$29 Cheap flight deals from Seattle (SEA) to Thornton (DEN)
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This Weekend's Flight Deals from Seattle to Thornton
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 $29 One Way, $57 Round Trip from Seattle to Thornton
Prices starting at $57 for return flights and $29 for one-way flights to Thornton were the cheapest prices found within the past 7 days, for the period specified. Prices and availability are subject to change. Additional terms apply.
Thornton economy flight packages
Hyatt Regency Denver at Colorado Convention Center
Feb 13 - Feb 16
Seattle (SEA) to Denver (DEN)
Reviewed on Jul 25, 2025
The Brown Palace Hotel and Spa, Autograph Collection
Jan 23 - Jan 27
Seattle (SEA) to Denver (DEN)
Denver (DEN) to Seattle (SEA)
Reviewed on Nov 11, 2025
The Maven Hotel at Dairy Block
Feb 13 - Feb 16
Seattle (SEA) to Denver (DEN)
Reviewed on Nov 29, 2025
Thornton first class flight packages
Aspen Hideaway by Avantstay Walk to Aspen, Near Slopes + Pool & Hot Tub Access
Jan 20 - Jan 25
Seattle (SEA) to Denver (DEN)
The Gant
Jan 20 - Jan 25
Seattle (SEA) to Denver (DEN)
Reviewed on Oct 6, 2024
Aspen Meadows Resort
Jan 20 - Jan 25
Seattle (SEA) to Denver (DEN)
Reviewed on Jul 6, 2023
More About Flying To Thornton from Seattle
Route Information for Flights from Seattle to Thornton
Origin Airport IATA Code | SEA |
|---|---|
Destination Airport IATA Code | DEN |
Distance | |
Direct Flight Airlines | |
Earliest Flight Arrival | |
Latest Flight Arrival |
Seattle to Thornton
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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.