Cheap flights To Union (STL) from $29

Earn rewards on top of your airline miles with Orbitz Rewards

Many airlines offer flexible change policies

Sign up to receive text alerts about your trip

Cheap Flights to Union from $29 One Way, $57 Round Trip

Prices found within past 7 days. Prices and availability subject to change. Additional terms may apply.

Wed, May 20 - Tue, May 26
ATL
Hartsfield-Jackson Atlanta Intl.
STL
Lambert-St. Louis Intl.
$57 Roundtrip, found 2 days ago
$57
Roundtrip
found 2 days ago
Select Frontier Airlines flight, departing Wed, May 20 from Hartsfield-Jackson Atlanta Intl. to Lambert-St. Louis Intl., returning Tue, May 26, priced at $57 found 2 days ago
Thu, May 21 - Tue, May 26
ATL
Hartsfield-Jackson Atlanta Intl.
STL
Lambert-St. Louis Intl.
$63 Roundtrip, found 1 day ago
$63
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Thu, May 21 from Hartsfield-Jackson Atlanta Intl. to Lambert-St. Louis Intl., returning Tue, May 26, priced at $63 found 1 day ago
Wed, May 13 - Wed, May 20
ATL
Hartsfield-Jackson Atlanta Intl.
STL
Lambert-St. Louis Intl.
$67 Roundtrip, found 4 days ago
$67
Roundtrip
found 4 days ago
Select Frontier Airlines flight, departing Wed, May 13 from Hartsfield-Jackson Atlanta Intl. to Lambert-St. Louis Intl., returning Wed, May 20, priced at $67 found 4 days ago
Sat, Apr 25 - Mon, Apr 27
DEN
Denver Intl.
STL
Lambert-St. Louis Intl.
$69 Roundtrip, found 4 days ago
$69
Roundtrip
found 4 days ago
Select Frontier Airlines flight, departing Sat, Apr 25 from Denver Intl. to Lambert-St. Louis Intl., returning Mon, Apr 27, priced at $69 found 4 days ago
Wed, Jun 3 - Mon, Jun 8
ATL
Hartsfield-Jackson Atlanta Intl.
STL
Lambert-St. Louis Intl.
$69 Roundtrip, found 17 hours ago
$69
Roundtrip
found 17 hours ago
Select Frontier Airlines flight, departing Wed, Jun 3 from Hartsfield-Jackson Atlanta Intl. to Lambert-St. Louis Intl., returning Mon, Jun 8, priced at $69 found 17 hours ago
Sat, Jun 6 - Mon, Jun 8
DEN
Denver Intl.
STL
Lambert-St. Louis Intl.
$70 Roundtrip, found 6 days ago
$70
Roundtrip
found 6 days ago
Select Frontier Airlines flight, departing Sat, Jun 6 from Denver Intl. to Lambert-St. Louis Intl., returning Mon, Jun 8, priced at $70 found 6 days ago
Sat, May 23 - Thu, May 28
DEN
Denver Intl.
STL
Lambert-St. Louis Intl.
$71 Roundtrip, found 6 hours ago
$71
Roundtrip
found 6 hours ago
Select Frontier Airlines flight, departing Sat, May 23 from Denver Intl. to Lambert-St. Louis Intl., returning Thu, May 28, priced at $71 found 6 hours ago
Fri, May 1 - Mon, May 4
BWI
Baltimore Washington Intl. Thurgood Marshall
STL
Lambert-St. Louis Intl.
$142 Roundtrip, found 1 day ago
$142
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Fri, May 1 from Baltimore Washington Intl. Thurgood Marshall to Lambert-St. Louis Intl., returning Mon, May 4, priced at $142 found 1 day ago
Tue, May 12 - Fri, May 15
IAD
Washington Dulles Intl.
STL
Lambert-St. Louis Intl.
$142 Roundtrip, found 7 hours ago
$142
Roundtrip
found 7 hours ago
Select Frontier Airlines flight, departing Tue, May 12 from Washington Dulles Intl. to Lambert-St. Louis Intl., returning Fri, May 15, priced at $142 found 7 hours ago
Fri, May 8 - Fri, May 15
TPA
Tampa Intl.
STL
Lambert-St. Louis Intl.
$142 Roundtrip, found 13 hours ago
$142
Roundtrip
found 13 hours ago
Select Frontier Airlines flight, departing Fri, May 8 from Tampa Intl. to Lambert-St. Louis Intl., returning Fri, May 15, priced at $142 found 13 hours ago

