$28 Cheap flight deals from Denver (DEN) to Union (STL)
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This Weekend's Flight Deals from Denver to Union
This weekend's flight prices found within the past 7 days, for the period specified. Prices and availability are subject to change. Additional terms apply.
Airfares from $28 One Way, $56 Round Trip from Denver to Union
Prices starting at $56 for return flights and $28 for one-way flights to Union were the cheapest prices found within the past 7 days, for the period specified. Prices and availability are subject to change. Additional terms apply.
Union economy flight packages
Sonesta ES Suites St. Louis - Chesterfield
Apr 10 - Apr 13
Denver (DEN) to St. Louis (STL)
Reviewed on Oct 5, 2025
The Knight Center at Washington University
Apr 10 - Apr 13
Denver (DEN) to St. Louis (STL)
Reviewed on Sep 15, 2025
The Cheshire
Apr 10 - Apr 13
Denver (DEN) to St. Louis (STL)
Reviewed on Sep 2, 2025
More About Flying To Union from Denver
Route Information for Flights from Denver to Union
Origin Airport IATA Code | DEN |
|---|---|
Destination Airport IATA Code | STL |
Distance | |
Direct Flight Airlines | |
Earliest Flight Arrival | |
Latest Flight Arrival |
Denver to Union
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Booking a trip from Denver to Union has never been easier. Not only will you find great deals on flights, we offer bargains on cruises, car rentals, top-notch hotels, and more. You can also research and add local activities in Union to your flight or hotel reservation to keep the kids happy and active.
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Don’t Miss out on Miles
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Flights from Denver
- Denver to Chicago
- Denver to Los Angeles
- Denver to New York
- Denver to Orlando
- Denver to Atlanta
- Denver to Kansas City
- Denver to London
- Denver to Montreal
- Denver to San Francisco
- Denver to Toronto
- Denver to Edmonton
- Denver to Killeen
- Denver to Santa Ana
- Denver to Austin
- Denver to Beijing
- Denver to Buenos Aires
- Denver to Charlotte
- Denver to Dallas
- Denver to Detroit
- Denver to Houston
Union Airports
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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.