Find cheap flights from Denver to Seattle

DEN - SEA

Find cheap flights from Denver to Seattle

Round-trip
Economy
Denver (DEN)
Seattle/Tacoma Intl
Fri 3/5
Fri 3/12
Any month
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Good to know

Low season

JanuaryBest time to beat the crowds with an average 25% drop in price.

High season

DecemberMost popular time to fly with an average 14% increase in price.

Average price round-trip

$148(avg. price over the last 2 weeks)

Good deal round-trip

$131or less

Good deal one-way

$83or less

When to book flights from Denver to Seattle

Estimated round-trip price
Average price per month
Flight prices as travel date approaches

Top tips for finding a cheap flight

  • Looking for a cheap flight? 25% of our users found flights on this route for $83 or less one-way and $131 or less round-trip.
  • The cheapest flight from Denver to Seattle was found 17 days before departure, on average.
  • Book at least 1 week before departure in order to get a below-average price.
  • High season is considered to be November, December and January. The cheapest month to fly is January.
  • Morning departure is around 18% cheaper than an evening flight, on average*.
  • Both United and Delta Airlines offer flights from Denver to Seattle that provide travelers with comfortable seats and additional legroom, as well as in-flight entertainment. If you would like to check your suitcases for free and receive complimentary snacks, opt for flying with Southwest Airlines instead.
  • If you’re traveling to Seattle for an important meeting or workshop, stop by the business center that is near the B Gates of Denver International Airport (DEN). This center provides guests with private workstations, copying services, shipping supplies, and access to the airport’s high-speed Wi-Fi.
  • To pass the time before your flight from Denver to Seattle begins boarding, go to the ZooX Public Internet Kiosk Systems in the Jeppesen Terminal of Denver International Airport. These booths allow travelers to play video games for $0.15 per minute, with a minimum payment of $3.
  • Hoping to leave one of your bags at the airport while you explore? Go to the Smarte Carte Baggage Storage desk between baggage carousels 12 and 13 of Seattle-Tacoma International Airport (SEA). In addition to offering baggage storage for $8 to $22 per item per 24h, this center also has notary and fax services.
  • To de-stress after a long day of travel, stop by the Massage Bar near the N gates of Seattle-Tacoma International Airport. 15m massages start at $18, with 30m massages costing $43. You can also have an express foot massage for less than $20.
*Average of the lowest prices shown in KAYAK’s search results for departures within the next 30 days

FAQs for booking flights from Denver to Seattle

Which airlines have a flexible cancellation policy for flights from Denver to Seattle due to COVID-19?

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Does Denver International Airport offer any amenities for pets or service animals?

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Are there any shower facilities at Seattle-Tacoma International Airport?

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Top 3 airlines serving Denver Intl to Seattle/Tacoma Intl

Scores according to KAYAK customer reviews

7.9
Delta
Overall score based on 29,047 reviews
8.1
Boarding
7.8
Comfort
8.5
Crew
7.8
Entertainment
7.5
Food
Airline reviews

Cons: "Space on airplanes"

Pros: "Good"

Cons: "The Anchorage airport was FREEZING cold and it was August, maybe a little less AC IS IN ORDER"

Cons: "Food"

Cons: "Cheerless stewards could perk up."

Cons: "No AC for an hour before takeoff - very uncomfortable. Audio for tv did not work."

Cons: "Nothing"

Pros: "the food was really top notch and service was great and friendly"

Pros: "On time flight, bag made it, great price, can’t complain."
Cons: "Seat pretty tight for an average size adult man. No inflight phone charger."

Cons: "Have rhe right to carry at least one luggage per person at no cost. Besides carry on and personal item. Tickets prices and luggage costs are extremely expensive."

Pros: "Everything was fine. Delta did a great job."
Cons: "The kid screaming in my ear for 3 hours"

Pros: "Boarded and left JFK on time and arrived 15 minutes early to Seattle. Love DELTA."

Cons: "Just not very pleasant, I guess you get what you pay for"

Cons: "Old plane"

Cons: "My friend and I was switched to an even worse seating when boarding. Very uncomfortable especially for my friend since he had crutches."

Pros: "Everything."
Cons: "No food or drinks"

Pros: "Boarding, friendliness of staff"

Pros: "Everything was easy and smooth."

Cons: "No dairy free options!"

Pros: "From check in from Delta App till receiving luggage, very smooth and painless process. Thank you!!"

Cons: "What food am I rating? The cookies?"

Pros: "Had the whole Comfort section to myself!"

Cons: "It didn’t take off on time"

Pros: "It’s was super smooth! Fast service and great customer service."
Cons: "The intercom was a little messed up."

Pros: "It was short and fast."

