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Hanoi

$521+ Cheap flights from St. Louis (STL) to Hanoi (HAN)

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 12/31. Fares are subject to change and may not be available on all flights or dates of travel.
STL — HAN
Oct 17 — Oct 241
Fri 10/17
Fri 10/24
1 adult, Economy
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Cheap flight deals from St. Louis to Hanoi

Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Hanoi (HAN). 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

$1,086
(oojo)

One-way from

$521
(American Airlines)

Popular in

December

Cheapest in

September

Average price

$996
From Lambert-St Louis to Hanoi Noibai
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One-way flight from Lambert-St Louis to Hanoi Noibai
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Highest demand for flights based on searches. 8% potential increase in price ($128 potential increase over avg. RT price).
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Cheapest flight prices on average. 6% potential price decrease ($89 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Find flight deals from St. Louis to Hanoi

Cheapest flights from St. Louis to Hanoi
Explore the most affordable flight options available from St. Louis to Hanoi. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 17, 2025.

This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/241:26 pmSTL - HAN
2 stops33h 14mDelta
Sun 9/2811:10 pmHAN - STL
2 stops37h 28mDelta
Deal found 9/14$996
This oojo 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/173:57 pmSTL - HAN
2 stops30h 28mMultiple Airlines
Fri 11/711:30 amHAN - STL
2 stops25h 29mMultiple Airlines
Deal found 9/15$1,086
This lastminute.com 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 lastminute.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/316:00 amSTL - HAN
2 stops27h 45mKorean Air
Fri 11/712:20 pmHAN - STL
2 stops23h 47mKorean Air
Deal found 9/16$1,133
This oojo 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/36:20 amSTL - HAN
2 stops45h 15mCathay Pacific
Thu 10/2310:55 amHAN - STL
2 stops44h 14mCathay Pacific
Deal found 9/16$1,136
This Trip.com 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/317:00 amSTL - HAN
2 stops42h 10mMultiple Airlines
Thu 11/612:25 amHAN - STL
2 stops36h 34mMultiple Airlines
Deal found 9/16$1,173
This Orbitz 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/36:30 pmSTL - HAN
2 stops42h 15mMultiple Airlines
Wed 10/2212:40 amHAN - STL
2 stops49h 47mMultiple Airlines
Deal found 9/16$1,273
This oojo 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/176:08 pmSTL - HAN
2 stops49h 07mQatar Airways
Thu 11/63:00 amHAN - STL
2 stops33h 56mQatar Airways
Deal found 9/15$1,364
This United 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/36:15 amSTL - HAN
2 stops28h 00mUnited Airlines
Thu 10/2311:35 pmHAN - STL
3 stops34h 25mUnited Airlines
Deal found 9/16$1,419
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.
Wed 9/246:00 amSTL - HAN
2 stops28h 15mUnited Airlines
Sun 9/2811:35 pmHAN - STL
3 stops34h 25mUnited Airlines
Deal found 9/15$1,578

Cheapflights Fare Finder

 
Customize your flight search to find flights from St. Louis to Hanoi 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 Hanoi that are best for you.

Fly from

St. Louis

Fly to

Hanoi

Route

Depart

Return

Price

St. LouisHanoi

STL - HAN

STLHAN

Lambert-St Louis

Fri 10/31

6:00 am-9:45 pm

2 stops27h 45m

Hanoi Noibai

Fri 11/7

12:20 pm-11:07 pm

2 stops23h 47m

$1,133

St. LouisHanoi

STL - HAN

STLHAN

Lambert-St Louis

Fri 10/31

7:00 am-1:10 pm

2 stops42h 10m

Hanoi Noibai

Thu 11/6

12:25 am-11:59 pm

2 stops36h 34m

$1,173

St. LouisHanoi

STL - HAN

STLHAN

Lambert-St Louis

Fri 3/6

5:18 pm-11:05 pm

2 stops40h 47m

Hanoi Noibai

Thu 3/19

12:25 am-9:48 am

2 stops45h 23m

$1,232

St. LouisHanoi

STL - HAN

STLHAN

Lambert-St Louis

Thu 3/5

7:00 am-5:15 pm

2 stops45h 15m

Hanoi Noibai

Fri 3/20

12:35 pm-11:55 pm

2 stops47h 20m

$1,250

St. LouisHanoi

STL - HAN

STLHAN

Lambert-St Louis

Thu 3/5

9:25 am-12:20 pm

2 stops37h 55m

Hanoi Noibai

Thu 3/19

1:45 am-10:24 pm

2 stops32h 39m

$1,265

St. LouisHanoi

STL - HAN

STLHAN

Lambert-St Louis

Thu 3/5

6:45 am-9:45 pm

2 stops26h 00m

Hanoi Noibai

Sat 3/21

11:05 pm-12:37 am

2 stops37h 32m

$1,282

St. LouisHanoi

STL - HAN

STLHAN

Lambert-St Louis

Fri 3/6

7:30 am-9:45 pm

2 stops25h 15m

Hanoi Noibai

Sat 3/21

11:05 pm-12:37 am

2 stops37h 32m

$1,330

St. LouisHanoi

STL - HAN

STLHAN

Lambert-St Louis

Fri 10/17

6:08 pm-7:15 am

2 stops49h 07m

Hanoi Noibai

Thu 11/6

3:00 am-11:56 pm

2 stops33h 56m

$1,364

St. LouisHanoi

STL - HAN

STLHAN

Lambert-St Louis

Fri 10/3

6:15 am-10:15 pm

2 stops28h 00m

Hanoi Noibai

Thu 10/23

11:35 pm-10:00 pm

3 stops34h 25m

$1,419

St. LouisHanoi

STL - HAN

STLHAN

Lambert-St Louis

Wed 12/31

5:17 am-10:30 pm

2 stops28h 13m

$521

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/16

Showing 1-10 of 11 results
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Best time to book a flight from St. Louis to Hanoi

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

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

Find hourly flight availability from St. Louis to Hanoi. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 17, 2025.

It’s optimal to fly from St. Louis to Hanoi at noon. By choosing this option you can save up to 36% on the cost of your flight, compared to a flight in the morning.

Reviews of airlines servicing Hanoi

Get insights into the airlines that provide service to Hanoi. 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 Hanoi. Reviews last updated September 17, 2025.
Get a feel of what it's like to fly with Delta from St. Louis to Hanoi by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,961 reviews

Boarding

8.2

Overall

8.0

Comfort

7.9

Crew

8.5

Entertainment

7.9

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Delta
8.0
Very good
7,961 reviews
Delta
8.0
Very good
7,961 reviews

Boarding

8.2

Overall

8.0

Comfort

7.9

Crew

8.5

Entertainment

7.9

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Related info for your journey

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

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

    A quick flight from St. Louis to Hanoi can take about 27h 45m. Korean Air provides one of the quickest options available for as low as $1,133. The distance between St. Louis and Hanoi is about 8157 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • What is the cheapest airline to fly from St. Louis to Hanoi round-trip?

    Currently priced at $920, Delta will fly you from St. Louis to Hanoi and back. In addition to Delta, many other airlines offer competitively priced options for your trip. Users have found that Delta is 34% cheaper than the other options available to this destination.

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

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

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

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

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

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

    Currently, September is the cheapest month in which you can book a flight from St. Louis to Hanoi (average of $862). Flying from St. Louis to Hanoi in December is currently the most expensive (average of $1,597). 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

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.

Top airline flying from St. Louis to Hanoi

Discover the top airline that operate flights from St. Louis to Hanoi. 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 September 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$920Average$1,357FlexibilityNo cancel feeOn-timeN/A

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