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Union

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Union Flights as Low as $47

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

Frontier Airlines
Wed, Dec 2 - Mon, Dec 7
ATL
Hartsfield-Jackson Atlanta Intl.
STL
Lambert-St. Louis Intl.
$47 Roundtrip, just found
$47
Roundtrip
just found
Select Frontier Airlines flight, departing Wed, Dec 2 from Hartsfield-Jackson Atlanta Intl. to Lambert-St. Louis Intl., returning Mon, Dec 7, priced at $47 just found
Frontier Airlines
Mon, Dec 14 - Mon, Jan 4
ATL
Hartsfield-Jackson Atlanta Intl.
STL
Lambert-St. Louis Intl.
$48 Roundtrip, found 5 hours ago
$48
Roundtrip
found 5 hours ago
Select Frontier Airlines flight, departing Mon, Dec 14 from Hartsfield-Jackson Atlanta Intl. to Lambert-St. Louis Intl., returning Mon, Jan 4, priced at $48 found 5 hours ago
Frontier Airlines
Wed, Nov 18 - Wed, Dec 2
ATL
Hartsfield-Jackson Atlanta Intl.
STL
Lambert-St. Louis Intl.
$52 Roundtrip, found 1 hour ago
$52
Roundtrip
found 1 hour ago
Select Frontier Airlines flight, departing Wed, Nov 18 from Hartsfield-Jackson Atlanta Intl. to Lambert-St. Louis Intl., returning Wed, Dec 2, priced at $52 found 1 hour ago
Frontier Airlines
Wed, Nov 18 - Mon, Dec 7
ATL
Hartsfield-Jackson Atlanta Intl.
STL
Lambert-St. Louis Intl.
$53 Roundtrip, found 1 hour ago
$53
Roundtrip
found 1 hour ago
Select Frontier Airlines flight, departing Wed, Nov 18 from Hartsfield-Jackson Atlanta Intl. to Lambert-St. Louis Intl., returning Mon, Dec 7, priced at $53 found 1 hour ago
Frontier Airlines
Fri, Dec 4 - Fri, Dec 11
DEN
Denver Intl.
STL
Lambert-St. Louis Intl.
$80 Roundtrip, found 3 hours ago
$80
Roundtrip
found 3 hours ago
Select Frontier Airlines flight, departing Fri, Dec 4 from Denver Intl. to Lambert-St. Louis Intl., returning Fri, Dec 11, priced at $80 found 3 hours ago
Delta
Mon, Nov 23 - Mon, Nov 23
MSP
Minneapolis - St. Paul Intl.
STL
Lambert-St. Louis Intl.
$112 Roundtrip, found 21 hours ago
$112
Roundtrip
found 21 hours ago
Select Delta flight, departing Mon, Nov 23 from Minneapolis - St. Paul Intl. to Lambert-St. Louis Intl., returning Mon, Nov 23, priced at $112 found 21 hours ago
American Airlines
Sat, Jan 23 - Mon, Jan 25
ORD
O'Hare Intl.
STL
Lambert-St. Louis Intl.
$117 Roundtrip, just found
$117
Roundtrip
just found
Select American Airlines flight, departing Sat, Jan 23 from O'Hare Intl. to Lambert-St. Louis Intl., returning Mon, Jan 25, priced at $117 just found
Southwest Airlines
Tue, Feb 9 - Fri, Feb 19
MSP
Minneapolis - St. Paul Intl.
STL
Lambert-St. Louis Intl.
$117 Roundtrip, found 1 hour ago
$117
Roundtrip
found 1 hour ago
Select Southwest Airlines flight, departing Tue, Feb 9 from Minneapolis - St. Paul Intl. to Lambert-St. Louis Intl., returning Fri, Feb 19, priced at $117 found 1 hour ago
United
Sat, Jan 23 - Mon, Jan 25
ORD
O'Hare Intl.
STL
Lambert-St. Louis Intl.
$117 Roundtrip, just found
$117
Roundtrip
just found
Select United flight, departing Sat, Jan 23 from O'Hare Intl. to Lambert-St. Louis Intl., returning Mon, Jan 25, priced at $117 just found
Frontier Airlines
Thu, Nov 19 - Fri, Dec 4
DFW
Dallas-Fort Worth Intl.
STL
Lambert-St. Louis Intl.
$150 Roundtrip, found 2 hours ago
$150
Roundtrip
found 2 hours ago
Select Frontier Airlines flight, departing Thu, Nov 19 from Dallas-Fort Worth Intl. to Lambert-St. Louis Intl., returning Fri, Dec 4, priced at $150 found 2 hours ago
Frontier Airlines
Wed, Nov 25 - Fri, Dec 4
FLL
Fort Lauderdale - Hollywood Intl.
STL
Lambert-St. Louis Intl.
$199 Roundtrip, found 15 hours ago
$199
Roundtrip
found 15 hours ago
Select Frontier Airlines flight, departing Wed, Nov 25 from Fort Lauderdale - Hollywood Intl. to Lambert-St. Louis Intl., returning Fri, Dec 4, priced at $199 found 15 hours ago
Frontier Airlines
Wed, Nov 18 - Wed, Dec 2
LAX
Los Angeles Intl.
STL
Lambert-St. Louis Intl.
$238 Roundtrip, found 8 hours ago
$238
Roundtrip
found 8 hours ago
Select Frontier Airlines flight, departing Wed, Nov 18 from Los Angeles Intl. to Lambert-St. Louis Intl., returning Wed, Dec 2, priced at $238 found 8 hours ago
Delta
Wed, Dec 9 - Wed, Jan 6
SFO
San Francisco Intl.
STL
Lambert-St. Louis Intl.
$254 Roundtrip, found 2 hours ago
$254
Roundtrip
found 2 hours ago
Select Delta flight, departing Wed, Dec 9 from San Francisco Intl. to Lambert-St. Louis Intl., returning Wed, Jan 6, priced at $254 found 2 hours ago
Southwest Airlines
Tue, Nov 24 - Wed, Dec 9
DAL
Love Field
STL
Lambert-St. Louis Intl.
$299 Roundtrip, found 5 hours ago
$299
Roundtrip
found 5 hours ago
Select Southwest Airlines flight, departing Tue, Nov 24 from Love Field to Lambert-St. Louis Intl., returning Wed, Dec 9, priced at $299 found 5 hours ago
Alaska Airlines
Thu, Dec 31 - Tue, Jan 12
SFO
San Francisco Intl.
STL
Lambert-St. Louis Intl.
$338 Roundtrip, found 9 hours ago
$338
Roundtrip
found 9 hours ago
Select Alaska Airlines flight, departing Thu, Dec 31 from San Francisco Intl. to Lambert-St. Louis Intl., returning Tue, Jan 12, priced at $338 found 9 hours ago
Bargain Flight
Fri, Nov 6 - Sat, Nov 14
MSY
Louis Armstrong New Orleans Intl.
STL
Lambert-St. Louis Intl.
$379 Roundtrip, just found
$379
Roundtrip
just found
Select Bargain Flight flight, departing Fri, Nov 6 from Louis Armstrong New Orleans Intl. to Lambert-St. Louis Intl., returning Sat, Nov 14, priced at $379 just found

