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Union

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Union Flights as Low as $75

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

Frontier Airlines
Thu, Nov 19 - Fri, Dec 4
ATL
Hartsfield-Jackson Atlanta Intl.
STL
Lambert-St. Louis Intl.
$75 Roundtrip, just found
$75
Roundtrip
just found
Select Frontier Airlines flight, departing Thu, Nov 19 from Hartsfield-Jackson Atlanta Intl. to Lambert-St. Louis Intl., returning Fri, Dec 4, priced at $75 just found
Frontier Airlines
Wed, Dec 2 - Mon, Dec 14
DEN
Denver Intl.
STL
Lambert-St. Louis Intl.
$80 Roundtrip, just found
$80
Roundtrip
just found
Select Frontier Airlines flight, departing Wed, Dec 2 from Denver Intl. to Lambert-St. Louis Intl., returning Mon, Dec 14, priced at $80 just found
Frontier Airlines
Sat, Dec 5 - Fri, Dec 11
DEN
Denver Intl.
STL
Lambert-St. Louis Intl.
$84 Roundtrip, found 3 days ago
$84
Roundtrip
found 3 days ago
Select Frontier Airlines flight, departing Sat, Dec 5 from Denver Intl. to Lambert-St. Louis Intl., returning Fri, Dec 11, priced at $84 found 3 days ago
Frontier Airlines
Wed, Dec 2 - Fri, Dec 11
DEN
Denver Intl.
STL
Lambert-St. Louis Intl.
$90 Roundtrip, found 3 days ago
$90
Roundtrip
found 3 days ago
Select Frontier Airlines flight, departing Wed, Dec 2 from Denver Intl. to Lambert-St. Louis Intl., returning Fri, Dec 11, priced at $90 found 3 days ago
Frontier Airlines
Wed, Nov 18 - Wed, Dec 2
TPA
Tampa Intl.
STL
Lambert-St. Louis Intl.
$141 Roundtrip, found 17 hours ago
$141
Roundtrip
found 17 hours ago
Select Frontier Airlines flight, departing Wed, Nov 18 from Tampa Intl. to Lambert-St. Louis Intl., returning Wed, Dec 2, priced at $141 found 17 hours ago
Frontier Airlines
Sat, Nov 7 - Wed, Nov 18
DFW
Dallas-Fort Worth Intl.
STL
Lambert-St. Louis Intl.
$141 Roundtrip, found 2 days ago
$141
Roundtrip
found 2 days ago
Select Frontier Airlines flight, departing Sat, Nov 7 from Dallas-Fort Worth Intl. to Lambert-St. Louis Intl., returning Wed, Nov 18, priced at $141 found 2 days ago
Delta
Fri, Jan 22 - Fri, Jan 22
ORD
O'Hare Intl.
STL
Lambert-St. Louis Intl.
$211 Roundtrip, found 1 day ago
$211
Roundtrip
found 1 day ago
Select Delta flight, departing Fri, Jan 22 from O'Hare Intl. to Lambert-St. Louis Intl., returning Fri, Jan 22, priced at $211 found 1 day ago
American Airlines
Sat, Nov 7 - Wed, Nov 18
DFW
Dallas-Fort Worth Intl.
STL
Lambert-St. Louis Intl.
$228 Roundtrip, found 2 days ago
$228
Roundtrip
found 2 days ago
Select American Airlines flight, departing Sat, Nov 7 from Dallas-Fort Worth Intl. to Lambert-St. Louis Intl., returning Wed, Nov 18, priced at $228 found 2 days ago
Southwest Airlines
Fri, Dec 4 - Fri, Dec 4
ATL
Hartsfield-Jackson Atlanta Intl.
STL
Lambert-St. Louis Intl.
$237 Roundtrip, just found
$237
Roundtrip
just found
Select Southwest Airlines flight, departing Fri, Dec 4 from Hartsfield-Jackson Atlanta Intl. to Lambert-St. Louis Intl., returning Fri, Dec 4, priced at $237 just found
Frontier Airlines
Mon, Nov 16 - Wed, Nov 18
LAX
Los Angeles Intl.
STL
Lambert-St. Louis Intl.
$243 Roundtrip, found 2 days ago
$243
Roundtrip
found 2 days ago
Select Frontier Airlines flight, departing Mon, Nov 16 from Los Angeles Intl. to Lambert-St. Louis Intl., returning Wed, Nov 18, priced at $243 found 2 days ago
United
Fri, Jan 22 - Sun, Jan 24
ORD
O'Hare Intl.
STL
Lambert-St. Louis Intl.
$245 Roundtrip, found 1 day ago
$245
Roundtrip
found 1 day ago
Select United flight, departing Fri, Jan 22 from O'Hare Intl. to Lambert-St. Louis Intl., returning Sun, Jan 24, priced at $245 found 1 day ago
Bargain Flight
Wed, Nov 11 - Sat, Nov 14
DCA
Ronald Reagan Washington National
STL
Lambert-St. Louis Intl.
$274 Roundtrip, found 5 hours ago
$274
Roundtrip
found 5 hours ago
Select Bargain Flight flight, departing Wed, Nov 11 from Ronald Reagan Washington National to Lambert-St. Louis Intl., returning Sat, Nov 14, priced at $274 found 5 hours ago
Frontier Airlines
Sat, Nov 14 - Wed, Nov 18
ONT
Ontario Intl. Airport
STL
Lambert-St. Louis Intl.
$280 Roundtrip, found 3 hours ago
$280
Roundtrip
found 3 hours ago
Select Frontier Airlines flight, departing Sat, Nov 14 from Ontario Intl. Airport to Lambert-St. Louis Intl., returning Wed, Nov 18, priced at $280 found 3 hours ago
Frontier Airlines
Sat, Nov 14 - Mon, Nov 23
SFO
San Francisco Intl.
STL
Lambert-St. Louis Intl.
$288 Roundtrip, found 10 hours ago
$288
Roundtrip
found 10 hours ago
Select Frontier Airlines flight, departing Sat, Nov 14 from San Francisco Intl. to Lambert-St. Louis Intl., returning Mon, Nov 23, priced at $288 found 10 hours ago
Southwest Airlines
Wed, Nov 4 - Wed, Nov 18
DAL
Love Field
STL
Lambert-St. Louis Intl.
$319 Roundtrip, found 1 day ago
$319
Roundtrip
found 1 day ago
Select Southwest Airlines flight, departing Wed, Nov 4 from Love Field to Lambert-St. Louis Intl., returning Wed, Nov 18, priced at $319 found 1 day ago
Alaska Airlines
Wed, Oct 28 - Tue, Nov 17
ONT
Ontario Intl. Airport
STL
Lambert-St. Louis Intl.
$513 Roundtrip, found 13 hours ago
$513
Roundtrip
found 13 hours ago
Select Alaska Airlines flight, departing Wed, Oct 28 from Ontario Intl. Airport to Lambert-St. Louis Intl., returning Tue, Nov 17, priced at $513 found 13 hours ago

