Cheap Flights from St. Louis (STL) to Derby (DCN)

Popular airlines from St. Louis Lambert Intl. Airport (STL) to Derby, WA (DCN-RAAF Curtin)

    notification illustration

    Be in the know

    Get alerts if flight prices drop or rise*
    deals illustration

    Book smarter

    Save up to 30% on select hotels after you book a flight*
    trophy illustration

    Earn twice

    Earn your airline miles on top of our OneKeyCash
    Learn about One Key

Frequently asked questions

How much does a flight from Lambert-St. Louis Intl. Airport (STL) to Derby, WA (DCN-RAAF Curtin) cost?
Snag a cheap one-way flight or cheap return flight from Lambert-St. Louis Intl. Airport (STL) to Derby, WA (DCN-RAAF Curtin) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight deals on this route.
What is the cheapest month to fly from Lambert-St. Louis Intl. Airport (STL) to Derby, WA (DCN-RAAF Curtin)?
Flying in is a great way to save, as it's the cheapest month for flights between STL and DCN. You'll typically find the lowest fares during the off-season.
What is the cheapest airline that flies from Lambert-St. Louis Intl. Airport (STL) to Derby, WA (DCN-RAAF Curtin)?
Expedia's filter tool lets you easily compare different airlines, travel time and fares all in one place. Select your preferences, then sort by "Price (lowest to highest)" to see which carrier offers the cheapest STL to DCN flight.
How many flights per day from Lambert-St. Louis Intl. Airport (STL) to Derby, WA (DCN-RAAF Curtin)?
You'll need to catch a flight with a layover if you're traveling from Lambert-St. Louis Intl. Airport (STL) to Derby, WA (DCN-RAAF Curtin). 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 STL to DCN?
You'll typically 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 Lambert-St. Louis Intl. Airport (STL) to Derby, WA (DCN-RAAF Curtin)?
To touch down at Derby, WA (DCN-RAAF Curtin) on schedule, select a flight that leaves from Lambert-St. Louis Intl. Airport (STL) 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 Lambert-St. Louis Intl. Airport (STL) to Derby, WA (DCN-RAAF Curtin) last-minute?
Holding off until right before your break to book your flight from STL to DCN generally means paying more. While it's possible to find some last-minute discounts, they're not always guaranteed. Allow some flexibility in your schedule to boost your chances of snagging a bargain.
Is it cheaper to book a STL to DCN flight and hotel package?
Opting for a STL to DCN flight and hotel package is typically cheaper than booking separately. With Expedia, you can enjoy the convenience of organizing your trip all in one place. Select from our extensive range of hotels and then add car rentals, activities and flights 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 Lambert-St. Louis Intl. Airport (STL) to Derby, WA (DCN-RAAF Curtin)?
Generally, it's possible to reschedule or cancel your STL to DCN flight. However, for bookings made more than 24 hours ago, additional fees may apply. Check your airline's policies in your itinerary to see what changes are allowed and whether any costs are involved. You'll also find more details on our Customer Service portal.

Travel information

Travel information

Origin airport
Lambert-St. Louis Intl.
Destination airport
RAAF Curtin
Distance
9915 mi

Book with confidence

Book with confidence

St. Louis to Derby Flights

The cheapest times to fly from St. Louis to Derby

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

 

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

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

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 Derby in 2025. You can also book with separate airlines for your outbound and return journeys, from 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 Derby 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 Derby 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.

 

St. Louis to Derby Flights

Explore a world of travel with Expedia

Explore a world of travel with Expedia

*Available to One Key members.