisTokyo

STL - NRT

STLNRT

Lambert-St Louis

Sat 10/4

3:57 pm-4:00 pm

1 stop34h 03m

Tokyo Narita

Mon 10/20

6:25 pm-11:59 pm

1 stop19h 34m

$965

St. LouisTokyo

STL - NRT

STLNRT

Lambert-St Louis

Wed 8/27

5:15 am-2:00 pm

2 stops18h 45m

Tokyo Narita

Thu 8/28

5:00 pm-11:53 pm

2 stops20h 53m

$967

St. LouisTokyo

STL - NRT

STLNRT

Lambert-St Louis

Wed 10/8

12:25 pm-3:00 pm

1 stop36h 35m

Tokyo Narita

Mon 10/13

5:00 pm-2:27 pm

1 stop35h 27m

$971

St. LouisTokyo

STL - HND

STLHND

Lambert-St Louis

Fri 7/25

9:15 am-3:50 pm

1 stop16h 35m

Tokyo Haneda

Wed 8/13

6:10 pm-8:00 pm

2 stops39h 50m

$981

St. LouisTokyo

STL - NRT

STLNRT

Lambert-St Louis

Sun 11/9

7:15 am-3:30 pm

1 stop17h 15m

Tokyo Narita

Wed 11/12

6:10 pm-9:41 pm

2 stops18h 31m

$984

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/10

Showing 1-10 of 58 results
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Best time to book a flight from St. Louis to Japan

Have a flexible travel schedule? Discover the best time to fly to Japan from St. Louis with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from St. Louis to Japan

What is the cheapest month to book a flight from St. Louis to Japan?

Currently, February is the cheapest month in which you can book a flight from St. Louis to Japan (average of $871). Flying from St. Louis to Japan in December is currently the most expensive (average of $1,625). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from STL to JP?

Find hourly flight availability from St. Louis to Japan. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated June 12, 2025.

When flying from St. Louis to Japan, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Rainfall in Japan by month

Plan your trip to Japan by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Japan ranges from 2.0 - 8.3 inches per month. September is typically the wettest month, when rainfall can reach 8.3 in. January is typically the driest time to visit Japan when rainfall is around 2.0 in.

Temperature in Japan by month

Plan your trip to Japan by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Japan, use this chart to help with planning. For those seeking warmer temperatures, August is the ideal time of year to visit, when temperatures reach an average of 80.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 42.8 F).

Reviews of airlines servicing Japan

Get insights into the airlines that provide service to Japan. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Japan. Reviews last updated June 12, 2025.
To help decide which airline to fly from St. Louis to Japan, see what other customers have to say about Korean Air, Japan Airlines and ANA. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Korean Air
8.4
Very good
1,088 reviews

Boarding

8.5

Comfort

8.3

Food

8.1

Overall

8.4

Entertainment

8.2

Crew

8.7

Reviews

1 / 20
10.0
Excellent

Chris,Mar 2025

SEA - ICN

Was told the flight was overbooked so they selected only a few people to weight their bags and we were forced to check our luggage. We Once we got seated on the flight there were many seats vacant and our overhead bin was completely open. Both our luggage and our carryon were small. We had booked our tickets months in advance and we watched people carry two small suitcases on without one word to them. Am I upset?? Yes it was disappointing.
Korean Air
8.4
Very good
1,088 reviews
Korean Air
8.4
Very good
1,088 reviews

Boarding

8.5

Comfort

8.3

Food

8.1

Overall

8.4

Entertainment

8.2

Crew

8.7

Reviews

1 / 20
10.0
Excellent

Chris,Mar 2025

SEA - ICN

Was told the flight was overbooked so they selected only a few people to weight their bags and we were forced to check our luggage. We Once we got seated on the flight there were many seats vacant and our overhead bin was completely open. Both our luggage and our carryon were small. We had booked our tickets months in advance and we watched people carry two small suitcases on without one word to them. Am I upset?? Yes it was disappointing.
Japan Airlines
8.3
Very good
1,489 reviews
Korean Air
8.4
Very good
1,088 reviews