Cheap Flights to Union

Fall in love at first flight with your vacation to Union by saving a ton of cash on your last-minute cheap flight. There’s no more scouring the internet for a good deal—book your flight to Union on Hotwire, and you’ll be up, up, and on a getaway in no time.

Because once the wheels are down in Union, the good times start rolling. So buckle up, you’re in for a fun ride.

Frequently Asked Questions About flights to Union

Don’t waste your time on endless searches for cheap airline tickets oneway or roundtrip. We’ll have you on your way to Union with a tiny bag of pretzels in your hand before you can say “tray tables in the upright position”—and for a ticket price that works for your vacay budget.

So all you have to worry about is where you’re headed after the STL airport.

What is the cheapest month to fly to Union?

Airline ticket prices fluctuate all the time, depending on the day of the week or the month of the year. The cheapest round trip flights to Union are in December, but when you book your flight on Hotwire, savings are always in season.

How many airlines fly to Union?

Variety is the spice of life, even when it comes to booking your next trip. Want options for airlines? You’ll find 15 to choose from for your flight to Union.

What airport is best to fly into Union?

When you’re planning your trip to Union, convenience is the name of the game. Luckily, Union Spirit of St. Louis Airport is nearby so you can deplane and get going on checking off everything on your Union must-do list.

How much are flights to Union?

