$642 Cheap Flights from St. Louis (STL) to Kathmandu (KTM)

View $642 flight on Tue, Dec 2, 2025Opens in a new window

Popular airlines from St. Louis Lambert Intl. Airport (STL) to Tribhuvan Intl. Airport (KTM)

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Cheap Flights from St. Louis to Kathmandu (STL-KTM)

Prices were available within the past 7 days and start at $642 for one-way flights and $1,225 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Sat, Apr 18 - Tue, May 5
STL
St. Louis
KTM
Kathmandu
$1,225 Roundtrip, found 6 hours ago
$1,225
Roundtrip
found 6 hours ago
Select United flight, departing Sat, Apr 18 from St. Louis to Kathmandu, returning Tue, May 5, priced at $1,225 found 6 hours ago
United
Tue, Dec 2 - Tue, Mar 3
STL
St. Louis
KTM
Kathmandu
$1,228 Roundtrip, found 15 hours ago
$1,228
Roundtrip
found 15 hours ago
Select United flight, departing Tue, Dec 2 from St. Louis to Kathmandu, returning Tue, Mar 3, priced at $1,228 found 15 hours ago
United
Tue, Dec 2 - Tue, Mar 3
STL
St. Louis
KTM
Kathmandu
$1,233 Roundtrip, found 15 hours ago
$1,233
Roundtrip
found 15 hours ago
Select United flight, departing Tue, Dec 2 from St. Louis to Kathmandu, returning Tue, Mar 3, priced at $1,233 found 15 hours ago
United
Sat, Apr 18 - Tue, May 5
STL
St. Louis
KTM
Kathmandu
$1,276 Roundtrip, found 6 hours ago
$1,276
Roundtrip
found 6 hours ago
Select United flight, departing Sat, Apr 18 from St. Louis to Kathmandu, returning Tue, May 5, priced at $1,276 found 6 hours ago
United
Tue, Feb 3 - Tue, Mar 10
STL
St. Louis
KTM
Kathmandu
$1,286 Roundtrip, found 3 days ago
$1,286
Roundtrip
found 3 days ago
Select United flight, departing Tue, Feb 3 from St. Louis to Kathmandu, returning Tue, Mar 10, priced at $1,286 found 3 days ago
United
Tue, Nov 25 - Thu, Dec 25
STL
St. Louis
KTM
Kathmandu
$1,289 Roundtrip, found 1 day ago
$1,289
Roundtrip
found 1 day ago
Select United flight, departing Tue, Nov 25 from St. Louis to Kathmandu, returning Thu, Dec 25, priced at $1,289 found 1 day ago
Qatar Airways
Wed, Sep 3 - Tue, Sep 30
STL
St. Louis
KTM
Kathmandu
$1,343 Roundtrip, found 4 hours ago
$1,343
Roundtrip
found 4 hours ago
Select Qatar Airways flight, departing Wed, Sep 3 from St. Louis to Kathmandu, returning Tue, Sep 30, priced at $1,343 found 4 hours ago
American Airlines
Wed, Sep 3 - Tue, Sep 30
STL
St. Louis
KTM
Kathmandu
$1,401 Roundtrip, found 4 hours ago
$1,401
Roundtrip
found 4 hours ago
Select American Airlines flight, departing Wed, Sep 3 from St. Louis to Kathmandu, returning Tue, Sep 30, priced at $1,401 found 4 hours ago
Cathay Pacific
Fri, Aug 29 - Fri, Sep 5
STL
St. Louis
KTM
Kathmandu
$1,706 Roundtrip, found 13 hours ago
$1,706
Roundtrip
found 13 hours ago
Select Cathay Pacific flight, departing Fri, Aug 29 from St. Louis to Kathmandu, returning Fri, Sep 5, priced at $1,706 found 13 hours ago
Turkish Airlines
Tue, Sep 9 - Fri, Oct 10
STL
St. Louis
KTM
Kathmandu
$1,804 Roundtrip, found 6 days ago
$1,804
Roundtrip
found 6 days ago
Select Turkish Airlines flight, departing Tue, Sep 9 from St. Louis to Kathmandu, returning Fri, Oct 10, priced at $1,804 found 6 days ago

