HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Osaka

$403+ 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 3/7. Fares are subject to change and may not be available on all flights or dates of travel.
STL — OSA
Oct 17 — Oct 241
Fri 10/17
Fri 10/24
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from St. Louis to Osaka with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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 September 17, 2025.

Round-trip from

$723
(United Airlines)

One-way from

$403
(Air Canada)

Popular in

May

Cheapest in

September

Average price

$757
From Lambert-St Louis to Osaka (OSA)
Search Deals
One-way flight from Lambert-St Louis to Osaka (OSA)
Search Deals
Highest demand for flights based on searches. 21% potential increase in price ($310 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($64 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in September 2025
Search Deals

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 September 17, 2025.

This United Airlines deal was found by Cheapflights users on 9/15. 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 9/157:04 pmSTL - KIX
2 stops29h 46mUnited Airlines
Thu 9/254:50 pmKIX - STL
2 stops19h 10mUnited Airlines
Deal found 9/15$729
This United Airlines deal was found by Cheapflights users on 9/14. 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.
Sat 9/275:11 pmSTL - KIX
2 stops31h 39mUnited Airlines
Wed 10/14:50 pmKIX - STL
2 stops21h 08mUnited Airlines
Deal found 9/14$741
This FlightHub deal was found by Cheapflights users on 9/16. 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 12/83:22 pmSTL - KIX
2 stops31h 53mJapan Airlines
Sat 12/207:00 amKIX - STL
2 stops24h 46mJapan Airlines
Deal found 9/16$748
This United Airlines deal was found by Cheapflights users on 9/15. 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 9/155:49 pmSTL - ITM
2 stops33h 16mUnited Airlines
Mon 9/2212:00 pmITM - STL
2 stops44h 58mUnited Airlines
Deal found 9/15$752
This United Airlines deal was found by Cheapflights users on 9/15. 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.
Thu 9/185:15 amSTL - KIX
2 stops19h 35mUnited Airlines
Wed 9/244:50 pmKIX - STL
2 stops17h 56mUnited Airlines
Deal found 9/15$757
This United Airlines deal was found by Cheapflights users on 9/15. 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.
Tue 9/165:49 pmSTL - KIX
1 stop31h 01mUnited Airlines
Sun 9/218:25 amKIX - STL
2 stops29h 19mUnited Airlines
Deal found 9/15$760
This American Airlines deal was found by Cheapflights users on 9/16. 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 12/86:55 amSTL - KIX
1 stop20h 55mAmerican Airlines
Sat 12/205:50 pmKIX - STL
1 stop21h 01mAmerican Airlines
Deal found 9/16$767
This United Airlines deal was found by Cheapflights users on 9/15. 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.
Sat 9/204:32 pmSTL - KIX
2 stops32h 18mUnited Airlines
Sun 9/284:50 pmKIX - STL
2 stops19h 10mUnited Airlines
Deal found 9/15$769
This United Airlines deal was found by Cheapflights users on 9/15. 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.
Thu 9/185:49 pmSTL - KIX
1 stop31h 01mUnited Airlines
Tue 9/234:50 pmKIX - STL
1 stop38h 03mUnited Airlines
Deal found 9/15$783
This CheapOair deal was found by Cheapflights users on 9/14. 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.
Wed 11/121:43 pmSTL - ITM
2 stops39h 07mJapan Airlines
Thu 11/272:40 pmITM - STL
2 stops38h 03mJapan Airlines
Deal found 9/14$874
This Japan Airlines deal was found by Cheapflights users on 9/14. 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 Japan Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/207:23 amSTL - ITM
2 stops35h 12mJapan Airlines
Wed 9/247:25 amITM - STL
2 stops20h 06mJapan Airlines
Deal found 9/14$888
This Alaska Airlines deal was found by Cheapflights users on 9/15. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/166:00 amSTL - ITM
2 stops23h 45mAlaska Airlines
Thu 9/252:35 pmITM - STL
2 stops23h 24mAlaska Airlines
Deal found 9/15$902

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 September 17, 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 - ITM