Boarding

8.5

Comfort

8.3

Food

8.1

Overall

8.4

Entertainment

8.2

Crew

8.7

Reviews

1 / 20
10.0
Excellent

Chris,Mar 2025

SEA - ICN

Was told the flight was overbooked so they selected only a few people to weight their bags and we were forced to check our luggage. We Once we got seated on the flight there were many seats vacant and our overhead bin was completely open. Both our luggage and our carryon were small. We had booked our tickets months in advance and we watched people carry two small suitcases on without one word to them. Am I upset?? Yes it was disappointing.
ANA
8.3
Very good
882 reviews
Korean Air
8.4
Very good
1,088 reviews

Boarding

8.5

Comfort

8.3

Food

8.1

Overall

8.4

Entertainment

8.2

Crew

8.7

Reviews

1 / 20
10.0
Excellent

Chris,Mar 2025

SEA - ICN

Was told the flight was overbooked so they selected only a few people to weight their bags and we were forced to check our luggage. We Once we got seated on the flight there were many seats vacant and our overhead bin was completely open. Both our luggage and our carryon were small. We had booked our tickets months in advance and we watched people carry two small suitcases on without one word to them. Am I upset?? Yes it was disappointing.
Alaska Airlines
8.0
Very good
10,000 reviews
Korean Air
8.4
Very good
1,088 reviews

Boarding

8.5

Comfort

8.3

Food

8.1

Overall

8.4

Entertainment

8.2

Crew

8.7

Reviews

1 / 20
10.0
Excellent

Chris,Mar 2025

SEA - ICN

Was told the flight was overbooked so they selected only a few people to weight their bags and we were forced to check our luggage. We Once we got seated on the flight there were many seats vacant and our overhead bin was completely open. Both our luggage and our carryon were small. We had booked our tickets months in advance and we watched people carry two small suitcases on without one word to them. Am I upset?? Yes it was disappointing.
Delta
8.0
Very good
7,950 reviews
Korean Air
8.4
Very good
1,088 reviews

Boarding

8.5

Comfort

8.3

Food

8.1

Overall

8.4

Entertainment

8.2

Crew

8.7

Reviews

1 / 20
10.0
Excellent

Chris,Mar 2025

SEA - ICN

Was told the flight was overbooked so they selected only a few people to weight their bags and we were forced to check our luggage. We Once we got seated on the flight there were many seats vacant and our overhead bin was completely open. Both our luggage and our carryon were small. We had booked our tickets months in advance and we watched people carry two small suitcases on without one word to them. Am I upset?? Yes it was disappointing.

Related info for your journey

Find useful and relevant information for your journey from St. Louis to Japan. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from St. Louis to Japan?

    Most people fly from Lambert-St Louis (STL) if they book a flight from St. Louis to Japan. Lambert-St Louis is conveniently located just 12.7 mi from St. Louis’s city center.

  • What are the cheapest airlines to fly from St. Louis to Japan one-way?

    The cheapest airlines for a one-way flight from St. Louis to Japan are Air Canada ($416), Alaska Airlines ($429), and United Airlines ($433).

  • What are the most popular routes from St. Louis to Japan?

    While some choose either Lambert-St Louis - Tokyo Haneda or Lambert-St Louis - Osaka Kansai Intl, Lambert-St Louis - Tokyo Narita is the most popular route from St. Louis to Japan.

  • Can I find deals for flights from St. Louis to Japan that include hotel bookings?

    Yes. In addition to deals on St. Louis to Japan flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from St. Louis to Japan?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from St. Louis to Japan.

  • Can I find deals for business class flights from St. Louis to Japan?

    Yes. Cheapflights offers flight deals from St. Louis to Japan by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from St. Louis to Japan?

    Currently, February is the cheapest month in which you can book a flight from St. Louis to Japan (average of $871). Flying from St. Louis to Japan in December is currently the most expensive (average of $1,625). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

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Alternative routes for St. Louis to Japan

See prices for flight routes from nearby airports that may be better suited for you.
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Top 6 airlines flying from St. Louis to Japan

Discover the top 6 airlines that operate flights from St. Louis to Japan. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated June 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$629Average$945FlexibilityNo cancel feeOn-time67%
Japan AirlinesCheapest$691Average$931FlexibilityNo cancel feeOn-time79%
American AirlinesCheapest$720Average$1,088FlexibilityNo cancel feeOn-time71%
ANACheapest$729Average$1,110FlexibilityNo cancel feeOn-time80%
DeltaCheapest$734Average$1,385FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$739Average$1,137FlexibilityNo cancel feeOn-time69%

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