$43 Cheap Flights to Dupo, IL

Flights to Dupo at a glance

Getting to Dupo is easy—select from a range of full-service or budget airlines, compare travel times, and choose the option that best matches your budget, itinerary, and plans to discover the city's well-known attractions and neighborhoods.

• Major airport near Dupo: Lambert-St. Louis International Airport (STL)
• Flights per week: 3,150+ flights arriving at Dupo airport
• Number of airlines that fly to Dupo: around 40+ carriers

Popular airport near Dupo

Dupo is a charming city ideal for outdoor adventures, family getaways, and urban explorations. Visitors are drawn to its rich culture, sports activities, and vibrant city life. A major airport conveniently serves Dupo, making it accessible for travelers.

• Lambert-St. Louis International Airport (STL): Situated in St. Louis County, Missouri, approximately 18 miles from Dupo, this airport provides a gateway for both domestic and international air travel, linking to around 210 domestic cities and 110 international destinations. Travelers can enjoy options to enhance their journey by upgrading to first class, premium economy class, or business class seating, depending on the airlines and routes available. Notable airlines operating here include Southwest Airlines, American Airlines, and Delta.

Top routes to Dupo

• New York (JFK/LGA) to Dupo (STL), with one-way flights starting at around $90
• Las Vegas (LAS) to Dupo (STL), with one-way flights starting at around $60
• Orlando (MCO) to Dupo (STL), with one-way tickets available from around $45
• Denver (DEN) to Dupo (STL), with one-way tickets available from around $45
• Los Angeles (LAX) to Dupo (STL), with one-way fares starting at around $120

Cheapest routes to Dupo

• Chicago (ORD/MDW) to Dupo (STL), with low one-way fares from around $40
• Kansas City (MCI) to Dupo (STL), with budget one-way fares from around $40
• Quincy (UIN) to Dupo (STL), with low-cost one-way tickets from around $40
• Orlando (MCO) to Dupo (STL), with low-cost one-way tickets from around $45
• Denver (DEN) to Dupo (STL), with budget one-way fares from around $45

*Flight times and fares vary by season and availability and are based on one-way routes

Top airlines with flights to Dupo

• American Airlines: Provides service to Lambert-St. Louis International Airport (STL), representing roughly 28% of Dupo's incoming flights. The average fare for a one-way ticket is around $330, with options for first class depending on the route.
• Southwest Airlines: Also operating flights to Lambert-St. Louis International Airport (STL), Southwest makes up about 27% of arrivals into Dupo. Travelers can expect an average one-way fare of around $240.
• Delta: Servicing Lambert-St. Louis International Airport (STL), Delta accounts for approximately 20% of Dupo's flight arrivals. Average one-way fares hover around $290, with premium seating options that may include both premium economy and first class, based on the route.
• United: With flights to Lambert-St. Louis International Airport (STL), United represents about 15% of arrivals in Dupo. One-way fares average roughly $320, offering first-class service depending on specific routes.
• Frontier Airlines: Operating to Lambert-St. Louis International Airport (STL), Frontier contributes around 5% of Dupo's flight traffic. This budget-friendly airline features average one-way fares of approximately $150.

Best time to fly to Dupo

The most popular months for travelers to fly to Dupo are January, March, and April, when peak temperatures in Dupo can reach up to 56.1°F in April. If you prefer quieter travel, consider September, the least busy time to visit with temperatures around 70.7°F and typically the lowest average one-way fare (around $222), roughly 9% cheaper than the yearly average. Looking for additional cheaper months to fly? October, May, and August offer average one-way fares of around $230, making them good options for flexible travelers.

*Average one-way fare is based on Expedia flight booking data from January 2025 to April 2026 for the specified route and travel class and may change depending on availability, dates, and demand.