STLITM

Lambert-St Louis

Sun 2/1

9:57 am-6:10 pm

2 stops41h 13m

Osaka Itami

Sat 2/7

1:00 pm-7:27 pm

2 stops45h 27m

$723

St. LouisOsaka

STL - ITM

STLITM

Lambert-St Louis

Sun 2/1

6:30 am-7:30 am

2 stops34h 00m

Osaka Itami

Sat 2/7

8:20 pm-10:52 am

2 stops29h 32m

$725

St. LouisOsaka

STL - ITM

STLITM

Lambert-St Louis

Sun 2/15

7:09 am-7:55 pm

2 stops21h 46m

Osaka Itami

Sat 2/28

2:40 pm-5:56 pm

2 stops18h 16m

$727

St. LouisOsaka

STL - KIX

STLKIX

Lambert-St Louis

Sat 9/27

5:11 pm-2:50 pm

2 stops31h 39m

Osaka Kansai Intl

Wed 10/1

4:50 pm-11:58 pm

2 stops21h 08m

$741

St. LouisOsaka

STL - KIX

STLKIX

Lambert-St Louis

Sun 2/1

6:00 am-6:50 pm

1 stop21h 50m

Osaka Kansai Intl

Sat 2/7

5:50 pm-11:59 pm

1 stop21h 09m

$863

St. LouisOsaka

STL - KIX

STLKIX

Lambert-St Louis

Fri 10/31

7:01 am-6:50 pm

2 stops21h 49m

Osaka Kansai Intl

Fri 11/7

5:50 pm-11:42 pm

1 stop20h 52m

$883

St. LouisOsaka

STL - KIX

STLKIX

Lambert-St Louis

Wed 10/15

4:50 pm-2:50 pm

2 stops32h 00m

Osaka Kansai Intl

Wed 10/22

8:30 am-10:00 pm

3 stops51h 30m

$1,059

St. LouisOsaka

STL - ITM

STLITM

Lambert-St Louis

Sun 10/26

4:05 pm-7:10 pm

2 stops37h 05m

Osaka Itami

Fri 10/31

2:30 pm-6:10 pm

3 stops41h 40m

$1,394

St. LouisOsaka

STL - ITM

STLITM

Lambert-St Louis

Wed 11/12

6:30 am-6:55 pm

3 stops21h 25m

Osaka Itami

Thu 11/27

1:00 pm-4:27 pm

2 stops18h 27m

$1,465

St. LouisOsaka

STL - ITM

STLITM

Lambert-St Louis

Wed 10/15

4:05 pm-7:10 pm

2 stops37h 05m

Osaka Itami

Wed 10/22

12:30 pm-10:02 am

3 stops35h 32m

$1,474

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/15

Showing 1-10 of 28 results
1
2
3

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

How much does it cost to fly round-trip from St. Louis to Osaka?

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 September 17, 2025.
Read through reviews of airlines operating flights from St. Louis to Osaka, such as ANA, Japan Airlines, and United Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
ANA
8.4
Very good
964 reviews

Entertainment

7.9

Boarding

8.6

Food

7.7

Comfort

8.2

Crew

8.7

Overall

8.4

Reviews

1 / 20
10.0
Excellent

Anonymous,Aug 2025

SFO - NRT

ANA ground and flight crew are the best their is They are now officially my Airline of choice Crew are very attentive, friendly, sincere, helpful and respond to queries accurately, promptly and gives you the peace of mind when travelling Salute to the World’s Best Airline for me
ANA
8.4
Very good
964 reviews
ANA
8.4
Very good
964 reviews

Entertainment

7.9

Boarding

8.6

Food

7.7

Comfort

8.2

Crew

8.7

Overall

8.4

Reviews

1 / 20
10.0
Excellent

Anonymous,Aug 2025

SFO - NRT

ANA ground and flight crew are the best their is They are now officially my Airline of choice Crew are very attentive, friendly, sincere, helpful and respond to queries accurately, promptly and gives you the peace of mind when travelling Salute to the World’s Best Airline for me
Japan Airlines
8.3
Very good
1,559 reviews
ANA
8.4
Very good
964 reviews

Entertainment

7.9

Boarding

8.6

Food

7.7

Comfort

8.2

Crew

8.7

Overall

8.4

Reviews

1 / 20
10.0
Excellent

Anonymous,Aug 2025

SFO - NRT

ANA ground and flight crew are the best their is They are now officially my Airline of choice Crew are very attentive, friendly, sincere, helpful and respond to queries accurately, promptly and gives you the peace of mind when travelling Salute to the World’s Best Airline for me
United Airlines
7.4
Good
8,924 reviews
ANA
8.4
Very good
964 reviews

Entertainment

7.9

Boarding

8.6

Food

7.7

Comfort

8.2

Crew

8.7

Overall

8.4

Reviews

1 / 20
10.0
Excellent

Anonymous,Aug 2025

SFO - NRT

ANA ground and flight crew are the best their is They are now officially my Airline of choice Crew are very attentive, friendly, sincere, helpful and respond to queries accurately, promptly and gives you the peace of mind when travelling Salute to the World’s Best Airline for me

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 0 different airlines.

  • How long is the flight from St. Louis to Osaka?

    For as low as $727, United Airlines can have you in Osaka from St. Louis in 21h 46m. Airlines will cover a distance of 6568 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

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

    $403 is the cheapest one-way deal found within the past few days, from Air Canada. You may also be able to find cheap deals on ANA and United Airlines, with prices starting from $408 and $429, 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 $859). Flying from St. Louis to Osaka in June is currently the most expensive (average of $1,309). 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 Osaka?

Book flights to Osaka if you plan to visit one of these locations
Nara
Nishinomiya

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

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 Itami flights
Kansas City to Kansai Intl flights

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.