$667 Cheap Flights from St. Louis (STL) to Penang (PEN)

View $667 flight on Wed, Feb 11, 2026Opens in a new window

Popular airlines from St. Louis Lambert Intl. Airport (STL) to Penang Intl. Airport (PEN)

Cheap Flights from St. Louis to Penang (STL-PEN)

Prices were available within the past 7 days and start at $667 for one-way flights and $1,577 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Qatar Airways
Wed, Apr 1 - Wed, Apr 8
STL
St. Louis
PEN
Penang
$1,577 Roundtrip, found 3 days ago
$1,577
Roundtrip
found 3 days ago
Select Qatar Airways flight, departing Wed, Apr 1 from St. Louis to Penang, returning Wed, Apr 8, priced at $1,577 found 3 days ago
Cathay Pacific
Wed, Apr 1 - Wed, Apr 8
STL
St. Louis
PEN
Penang
$1,584 Roundtrip, found 3 days ago
$1,584
Roundtrip
found 3 days ago
Select Cathay Pacific flight, departing Wed, Apr 1 from St. Louis to Penang, returning Wed, Apr 8, priced at $1,584 found 3 days ago
Cathay Pacific
Wed, Apr 1 - Wed, Apr 8
STL
St. Louis
PEN
Penang
$1,602 Roundtrip, found 3 days ago
$1,602
Roundtrip
found 3 days ago
Select Cathay Pacific flight, departing Wed, Apr 1 from St. Louis to Penang, returning Wed, Apr 8, priced at $1,602 found 3 days ago
Qatar Airways
Wed, Apr 1 - Wed, Apr 8
STL
St. Louis
PEN
Penang
$1,637 Roundtrip, found 3 days ago
$1,637
Roundtrip
found 3 days ago
Select Qatar Airways flight, departing Wed, Apr 1 from St. Louis to Penang, returning Wed, Apr 8, priced at $1,637 found 3 days ago
Qatar Airways
Wed, Apr 1 - Wed, Apr 8
STL
St. Louis
PEN
Penang
$1,639 Roundtrip, found 3 days ago
$1,639
Roundtrip
found 3 days ago
Select Qatar Airways flight, departing Wed, Apr 1 from St. Louis to Penang, returning Wed, Apr 8, priced at $1,639 found 3 days ago
Qatar Airways
Wed, Apr 1 - Wed, Apr 8
STL
St. Louis
PEN
Penang
$1,644 Roundtrip, found 3 days ago
$1,644
Roundtrip
found 3 days ago
Select Qatar Airways flight, departing Wed, Apr 1 from St. Louis to Penang, returning Wed, Apr 8, priced at $1,644 found 3 days ago
Cathay Pacific
Wed, Apr 1 - Wed, Apr 8
STL
St. Louis
PEN
Penang
$1,658 Roundtrip, found 3 days ago
$1,658
Roundtrip
found 3 days ago
Select Cathay Pacific flight, departing Wed, Apr 1 from St. Louis to Penang, returning Wed, Apr 8, priced at $1,658 found 3 days ago
Qatar Airways
Wed, Apr 1 - Wed, Apr 8
STL
St. Louis
PEN
Penang
$1,667 Roundtrip, found 3 days ago
$1,667
Roundtrip
found 3 days ago
Select Qatar Airways flight, departing Wed, Apr 1 from St. Louis to Penang, returning Wed, Apr 8, priced at $1,667 found 3 days ago
Cathay Pacific
Wed, Apr 1 - Wed, Apr 8
STL
St. Louis
PEN
Penang
$1,676 Roundtrip, found 3 days ago
$1,676
Roundtrip
found 3 days ago
Select Cathay Pacific flight, departing Wed, Apr 1 from St. Louis to Penang, returning Wed, Apr 8, priced at $1,676 found 3 days ago
Lufthansa
Wed, Dec 17 - Thu, Jan 1
STL
St. Louis
PEN
Penang
$7,644 Roundtrip, found 2 days ago
$7,644
Roundtrip
found 2 days ago
Select Lufthansa flight, departing Wed, Dec 17 from St. Louis to Penang, returning Thu, Jan 1, priced at $7,644 found 2 days ago

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Flights from St. Louis (STL) to Penang (PEN)
Origin airport
Lambert-St. Louis Intl.
Destination airport
Penang Intl.
Roundtrip price
$1,576
Distance
9318 mi

St. Louis to Penang Flights

The cheapest times to fly from St. Louis to Penang

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from St. Louis to Penang are during the month of April. You can find some of the cheapest flights from St. Louis to Penang with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from St. Louis to Penang

Sunday is one of the best days to book for cheap flights from St. Louis to Penang: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from St. Louis to Penang

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from St. Louis to Penang in 2025. You can also book with separate airlines for your outbound and return journeys, from $667 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap St. Louis to Penang flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your St. Louis to Penang airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from Lambert-St. Louis Intl. Airport (STL) to Penang Intl. Airport (PEN) cost?
Snag a cheap one-way flight from $667 or cheap return flight from $1,577 from Lambert-St. Louis Intl. Airport (STL) to Penang Intl. Airport (PEN) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight deals on this route.
What is the cheapest month to fly from Lambert-St. Louis Intl. Airport (STL) to Penang Intl. Airport (PEN)?
The cheapest month to fly from STL to PEN is April, when there's less demand. Off-peak months are usually when you'll find cheap fares for travel between these airports.
What is the cheapest airline that flies from Lambert-St. Louis Intl. Airport (STL) to Penang Intl. Airport (PEN)?
To find the cheapest airline flying from STL to PEN, use Expedia's filter tool. Customize your search based on what matters most to you, such as preferred carriers and seat class. You can then sort your results by "Price (lowest to highest)" to discover the cheapest flight right away.
How many flights per day from Lambert-St. Louis Intl. Airport (STL) to Penang Intl. Airport (PEN)?
Nonstop flights from Lambert-St. Louis Intl. Airport (STL) to Penang Intl. Airport (PEN) aren't available daily, so you'll have to take a flight with a layover. Explore your options with Expedia's filters. Enter your dates and choose either "1 Stop" or "2+ Stops."
What day of the week has the most flights from STL to PEN?
You'll generally find Tuesday the quietest day for flights, while Fridays tend to be the busiest.* However this can vary from season to season and during peak travel times or public holidays.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Lambert-St. Louis Intl. Airport (STL) to Penang Intl. Airport (PEN)?
To avoid possible delays on the Lambert-St. Louis Intl. Airport (STL) to Penang Intl. Airport (PEN) route, aim to travel before 3 PM. Departures after this time have a 22% higher chance of cancellation.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Lambert-St. Louis Intl. Airport (STL) to Penang Intl. Airport (PEN) last-minute?
Waiting until right before your break to book a flight from STL to PEN generally means paying more. While you may come across some last-minute deals, they're not always guaranteed. Keep your travel plans flexible for a better chance of landing a bargain.
Is it cheaper to book a STL to PEN flight and hotel package?
Booking a STL to PEN flight and hotel package is generally cheaper than booking separately. With Expedia, you can enjoy the convenience of organizing your travels all in one place. Select from our wide range of accommodations and then add flights, car rentals and activities to your booking. Bundle it all together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Lambert-St. Louis Intl. Airport (STL) to Penang Intl. Airport (PEN)?
It's generally possible to cancel or reschedule your STL to PEN flight. However, if it's been more than 24 hours since booking, additional fees may apply. Check your airline's policies in your itinerary to see what changes are allowed and whether any costs are involved. You'll also find further details on our Customer Service portal.

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*Available to One Key members.