Frontier's Economy Bundle offers a carry-on and seat choice, ideal for budget travelers.
Consider Premium Bundle for extra legroom and priority boarding at a small additional cost.
Planning a trip from Denver to Seattle? KAYAK’s data-powered insights will help you find cheap flights. Learn the best time to fly, how early to book your ticket, and other tips to secure great prices.
Based on flight data for the Denver to Seattle route, it's generally cheaper to fly on Saturdays and in the month of January. Here are some tips to help you save money when booking this route:
Cheapest Route: Stick to the direct route from Denver International to Seattle/Tacoma International for the best prices.
Booking Advance: Try to book your flight at least 21 days in advance to get the best rates.
Cheapest Airline: Consider flying with Frontier, as it generally offers the cheapest fares for this route.
Direct or Layover: It's cheaper to fly direct on this route than with a layover.
Route Selection: The direct route from Denver to Seattle is typically the cheapest option.
This feature is powered by ChatGPT: an OpenAI-developed artificial intelligence model trained with KAYAK proprietary data and third-party data not verified by KAYAK.
Low season | January |
---|---|
High season | July |
Cheapest flight | $58 |
Find which airlines fly direct from Denver Intl Airport to Seattle/Tacoma Intl Airport, which days they fly and book direct flights.
Direct departures
Denver Intl to Seattle/Tacoma Intl
Monday
ANA, Air France, Air Tahiti Nui, +18 more
ANA, Air France, +19 more
17
18
Tuesday
ANA, Air France, Air Tahiti Nui, +15 more
ANA, Air France, +16 more
14
15
Wednesday
ANA, Air France, Air Tahiti Nui, +18 more
ANA, Air France, +19 more
17
18
Thursday
ANA, Air France, Air Tahiti Nui, +17 more
ANA, Air France, +18 more
16
17
Friday
ANA, Air France, Air Tahiti Nui, +18 more
ANA, Air France, +19 more
17
18
Saturday
ANA, Air France, Air Tahiti Nui, +18 more
ANA, Air France, +19 more
17
18
Sunday
ANA, Air France, Air Tahiti Nui, +19 more
ANA, Air France, +20 more
18
19
Direct returns
Seattle/Tacoma Intl to Denver Intl
Monday
ANA, Air France, Air Tahiti Nui, +19 more
ANA, Air France, +20 more
18
19
Tuesday
ANA, Air France, Air Tahiti Nui, +16 more
ANA, Air France, +17 more
15
16
Wednesday
ANA, Air France, Air Tahiti Nui, +19 more
ANA, Air France, +20 more
18
19
Thursday
ANA, Air France, Air Tahiti Nui, +18 more
ANA, Air France, +19 more
17
18
Friday
ANA, Air France, Air Tahiti Nui, +19 more
ANA, Air France, +20 more
18
19
Saturday
ANA, Air France, Air Tahiti Nui, +19 more
ANA, Air France, +20 more
18
19
Sunday
ANA, Air France, Air Tahiti Nui, +20 more
ANA, Air France, +21 more
19
20
So much better coming back to Seattle than my trip TO Chicago. This crew actually communicated with the passengers!! Rebecca, one of the crew, stopped and visited with me about sign language. She should get a bonus of some kind!! She's a very neat gal!! It was still warm inside the plane, but it was packed! I still think you could do better than those teeny tiny pretzels! These were spicy and tasted terrible! All in all, still a better ride coming home. Go Seahawks!!
So much better coming back to Seattle than my trip TO Chicago. This crew actually communicated with the passengers!! Rebecca, one of the crew, stopped and visited with me about sign language. She should get a bonus of some kind!! She's a very neat gal!! It was still warm inside the plane, but it was packed! I still think you could do better than those teeny tiny pretzels! These were spicy and tasted terrible! All in all, still a better ride coming home. Go Seahawks!!