Pros: "I got home"
Cons: "Delta"

Cons: "price could be cheaper"

Cons: "You messed up my life with your poor service."

Pros: "Cannot. Figure out how to use the wifi."

Pros: "Zones are more delineated."
Cons: "People were obviously cutting in line and edging up before their zones were called."

Pros: "Nothing"
Cons: "The customer service and the strict nonsense rules"

Pros: "Everyone was fairly friendly"
Cons: "Cramped foot room"

Pros: "Loved how close the gates were"
Cons: "Nothing"

Pros: "Service"
Cons: "Lack of food options"

Cons: "Bags never arrived at the listed baggage claim. After 45 min, I saw bags on a different claim station and I notified everyone standing around. BUT, I filed a claim with Delta and was immediately given 2500 miles, as guaranteed!"

Pros: "The service was impeccable as always"

Pros: "Nothing!"
Cons: "Everything"

Pros: "Delta is great"

Pros: "See above"
Cons: "See above"

Pros: "No puedo opinar mucho del proceso de abordaje, ya que para el procedimiento de ingreso a la terminal fue bastante tardado. Pero la atencion por parte del personal fue bastante amable, las bebidas fueron abundantes y justas."
Cons: "I have no complaints"

Cons: "Trying too hard to fit as many as possible"

Pros: "None of it!! Poor selection"
Cons: "All of it. Again poor selection"

Pros: "Boarding super excellent! Also: Best landing I've ever experienced! Props to the pilot!!"

Pros: "Newer plane with movies."
Cons: "Airlines pack you on so tight."

Cons: "There was a kid screaming on both flights and t was not a good time"

Pros: "Excellent crew and comfortable flight"

Cons: "I was starving because of my short connection time and couldn't have lunch - wanted to eat something solid and they just had boxes with fruits and cheese."

Pros: "I always have a great experience on Delta! Thank you"

Cons: "So so food. Terrible delay leaving Beijing. Gatemoccupied in SEA."

Pros: "Same comment as above."
Cons: "Same comment as above"

Pros: "You will save money by using a full price, full-service airline.Front tier charges extra for tons of small things that would be free with a full price carrier such as carry-ons, checking in online. It’s confusing and takes a lot of energy to figure out how to make use of such a cheap fare."
Cons: "It’s confusing and takes a lot of energy to figure out how to make use of such a cheap fare."

Pros: "Nothing"
Cons: "Out of the four frontier flights I’ve taken in the past six months each one has been delayed for some reason. First one was over an hour late and caused a majority to miss connecting flights. Today’s experience was not a whole lot different. First leg of the trip was behind schedule, second was delayed at the terminal for the “cleaning” of the aircraft. I will walk to my destination before ever flying with frontier again"

Cons: "It’d be nice to have internet access, whether free or for purchase"

Pros: "Nothing"
Cons: "Service was the worst. The poor training of the staff, is clearly a result of poor commitment by the company to provide good customer service."

Cons: "Lack of communication and humanity in general."

Cons: "Delays"

Pros: "I arrived."
Cons: "It was an hour after boarding before take off. Another 15 minutes on the ground after landing waiting for a gate at midnight on a weekday. I understand that circumstances occur beyond the airlines control, but this has been routinely occurring on my trips with Frontier. Absent compelling reasons, I will not be flying with them again."

Pros: "The same"

Pros: "As above."
Cons: "As above"

Pros: "I was last on and only the 1st class was open so free upgrade"
Cons: "No complimentary snacks"

Pros: "Cheap tickets"
Cons: "You must experience the rigid, non-reclining seats packed impossibly close together to get the full Frontier experience. Nonetheless they often have the cheapest airfare so what is a budget traveler to do?"

Pros: "fare was good"
Cons: "the seat was terrible"

Cons: "Frontiers prices might look good upon booking but you are charged for everything. $45 extra for a carry-on, $2.95 for a can of soda, etc... cramped seating,"

Pros: "They stopped us from boarding as soon as they found out that there would be a delay."
Cons: "There was a computer problem on the plane that delayed the departure for 2+ hours. We were kept in the airport for the first delay but on the airplane for over an hour when the test was not passed. We were only apologized to and not give any compensation such as a beverage."

Pros: "Nothing"
Cons: "Everything"

Pros: "Arriving in my destination."
Cons: "Had to pay for my second bag, even though I prepaid for "the works." My carry on was already paid for in the prepaid package but since I decided to check it on my return leg, rather than carry it on....I had to pay $60 to check it. The funds prepaid to check one bag and carry on one bag should flex toward the carry on fee of a second bag. no curbside support."

Pros: "same as above"
Cons: "same as above"

Pros: "Staff was awesome and efficient"
Cons: "Food options, especially since one has to purchase snacks."

