Cheap flights To Union (STL) from $29

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Cheap Flights to Union from $29 One Way, $79 Round Trip

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

Thu, Apr 9 - Wed, Apr 15
ATL
Hartsfield-Jackson Atlanta Intl.
STL
Lambert-St. Louis Intl.
$79 Roundtrip, just found
$79
Roundtrip
just found
Select Frontier Airlines flight, departing Thu, Apr 9 from Hartsfield-Jackson Atlanta Intl. to Lambert-St. Louis Intl., returning Wed, Apr 15, priced at $79 just found
Thu, Apr 23 - Wed, Apr 29
ATL
Hartsfield-Jackson Atlanta Intl.
STL
Lambert-St. Louis Intl.
$80 Roundtrip, found 6 days ago
$80
Roundtrip
found 6 days ago
Select Frontier Airlines flight, departing Thu, Apr 23 from Hartsfield-Jackson Atlanta Intl. to Lambert-St. Louis Intl., returning Wed, Apr 29, priced at $80 found 6 days ago
Mon, Apr 13 - Mon, Apr 13
DEN
Denver Intl.
STL
Lambert-St. Louis Intl.
$81 Roundtrip, found 6 days ago
$81
Roundtrip
found 6 days ago
Select Frontier Airlines flight, departing Mon, Apr 13 from Denver Intl. to Lambert-St. Louis Intl., returning Mon, Apr 13, priced at $81 found 6 days ago
Thu, May 7 - Tue, May 19
ATL
Hartsfield-Jackson Atlanta Intl.
STL
Lambert-St. Louis Intl.
$81 Roundtrip, found 4 days ago
$81
Roundtrip
found 4 days ago
Select Frontier Airlines flight, departing Thu, May 7 from Hartsfield-Jackson Atlanta Intl. to Lambert-St. Louis Intl., returning Tue, May 19, priced at $81 found 4 days ago
Fri, May 15 - Mon, May 18
ATL
Hartsfield-Jackson Atlanta Intl.
STL
Lambert-St. Louis Intl.
$88 Roundtrip, found 4 hours ago
$88
Roundtrip
found 4 hours ago
Select Frontier Airlines flight, departing Fri, May 15 from Hartsfield-Jackson Atlanta Intl. to Lambert-St. Louis Intl., returning Mon, May 18, priced at $88 found 4 hours ago
Fri, May 15 - Mon, May 18
ATL
Hartsfield-Jackson Atlanta Intl.
STL
Lambert-St. Louis Intl.
$89 Roundtrip, found 4 hours ago
$89
Roundtrip
found 4 hours ago
Select Frontier Airlines flight, departing Fri, May 15 from Hartsfield-Jackson Atlanta Intl. to Lambert-St. Louis Intl., returning Mon, May 18, priced at $89 found 4 hours ago
Thu, Aug 6 - Mon, Aug 10
DFW
Dallas-Fort Worth Intl.
STL
Lambert-St. Louis Intl.
$144 Roundtrip, found 5 days ago
$144
Roundtrip
found 5 days ago
Select Frontier Airlines flight, departing Thu, Aug 6 from Dallas-Fort Worth Intl. to Lambert-St. Louis Intl., returning Mon, Aug 10, priced at $144 found 5 days ago
Sat, May 2 - Mon, May 4
BWI
Baltimore Washington Intl. Thurgood Marshall
STL
Lambert-St. Louis Intl.
$180 Roundtrip, found 6 days ago
$180
Roundtrip
found 6 days ago
Select Frontier Airlines flight, departing Sat, May 2 from Baltimore Washington Intl. Thurgood Marshall to Lambert-St. Louis Intl., returning Mon, May 4, priced at $180 found 6 days ago
Thu, Apr 30 - Wed, May 6
EWR
Newark Liberty Intl. Airport
STL
Lambert-St. Louis Intl.
$180 Roundtrip, found 2 days ago
$180
Roundtrip
found 2 days ago
Select Frontier Airlines flight, departing Thu, Apr 30 from Newark Liberty Intl. Airport to Lambert-St. Louis Intl., returning Wed, May 6, priced at $180 found 2 days ago
Tue, Apr 7 - Fri, Apr 17
IAD
Washington Dulles Intl.
STL
Lambert-St. Louis Intl.
$184 Roundtrip, found 1 hour ago
$184
Roundtrip
found 1 hour ago
Select Frontier Airlines flight, departing Tue, Apr 7 from Washington Dulles Intl. to Lambert-St. Louis Intl., returning Fri, Apr 17, priced at $184 found 1 hour ago

Union Flight Information

Traveling To
Union
Destination Airport IATA Code
STL
Number of Airlines Serving
Airlines
Frontier Airlines, Southwest Airlines
Flight Price
$79
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

Apr 17 - Apr 19

2 night stay

Detroit (DTW) to St. Louis (STL)

Southwest Airlines • Roundtrip • Coach
Price was $552, price is now $501 per person
$501
per person
found 1 day ago
The Wildwood Hotel
3.5-star property

The Wildwood Hotel

Apr 17 - Apr 19

2 night stay

Detroit (DTW) to St. Louis (STL)

Southwest Airlines • Roundtrip • Coach
Price was $798, price is now $557 per person
$557
per person
found 1 day ago
St. Louis Union Station Hotel, Curio Collection by Hilton
4.0-star property

St. Louis Union Station Hotel, Curio Collection by Hilton

Apr 17 - Apr 19

2 night stay

Detroit (DTW) to St. Louis (STL)

Southwest Airlines • Roundtrip • Coach
Price was $1,194, price is now $1,080 per person
$1,080
per person
found 1 day ago
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Union

End your search for discount fares on flights to Union. Orbitz has all the best prices on Union flights. With Orbitz, you can expect:

Cheap Deals on Flights to Union

We offer big discounts and last-minute savings on Union flights. We make it easy for you to research, plan, and book your flight to Union — all while offering great low fares. With guaranteed low prices and cutting-edge mobile tools, the perfect trip begins on Orbitz.

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Get alerts, updates, or book your Union flight or other flights wherever you are. Download our free apps for iPhone, Android, and iPad or visit our mobile site at m.orbitz.com to conveniently review or change your air travel plans. We can also send free alerts about your Union flight to your email or mobile phone, so you get advance warning about potential disruptions and flight delays. Need to book a hotel with your Union flight? Access exclusive, mobile-only deals via our mobile site and free apps – even on the same day.

Great Customer Care

We want to make your travel booking experience smooth and easy, from planning and researching Union flights to the actual booking. If you want to cancel your flight to Union, many tickets can be conveniently cancelled online. Contact our Customer Service to make changes to your air ticket.

Miles or Points Toward Frequent Flyer Programs

Much like booking with an airline directly, you can earn frequent flyer miles or points on qualified flights to Union with Orbitz. When completing your booking, just fill in your frequent flyer number for the airline you are flying with or for one of its available partner airlines.

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 $79 to $184 this week. The most affordable prices for one-way tickets were $29, originating from Atlanta (ATL).
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.