Alternative airports near Kathmandu

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Tribhuvan Intl. KTM. Cheapest and Closest option available. Average driving time to city center is 6 minutes. Flights from $1,670
KTM
Tribhuvan Intl.
CheapestClosest
Average driving time to city center6 min
Flights from $1,670
Flights from St. Louis (STL) to Kathmandu (KTM)
Origin airport
Lambert-St. Louis Intl.
Destination airport
Tribhuvan Intl.
Airlines serving
Cathay Pacific, Emirates, Korean Air, Qatar Airways, Turkish Airlines
Roundtrip price
$1,225
Distance
7837 mi

St. Louis to Kathmandu Flights

The cheapest times to fly from St. Louis to Kathmandu

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 Kathmandu are during the month of April. You can find some of the cheapest flights from St. Louis to Kathmandu with Expedia's search tool and vast selection of airlines.

 

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

Sunday is one of the best days to book for cheap flights from St. Louis to Kathmandu: 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 Kathmandu

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 Kathmandu in 2025. You can also book with separate airlines for your outbound and return journeys, from $642 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 Kathmandu 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 Kathmandu 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 Tribhuvan Intl. Airport (KTM) cost?
Discover the latest flight deals from STL to KTM by entering your preferred travel dates and searching on Expedia. Easily compare prices by departure date if you have flexibility with your schedule and use handy filters to explore prices for your preferred journey. As a member of One Key™, our free loyalty program, you can use Price Tracking to watch fares and receive notifications if prices go up or down.
What is the cheapest month to fly from STL to KTM?
The cheapest flights from STL to KTM are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
What is the cheapest airline that flies from STL to KTM?
Use the filter tool on Expedia to compare airlines and find the cheapest carrier that'll take you from STL to KTM. Sort your results by "Price (lowest to highest)" to snap up a great deal.
How many flights per day from Lambert-St. Louis Intl. Airport (STL) to Tribhuvan Intl. Airport (KTM)?
Nonstop flights from Lambert-St. Louis Intl. Airport (STL) to Tribhuvan Intl. Airport (KTM) aren't available daily, so you'll need to take a flight with a layover. Explore your options with our filter tool. Enter your dates and pick either "1 Stop" or "2+ Stops."
What day of the week has the most flights from STL to KTM?
You'll typically find Tuesday the quietest day for flights, while Fridays tend to be the busiest.* However this can change from season to season and during public holidays or peak travel times.*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 Tribhuvan Intl. Airport (KTM)?
To avoid potential delays on the Lambert-St. Louis Intl. Airport (STL) to Tribhuvan Intl. Airport (KTM) route, 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 Tribhuvan Intl. Airport (KTM) last-minute?
Last-minute bookings from STL to KTM are usually more expensive. To lock in the best prices, start looking for flights ahead of time. That said, if you're flexible with your travel plans, you may find a cheap fare just before your departure.
Is it cheaper to book a STL to KTM flight and hotel package?
Compared with arranging flights and hotels separately, booking a STL to KTM flight and hotel package with Expedia could result in significant savings. Better yet, having everything in one easy place takes the hassle out of planning your trip. Just pick your flights and select from our wide range of hotels, then personalize your trip with extras like tours, car rentals and activities.
Can I cancel or change the date of my flight from Lambert-St. Louis Intl. Airport (STL) to Tribhuvan Intl. Airport (KTM)?
If you booked your STL to KTM flight in the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of fare you have, additional charges may apply for changes after that time. Airline policies and contact information can be found in your itinerary or confirmation email. Or, go to our Customer Service portal for more details.

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*Available to One Key members.