Pros: "Staff was friendly."
Cons: "No food or entertainment and nickle and dimed on everything."

Cons: "I felt taken advantage of by the surcharges."

Pros: "Cheap prices"
Cons: "Being stalled on the tarmac for over an hour arriving to Denver. People missing connecting flights. Plane arriving late leaving from Denver to Seattle. No complimentary beverages."

Pros: "My bag was lost in my FIVE HOUR layover in Denver, and no one could tell me where it was for five days. I only tracked it down by stalking some Frontier employees on their lunch break in seatac. I will never fly frontier again. Money saved isn't even almost worth it"

Pros: "the price. Staff are lovely. laughed at the mini-tablet sized "tray table.""
Cons: "Pity anyone over 5'7" or overweight -- least legroom I have seen on an airline to date. I would fly again squashed on a plane... but I would tell most men, there is no room for them. DVT waiting to happen. Oh gate guy at Denver told me my gym bag carryon was oversize (it wasn't).. guess they are obligated to try to get us to pay for "extras." I did not pay because the bag was smaller than their carryon template."

Pros: "Price to change ticket was exorbitant."
Cons: "They were going to charge me 3x the price I paid to change flights and I still had luggage fee (one bag to check-in who travels without luggage?!)"

Pros: "speed on check in, age and competent attitude of stewards(esses), clean passenger area."

Cons: "At every point, this airline tries to nickle and dime you. Costs for luggage and carry ons drive the price up to that of other tickets. The seats are very cramped and do not recline."

Cons: "seats could be a little softer maybe some memory foam??"

Pros: "See above."

Pros: "Nothing"
Cons: "Everything"

Cons: "Charging for carry ins makes me never want to fly frontier again"

Cons: "I wish the headrest had those little flaps you can fold up to rest your head on--would have made the fact that the seats don't recline better."

Pros: "Airbus jet was nice. Frontier credit card sign-up was offered."

Cons: "The fees for seat assignments and carry on luggage. Frontier also does not accept TSA Pre-check."

Pros: "Gate attendent was rude and unhelpful to other passengers."

Pros: "speedy, safe, and friendly"
Cons: "no complimentary drink or snack. seats where uncomfortable"

Pros: "The original price"
Cons: "Carry on should be included in the price and it doesn't cost the airline anything for me to choose my seat. I shouldn't have to pay for it. The new seats are uncomfortable. I have seats like that in my aluminum flat bottom fishing boat"

Pros: "In order to have cheap fares, Frontier charges fees for EVERYTHING. Carry-on luggage, anything besides water, etc. If you can fit everything you have into a small backpack and bring your own snacks, no big deal. If not, I'd recommend a different airline."

Pros: "Letting me in though I got a bit late to the gate, due to unexpectedly log TSA lined"

Pros: "Attendants are friendly and deserve to work at a more respectable airline."
Cons: "The elimination of tray tables is so cheaply appalling. Just to shove a few more rows of seats on a plane while sacrificing everyone's comfort and space. Could have shipped my luggage for cheaper than all the added fees. Will avoid this airline in the future."

Pros: "Frontier got me to my destination safely. That's it."
Cons: "EVERYTHING!!! Not enough ticket agents. Worst airline ever!!!!"

Cons: "It's just the cheapest option, and they pretty much surprise you with a ton of random fees that you aren't told about when purchasing the ticket. It's sneaky and annoying and I don't have respect for this airline. Not to mention that the seats lack comfort, there is little to no legroom, no tray tables, and no complimentary drinks. Bummer-- I'm sticking with Alaska Airlines from now on."

Cons: "Paying for seat AND baggage is reason to fly Southwest."

Pros: "same as above"
Cons: "same as above"

Cons: "Frontier has the absolute worst customer support software...wouldn't let me print a boarding pass...AND WHY DON"T YOU HONOR THE TSA PRE-PASS PROGRAM???"

Pros: "See cooment above"
Cons: "See comments above"

Pros: "The fuselage had a modern and roomy design. It was tall person friendly at least the seat I was in"
Cons: "Checked luggage price!!! 40$ was ridiculous..."

Cons: "All Frontier flights were cancelled for 2 days straight, therefore I had to book with another airline."

Cons: "Finding that getting a seat costs extra"

Cons: "My mother did not get one of her bag back when we arrived in Seattle"

Pros: "Nothing"
Cons: "Spirit airlines is the worst"

Pros: "Easy check-in process."
Cons: "No outlet to keep electronics charged."

Pros: "cheap"
Cons: "cheap"

Pros: "For the price it’s a wonderful price. No complaints"

Pros: "Great deal!"
Cons: "A little cramped"

Pros: "Everthing is better"

Pros: "Cost savings, ease of use and cleanliness of aircraft!"

