$432 Cheap Flights from Quito (UIO) to St. Louis (STL)

View $432 flight on Tue, Feb 17, 2026Opens in a new window

Popular airlines from Mariscal Sucre Intl. Airport (UIO) to St. Louis Lambert Intl. Airport (STL)

Cheap Flights from Quito to St. Louis (UIO-STL)

Prices were available within the past 7 days and start at $432 for one-way flights and $693 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Wed, Dec 3 - Wed, Dec 10
UIO
Quito
STL
St. Louis
$693 Roundtrip, found 5 days ago
$693
Roundtrip
found 5 days ago
Select United flight, departing Wed, Dec 3 from Quito to St. Louis, returning Wed, Dec 10, priced at $693 found 5 days ago
United
Mon, Dec 22 - Fri, Jan 23
UIO
Quito
STL
St. Louis
$705 Roundtrip, found 1 day ago
$705
Roundtrip
found 1 day ago
Select United flight, departing Mon, Dec 22 from Quito to St. Louis, returning Fri, Jan 23, priced at $705 found 1 day ago
United
Mon, Dec 22 - Fri, Jan 23
UIO
Quito
STL
St. Louis
$709 Roundtrip, found 1 day ago
$709
Roundtrip
found 1 day ago
Select United flight, departing Mon, Dec 22 from Quito to St. Louis, returning Fri, Jan 23, priced at $709 found 1 day ago
United
Tue, Dec 2 - Tue, Dec 9
UIO
Quito
STL
St. Louis
$711 Roundtrip, found 5 days ago
$711
Roundtrip
found 5 days ago
Select United flight, departing Tue, Dec 2 from Quito to St. Louis, returning Tue, Dec 9, priced at $711 found 5 days ago
United
Fri, Nov 21 - Sat, Dec 6
UIO
Quito
STL
St. Louis
$717 Roundtrip, found 5 days ago
$717
Roundtrip
found 5 days ago
Select United flight, departing Fri, Nov 21 from Quito to St. Louis, returning Sat, Dec 6, priced at $717 found 5 days ago
United
Tue, Dec 23 - Sat, Jan 10
UIO
Quito
STL
St. Louis
$723 Roundtrip, found 5 days ago
$723
Roundtrip
found 5 days ago
Select United flight, departing Tue, Dec 23 from Quito to St. Louis, returning Sat, Jan 10, priced at $723 found 5 days ago
Delta
Sat, Dec 13 - Thu, Jan 1
UIO
Quito
STL
St. Louis
$765 Roundtrip, found 5 days ago
$765
Roundtrip
found 5 days ago
Select Delta flight, departing Sat, Dec 13 from Quito to St. Louis, returning Thu, Jan 1, priced at $765 found 5 days ago
LATAM Airlines Group
Tue, May 26 - Sun, Jun 7
UIO
Quito
STL
St. Louis
$788 Roundtrip, found 3 days ago
$788
Roundtrip
found 3 days ago
Select LATAM Airlines Group flight, departing Tue, May 26 from Quito to St. Louis, returning Sun, Jun 7, priced at $788 found 3 days ago
American Airlines
Sat, Nov 8 - Sat, Nov 15
UIO
Quito
STL
St. Louis
$1,013 Roundtrip, found 3 days ago
$1,013
Roundtrip
found 3 days ago
Select American Airlines flight, departing Sat, Nov 8 from Quito to St. Louis, returning Sat, Nov 15, priced at $1,013 found 3 days ago
Air Canada
Mon, Dec 22 - Mon, Dec 29
UIO
Quito
STL
St. Louis
$1,577 Roundtrip, found 4 days ago
$1,577
Roundtrip
found 4 days ago
Select Air Canada flight, departing Mon, Dec 22 from Quito to St. Louis, returning Mon, Dec 29, priced at $1,577 found 4 days ago

Frequently asked questions

How much does a flight from Mariscal Sucre Intl. Airport (UIO) to Lambert-St. Louis Intl. Airport (STL) cost?
Grab a cheap one-way flight from $432 or cheap return flight from $693 from Mariscal Sucre Intl. Airport (UIO) to Lambert-St. Louis Intl. Airport (STL) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight offers on this route.
What is the cheapest month to fly from Mariscal Sucre Intl. Airport (UIO) to Lambert-St. Louis Intl. Airport (STL)?
The cheapest month to fly from UIO to STL is December, when demand is low. Off-peak months are typically when you'll find lower airfares between these airports.
What is the cheapest airline that flies from Mariscal Sucre Intl. Airport (UIO) to Lambert-St. Louis Intl. Airport (STL)?
Use the filters on Expedia to compare airlines and find the most affordable carrier that'll fly you from UIO to STL. Then, sort your results by "Price (lowest to highest)" to snag a good deal.
How many flights per day from Mariscal Sucre Intl. Airport (UIO) to Lambert-St. Louis Intl. Airport (STL)?
Direct flights from Mariscal Sucre Intl. Airport (UIO) to Lambert-St. Louis Intl. Airport (STL) aren't available daily, so you'll need to take a flight with a layover. Explore your options with Expedia's filters. Enter your travel details and select either "1 Stop" or "2+ Stops."
What day of the week has the most flights from UIO to STL?
You'll generally find Tuesday the quietest day for flights, while Fridays are often the busiest.* However this can vary 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 Mariscal Sucre Intl. Airport (UIO) to Lambert-St. Louis Intl. Airport (STL)?
To land at Lambert-St. Louis Intl. Airport (STL) on schedule, choose a flight that takes off from Mariscal Sucre Intl. Airport (UIO) before 3 PM. The chance of cancellations is 22% higher, on average, for departures after this time.**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 Mariscal Sucre Intl. Airport (UIO) to Lambert-St. Louis Intl. Airport (STL) last-minute?
Last-minute bookings from UIO to STL are generally more expensive. To lock in the best prices, start searching for flights early. That said, if your travel plans are flexible, it's possible to score a cheap ticket just before your departure.
Is it cheaper to book an UIO to STL flight and hotel package?
Compared with arranging hotels and flights separately, booking an UIO to STL flight and hotel package with Expedia could lead to significant savings. Better still, managing everything in one place will take the hassle out of planning your trip. Just secure your flights and select from our wide range of stays, then personalize your trip with other add-ons like tours, car rentals and activities.
Can I cancel or change the date of my flight from Mariscal Sucre Intl. Airport (UIO) to Lambert-St. Louis Intl. Airport (STL)?
Typically, you can cancel or modify your UIO to STL flight. However, there may be additional fees, especially if you made your booking more than 24 hours ago. Double-check your itinerary for the airline's guidelines and fees on flight changes, or if you need further information, head to our Customer Service portal.

Travel information

Origin airport
Mariscal Sucre Intl.
Destination airport
Lambert-St. Louis Intl.
Airlines serving
Air Canada, American Airlines, Delta, LATAM Airlines Group, United
Roundtrip price
$692
Distance
2791 mi

Book with confidence

Quito to St. Louis Flights

The cheapest times to fly from Quito to St. Louis

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

 

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

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

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 Quito to St. Louis in 2025. You can also book with separate airlines for your outbound and return journeys, from $432 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 Quito to St. Louis 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 Quito to St. Louis 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.

 

Quito to St. Louis Flights

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*Available to One Key members.