Cheap flights from Denver to Seattle from $43
This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Denver to Seattle departing on 9/2. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Frontier flights from Denver to Seattle
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How to get the cheapest flight ticket from Denver to Seattle
Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip
What is the typical price of a round-trip flight between Denver and Seattle?
What is the cheapest month to fly to Seattle?
In general, October is the cheapest month to fly from Denver to Seattle. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $167. If you don’t want to visit Seattle in October, then you should wait until September to fly from Denver, when ticket prices are also cheap, with an average price of $171.
What is the cheapest day to depart on your flight to Seattle?
On average, the least expensive day to fly to Seattle from Denver is on a Friday. momondo users have found tickets for Friday departures for as low as $284. However, this price may fluctuate depending on the airline, the season, and holidays. On the other hand, Sunday is the most expensive day to depart from Denver because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $434.
What is the cheapest time of day to depart on your flight to Seattle?
Flying to Seattle from Denver in the afternoon is the least expensive time of day to depart. momondo users have found prices as low as $258 when looking at flights departing in the afternoon. Flights to Seattle are more costly in the morning, with an average ticket price of $367. Departure times in the morning fall within the peak daily travel times, which is why tickets can be more expensive.
What is the cheapest Denver Intl to Seattle/Tacoma Intl flight route?
Fly from Denver Intl to Seattle/Tacoma Intl for the best Denver Intl - Seattle/Tacoma Intl flight prices
How far in advance should I book a flight to Seattle?
You are more likely to see cheaper flights to Seattle from Denver when booking weeks ahead of your departure date. In general, you can expect to find flights to Seattle for around $205 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Seattle from Denver for as low as $180 on momondo.
What cabin class options are available on Denver Intl to Seattle/Tacoma Intl flights?
There are 4 cabin classes available to choose from on Denver Intl to Seattle/Tacoma Intl flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.
What is the cheapest airline that flies from Denver Intl to Seattle/Tacoma Intl?
Frontier, Hawaiian Airlines, and Delta are the most popular carriers operating from Denver Intl to Seattle/Tacoma Intl
What airlines fly to Seattle?
Frontier, Alaska Airlines and Delta are the top three most popular airlines that fly to Seattle from Denver according to our data. Frontier is the first choice among our users, with 40% of people opting to fly with this airline when traveling to Seattle. Keep in mind that there are 7 different airlines that fly to Seattle on a routine basis, so you have a few additional options to choose from.
How many flights depart from Denver to Seattle on average per day?
36 flights are operational daily from Denver to Seattle as of July 2025. The most popular departure time for this route is 6:00AM, with 48% of flights per day taking off at noon.
How many flights depart from Denver to Seattle on average per week?
258 flights are operational weekly from Denver to Seattle as of July 2025. The most popular departure day for this route is Thu, with 23% of flights per week taking off on this day.
When to book flights from Denver to Seattle
Cheap Denver to Seattle (DEN to SEA) flight deals and tips
Find info about flight duration, direct flights, and airports for your flight from Denver to Seattle
How far is Denver Intl to Seattle/Tacoma Intl by plane?
A flight from Denver Intl to Seattle/Tacoma Intl will travel around 1019.6 mi. 3h 01m is a normal flight duration for this route.
When did momondo last update prices for flights from Denver Intl Airport to Seattle/Tacoma Intl Airport?
Prices for flights from Denver Intl Airport to Seattle/Tacoma Intl Airport were last updated today.
How many operators does momondo search for flights from Denver Intl Airport to Seattle/Tacoma Intl Airport?
As of July 2025, there are 6 operators available to choose from for flights from Denver Intl Airport to Seattle/Tacoma Intl Airport.
How old do you have to be to fly from Denver Intl Airport to Seattle/Tacoma Intl Airport?
The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Denver Intl Airport to Seattle/Tacoma Intl Airport.
What documentation or ID do you need to fly to Seattle/Tacoma Intl Airport?
The required travel and health documents for your Seattle/Tacoma Intl Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Seattle/Tacoma Intl Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.
What is the most popular plane model from Denver to Seattle?
momondo data reveals that the most frequently booked plane model on the route from Denver to Seattle is Boeing 737-800, representing 12.39% of all bookings. The subsequent popular models are Boeing 737-800 Passenger/BBJ2 (winglets) at 11.84%, Boeing 737-900 Passenger/BBJ3 (winglets) at 11.34%, and Boeing 737 MAX 9 at 10.16%.
What is the most popular airline from Denver to Seattle?
Based on momondo bookings for this flight route, the most popular airline on flight routes from Denver to Seattle is Frontier (38% of total bookings). The next most popular airlines are Alaska Airlines (22%), Delta (21%), and United Airlines (12%).
Best airlines flying from Denver to Seattle
Compare and see reviews for airlines that fly from Denver to Seattle with momondo
| Airline | Rating | Free Cancellation | Price | ||
|---|---|---|---|---|---|
| PriceFrom $58 | Free Cancellation | Rating 5.9 3,286 reviews | |||
| PriceFrom $109 | Free Cancellation | Rating 8.0 7,982 reviews | |||
| PriceFrom $115 | Free Cancellation | Rating 7.8 2,545 reviews | |||
| PriceFrom $135 | Free Cancellation | Rating 8.0 4,266 reviews | |||
| PriceFrom $148 | Free Cancellation | Rating 7.4 8,861 reviews | |||
| PriceFrom $159 | Free Cancellation | Rating 8.0 10,000 reviews |
Delta Flights From Denver to Seattle
Delta operates around 11 flights from Denver to Seattle every week. The average price of these flights found in the last 72 hours has been $236, but momondo users have found Delta deals from Denver to Seattle from as low as $109 round-trip. Delta has been scored 8.0/10 in 7,982 reviews.
Southwest Flights From Denver to Seattle
The best Southwest deal for Denver to Seattle flight tickets found on momondo in the last 72 hours was $135, round-trip. It should be noted that an average Southwest flight deal for this route in this time was higher, at $234 round-trip. Southwest operates 22 flights out of Denver into Seattle in an average week, so prices vary by time and availability. 4,266 Southwest reviews by users on momondo have scored the airline at 8.0/10.
Traveling to a place near Seattle?
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Why should I use momondo to find a flight deal from Denver to Seattle?
We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Denver to Seattle for you.
Can I find flights from Denver to Seattle with flexible booking policies on momondo?
Flights from Denver to Seattle with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.
How can momondo help me find flights from Denver to Seattle?
momondo provides multiple filters to help you find the best flight to Seattle from Denver. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.
I’m not ready to book a flight from Denver to Seattle right now. Can momondo alert me if prices change?
Yes momondo offers price alerts on flights to Seattle from Denver. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.