Cheap Flights from Denver (DEN) to Seattle (SEA)

You can find cheap one-way flights from AU$170 and cheap return flights AU$408 DEN to SEA with Expedia. One-way flights typically cost between AU$201 and AU$958 and return flights often range between AU$817 and AU$1,841. Flight prices vary based on the month and day of the week you want to travel, as well as the airline and how far in advance you book your ticket. Filter your search on Expedia by "Price (lowest to highest)" to see the cheapest fares first, and use the Price Tracking tool to receive alerts when DEN to SEA ticket fares go up or down.

The cheapest months to fly from Denver, CO (DEN) to Seattle, WA (SEA) are typically during off-peak season when demand is low. Traveling in off-peak or shoulder months is usually a good way to secure cheap tickets, just remember to avoid flying during holidays if you are able to. Use the calendar view in your search to see which months have low fares on this route.

There are 7 airlines offering direct flights from Denver, CO (DEN-Denver Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.). Here are some of the top carriers:
* United operates 55 direct flights from Denver, CO (DEN-Denver Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.) every week.
* Southwest Airlines operates 32 direct flights from Denver, CO (DEN-Denver Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.) every week.
* Delta operates 27 direct flights from Denver, CO (DEN-Denver Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.) every week.
* Qatar Airways operates 16 direct flights from Denver, CO (DEN-Denver Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.) every week.
* Frontier Airlines operates 13 direct flights from Denver, CO (DEN-Denver Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.) every week.

To find a cheap flight from Denver, CO (DEN) to Seattle, WA (SEA), be flexible with your dates. Traveling outside of peak vacation months and booking a mid-week flight can help you save. Early morning and late night flights are often more affordable, too. Expedia allows you to compare flight times, airlines and routes all in one place to find low fares. You can also set up Price Tracking and receive alerts when fares go up or down.

The best airline to fly with from Denver, CO (DEN-Denver Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.) will differ from traveler to traveler. If you like to fly early, Delta offers early morning flights. If price is the most important factor, Frontier Airlines typically offers the lowest fares. Southwest Airlines offers the most daily flights from Denver, CO (DEN-Denver Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.), which is great if flexibility is what you value most. The best carrier for this journey could also be the one you have a loyalty membership with, as flying with that airline or another airline within the same alliance could help you collect points or enjoy lounge access.

The best time to fly is usually mid-week (Tuesday or Wednesday) and during early morning hours as flights tend to be cheaper, less crowded, and generally more on-time. Avoid major holidays and peak vacation seasons for smoother travel. Combining off-peak days and hours often gives the best combination of cost, comfort, and convenience.

You'll find around 18 nonstop flights per day from Denver International (DEN) to Seattle-Tacoma International (SEA). For even more choices, look at flights that include layovers, as there are approximately 193 connecting flights per day. Some common connection points include Sky Harbor International (PHX), Harry Reid International Airport (LAS), and Los Angeles International (LAX).

The earliest flight from Denver International Airport (DEN) to Seattle - Tacoma International Airport (SEA) typically departs around 12:20 AM local time, operated by Delta. This is a seasonal service, active only in December. An early departure like this can help you make the most of your time at your destination. To compare early flights on Expedia, select the "Early Morning" and "Morning" filters in your search.

You'll find the most flights from Denver Intl. (DEN) to Seattle - Tacoma Intl. (SEA) on Fridays, with around 121 flights available. This gives you plenty of options for your travel plans. Major airlines on this route include Southwest Airlines, United, and Alaska Airlines. Flight schedules are fairly consistent throughout the week, with Fridays having slightly more options compared to other days.

The most popular departure times for flights from Denver, CO (DEN-Denver Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.) are in the early morning, from 6am to 9am. Many major carriers, including Alaska Airlines, Frontier Airlines and Southwest Airlines, offer flights during this window. Many travellers prefer these times because it allows for an early arrival in Seattle, giving you more time to enjoy your day.

A non-stop flight from Denver, CO (DEN-Denver Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.) typically takes around 3 hours. This route covers a distance of approximately 1,645 kilometers. If you opt for a flight with one stop, your travel time will be longer, usually around 8 hours 30 minutes. Flights with two or more stops generally take about 9 hours. Keep in mind that actual flight times can vary due to factors like wind patterns and air traffic, so it's always a good idea to allow for some flexibility in your travel plans.

You can fly business class or first class between DEN and SEA. Airlines that offer business class service on this route include:

* Frontier Airlines
* Alaska Airlines
* Delta

First class cabins are available on:

* Alaska Airlines
* Delta
* United
* American Airlines

It's easy to earn miles on a Denver, CO (DEN) to Seattle, WA (SEA) flight when you book with Expedia. Before you confirm your booking, simply select your frequent flyer program and enter your program number. As a member of One Key™, you can also earn OneKeyCash™* on top of your airline miles when you book with Expedia.

*Excludes taxes and fees. OneKeyCash is not redeemable for cash and can only be used on Expedia and other participating brands.

From Denver Intl. (DEN), you can fly directly into Seattle - Tacoma Intl. (SEA) in Seattle. Some flights may connect through major hubs like San Diego Intl. (SAN), Seattle - Tacoma Intl. (SEA), or Portland Intl. (PDX) before reaching Seattle. Compare routes and airports on Expedia to find the best flight options for your travel plans.

Typically, booking a last minute flight from Denver, CO (DEN) to Seattle, WA (SEA) will be more expensive than booking in advance. As the departure date approaches, there are usually fewer seats available which can drive up the cost. However, if there's some wiggle room with your travel dates and times, you could bag a cheap last-minute fare.

Securing a Denver, CO (DEN) to Seattle, WA (SEA) flight and hotel package is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Select from our extensive range of stays and then add flights, activities and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.

If you booked your Denver, CO (DEN) to Seattle, WA (SEA) flight within the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of ticket you have, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you'd like more information.