Union Flight Information

Traveling To
Union
Destination Airport IATA Code
STL
Number of Airlines Serving
Airlines
Frontier Airlines
Flight Price
$57
Earliest Departing Flight
Latest Departing Flight

Book Your Flight & Hotel Together & Save

Union economy flight packages

Price found within the past 48 hours. Click for updated prices.
Angad Arts Hotel St. Louis, Tapestry Collection by Hilton
4.0-star property

Angad Arts Hotel St. Louis, Tapestry Collection by Hilton

Jun 1 - Jun 3

2 night stay

Atlanta (ATL) to St. Louis (STL)

Frontier Airlines • Roundtrip • Coach
Save 100% on your flight
Price was $309, price is now $215 per person
$215
per person
found 21 hours ago
Crowne Plaza St. Louis Airport by IHG
3.5-star property

Crowne Plaza St. Louis Airport by IHG

May 15 - May 19

4 night stay

Atlanta (ATL) to St. Louis (STL)

Frontier Airlines • Roundtrip • Coach
Save 100% on your flight
Price was $485, price is now $349 per person
$349
per person
found 1 day ago
Hilton Garden Inn St. Louis/O'Fallon MO
3.0-star property

Hilton Garden Inn St. Louis/O'Fallon MO

May 15 - May 19

4 night stay

Atlanta (ATL) to St. Louis (STL)

Frontier Airlines • Roundtrip • Coach
Save 100% on your flight
Price was $824, price is now $603 per person
$603
per person
found 1 day ago
Don't see what you're looking for?
See all available trips from Atlanta to Union
View all trips

Union

Are you in the mood for a cruise? Shop Orbitz today for cheap cruises and flights to Union. Our award-winning cruise site features exclusive offers, information for first-timers and top destinations and activities. Make discount domestic and international travel plans in an instant with cutting-edge mobile tools from Orbitz.

Top Pick

Orbitz holds a “Best of the Web” Cruise Site Award from Forbes Magazine. You won’t find better deals anywhere on low cost cruises and low fare Union flights. Our Customer Care and guaranteed low prices make Orbitz the team to beat in budget cruises and air ticket sales.

Exclusive Offers

Register for Orbitz email updates and our cruise experts will notify you of bargain tickets on cruises as they’re posted. Install our free mobile apps on your iPad, iPhone or Android for easy booking and mobile-only savings on flights to Union. Visit www.Orbitz.com to learn more about these amazing benefits and our 110% Best Price Guarantee.

First-Timers

Are you and your family cruise newbies? Orbitz offers Cruising 101 and Cruise FAQ to answer any questions you may have. Book your cruise and air travel with Orbitz On the Go for greater savings on Union flights.

Ports and Play

Be sure to check our cruise page for free shore excursions, onboard spending, balcony upgrades and other perks. Orbitz offers last-minute, luxury, weekend and summer cruises. You can even designate which port you want to sail from and pre-book on-shore activities. Get there on the cheap with discounts on flights to Union and Union flights. Get more bang for your travel buck at Orbitz.

Frequently asked questions

Which airlines fly to Union?
With 20 airlines to pick from, finding the ideal flight that suits your travel dates and budget will be a breeze. Lambert-St. Louis Intl. Airport (STL) is a major gateway to Union and where you'll likely be touching down. These well-known international airlines are ready to take you there:

  • Air Canada - 35 flights to Union per month
  • Frontier Airlines - 17 flights to Union per month
  • Lufthansa - 3 flights to Union per month

How much is a flight to Union?
If you're hunting down a return flight, fares ranged from $57 to $142 this week. The most affordable prices for one-way tickets were $29, originating from Denver (DEN).
How to book the cheapest flight to Union?
Scoring cheap flights to Union is as easy as booking your ticket with Orbitz. But if you'd love to make sure you're nabbing the best flight deals around, here are a few tips your budget will love:

  • Consider departing from or arriving at nearby airports for a cheaper fare. Enter your preferred departure and arrival points in the form fields, then select the 'Nearby airports' function below. It will list the available options.
  • If your plans aren't etched in stone, click on the 'Show flexible dates' link to see the flight deals across different departure dates. Go with any suitable cheaper fare that pops up.
  • Hit 'Show options' to fine tune your search results. You can pick your preferred seating class and airline here. Under 'Sort & Filter' to the left, you can even specify whether you'd like to fly in the morning, afternoon or evening.
  • Book your airfare as soon as you've decided on your travel dates. While it does happen now and then, airline tickets rarely get more affordable as your date of departure gets closer.
  • Consider combining your flights, hotels and car rentals into one convenient package deal to stretch your budget even further.
  • Don't travel during the busy season if you can. By avoiding summer and school vacations, you can make amazing savings on your airfare.

What is the best time to book a flight to Union?
Snap up a bargain and book your seats to Union in January. If you've missed this month, fear not. February and August often have low airfares as well. Just make sure you don't snooze on a sale — cheap flights come and go in the blink of an eye!
What day of the week is the cheapest to book a flight to Union?
Make a booking on a Tuesday, Wednesday or Saturday. Typically, these are the cheapest days of the week to purchase airfares to Union. The vacation of your dreams starts with a great flight deal!
What is the cheapest day of the week to fly to Union?
If you're looking for cheap flights to Union, leave earlier in the week. Orbitz data from 2020 shows Monday is the cheapest day to jet off, followed by Tuesday. Saturday has the most expensive fares, so avoid this day and do your bank account a favor.
What is the cheapest month to fly to Union?
To book cheap flights to Union, you should pack your bags and take off in August. Orbitz data has found that this is generally the best month to save loads on your fare. If you want to jet to Union in June, be aware that this is the least affordable time of year to take a trip.
Which airlines allow free cancellation?
When searching for flights on Orbitz, click on "Filter by flexible change policies." This filter will show you all the airlines offering free cancellation and no change fees. Relax knowing that if things change, your flight can too.
What do I need for the flight to Union?
There's nothing more enjoyable than flying off to a cool new destination, but it's wise to be prepared. This list of useful tips will help get your journey started on the right foot:

  • Before you step foot on the plane, you'll need to show proof of identification, such as a passport. You'll also need your boarding pass. If you're traveling with the kids, check with your airline about which documents they may need.
  • To keep you busy on your short trip to Union, download some new music or stock up the audiobook library on your tablet. Food can also be a welcome distraction while in the air, so maybe even bring some light snacks.
  • It can get very cool on the plane. If you don't want to shiver your way through the flight, dress in layers.

How do I get cheap first-class/business deals to Union?
Smart travelers know how to find first or business-class airfares to Union without the steep price tag. You can do the same with these helpful tips:

  • Be more flexible with your travel dates and hold out for deals on first or business-class airfares.
  • A lot of low-cost airlines nowadays offer superb business or premium-class seating without the pricey fees.
  • Make a bid for an upgrade. Some carriers hold online auctions that let you put down a price for a seat up the front. You may also be able to upgrade with points earned through a loyalty program.

What is the best time to go to Union?
If you want to immerse yourself in the culture of Union in the busy season, April, May and June are the prime months to visit. June 20 signals the start of summertime in the Northern Hemisphere and is a fantastic time to travel if you delight in the open air. During this time of year, average daily temperatures typically range from 65 ºF to 90 ºF.

More to Explore

Fare, taxes & fees: Fares include all taxes and fees, except baggage fees. Rates shown reflect fares found by other Orbitz users over the past 7 days. Due to rapidly changing airline prices & seat availability, these fares may no longer be available.

Refunds/changes/cancellations: Itinerary changes, if permitted for the fare, will have a $30 service fee charged by Orbitz. Additional airline charges may apply.

Other conditions: Schedules, fares and rules are subject to change without notice. Seats are limited and may not be available on all flights/dates or in all markets. Lower fares may be available. Fares will not be honored retroactively or in exchange for any wholly/partially unused ticket. Tickets are non-transferable and non-refundable. Fare rules are provided for the selected itinerary before booking.