Cheap flights To Union (STL) from $25

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Cheap Flights to Union from $25 One Way, $44 Round Trip

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

Thu, Sep 25 - Thu, Sep 25
ATL
Hartsfield-Jackson Atlanta Intl.
STL
Lambert-St. Louis Intl.
$44 Roundtrip, found 1 day ago
$44
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Thu, Sep 25 from Hartsfield-Jackson Atlanta Intl. to Lambert-St. Louis Intl., returning Thu, Sep 25, priced at $44 found 1 day ago
Fri, Sep 12 - Mon, Sep 15
LAS
Harry Reid Intl.
STL
Lambert-St. Louis Intl.
$72 Roundtrip, found 3 days ago
$72
Roundtrip
found 3 days ago
Select Frontier Airlines flight, departing Fri, Sep 12 from Harry Reid Intl. to Lambert-St. Louis Intl., returning Mon, Sep 15, priced at $72 found 3 days ago
Thu, Nov 13 - Sat, Nov 15
ORD
O'Hare Intl.
STL
Lambert-St. Louis Intl.
$77 Roundtrip, found 5 days ago
$77
Roundtrip
found 5 days ago
Select United flight, departing Thu, Nov 13 from O'Hare Intl. to Lambert-St. Louis Intl., returning Sat, Nov 15, priced at $77 found 5 days ago
Thu, Sep 11 - Sat, Sep 13
ORD
O'Hare Intl.
STL
Lambert-St. Louis Intl.
$79 Roundtrip, found 4 days ago
$79
Roundtrip
found 4 days ago
Select United flight, departing Thu, Sep 11 from O'Hare Intl. to Lambert-St. Louis Intl., returning Sat, Sep 13, priced at $79 found 4 days ago
Sun, Sep 7 - Sun, Sep 14
DFW
Dallas-Fort Worth Intl.
STL
Lambert-St. Louis Intl.
$79 Roundtrip, found 11 hours ago
$79
Roundtrip
found 11 hours ago
Select Frontier Airlines flight, departing Sun, Sep 7 from Dallas-Fort Worth Intl. to Lambert-St. Louis Intl., returning Sun, Sep 14, priced at $79 found 11 hours ago
Thu, Nov 13 - Sat, Nov 15
ORD
O'Hare Intl.
STL
Lambert-St. Louis Intl.
$91 Roundtrip, found 5 days ago
$91
Roundtrip
found 5 days ago
Select American Airlines flight, departing Thu, Nov 13 from O'Hare Intl. to Lambert-St. Louis Intl., returning Sat, Nov 15, priced at $91 found 5 days ago
Mon, Jan 26 - Thu, Jan 29
ORD
O'Hare Intl.
STL
Lambert-St. Louis Intl.
$97 Roundtrip, found 5 days ago
$97
Roundtrip
found 5 days ago
Select Southwest Airlines flight, departing Mon, Jan 26 from O'Hare Intl. to Lambert-St. Louis Intl., returning Thu, Jan 29, priced at $97 found 5 days ago
Thu, Sep 4 - Mon, Sep 8
BWI
Baltimore Washington Intl. Thurgood Marshall
STL
Lambert-St. Louis Intl.
$154 Roundtrip, found 22 hours ago
$154
Roundtrip
found 22 hours ago
Select Frontier Airlines flight, departing Thu, Sep 4 from Baltimore Washington Intl. Thurgood Marshall to Lambert-St. Louis Intl., returning Mon, Sep 8, priced at $154 found 22 hours ago
Mon, Sep 8 - Thu, Sep 11
EWR
Newark Liberty Intl. Airport
STL
Lambert-St. Louis Intl.
$157 Roundtrip, found 13 hours ago
$157
Roundtrip
found 13 hours ago
Select Frontier Airlines flight, departing Mon, Sep 8 from Newark Liberty Intl. Airport to Lambert-St. Louis Intl., returning Thu, Sep 11, priced at $157 found 13 hours ago
Fri, Sep 26 - Mon, Sep 29
LAX
Los Angeles Intl.
STL
Lambert-St. Louis Intl.
$160 Roundtrip, found 12 hours ago
$160
Roundtrip
found 12 hours ago
Select Frontier Airlines flight, departing Fri, Sep 26 from Los Angeles Intl. to Lambert-St. Louis Intl., returning Mon, Sep 29, priced at $160 found 12 hours ago

Union STL Flight Information

Traveling To
Union
Destination Airport IATA Code
STL
Number of Airlines Serving
1
Airlines
Frontier Airlines, American Airlines, Southwest Airlines, United
Flight Price
$44
Earliest Departing Flight
WN 527 9:35AM EDT
Latest Departing Flight
WN 2371 Sep 2 7:50PM EDT

Book Your Flight & Hotel Together & Save

Union economy flight packages

Price found within the past 48 hours. Click for updated prices.
The West End
2.0-star property

The West End

Oct 3 - Oct 9

6 night stay

Ontario (ONT) to St. Louis (STL)

Frontier Airlines • Non-stop roundtrip • Coach
Price was $618, price is now $480 per person
$480
per person
found 18 hours ago
Landing Downtown St. Louis
4.0-star property

Landing Downtown St. Louis

Oct 3 - Oct 9

6 night stay

Ontario (ONT) to St. Louis (STL)

Frontier Airlines • Non-stop roundtrip • Coach
Save 100% on your flight
Price was $705, price is now $549 per person
$549
per person
found 18 hours ago
Moonrise Hotel
4.0-star property

Moonrise Hotel

Oct 3 - Oct 9

6 night stay

Ontario (ONT) to St. Louis (STL)

Frontier Airlines • Non-stop roundtrip • Coach
Price was $898, price is now $745 per person
$745
per person
found 18 hours ago
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Union

Why search for low cost fares on your flights to Union when Orbitz offers the guaranteed lowest prices on foreign and domestic flights? When you travel with Orbitz you can benefit from:

Bargain Flights to Union

Orbitz offers massive discounts and substantial last-minute savings on your Union flights. Orbitz ensures that you can find, plan and reserve your flights any destination with ease, all while enjoying the guaranteed lowest prices available anywhere.

Cutting-Edge Mobile Tools to Keep You In The Know

Orbitz sends you free alerts and updates on your Union flight wherever you are in the world. Once you have downloaded the free app for your iPhone, Android, or iPad, you can review or alter any travel plans that you have made or even book a future flight for business or pleasure. If you need to reserve a hotel room when booking your flight, you will find exclusive deals on our mobile site.

Frequent Flyer Program Enrolment

Orbitz finds you the lowest fares, but you can still add your miles to your frequent flyer program to earn miles or points on selected flights to Union. When making your booking, reference your frequent flyer number to receive discounts in the future.

Outstanding Customer Service

Orbitz values your business and wants to ensure that all of your flights are as easy as possible to book. If you have booked a flight to Union but need to cancel it, you may be able to do so online. If you have any questions or need help, the dedicated Orbitz customer service team is always standing by.

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 $44 to $160 this week. The most affordable prices for one-way tickets were $25, 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.

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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.