Arrival delay waiting for another flight to be towed and deboarded
Express the need to arrive at the airport more than 2 hours ahead of BOARDING TIME due to super slow security lines at the Lihue airport. 4 ppl in a party of 9 nearly missed the boarding.
This flight was delayed but otherwise comfortable except for some turbulence. The crew was minimally engaged with us but nothing particularly bad in our interaction. The pilot was incomprehensible mumbling whenever he got on the air - honestly, impossible to understand. However, there were two flights that multiple people were trying to connect to that were leaving in 10 minutes after our flight landed (one to Alaska and one to Oregon). The passengers in the back reported to me that they asked the flight attendents to assist them in getting out first to try to make those flights- they reported that they were told that this would not occur because "people aren't so nice". NOBODY from the flight crew announced that there were people who needed to catch a tight connection and to please let them off first. I was in row 16 and when I heard this, I made an announcement myself and worked to get those trying to make those flights out first. Unfortunately, a lot of people were already in the aisles and these folks were slowed getting out. But what is wrong with the Alaska team that they wouldn't help those passengers???? One of the things I love about flying Alaska is that generally the crews are special people who seem to enjoy their jobs (despite the challenges of working with the public) and try to assist however they can. I would have liked to see the Alaska crew make an announcement to assist getting passengers with a tight connection due to the delayed flight out first. I think that Alaska often stands out because of the niceness of the crews, but this was a fail. Honestly, a huge fail. Please do better next time. I really believe in Alaska and fly preferentially on Alaska, but that means standing out from the crowd to do the right thing in being kind when we can.
The plane was in pretty rough shape-- worn down with a bit of a smell. The crew as less than stellar as well.
Kayak and Alaska have our trusted traveller information stored in our profiles. But, that information never made it to Alaska when it came time to check into our outbound flight. As a result, we were not cleared for TSA recheck. I was able to add in that information for our return flight and we had TSA Recheck on the return. I really expected Kayak and Alaska to do a complete job with our booking given the amount of information you have on file.
Not good, because they don’t serve me any drink with my meal. I asked but he said he forgot my drink again
It was an amazing experience for the first time doing my second flight by myself. Crew are friendly and they makes sure the customers meet their needs. I will use Alaska airline again for my next vocation. Thank you all for your hard work.
Everything was really good except it was really cold in the plane,
Everything was fine, although I expected to be given a light snack, like other airlines do, but that didn't happen. Nothing at all.
Flight crew and cabin crew were great. I had to rearrange flights because my original flight was 3hrs delayed for weather, the rub is the flight I moved to boarded on time then we sat at the gate for 2 hours because scheduling stole our first officer for another flight, TWICE. Then our actual FO was an hour delayed. To make it worse my original flight went from a 3 hour delay to departing 15min EARLY. Just poor scheduling operations all around.
Bring back peanuts Take our drink orders when were all seated, especially after you switch to assigned seating.
Staff was far less than helpful at all times. Departure and arrival times mean nothing to Southwest. Extremely disappointed, will never fly with them again, and I’ll be sure to share my experience with all.
It is southwest seat was ok. Not the most comfortable seat
I’ve always loved Southwest. No issues at all. I was flying standby and the gate agent was extremely friendly and helpful. Boarding was smooth and I was able to get a window seat in the emergency exit row. Crew was fantastic! They were very professional and accommodating. We had to divert from our destination due to weather but the flight crew kept everyone at ease and informed us of all pertinent information. Excellent flight
The price of the tickets isn't matching the flight experience. No matter how long the flight is, you're only getting pretzels. The flight attendants looked unkept and over it.
Plz don't take away free bags and free seating
The seats were a bit cramped and worn, but otherwise okay.
I would have liked to arrive on time - not 5 hours late!
After a 3 hour layover in Denver my flight was delayed over 5 hours! No explanation; no assistance; no offer to provide compensation; no one at Southwest was willing to offer any assistance. 8 hours in the Denver airport - ridiculous!
