Cheap Flights to Union, MO

Popular airlines to Union

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What you need to know for your flight to Union

Flights to Union at a glance

Traveling to Union is easy—simply choose from a range of affordable Union flights, including full-service and budget-friendly options. Compare journey times to find the best fit for your schedule and wallet, and get ready to explore the city's renowned sights and vibrant neighborhoods.

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

Popular airport near Union

Union is a vibrant city perfect for outdoor and family adventure vacations. Visitors flock to Union for its stunning scenery and entertainment options. The city is conveniently served by major airports, including those in Missouri, making travel to Union seamless for all types of adventurers.

  • Lambert-St. Louis International Airport (STL): Situated in St. Louis County, Missouri, approximately 40 miles from Union, this airport caters to both domestic and international travelers. It boasts connections to around 210 domestic cities and 110 international locations. Passengers have the option to elevate their travel experience by selecting from first class, premium economy, or business class seating, depending on the airline and route. Major airlines operating here include Southwest Airlines, American Airlines, and Delta.

Top routes to Union

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

Cheapest routes to Union

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

  • American Airlines: Operating flights to Lambert-St. Louis International Airport (STL), American Airlines represents approximately 28% of the arrivals to Union. The typical one-way fare is around $330, with premium service options that may include first class depending on the route.
  • Southwest Airlines: Serving Lambert-St. Louis International Airport (STL), Southwest Airlines is responsible for about 27% of arrivals to Union. Passengers can expect an average one-way fare of roughly $240.
  • Delta: With flights to Lambert-St. Louis International Airport (STL), Delta accounts for around 20% of arrivals to Union. The average one-way fare hovers around $290, and premium cabin choices may feature premium economy and first class, depending on the route.
  • United: Operating at Lambert-St. Louis International Airport (STL), United makes up about 15% of arrivals to Union. Travelers can anticipate an average one-way fare of approximately $320, with premium service options that may include first class based on the route.
  • Frontier Airlines: Providing service to Lambert-St. Louis International Airport (STL), Frontier Airlines contributes approximately 5% of arrivals to Union. It offers an affordable option with average one-way fares around $150.

Best time to fly to Union

The most popular months for travelers to fly to Union are January, March, and April, when peak temperatures in Union can reach up to 55.4°F in April. If you prefer quieter travel, consider September, the least busy time to visit with temperatures around 69.8°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.

calendar iconMonthtemperature iconTemperaturerain iconPrecipitationmostly cloudy iconCloudinesscrowd level iconDemandprice iconAverage one-way Fare
January31.6°F (-0.2°C)Light RainMostly CloudyModerately High$277
February34.7°F (1.5°C)Light RainMostly SunnyAverage$245
March46.0°F (7.8°C)Light RainMostly SunnyModerately High$273
April55.4°F (13.0°C)Light RainMostly SunnyModerately High$249
May65.3°F (18.5°C)Light RainMostly SunnyAverage$229
June75.0°F (23.9°C)Light RainMostly SunnyAverage$258
July78.1°F (25.6°C)Light RainMostly SunnyAverage$251
August76.1°F (24.5°C)Light RainMostly SunnyAverage$235
September69.8°F (21.0°C)Light RainMostly SunnyModerately Low$222
October57.6°F (14.2°C)Light RainMostly SunnyAverage$225
November45.7°F (7.6°C)Light RainMostly SunnyModerately Low$243
December37.4°F (3.0°C)Light RainMostly SunnyModerately Low$249

*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 Union

Getting some of the best deals on flights to Union 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 Union 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 Union flight with Expedia. Just select your frequent flyer program and enter your program number when confirming your booking.

*For members. Select hotels.

Arriving in Union

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

  • Public transportation: From Lambert-St. Louis International Airport, Lambert Main Terminal Station, a metro station, is conveniently located only 0.1 miles from the airport, making it an easy walk for travelers.
  • Hotel transfer: Transfers offer a convenient way to reach your hotel in Union, with private rides that can be arranged in advance.
  • Car rental: Renting a car in Union is a good option if you plan to explore and sightsee beyond the city. Browse cheap car rentals in Union 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 Union

  • Pacific: Located 15 miles drive away from Union, Pacific is an exciting destination for families and adventure enthusiasts. Visitors can enjoy thrilling experiences at the nearby Six Flags St. Louis amusement park or explore the scenic Route 66 State Park. For those seeking a unique outing, Purina Farms offers a delightful glimpse into farm life. With its mix of outdoor activities and entertainment options, Pacific is ideal for a fun-filled day trip.
  • Villa Ridge: Villa Ridge is located 7 miles away from Union and is a charming spot for families and outdoor adventurers alike. The area features engaging activities at places like Six Flags St. Louis and Purina Farms, along with the beautiful Shaw Nature Reserve for nature lovers. With its combination of amusement parks and natural beauty, Villa Ridge is perfect for a memorable family outing or a weekend adventure.
  • Washington: Situated 7 miles drive away from Union, Washington is a picturesque city that offers outdoor recreation and a touch of romance. Visitors can unwind at Rennick Riverfront Park, perfect for family picnics and leisurely strolls. For those interested in history, Fort Charrette Historic Village provides a fascinating cultural experience. With its inviting lakes and parks, Washington is an excellent choice for a relaxing getaway or a fun day in the sun.

