$153 Cheap Flights from Redmond (RDM) to St. Louis (STL)

View $153 flight on Mon, Jun 9, 2025Opens in a new window

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Find available prices by choosing your travel dates.

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

Prices were available within the past 7 days and start at $153 for one-way flights and $286 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Wed, Jun 11 - Tue, Jun 17
RDM
Redmond
STL
St. Louis
$286 Roundtrip, found 14 hours ago
$286
Roundtrip
found 14 hours ago
Select Delta flight, departing Wed, Jun 11 from Redmond to St. Louis, returning Tue, Jun 17, priced at $286 found 14 hours ago
Delta
Mon, Jun 2 - Tue, Jun 3
RDM
Redmond
STL
St. Louis
$290 Roundtrip, found 6 days ago
$290
Roundtrip
found 6 days ago
Select Delta flight, departing Mon, Jun 2 from Redmond to St. Louis, returning Tue, Jun 3, priced at $290 found 6 days ago
Delta
Wed, Jun 11 - Mon, Jun 16
RDM
Redmond
STL
St. Louis
$296 Roundtrip, found 14 hours ago
$296
Roundtrip
found 14 hours ago
Select Delta flight, departing Wed, Jun 11 from Redmond to St. Louis, returning Mon, Jun 16, priced at $296 found 14 hours ago
Delta
Mon, Jun 9 - Mon, Jun 16
RDM
Redmond
STL
St. Louis
$306 Roundtrip, found 14 hours ago
$306
Roundtrip
found 14 hours ago
Select Delta flight, departing Mon, Jun 9 from Redmond to St. Louis, returning Mon, Jun 16, priced at $306 found 14 hours ago
Delta
Sat, May 31 - Tue, Jun 3
RDM
Redmond
STL
St. Louis
$306 Roundtrip, found 6 days ago
$306
Roundtrip
found 6 days ago
Select Delta flight, departing Sat, May 31 from Redmond to St. Louis, returning Tue, Jun 3, priced at $306 found 6 days ago
Delta
Sat, May 17 - Sat, May 31
RDM
Redmond
STL
St. Louis
$310 Roundtrip, found 1 day ago
$310
Roundtrip
found 1 day ago
Select Delta flight, departing Sat, May 17 from Redmond to St. Louis, returning Sat, May 31, priced at $310 found 1 day ago
United
Sat, May 31 - Tue, Jun 3
RDM
Redmond
STL
St. Louis
$327 Roundtrip, found 6 days ago
$327
Roundtrip
found 6 days ago
Select United flight, departing Sat, May 31 from Redmond to St. Louis, returning Tue, Jun 3, priced at $327 found 6 days ago
Alaska Airlines
Tue, Jun 10 - Tue, Jun 17
RDM
Redmond
STL
St. Louis
$336 Roundtrip, found 4 days ago
$336
Roundtrip
found 4 days ago
Select Alaska Airlines flight, departing Tue, Jun 10 from Redmond to St. Louis, returning Tue, Jun 17, priced at $336 found 4 days ago
Hawaiian Airlines
Sat, May 24 - Mon, Jun 9
RDM
Redmond
STL
St. Louis
$336 Roundtrip, found 1 day ago
$336
Roundtrip
found 1 day ago
Select Hawaiian Airlines flight, departing Sat, May 24 from Redmond to St. Louis, returning Mon, Jun 9, priced at $336 found 1 day ago
American Airlines
Fri, Jun 6 - Tue, Jun 10
RDM
Redmond
STL
St. Louis
$337 Roundtrip, found 6 days ago
$337
Roundtrip
found 6 days ago
Select American Airlines flight, departing Fri, Jun 6 from Redmond to St. Louis, returning Tue, Jun 10, priced at $337 found 6 days ago
Flights from Redmond (RDM) to St. Louis (STL)
Origin airport
Robert's Field
Destination airport
Lambert-St. Louis Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Hawaiian Airlines, United
Roundtrip price
$285
Distance
1627 mi

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 June. 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 $153 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.

Frequently asked questions

How much does a flight from Robert's Field Airport (RDM) to Lambert-St. Louis Intl. Airport (STL) cost?
Discover the latest flight deals from RDM to STL 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 RDM to STL?
The cheapest flights from RDM to STL 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 RDM to STL?
Use the filter tool on Expedia to compare airlines and find the cheapest carrier that’ll take you from RDM to STL. Sort your results by “Price (lowest to highest)” to snap up a great deal.
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.

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*Available to One Key members.