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$372+ Cheap flights from St. Louis (STL) to Osaka (OSA)

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 8/23. Fares are subject to change and may not be available on all flights or dates of travel.
STL — OSA
Apr 6 — Apr 131
Sun 4/6
Sun 4/13
1 adult, Economy
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Cheap flight deals from St. Louis to Osaka

Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Osaka (OSA). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated April 1, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$785
(United)

One-way from

$372
(United Airlines)

Popular in

May

Cheapest in

September

Average price

$1,370
Provider with most accurate pricing for Lambert-St Louis-Osaka (OSA) flight deals.
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Provider most trusted by Cheapflights users for Lambert-St Louis-Osaka (OSA) flights.
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From Lambert-St Louis to Osaka (OSA)
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One-way flight from Lambert-St Louis to Osaka (OSA)
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Highest demand for flights based on searches. 24% potential increase in price ($413 potential increase over avg. RT price).
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Cheapest flight prices on average. 6% potential price decrease ($78 potential savings vs. average RT price).
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Average for round-trip flights in April 2025
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Find flight deals from St. Louis to Osaka

Cheapest flights from St. Louis to Osaka
Explore the most affordable flight options available from St. Louis to Osaka. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 1, 2025.

This Justfly.com deal was found by Cheapflights users on 3/31. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/296:15 amSTL - KIX
2 stops25h 35mANA
Wed 10/87:00 amKIX - STL
2 stops26h 25mANA
Deal found 3/31$740
This United Airlines deal was found by Cheapflights users on 3/31. 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 9/297:15 amSTL - KIX
1 stop17h 35mUnited Airlines
Wed 10/88:30 amKIX - STL
2 stops24h 55mUnited Airlines
Deal found 3/31$751
This United deal was found by Cheapflights users on 3/31. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/205:45 pmSTL - ITM
2 stops33h 20mUnited Airlines
Sun 9/2812:00 pmITM - STL
2 stops23h 04mUnited Airlines
Deal found 3/31$797
This CheapOair deal was found by Cheapflights users on 3/31. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/203:20 pmSTL - ITM
2 stops37h 50mANA
Sun 9/2810:00 amITM - STL
2 stops23h 25mANA
Deal found 3/31$808
This Air Canada deal was found by Cheapflights users on 3/31. 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 7/75:30 pmSTL - KIX
2 stops32h 55mAir Canada
Mon 9/86:05 pmKIX - STL
2 stops35h 11mAir Canada
Deal found 3/31$823
This FlightHub deal was found by Cheapflights users on 3/31. 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.
Mon 12/86:25 amSTL - KIX
2 stops24h 55mJapan Airlines
Sat 12/209:10 pmKIX - STL
2 stops28h 57mJapan Airlines
Deal found 3/31$824
This Booking.com deal was found by Cheapflights users on 3/30. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/204:05 pmSTL - ITM
3 stops36h 50mAir Canada
Sun 9/282:05 pmITM - STL
2 stops19h 52mAir Canada
Deal found 3/30$1,011
This American Airlines deal was found by Cheapflights users on 3/31. 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 7/76:25 amSTL - KIX
1 stop22h 20mAmerican Airlines
Mon 9/85:55 pmKIX - STL
1 stop19h 04mAmerican Airlines
Deal found 3/31$1,129
This Ovago deal was found by Cheapflights users on 3/31. 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.
Wed 6/118:35 amSTL - ITM
2 stops33h 00mJapan Airlines
Thu 6/262:35 pmITM - STL
2 stops36h 16mJapan Airlines
Deal found 3/31$1,289
This American Airlines deal was found by Cheapflights users on 3/30. 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 3/317:02 amSTL - ITM
2 stops22h 03mMultiple Airlines
Sun 4/68:30 amITM - STL
2 stops28h 46mMultiple Airlines
Deal found 3/30$1,474
This Gurufare deal was found by Cheapflights users on 3/31. 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 Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/207:59 pmSTL - KIX
3 stops28h 56mCathay Pacific
Sun 9/286:35 pmKIX - STL
2 stops41h 52mCathay Pacific
Deal found 3/31$1,507
This Mytrip deal was found by Cheapflights users on 3/31. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/207:30 amSTL - KIX
2 stops24h 20mMultiple Airlines
Wed 6/47:40 amKIX - STL
3 stops42h 56mMultiple Airlines
Deal found 3/31$1,583