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 November, 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 $75, 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 $75 right now, why wait?

Union Flight Information
Destination airport
Lambert-St. Louis Intl.
Destination airport IATA code
STL
Roundtrip price
$75

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 ...
8.2/10 Very Good! (693 reviews)
"The check in was great she saw I had 2 kids changed our room across from the pool. The next day the kids wanted to go swimming before we checked out. Pool didn’t open until ten they opened up early for us we definitely will be going back again soon"

Reviewed on Oct 12, 2026

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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 ...
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The Wildwood Hotel
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 ...
8.4/10 Very Good! (1,000 reviews)
"Toilet was not clean upon entering room. Language barrier at front desk"

Reviewed on Oct 17, 2026

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Comfort Inn Near Six Flags St. Louis
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 ...
9.6/10 Exceptional! (1,002 reviews)
"We had a great experience here with incredible amenities, beautiful views of the sunset, great selection for breakfast, and a friendly welcoming staff. Would definitely stay here again next time we are in the area."

Reviewed on Oct 17, 2026

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Pinemark Inn & Suites
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. ...
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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 ...
9/10 Wonderful! (1,000 reviews)
"Ive been coming for 20 years and I am over the rules and regulations that are unkindly and unreasonably enforced every single year. The amenities were great when we had small children. Now, however, its just not worth it. I hate the curfew. The restaurant has consistently gone downhill. I think the ..."

Reviewed on Oct 12, 2026

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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! (1,001 reviews)
"ADA room was not really accessible. Bed was so high that I had trouble getting into it, and I'm 5' 10 and not handicapped. It was very hard to get my husband into. Someone in a wheelchair would never be able to get in. It was 33 inches tall, six to eight inches higher than the accessible beds at ..."

Reviewed on Oct 17, 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 402 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.