$128 Cheap Flights from Redmond (RDM) to St. Louis (STL)

View $128 flight on Sat, Dec 6, 2025Opens in a new window

Popular airlines from Redmond Municipal Airport (RDM) to St. Louis Lambert Intl. Airport (STL)

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Cheap Flights from Redmond to St. Louis (RDM-STL)

Prices were available within the past 7 days and start at $128 for one-way flights and $254 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Tue, Jan 13 - Tue, Jan 27
RDM
Redmond
STL
St. Louis
$254 Roundtrip, found 6 days ago
$254
Roundtrip
found 6 days ago
Select Delta flight, departing Tue, Jan 13 from Redmond to St. Louis, returning Tue, Jan 27, priced at $254 found 6 days ago
Delta
Thu, Dec 25 - Fri, Jan 9
RDM
Redmond
STL
St. Louis
$274 Roundtrip, found 5 days ago
$274
Roundtrip
found 5 days ago
Select Delta flight, departing Thu, Dec 25 from Redmond to St. Louis, returning Fri, Jan 9, priced at $274 found 5 days ago
Delta
Sat, Jan 31 - Wed, Feb 18
RDM
Redmond
STL
St. Louis
$275 Roundtrip, found 6 days ago
$275
Roundtrip
found 6 days ago
Select Delta flight, departing Sat, Jan 31 from Redmond to St. Louis, returning Wed, Feb 18, priced at $275 found 6 days ago
Delta
Tue, Jan 13 - Sun, Jan 25
RDM
Redmond
STL
St. Louis
$285 Roundtrip, found 6 days ago
$285
Roundtrip
found 6 days ago
Select Delta flight, departing Tue, Jan 13 from Redmond to St. Louis, returning Sun, Jan 25, priced at $285 found 6 days ago
Delta
Tue, Feb 17 - Tue, Mar 3
RDM
Redmond
STL
St. Louis
$294 Roundtrip, found 2 days ago
$294
Roundtrip
found 2 days ago
Select Delta flight, departing Tue, Feb 17 from Redmond to St. Louis, returning Tue, Mar 3, priced at $294 found 2 days ago
Delta
Wed, Dec 3 - Sat, Dec 6
RDM
Redmond
STL
St. Louis
$294 Roundtrip, found 6 days ago
$294
Roundtrip
found 6 days ago
Select Delta flight, departing Wed, Dec 3 from Redmond to St. Louis, returning Sat, Dec 6, priced at $294 found 6 days ago
Hawaiian Airlines
Tue, Feb 24 - Sat, Mar 7
RDM
Redmond
STL
St. Louis
$302 Roundtrip, found 6 days ago
$302
Roundtrip
found 6 days ago
Select Hawaiian Airlines flight, departing Tue, Feb 24 from Redmond to St. Louis, returning Sat, Mar 7, priced at $302 found 6 days ago
Alaska Airlines
Wed, Dec 3 - Sat, Dec 6
RDM
Redmond
STL
St. Louis
$313 Roundtrip, found 6 days ago
$313
Roundtrip
found 6 days ago
Select Alaska Airlines flight, departing Wed, Dec 3 from Redmond to St. Louis, returning Sat, Dec 6, priced at $313 found 6 days ago
American Airlines
Wed, Dec 3 - Sat, Dec 6
RDM
Redmond
STL
St. Louis
$330 Roundtrip, found 6 days ago
$330
Roundtrip
found 6 days ago
Select American Airlines flight, departing Wed, Dec 3 from Redmond to St. Louis, returning Sat, Dec 6, priced at $330 found 6 days ago
United
Wed, Dec 3 - Sat, Dec 6
RDM
Redmond
STL
St. Louis
$331 Roundtrip, found 6 days ago
$331
Roundtrip
found 6 days ago
Select United flight, departing Wed, Dec 3 from Redmond to St. Louis, returning Sat, Dec 6, priced at $331 found 6 days ago

Find the cheapest month to fly from Redmond (RDM) to St. Louis (STL)

September is typically the cheapest month to fly

From $278 - $559 per traveler.

Frequently asked questions

How much does a flight from Robert's Field Airport (RDM) to Lambert-St. Louis Intl. Airport (STL) cost?
Grab a cheap one-way flight from $128 or cheap return flight from $254 from Robert's Field Airport (RDM) 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 Robert's Field Airport (RDM) to Lambert-St. Louis Intl. Airport (STL)?
Planning your trip for January can help you save, as it's the cheapest month for flights between RDM and STL. You'll often find the lowest fares during the off-season.
What is the cheapest airline that flies from Robert's Field Airport (RDM) 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. Tailor the search to your trip, then sort by "Price (lowest to highest)" to see which carrier offers the cheapest RDM to STL flight.
How many flights per day from Robert's Field Airport (RDM) to Lambert-St. Louis Intl. Airport (STL)?
Direct flights from Robert's Field Airport (RDM) 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 our filter tool. Enter your travel details and pick either "1 Stop" or "2+ Stops."
What day of the week has the most flights from RDM to STL?
Friday is typically the busiest day for flights, while Tuesday tends to be the quietest.* Just remember that flight schedules can change depending on various factors, such as the carrier and season.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Robert's Field Airport (RDM) to Lambert-St. Louis Intl. Airport (STL)?
Choose a flight from Robert's Field Airport (RDM) to Lambert-St. Louis Intl. Airport (STL) that takes off before 3 PM to reduce the risk of delays and cancellations. Departures later than this are on average 22% more likely to be canceled.**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 Robert's Field Airport (RDM) to Lambert-St. Louis Intl. Airport (STL) last-minute?
Last-minute bookings from RDM to STL are typically more expensive. To secure the best rates, start looking for flights ahead of time. That said, if you're flexible with your travel plans, it's possible to find a cheap ticket right before your journey.
Is it cheaper to book a RDM to STL flight and hotel package?
Securing a RDM to STL flight and hotel package tends to be cheaper than booking separately. With Expedia, you can enjoy the convenience of organizing your travels all in one place. Pick from our extensive range of hotels and then add flights, activities and car rentals 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 Robert's Field Airport (RDM) to Lambert-St. Louis Intl. Airport (STL)?
Typically, you can modify or cancel your RDM to STL flight. However, there may be additional charges, especially if you booked more than 24 hours ago. Check your itinerary for the airline's rules and fees on flight changes, or if you want further details, go to our Customer Service portal.

Travel information

Origin airport
Robert's Field
Destination airport
Lambert-St. Louis Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Hawaiian Airlines, United
Roundtrip price
$253
Distance
1627 mi

Book with confidence

Redmond to St. Louis Flights

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

 

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

Sunday is one of the best days to book for cheap flights from Redmond 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 Redmond 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 Redmond to St. Louis in 2025. You can also book with separate airlines for your outbound and return journeys, from $128 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 Redmond 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 Redmond 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.

 

Redmond to St. Louis Flights

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*Available to One Key members.