Book Cheap United flight from Denver (DEN) to Seattle (SEA) from CA $287

Find The Best Day to Book a Cheap United Flights From Denver to Seattle

Cheapest United Flights from Denver (DEN) to Seattle (SEA)

The cheapest flights to Seattle - Tacoma Intl. found within the past 7 days were round trip and CA $287 one way. Prices and availability subject to change. Additional terms may apply.

Frequently asked questions

Can I catch a flight from Denver Airport to Sea-Tac Airport right now?
For info on any current Seattle - Tacoma Intl. Airport (SEA) travel advice and quarantine requirements, visit our Covid-19 Travel Advisor. Look before you book your flight, so you don't get caught up en route.
What terminal is United Airlines at Denver Airport?
Flights usually take off from the main terminal at Denver Intl. Airport (DEN) if you've booked a seat with United Airlines. Landing at Seattle - Tacoma Intl. Airport (SEA)? Touch base with your airline (or do some online research) to find out which terminal you'll be exiting the plane at.
Are there United Airlines non-stop flights from DEN to SEA?
In short, yes. Lock in a nonstop flight with United Airlines from Denver Intl. Airport (DEN) to Sea-Tac Airport, and you won't have to worry about stopovers or catching a connecting flight.
How long is a United Airlines flight from DEN to SEA?
Bring that book on board you haven't had time to read. A flight from Denver Airport to SEA with United Airlines takes roughly 4 hours and 10 minutes. You'll have enough time to immerse yourself in the gripping storyline.
What type of aircraft does United Airlines fly from DEN to SEA?
When you take to the skies between DEN and SEA with United Airlines, you'll usually be doing it aboard the Boeing 737-800. The airline also operates the Airbus A319 on this flight path.
How many direct and indirect flights does United Airlines fly from DEN to SEA?
You'll have lots of choice if you'd prefer to fly with United Airlines from DEN to SEA. Currently, it offers about 5 flights each day.
If I am not able to travel due to COVID-19, can I change my booking to a later date?
For more info about changing your flight to SEA, please visit our Customer Service Portal.
What is the best day to buy a plane ticket?
This just in! Airfares offered on Thursdays tend to be the cheapest, according to flight demand on Travelocity in 2021. Tuesday and Wednesday prices are also good, but you may want to prepare your budget if booking during the weekend, as data shows that is when prices are generally at their highest.
What are the cheapest days to fly?
Frequent travelers may already know this, but earlier in the week can be the cheapest time to fly. In 2021, flights departing on a Monday were generally the cheapest of the week, whereas you may pay a premium for weekend flights when demand is usually high. On average, tickets were most expensive for Saturday departures, so if you need to fly out on a weekend, you might look for deals ahead of time.
How far in advance can you book a flight?
Trying to figure out how early you should book your flight? It's possible to start comparing international airfares on Travelocity up to 12 months in advance. However, it does depend on the carrier as not all airlines release their prices that far out. According to our 2021 flight demand trends, last minute planners can still bag a bargain with some of the cheapest fares appearing 0-2 weeks prior to their travel dates.*According to flight demand on Travelocity.com from January to December 2021. Savings are subject to change based on departure location, date and destination.

Grab a great United flight from DEN to SEA 

To find a great deal on United flights with Travelocity, simply enter your origin and destination airports, pick your travel dates, and hit search. From here, you can sort by price, flight duration, and arrival/departure time. You can also filter to find nonstop flights. 

Flying United Denver to Seattle gives you fights to choose from. With that direct flight time of , you’ll be touching down before you know it.  

 

Find cheap flights with United between Denver and Seattle 

United has a range of great fares on stacks of flights, and to find the most affordable for you, there are a few tricks you can try. Booking in advance, for example, is a great way to grab a fantastic deal. Also, choose the cheapest month, if you can. One-way flights from Denver to Seattle with United are November.  

The more flexible you are, the more affordable flights you’re likely to find. Consider one-way flights and connecting flights, as well as standard roundtrip and direct options. Even if you’re flying today, cheap last-minute flights are easy to find by entering your travel dates and hitting search.  

 

Reasons to book your United flights with Travelocity 

Travelocity makes it easy to book a seat, anywhere in the world. The vast inventory, fast search, and advanced filters put some of the best deals on the planet in one place. Whether you’re traveling on business, with friends, family, or on your own, take your pick from some fantastic options. And with free cancellation and pay later options, you can travel more and worry less.  

United Airports
Hop on a(n) United flight today by flying to many destinations out of these domestic and international airports:
Airport code
Country
Airport name
Number of flights
ORDUSAO'Hare Intl.227
DENUSADenver Intl.226
IAHUSAGeorge Bush Intercontinental136
IADUSAWashington Dulles Intl.100
SFOUSASan Francisco Intl.64
LAXUSALos Angeles Intl.23
EWRUSALiberty Intl.20
FRADEUFrankfurt Intl.19
NRTJPNNarita Intl.19
PEKCHNCapital Intl.16

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Country Inn & Suites by Radisson, Seattle-Tacoma International Airport, WA

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Stay at this 3-star business-friendly hotel in SeaTac. Enjoy free breakfast, free WiFi, and free parking. Our guests praise the breakfast and the helpful staff ...
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This hotel was absolutely amazing. I’m not sure why others wrote bad reviews, the rooms are clean, bathroom clean, the whole hotel was super clean, front desk staff was quick, attentive, polite, knowledgeable. Our shuttle to airport was not only on time, but early, and very communicative. The only ...

Reviewed on Oct 25, 2025

Country Inn & Suites by Radisson, Seattle-Tacoma International Airport, WA
Lowest nightly price found within the past 24 hours based on a 1 night stay for 2 adults. Prices and availability subject to change. Additional terms may apply.
*Price based on the lowest price found within past 24 hours and based upon one night stay for two adults over the next thirty days. Prices and availability subject to change. Additional terms may apply.