How to save money on a flight to Dupo

Getting some of the best deals on flights to Dupo is all about timing and flexibility. Here are some key tips to help you save:

1. Compare flight options—use Expedia's search tool to compare airlines, routes, direct vs. non-direct flights, and flight times. You can also sort by price to find the most affordable options.
2. Set up price alerts—as an Expedia member you can use Price Tracking to receive notifications when flight prices change.
3. Bundle and save—book a flight and unlock a hotel deal on Expedia*, or explore our Dupo hotel and flight deals.
4. Think about luggage-nowadays, it's important to check the airline's baggage policies to find the best value. That may be paying for an additional carry-on bag or booking a ticket with checked luggage included. Either way, double-check your baggage allowance before confirming your booking to avoid excess baggage fees at the airport.
5. Earn miles—you can earn airline miles when you book your Dupo flight with Expedia. Just select your frequent flyer program and enter your program number when confirming your booking.

*For members. Select hotels.

Arriving in Dupo

Dupo welcomes travelers through its range of transport options based on price, convenience, and proximity. Here's how to reach Dupo efficiently:

• Public transportation: From Lambert-St. Louis International Airport, Lambert Main Terminal Station, a metro station, is located just 0.1 miles from the airport, providing easy access to public transportation.
• Hotel transfer: Transfers offer a convenient way to reach your hotel in Dupo, with private rides that can be arranged in advance.
• Car rental: Renting a car in Dupo is a good option if you plan to explore and sightsee beyond the city. Browse cheap car rentals in Dupo on Expedia.
• Taxi/ride-hailing: Taxis and ride-hailing services may be available from designated pickup areas outside the terminal, check locally on arrival.

Where to stay around Dupo

• St. Louis: Located 8 miles drive away from Dupo, St. Louis is a bustling metropolis where travelers can enjoy a mix of family-friendly activities and outdoor adventures. Iconic landmarks like the Gateway Arch offer a glimpse into the city’s cultural heritage, while Forest Park invites visitors for leisurely strolls and picnics. The Enterprise Center serves as a hub for exciting arena events, making it a great destination for sports fans and entertainment seekers alike.
• Columbia: Columbia is located 5 miles drive away from Dupo and is known for its picturesque outdoor spaces and romantic ambiance. The city features scenic lakes and parks perfect for family outings or a peaceful retreat. Key attractions, such as Jefferson Barracks Historic Park, add a touch of history to your visit. With its charming recreational areas and vibrant atmosphere, Columbia is an excellent choice for those looking to explore nature and create lasting memories.
• East St. Louis: Situated 7 miles away from Dupo, East St. Louis offers a dynamic experience with its family-oriented activities and urban landscape. Visitors can explore a variety of venues, including theaters and motor racing events. The Gateway Arch and the America’s Center Convention Complex are major highlights, providing opportunities for cultural engagement and business events. East St. Louis is a great spot for those looking to immerse themselves in the local scene while enjoying the thrill of city life.

Tips for short-haul flights to Dupo

For quick getaways, efficiency is key. Here is how to make your short-haul journey smoother:

• Pack light and skip checked bags—with budget airlines, traveling with just a carry-on is often more economical. Maximize space by using mini toiletries, wearing your bulkiest clothing, and planning outfits wisely. This approach also helps you avoid the wait at baggage claim upon arrival.
• Bring your own entertainment—many short-haul flights may lack in-flight entertainment options. Download your favorite TV shows, movies, music, or podcasts beforehand, and bring along a book to keep yourself engaged. Remember to fully charge your devices before you board.
• Arrive at the airport in plenty of time—for both short and domestic flights, it’s advisable to arrive at least 1.5 to 2 hours prior to departure, considering traffic and potential security lines.
• Bring your own snacks and water—pack some snacks and a refillable water bottle to stay hydrated and save money at the airport.

Tips for long-haul flights to Dupo

Flying long-haul sometimes requires extra planning to ensure a comfortable journey:

• Select your seat in advance—for longer flights, choosing your seat is essential for comfort. Full-service airlines typically allow free seat selection once online check-in opens, which is generally 24–48 hours prior to your flight. Some airlines even provide the option to select seats earlier than this.
• Arrive at the airport in plenty of time—make sure to arrive at the airport at least 3 hours before departure for international flights to accommodate check-in, security, and immigration procedures.
• Relax at the airport—if you have some extra time, feel free to explore the shops, grab a coffee, or unwind at your gate or in a departure lounge if you have access. Airport Wi-Fi is often free and available.
• Adjust to the new time zone mid-flight—begin syncing your body clock by changing your watch and modifying your sleep schedule to align with your destination's time zone. Aim to sleep or stay awake during the flight according to the local time at your destination to help minimize jet lag.