Cheapflights 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, Cheapflights users made 2,558,603 searches. Data last updated April 1, 2025.
Use the filters below to find and compare flights from St. Louis to Osaka that are best for you.

Fly from

St. Louis

Fly to

Osaka

Route

Depart

Return

Price

St. LouisOsaka

STL - KIX

STLKIX

Lambert-St Louis

Sat 9/20

4:32 pm-2:50 pm

2 stops32h 18m

Osaka Kansai Intl

Sun 9/28

4:50 pm-2:18 pm

2 stops35h 28m

$785

St. LouisOsaka

STL - ITM

STLITM

Lambert-St Louis

Sat 9/20

5:45 pm-5:05 pm

2 stops33h 20m

Osaka Itami

Sun 9/28

12:00 pm-9:04 pm

2 stops23h 04m

$797

St. LouisOsaka

STL - ITM

STLITM

Lambert-St Louis

Sat 9/20

3:20 pm-7:10 pm

2 stops37h 50m

Osaka Itami

Sun 9/28

10:00 am-7:25 pm

2 stops23h 25m

$808

St. LouisOsaka

STL - KIX

STLKIX

Lambert-St Louis

Mon 7/7

5:30 pm-4:25 pm

2 stops32h 55m

Osaka Kansai Intl

Mon 9/8

6:05 pm-3:16 pm

2 stops35h 11m

$823

St. LouisOsaka

STL - KIX

STLKIX

Lambert-St Louis

Mon 7/7

8:26 am-8:25 am

2 stops33h 59m

Osaka Kansai Intl

Mon 9/8

5:55 pm-10:59 pm

1 stop19h 04m

$982

St. LouisOsaka

STL - ITM

STLITM

Lambert-St Louis

Sat 9/20

4:05 pm-6:55 pm

3 stops36h 50m

Osaka Itami

Sun 9/28

2:05 pm-7:57 pm

2 stops19h 52m

$1,011

St. LouisOsaka

STL - KIX

STLKIX

Lambert-St Louis

Mon 7/7

6:25 am-6:45 pm

1 stop22h 20m

Osaka Kansai Intl

Mon 9/8

5:55 pm-10:59 pm

1 stop19h 04m

$1,129

St. LouisOsaka

STL - ITM

STLITM

Lambert-St Louis

Wed 6/11

8:35 am-7:35 am

2 stops33h 00m

Osaka Itami

Thu 6/26

2:35 pm-12:51 pm

2 stops36h 16m

$1,289

St. LouisOsaka

STL - KIX

STLKIX

Lambert-St Louis

Sat 9/20

7:59 pm-2:55 pm

3 stops28h 56m

Osaka Kansai Intl

Sun 9/28

6:35 pm-10:27 pm

2 stops41h 52m

$1,507

St. LouisOsaka

STL - KIX

STLKIX

Lambert-St Louis

Tue 5/20

7:30 am-9:50 pm

2 stops24h 20m

Osaka Kansai Intl

Wed 6/4

7:40 am-12:36 pm

3 stops42h 56m

$1,583

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/31

Showing 1-10 of 21 results
1
2
3

Compare providers for flights from St. Louis to Osaka

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from St. Louis to Osaka in April.
ProviderPrice AccuracyTrust Score*
FlightHubPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy3 starsTrust Score*1 star

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on St. Louis-Osaka flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on St. Louis-Osaka flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from St. Louis-Osaka flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on St. Louis-Osaka flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for St. Louis-Osaka flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from St. Louis to Osaka

Have a flexible travel schedule? Discover the best time to fly to Osaka 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 Osaka

Rainfall in Osaka by month

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

In terms of precipitation, rainfall in Osaka ranges from 1.6 - 7.9 inches per month. June is typically the wettest month, when rainfall can reach 7.9 in. January is typically the driest time to visit Osaka when rainfall is around 1.6 in.