Good flights. On time. They had a gluten free snack option which was nice
Take this flight once or twice a month. Just don’t cut it from the schedule.
737-800 in first class was pretty dumpy. Seat had an uncomfortable angle, storage under the seat was blocked so even my very modest backpack didn't fit, power outlet was flaky. Weird tiny seat pockets that couldn't hold a gallon ziploc bag, emesis bag missing, etc. etc. No in-flight service due to turbulence. Crew was excellent, boarding was smooth despite a full flight.
Food from the flight from Atlanta to Santiago was very poor..
Flight was delayed due to weather. Crew did a nice job of making us comfortable. No complain complaints.
Delta is my preferred airline. I've traveled with them for years. On time in most cases, good communication, easy to use app. Most planes are pretty nice. I was on a CRJ 700/900 however, which was pretty badly aged inside and needed a refresh. No infotainment, unreliable wifi, best to download before boarding or bring a book. Food choices are really just snacks on this flight, nice variety but about what you'd expect. Great staff and prompt in departure and early arrival too. Overall quite satisfied.
Crew was friendly Love the entertainment in the seat head rest.
Delta flight was on time, seats were comfortable, and crew was nice.
The worst part was I was NOT allowed in the lounge even though I was holding a first class ticket and have a premium American Express card. I have flown Business or First Class with many airlines. Delta is the ONLY one who does not extend this courtesy to anyone except people who hold the very expensive American Express card. As a result, I won’t fly Delta if I have any other choice.
Flights on time. .Ride was as comfortable as can be expected in steerage. Luggage arrived at destination. Attendants were fairly friendly.
Electric plugs didn't work. Entertainment system wasn't working
The design of the light switch on the arm rest is ridiculous.
leg space better than expected. two washrooms for one plane isn't enough.
The gate attendant let me walk right by her with a bag too big for the overhead compartment
The seats on this flight were almost roomy enough to be the basic amount needed for human existence. I think my favorite part of this flight was it landed at an A gate, which was the most palatial part of Sea-Tac I've ever seen - a massive improvement from the S gates.
The seats on this flight were almost roomy enough to be the basic amount needed for human existence.
Overall, it was a good experience. Boarding was good and there was plenty of overhead bin space for everyone’s carryons (even when we boarded toward the end). Only improvement would be to offer trash service more regularly.
David went above and beyond to make our flight the best that it could be
No food service almost missed because of first flight delays
Had a hard time finding my assigned seat. No attendants to assist.
Everything went as planned. Crew was great. Seats were still not that comfortable.
they delayed my flight which ended up, causing my layover flight to leave without me, resulting in me missing a flight and having to stay overnight in Houston international. I got no compensation other than a flight to my original location only a day later. i’ve never experienced such a unprofessional situation
The seats were extremely hard and uncomfortable, even for a budget airline.
Boarding was very well executed. Got my bag right away.
Overall experience good. There was no food and seats were not terribly comfortable.
There was nothing to like, flight delayed had to move to different departure areas, disorganized to say the leasr
There were a lot of issues every step of the process. Check in, security, boarding, and dealing with luggage. Plus the money you think you are saving you end up using in hidden fees.
The flight attendant was arguing with a passenger before takeoff. The passenger was frustrated but the flight attendant should have handled it with grace, but instead she was nasty and rude. The seats were comfortable and the flight was uneventful. I wish we didn’t have to pay for drinks or snacks but that’s what you get with a budget airline.
Booked two aisle seats and were switched to an aisle and middle. Not happy.
I fly Frontier often and generally don't have any issues. For some reason, the Denver to Houston's George Bush Intercontinental (IAH) flight always needs to wait on the tarmac in Houston because a gate is not available after landing. I've been stuck for as little as 15 minutes and as much as a little over an hour. I know only fly the Frontier Denver to IAH route when there is not an available flight to Houston Hobby (HOU).
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