Pros: "Nothing"
Cons: "Nothing"

Pros: "cheap! direct!"
Cons: "cramped. last minute fees out the wazoo."

Pros: "excelente"

Cons: "Having to pay $65 for small carryon bag"

Pros: "The price."

Pros: "We received an unexpected upgrade."
Cons: "We boarded the plane and had to wait an hour and a half before take off. Really strange and loud noises coming from the plane making the experience unsettling."

Pros: "Leg room!! Love it. Thank you"

Pros: "I love the price point and the availability of the flights."
Cons: "Sitting in the middle seat is a very tight and uncomfortable experience, especially with no WiFi or entertainment."

Pros: "Arrived 30 minutes early"
Cons: "Rough ride, rough landing"

Pros: "Seamless. I’ll fly Spirit again!!"

Cons: "small spaced aircraft..."

Pros: "Quick on and off. I splurged and got a wider front seat (I'm not overweight but wanted to be able to move around a bit."
Cons: "The attendants were going up and down aisles serving food/ beverages while the seatbelt sign was on. It seemed unsafe. Did they feel compelled because they were expected to sell?"

Cons: "Everything was really bad. I will recommend everybody to run very far away from this company"

Cons: "Plane was way too hot."

Pros: "It was cheap"
Cons: "It was "cheap""

Pros: "We arrived a few minutes early"
Cons: "They kept changing their minds on whether my son had to check his skateboard. Finally decided yes, charged us for another bag when if they had told us earlier, we could have added it. Then the board arrived at baggage claim long after all other bags. The skateboard had been ridden, was soaking wet and bearings are ruined."

Cons: "Huge guy that didn't fit within the seat made it a terrible ride for me"

Pros: "Nothing"
Cons: "Same as above. NEVER AGAIN"

Pros: "Nothing"
Cons: "Nothing"

Pros: "I liked it much better before priceline took over"
Cons: "I don't like the fact that I can no longer print my boarding pass before I get to the airport"

Pros: "Good cheap fare"
Cons: "Smaller carry on size"

Pros: "Price and employees."
Cons: "Lack of leg room."

Cons: "Delayed"

Cons: "no wifi"

Pros: "Loved our pilot! He had a fantastic personality and made us feel at ease."

Pros: "Reasonable price, comfort was okay, no delays, bags arrived in timely manner"
Cons: "Add ons, plane seemed a bit dirty(seat area and windows), facilities were clean though."

Pros: "Staff was very nice!"

Pros: "Nothing"
Cons: "Everything."

Pros: "Flights were timely"
Cons: "Air conditioning had low flow and wasn't very cold."

Cons: "Late"

Cons: "None existent."

Cons: "Delayed"

Pros: "You are definitely not inexpensive. I will do everything in my power to not use your service again. Your luggage policy is abominable. No thank you!!!!"

Pros: "Nothing"
Cons: "Horrible customer support and policy's."

Pros: "My trip was totally on schedule, the plane was new and clean, and the staff did a great job."

Pros: "Low cost"
Cons: "Carry on fee way too much $$"

Pros: "It was safe"
Cons: "It was expensive and uncomfortable"

Pros: "Delayed"
Cons: "Being delayed"

Pros: "The person sitting next to me"
Cons: "Plane was delayed"

Pros: "Nothing"
Cons: "Everything"

Pros: "Very pleasant and laid back attendants were very polite and courteous and my name is David"

Pros: "Affordable and easy. Thanx :)"

Pros: "Friendly staff"

Read more about Delta
COVID-19 information

Safety measures for airlines flying from Denver to Seattle

Airlines flying from Denver to Seattle have enacted additional safety measures and adjusted policies to better accommodate travelers. Policies vary by airline.

Heightened sanitation

Daily cleaning, installation of cabin HEPA filters on flights from Denver to Seattle

Mandatory masks

Masks required on board, masks provided on flights from Denver to Seattle

Social distancing seating

Middle seats unavailable to book on flights from Denver to Seattle

Pre-flight testing

Testing for antibodies, testing for symptoms for flights from Denver to Seattle

Book cheap flights from Denver to Seattle

Recent round-trip flight & train deals

4/1
Thu
nonstop
Frontier
3h 08m
DEN - SEA
4/6
Tue
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2h 38m
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3/18
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3/23
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2h 38m
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8h 21m
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Recent one-way flight & train deals

3/8
Mon
nonstop
Frontier
3h 10m
DEN - SEA
3/11
Thu
nonstop
Frontier
3h 08m
DEN - SEA
3/23
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5/13
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6h 00m
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21h 22m
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3h 08m
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Amtrak
60h 51m
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3/28
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1 stop
Amtrak
60h 51m
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Average price
Flights $311
Trains $424
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