Temperature in Osaka by month

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

If weather is an important factor for your trip to Osaka, 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 84.2 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 Osaka

Get insights into the airlines that provide service to Osaka. 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 Osaka. Reviews last updated April 1, 2025.
See what other customers who have flown with Japan Airlines, ANA and Cathay Pacific from St. Louis to Osaka have to say. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Japan Airlines
8.3
Very good
1,440 reviews

Crew

8.7

Comfort

8.2

Food

7.7

Entertainment

7.8

Overall

8.3

Boarding

8.4

Reviews

1 / 20
8.0
Excellent

Diego,Nov 2024

HKG - NRT

overall very good; just found a bit poor the food options in Narita airport but the in the flight it was good but limited (no real choice to avoid seafood or clearly stay away from pork..); most of the food was tasty tho and the choice was nice, specially their snacks and dessert and drinks. The in-flight systems was so-so (too complicated interface; they should rehaul with a proper UIX), and I specially appreciated their segments of videos capsules about the behind the scenes including an overview of technicalities of their aircraft and days in the life of their pilots. It was refreshing and give a good ideas of the efforts and challenges every employees has to deal with. Loved it!
Japan Airlines
8.3
Very good
1,440 reviews
Japan Airlines
8.3
Very good
1,440 reviews

Crew

8.7

Comfort

8.2

Food

7.7

Entertainment

7.8

Overall

8.3

Boarding

8.4

Reviews

1 / 20
8.0
Excellent

Diego,Nov 2024

HKG - NRT

overall very good; just found a bit poor the food options in Narita airport but the in the flight it was good but limited (no real choice to avoid seafood or clearly stay away from pork..); most of the food was tasty tho and the choice was nice, specially their snacks and dessert and drinks. The in-flight systems was so-so (too complicated interface; they should rehaul with a proper UIX), and I specially appreciated their segments of videos capsules about the behind the scenes including an overview of technicalities of their aircraft and days in the life of their pilots. It was refreshing and give a good ideas of the efforts and challenges every employees has to deal with. Loved it!
ANA
8.3
Very good
831 reviews
Japan Airlines
8.3
Very good
1,440 reviews

Crew

8.7

Comfort

8.2

Food

7.7

Entertainment

7.8

Overall

8.3

Boarding

8.4

Reviews

1 / 20
8.0
Excellent

Diego,Nov 2024

HKG - NRT

overall very good; just found a bit poor the food options in Narita airport but the in the flight it was good but limited (no real choice to avoid seafood or clearly stay away from pork..); most of the food was tasty tho and the choice was nice, specially their snacks and dessert and drinks. The in-flight systems was so-so (too complicated interface; they should rehaul with a proper UIX), and I specially appreciated their segments of videos capsules about the behind the scenes including an overview of technicalities of their aircraft and days in the life of their pilots. It was refreshing and give a good ideas of the efforts and challenges every employees has to deal with. Loved it!
Cathay Pacific
7.5
Good
841 reviews
Japan Airlines
8.3
Very good
1,440 reviews

