$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, $52 Round Trip from Seattle to Thornton
Prices starting at $52 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
Gold Point Resort Breckenridge by Vacatia
Mar 7 - Mar 11
Seattle (SEA) to Denver (DEN)
Reviewed on Sep 5, 2023
Hyatt Vacation Club at The Ranahan
Mar 7 - Mar 11
Seattle (SEA) to Denver (DEN)
Reviewed on Jan 15, 2026
Village at Breckenridge Resort
Mar 7 - Mar 11
Seattle (SEA) to Denver (DEN)
Reviewed on Jun 28, 2024
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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Find Low Prices in One Place
Booking a trip from Seattle to Thornton 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 Thornton to your flight or hotel reservation to keep the kids happy and active.
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Use our mobile app for your iPhone, iPad, or Android phone—or our mobile website m.orbitz.com—to find bargains on flights from Seattle to Thornton wherever you are. Book your cheap Seattle to Thornton flights and a hotel room too—even at the last minute. Orbitz also makes your life easier with free alerts that are sent to your mobile phone or email about delays to your upcoming flights from Seattle to Thornton.
Don’t Miss out on Miles
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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.