$34 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 $34 One Way, $56 Round Trip from Denver to Union
Prices starting at $56 for return flights and $34 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
Heritage Inn & Suites St. Louis/Fenton, Trademark by Wyndham
May 22 - May 25
Denver (DEN) to St. Louis (STL)
St. Louis (STL) to Denver (DEN)
Reviewed on Mar 23, 2026
The Wildwood Hotel
May 22 - May 25
Denver (DEN) to St. Louis (STL)
St. Louis (STL) to Denver (DEN)
Reviewed on Oct 16, 2025
Clayton Plaza Hotel & Extended Stay
May 22 - May 25
Denver (DEN) to St. Louis (STL)
St. Louis (STL) to Denver (DEN)
Reviewed on Feb 14, 2026
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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Take advantage of low fares on Denver to Union flights and vacation packages
Orbitz has the best prices available on flights from Denver to Union. Take advantage of our low fare sales and discounts and begin to plan your next trip. We also give you great savings on hotels, car rentals, and vacation packages.
Flights from Denver
- Denver to Chicago
- Denver to Los Angeles
- Denver to Orlando
- Denver to New York
- Denver to Houston
- Denver to Dallas
- Denver to Miami
- Denver to London
- Denver to Minneapolis - St. Paul
- Denver to Atlanta
- Denver to Austin
- Denver to Toronto
- Denver to San Francisco
- Denver to Kansas City
- Denver to Detroit
- Denver to Charlotte
- Denver to Montreal
- Denver to Santa Ana
- Denver to Edmonton
- Denver to Buenos Aires
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.