Tips to find the cheapest flights to Dupo

The cheapest day to fly

Get started finding a cheap flight to Dupo on Expedia by either choosing a deal on this page or entering into the search bar your travel dates, origin airport, and whether you want roundtrip or one-way airfare. You can filter for flexibility, number of stops, airline, and departure/arrival times to find the best flight for you.

The cheapest month to fly

October is the cheapest month to fly to Dupo. This coincides with the low season when fewer people travel. Whichever month you travel in, though, be sure to book at least a month in advance if you want to score cheap tickets to Dupo. ARC's data shows that domestic flights booked 28 days or more before departure are typically 24% cheaper than those booked last minute.

The most affordable time to book a flight

Typically, a Sunday can be the cheapest time to book a flight to Dupo, according to ARC’s data. On average, you could save between 6% and 13% by booking on a Sunday instead of a Friday, which is the most expensive day to make a reservation.

The cheapest round-trip tickets to Dupo

The lowest price for round-trip flights to Dupo in 2026 starts from $78, while one-way tickets start from from $43. Expedia's effective search tool is one of the best ways to find a budget airfare. Simply enter your dates, and within seconds, it'll show you a vast selection of the cheapest flights to Dupo. If you have a preferred departure time or airline, you can use the handy filters to customize your search.

The cheapest airlines flying to Dupo

Frontier Airlines, Southwest Airlines, Delta, American Airlines, United are just some of the airlines that can typically offer cheap tickets to Dupo. You can find their most affordable flights by using the “airline” search filter and then sorting prices from low to high. As a trusted partner of the world's leading airlines, Expedia offers you some of the best airfare deals to Dupo and countless more destinations worldwide.

The most affordable airports to fly into

To view the cheapest airports to fly into for Dupo, simply order your search results from lowest to highest price. Expedia's search tool compares flight prices for all airports close to your destination, so you don't have to manually search them one by one to find the cheapest flight to Dupo. If you have a preferred place to fly into, take advantage of the “arrival airport” filter to narrow down your search on Expedia.

Save with a package

With Expedia's amazing package deals, you could save hundreds of dollars by booking your Dupo plane tickets together with your accommodations, car rental, or activities. Just select the search wizard's “package” option to view some of the cheapest deals. Look out for the green savings label to see how much you're saving.

Date flexibility for the cheapest flights to Dupo

If you can be flexible with your travel dates, it's a good idea to broaden your search by comparing prices on different days. This will open up more options, meaning you could uncover a less expensive flight to Dupo.

Stopover savings

The cheapest tickets to Dupo are sometimes those with a stopover. Book one of these flights, and you'll change planes at an airport en route to Dupo. While the overall travel time might be longer than a non-stop flight, you may decide it's worth it for the money saved.

Get Expedia's Price Drop Protection

Price Drop Protection means that if your flight gets cheaper after booking, you'll be credited the difference*. This gives you peace of mind that you're getting one of the cheapest flights to Dupo for your chosen departure. Expedia's Price Drop Protection is available for a small fee but is free to One Key Gold and Platinum tier members.

*Terms apply.

Use our Price Tracking feature

Expedia's Price Tracking feature is another great tool that removes the guesswork from finding cheap flights to Dupo. Simply download the free Expedia app to your smart device and activate Dupo flight price alerts for your travel dates. There's even a price predictor tool that uses historical data to indicate the best time to book, giving you peace of mind that you'll nab the lowest prices.

Book with Expedia

As well as Price Drop Protection and Price Tracking, Expedia's close partnership with a vast selection of the world's leading airlines means you're sure to find cheap flights to Dupo. Plus, the One Key rewards program lets you earn real cash rewards on most bookings that you can use to save money on future trips. Best of all, it's free to join, and members often unlock exclusive discounts, too.

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.