$122 Cheap Flights from Eugene (EUG) to St. Louis (STL)

View $122 flight on Wed, Dec 31, 2025Opens in a new window

Popular airlines from Mahlon Sweet Field Airport (EUG) to St. Louis Lambert Intl. Airport (STL)

Cheap Flights from Eugene to St. Louis (EUG-STL)

Prices were available within the past 7 days and start at $122 for one-way flights and $212 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Southwest Airlines
Tue, Oct 7 - Tue, Oct 21
EUG
Eugene
STL
St. Louis
$212 Roundtrip, found 4 days ago
$212
Roundtrip
found 4 days ago
Select Southwest Airlines flight, departing Tue, Oct 7 from Eugene to St. Louis, returning Tue, Oct 21, priced at $212 found 4 days ago
Southwest Airlines
Tue, Oct 7 - Tue, Oct 21
EUG
Eugene
STL
St. Louis
$217 Roundtrip, found 4 days ago
$217
Roundtrip
found 4 days ago
Select Southwest Airlines flight, departing Tue, Oct 7 from Eugene to St. Louis, returning Tue, Oct 21, priced at $217 found 4 days ago
American Airlines
Thu, Oct 23 - Wed, Oct 29
EUG
Eugene
STL
St. Louis
$222 Roundtrip, found 3 days ago
$222
Roundtrip
found 3 days ago
Select American Airlines flight, departing Thu, Oct 23 from Eugene to St. Louis, returning Wed, Oct 29, priced at $222 found 3 days ago
Southwest Airlines
Tue, Oct 7 - Tue, Oct 21
EUG
Eugene
STL
St. Louis
$233 Roundtrip, found 4 days ago
$233
Roundtrip
found 4 days ago
Select Southwest Airlines flight, departing Tue, Oct 7 from Eugene to St. Louis, returning Tue, Oct 21, priced at $233 found 4 days ago
Alaska Airlines
Tue, Oct 7 - Tue, Oct 21
EUG
Eugene
STL
St. Louis
$236 Roundtrip, found 4 days ago
$236
Roundtrip
found 4 days ago
Select Alaska Airlines flight, departing Tue, Oct 7 from Eugene to St. Louis, returning Tue, Oct 21, priced at $236 found 4 days ago
Southwest Airlines
Tue, Oct 7 - Tue, Oct 21
EUG
Eugene
STL
St. Louis
$238 Roundtrip, found 4 days ago
$238
Roundtrip
found 4 days ago
Select Southwest Airlines flight, departing Tue, Oct 7 from Eugene to St. Louis, returning Tue, Oct 21, priced at $238 found 4 days ago
American Airlines
Thu, Oct 23 - Wed, Oct 29
EUG
Eugene
STL
St. Louis
$243 Roundtrip, found 3 days ago
$243
Roundtrip
found 3 days ago
Select American Airlines flight, departing Thu, Oct 23 from Eugene to St. Louis, returning Wed, Oct 29, priced at $243 found 3 days ago
Alaska Airlines
Thu, Oct 23 - Wed, Oct 29
EUG
Eugene
STL
St. Louis
$244 Roundtrip, found 3 days ago
$244
Roundtrip
found 3 days ago
Select Alaska Airlines flight, departing Thu, Oct 23 from Eugene to St. Louis, returning Wed, Oct 29, priced at $244 found 3 days ago
Delta
Wed, Nov 19 - Tue, Dec 2
EUG
Eugene
STL
St. Louis
$248 Roundtrip, found 4 days ago
$248
Roundtrip
found 4 days ago
Select Delta flight, departing Wed, Nov 19 from Eugene to St. Louis, returning Tue, Dec 2, priced at $248 found 4 days ago
United
Tue, Oct 7 - Tue, Oct 21
EUG
Eugene
STL
St. Louis
$263 Roundtrip, found 4 days ago
$263
Roundtrip
found 4 days ago
Select United flight, departing Tue, Oct 7 from Eugene to St. Louis, returning Tue, Oct 21, priced at $263 found 4 days ago

Find the cheapest month to fly from Eugene (EUG) to St. Louis (STL)

September is typically the cheapest month to fly

From $222 - $824 per traveler.

Frequently asked questions

How much does a flight from Mahlon Sweet Field Airport (EUG) to Lambert-St. Louis Intl. Airport (STL) cost?
Secure a cheap one-way flight from $122 or cheap return flight from $212 from Mahlon Sweet Field Airport (EUG) to Lambert-St. Louis Intl. Airport (STL) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight offers on this route.
What is the cheapest month to fly from Mahlon Sweet Field Airport (EUG) to Lambert-St. Louis Intl. Airport (STL)?
Planning your getaway for October is a great way to save, as it's the cheapest month for flights between EUG and STL. You'll usually find the lowest prices during off-peak months.
What is the cheapest airline that flies from Mahlon Sweet Field Airport (EUG) to Lambert-St. Louis Intl. Airport (STL)?
Expedia's filter tool lets you easily compare airlines, flight times and baggage options all in one place. Choose your preferences, then sort by "Price (lowest to highest)" to find out which carrier offers the cheapest EUG to STL flight.
How many flights per day from Mahlon Sweet Field Airport (EUG) to Lambert-St. Louis Intl. Airport (STL)?
You'll need to book a flight with a layover if you're traveling from Mahlon Sweet Field Airport (EUG) to Lambert-St. Louis Intl. Airport (STL). Direct flights don't operate daily on this route. However, just filter your search to include one or two stops to find an option that works for you.
What day of the week has the most flights from EUG to STL?
You'll generally find Tuesday the quietest day for flights, while Fridays are often 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 Mahlon Sweet Field Airport (EUG) to Lambert-St. Louis Intl. Airport (STL)?
To touch down at Lambert-St. Louis Intl. Airport (STL) without delays, choose a flight that leaves Mahlon Sweet Field Airport (EUG) before 3 PM. The likelihood 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 Mahlon Sweet Field Airport (EUG) to Lambert-St. Louis Intl. Airport (STL) last-minute?
Booking your plane ticket from EUG to STL just before your trip is typically more expensive. However, if you're flexible with your travel times and dates, you could grab a cheap last-minute fare.
Is it cheaper to book an EUG to STL flight and hotel package?
Booking an EUG to STL flight and hotel package is usually cheaper than booking separately. With Expedia, you can enjoy the convenience of organizing your travels all in one place. Pick from our impressive range of hotels and then add activities, flights and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Mahlon Sweet Field Airport (EUG) to Lambert-St. Louis Intl. Airport (STL)?
Typically, you can reschedule or cancel your EUG to STL flight. However, additional charges may apply, especially if your booking was made more than 24 hours ago. Check your itinerary for the airline's fees and guidelines on flight changes, or if you'd like further details, head to our Customer Service portal.

Travel information

Travel information

Origin airport
Eugene
Destination airport
Lambert-St. Louis Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Hawaiian Airlines, Southwest Airlines, United
Roundtrip price
$212
Distance
1729 mi

Book with confidence

Book with confidence

Eugene to St. Louis Flights

The cheapest times to fly from Eugene 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 Eugene to St. Louis are during the month of October. You can find some of the cheapest flights from Eugene to St. Louis with Expedia's search tool and vast selection of airlines.

 

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

Sunday is one of the best days to book for cheap flights from Eugene 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 Eugene 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 Eugene to St. Louis in 2025. You can also book with separate airlines for your outbound and return journeys, from $122 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 Eugene 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 Eugene 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.

 

Eugene to St. Louis Flights

Explore a world of travel with Expedia

Explore a world of travel with Expedia

*Available to One Key members.