Got very cheap flights on your vacation itinerary? When you book your airline tickets to Union on Hotwire, you may just get what’s on your getaway wish list. With tickets as low as $47, you’ll have leftover cash for at least a magazine and a bottle of water at the airport book store.

How to get cheap flights to Union?

The trick to saving a stack of cash on your flight to Union? Snatch up that Hotwire flight deal when you see a killer rate because it could be gone in a flash. And with flights as low as $47 right now, why wait?

Union Flight Information
Destination airport
Lambert-St. Louis Intl.
Destination airport IATA code
STL
Roundtrip price
$47

Last Minute Hotel Deals in Union

Super 8 by Wyndham Union

Super 8 by Wyndham Union

2 out of 5
1015 East Main Street Union MO
Book a stay at this business-friendly hotel in Union. Enjoy free breakfast, free WiFi, and free parking. Our guests praise the helpful staff and the clean rooms ...
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Super 8 by Wyndham Union
The Wildwood Hotel

The Wildwood Hotel

3.5 out of 5
2801 Fountain Pl Wildwood MO
Book a stay at this business-friendly hotel in Wildwood. Enjoy free breakfast, free WiFi, and free parking. Our guests praise the helpful staff and the convenient ...
9.2/10 Wonderful! (1,680 reviews)
"The room was very clean and nice! The staff were extremely friendly as well, and made our stay very easy ! The hotel is conveniently located near many places including only being a few steps away from the movie theater. The rooms stayed very quiet in comparison to other hotels Also they have snacks ..."

Reviewed on Oct 30, 2026

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The Wildwood Hotel
Pinemark Inn & Suites

Pinemark Inn & Suites

2 out of 5
866 South Outer Road St. Clair MO
Stay at this hotel in St. Clair. Enjoy free breakfast, free WiFi, and free parking. Our guests praise the breakfast and the pool in our reviews. Popular attractions ...
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Pinemark Inn & Suites
Comfort Inn Near Six Flags St. Louis

Comfort Inn Near Six Flags St. Louis

2.5 out of 5
1320 Thornton St Pacific MO
Book a stay at this business-friendly hotel in Pacific. Enjoy free breakfast, free WiFi, and free parking. Our guests praise the helpful staff and the clean ...
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Comfort Inn Near Six Flags St. Louis
Comfort Inn Sullivan

Comfort Inn Sullivan

2.5 out of 5
736 S Service Rd W Sullivan MO
Book a stay at this business-friendly hotel in Sullivan. Enjoy free breakfast, free WiFi, and free parking. Our guests praise the helpful staff in our reviews. ...
8.6/10 Excellent! (955 reviews)
"Hotel was clean and staff was very friendly and welcoming."

Reviewed on Nov 1, 2026

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Comfort Inn Sullivan
Holiday Inn St. Louis West Six Flags by IHG

Holiday Inn St. Louis West Six Flags by IHG

3 out of 5
4901 Six Flags Rd Eureka MO
Book a stay at this family-friendly hotel in Eureka. Enjoy free WiFi, free parking, and breakfast (surcharge). Our guests praise the pool and the restaurant ...
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Holiday Inn St. Louis West Six Flags by IHG
Super 8 by Wyndham Eureka/Six Flags Nearby

Super 8 by Wyndham Eureka/Six Flags Nearby

2 out of 5
1733 W 5th St Eureka MO
Stay at this hotel in Eureka. Enjoy free breakfast, free WiFi, and free parking. Our guests praise the helpful staff and the clean rooms in our reviews. Popular ...
7/10 Good! (1,000 reviews)
"The room had so many bugs it was disgusting. Asked the staff to switch rooms and they didn’t have anything else that was what we had booked so I got some cleaning spray and tried to clean the room a bit but the bugs just kept coming so we ended up checking out at 11pm after only being there for a ..."

Reviewed on Oct 29, 2026

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Super 8 by Wyndham Eureka/Six Flags Nearby
Best Western Plus Washington Hotel

Best Western Plus Washington Hotel

2.5 out of 5
2621 E 5th St Washington MO
Book a stay at this business-friendly hotel in Washington. Enjoy free breakfast, free WiFi, and free parking. Our guests praise the breakfast and the helpful ...
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Best Western Plus Washington Hotel
See all 405 properties in Union
Lowest nightly price found within the past 24 hours based on a 1 night stay for 2 adults. Prices and availability subject to change. Additional terms may apply.