Tips for short-haul flights to Union

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

  • Pack light and skip checked bags—for budget airlines, traveling with just a carry-on is often more economical. Maximize space by bringing mini toiletries, wearing your bulkiest clothing, and planning outfits strategically. 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 TV shows, movies, music, or podcasts ahead of time, and consider bringing a book to keep yourself entertained. 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 before your departure time, allowing for potential traffic and security delays.
  • Bring your own snacks and water—pack some snacks and a refillable water bottle to stay hydrated and save money while at the airport.

Tips for long-haul flights to Union

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 usually 24–48 hours before your flight. Some airlines may offer earlier seat selection options.
  • Arrive at the airport in plenty of time—aim to be at the airport at least 3 hours prior to departure for international flights to ensure you have enough time for check-in, security, and immigration procedures.
  • Relax at the airport—if you have some extra time, take the opportunity to browse the shops, grab a coffee, or unwind at the gate or in a departure lounge if you have access. Airport Wi-Fi is generally free and available.
  • Adjust to the new time zone mid-flight—begin to sync your body clock by changing your watch and adjusting your sleep schedule to align with your destination's time zone. Try to sleep or stay awake during the flight according to the local time at your arrival destination to help mitigate jet lag.

Frequently asked questions

What month is the cheapest to fly to Union?
Plan your trip for if you want to get a deal on your fare. It's the cheapest month to fly to Union. If possible, avoid traveling during peak periods such as public holidays or school breaks.
Which US cities have the cheapest flights to Union?
Get cheap flights to Union from Chicago, Dallas and Denver. These cities generally offer the best fares to this popular destination. But bear in mind that stopovers, holiday periods and demand will also have an influence on rates, so remain flexible and book when you spot a bargain.
Which US cities fly direct to Union?
There are 55 US cities you're able to fly to Union directly from. Explore your options by using the "Direct flights only" filter on Expedia and find the best departure point for your trip. Here are several of the leading cities to leave from:

  • Chicago
  • Dallas
  • Denver
  • New York
  • Atlanta

How to find a cheap flight to Union?
To secure cheap flights to Union, book in advance or travel during the off-peak months of January and August. Want an insider tip? Take off on a Thursday and save around 16% on average compared to traveling on a Sunday.* Opt to receive price alerts on the Expedia app and you'll get notified as soon as your fares go down.*Best day of the week to book, depart and ideal booking window recommendations based on average round-trip ticket prices for January through August 2023, sourced from Airline Reporting Corporation's (ARC) global airline sales database. Percentages noted are averages.
How to get a cheap last-minute flight to Union?
Although booking in advance is usually the easiest way to save cash, don't panic if your Union trip is last minute. You can still find cheap flights to Union, especially if your plans have some flexibility. Try switching up your trip dates, exploring different ticket options or departing from another hub.
How far in advance should I book a flight to Union?
Find the travel dates you want and a fare you'll love by booking your domestic flight to Union up to 28 days in advance. Search for tickets between two and four months ahead if you're traveling to Union from an international destination.**Best day of the week to book, depart and ideal booking window recommendations based on average round-trip ticket prices for January through August 2023, sourced from Airline Reporting Corporation's (ARC) global airline sales database. Percentages noted are averages.
Which day of the week is the cheapest day to buy a plane ticket to Union?
You can usually get cheap flights to Union on a Sunday. You'll save around 8% on average compared to those who book on a Friday, which is typically the most expensive day for tickets.**Best day of the week to book, depart and ideal booking window recommendations based on average round-trip ticket prices for January through August 2023, sourced from Airline Reporting Corporation's (ARC) global airline sales database. Percentages noted are averages.
Which airlines fly to Union?
There are 10 airlines that connect Union with 33 airports globally. The chief entry point to this city is Lambert-St. Louis Intl. Airport (STL). Fly with any of these leading airlines to Union:

  • Delta Air Lines
  • American Airlines
  • United Airlines
  • Southern Airways Express

Where do you fly into Union?
If you're flying to Union, the main hub to arrive at is Lambert-St. Louis Intl. Airport (STL). You could also fly to Union via Spirit of St. Louis Airport (SUS).
How far is the airport from central Union?
If you're touching down at Lambert-St. Louis Intl. Airport (STL), you'll be about 40 mi northeast of the center of Union.
Can I save money by booking a Union trip package?
You could possibly save hundreds of dollars if you lock in an Union flight and hotel package deal on Expedia. And you'll make life easier by having all your travel plans in one place. Try bundling your hotel and flight with extras such as activities and car rentals for your own customized Union vacation.
Can I change or cancel my flight to Union?
It's usually possible to change or cancel your flight to Union. Many airlines allow you to cancel flights for free within 24 hours of making your booking. However, some flights are non-refundable, and airlines may offer you a credit toward future flights in place of a direct refund. To find cheap flights to Union with flexible change policies, select "Changes included" or "No cancel fee" during your search. Need more information? Head to our Customer Service Portal.

*Flight schedules are subject to change.

*Available to One Key members.

 

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Travel information

Destination airport
Union
Destination airport IATA code
STL

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