Crew

8.7

Comfort

8.2

Food

7.7

Entertainment

7.8

Overall

8.3

Boarding

8.4

Reviews

1 / 20
8.0
Excellent

Diego,Nov 2024

HKG - NRT

overall very good; just found a bit poor the food options in Narita airport but the in the flight it was good but limited (no real choice to avoid seafood or clearly stay away from pork..); most of the food was tasty tho and the choice was nice, specially their snacks and dessert and drinks. The in-flight systems was so-so (too complicated interface; they should rehaul with a proper UIX), and I specially appreciated their segments of videos capsules about the behind the scenes including an overview of technicalities of their aircraft and days in the life of their pilots. It was refreshing and give a good ideas of the efforts and challenges every employees has to deal with. Loved it!
Qatar Airways
7.4
Good
3,541 reviews
Japan Airlines
8.3
Very good
1,440 reviews

Crew

8.7

Comfort

8.2

Food

7.7

Entertainment

7.8

Overall

8.3

Boarding

8.4

Reviews

1 / 20
8.0
Excellent

Diego,Nov 2024

HKG - NRT

overall very good; just found a bit poor the food options in Narita airport but the in the flight it was good but limited (no real choice to avoid seafood or clearly stay away from pork..); most of the food was tasty tho and the choice was nice, specially their snacks and dessert and drinks. The in-flight systems was so-so (too complicated interface; they should rehaul with a proper UIX), and I specially appreciated their segments of videos capsules about the behind the scenes including an overview of technicalities of their aircraft and days in the life of their pilots. It was refreshing and give a good ideas of the efforts and challenges every employees has to deal with. Loved it!
United Airlines
7.4
Good
8,615 reviews
Japan Airlines
8.3
Very good
1,440 reviews

Crew

8.7

Comfort

8.2

Food

7.7

Entertainment

7.8

Overall

8.3

Boarding

8.4

Reviews

1 / 20
8.0
Excellent

Diego,Nov 2024

HKG - NRT

overall very good; just found a bit poor the food options in Narita airport but the in the flight it was good but limited (no real choice to avoid seafood or clearly stay away from pork..); most of the food was tasty tho and the choice was nice, specially their snacks and dessert and drinks. The in-flight systems was so-so (too complicated interface; they should rehaul with a proper UIX), and I specially appreciated their segments of videos capsules about the behind the scenes including an overview of technicalities of their aircraft and days in the life of their pilots. It was refreshing and give a good ideas of the efforts and challenges every employees has to deal with. Loved it!

Related info for your journey

Find useful and relevant information for your journey from St. Louis to Osaka. 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 Osaka?

    Located just 12.7 mi from the city center, Lambert-St Louis is the airport most travelers will use when flying to Osaka from St. Louis. Booking flights from Lambert-St Louis (STL) to Osaka should be relatively easy as there are 0 daily outbound flights to Osaka from 2 different airlines.

  • What are the cheapest airlines flying from St. Louis to Osaka round-trip?

    According to our current data, United Airlines ($785), ANA ($808), and Air Canada ($823) offers the cheapest pricing from St. Louis to Osaka. Users have found that United Airlines is 36% cheaper than the other options available to this destination.

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

    $372 is the cheapest one-way deal found within the past few days, from United Airlines. You may also be able to find cheap deals on American Airlines and Japan Airlines, with prices starting from $376 and $391, respectively.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from St. Louis to Osaka 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 Osaka?

    Currently, February is the cheapest month in which you can book a flight from St. Louis to Osaka (average of $898). Flying from St. Louis to Osaka in December is currently the most expensive (average of $1,350). 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

Traveling to a place near St. Louis?

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Nara
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Alternative routes for St. Louis to Osaka

See prices for flight routes from nearby airports that may be better suited for you.
St. Louis to Kansai Intl flights
Kansas City to Kansai Intl flights
Kansas City to Itami flights

Top 2 airlines flying from St. Louis to Osaka

Discover the top 2 airlines that operate flights from St. Louis to Osaka. 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 April 1, 2025.
AirlineCheapestAverageFlexibilityOn-time
Japan AirlinesCheapest$723Average$1,209FlexibilityNo cancel feeOn-time79%
United AirlinesCheapest$778Average$1,861FlexibilityNo cancel feeOn-time69%
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