Frontier's Economy Bundle includes a carry-on and seat choice, ideal for budget-conscious travelers.
Avoid Basic Fare to ensure seat selection and avoid middle seats; consider Economy Bundle for better value.
Planning a trip from Portland to Denver? 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.
Low season | February |
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High season | June |
Cheapest flight | $58 |
Find which airlines fly direct from Portland Airport to Denver Intl Airport, which days they fly and book direct flights.
Direct departures
Portland to Denver Intl
Monday
Alaska Airlines, Copa Airlines, Frontier, +5 more
Alaska Airlines, Copa Airlines, +6 more
4
5
Tuesday
Alaska Airlines, Frontier, Hawaiian Airlines, +3 more
Alaska Airlines, Frontier, +4 more
2
3
Wednesday
Alaska Airlines, Copa Airlines, Frontier, +5 more
Alaska Airlines, Copa Airlines, +6 more
4
5
Thursday
Alaska Airlines, Copa Airlines, Frontier, +4 more
Alaska Airlines, Copa Airlines, +5 more
3
4
Friday
Alaska Airlines, Copa Airlines, Frontier, +5 more
Alaska Airlines, Copa Airlines, +6 more
4
5
Saturday
Alaska Airlines, Copa Airlines, Frontier, +4 more
Alaska Airlines, Copa Airlines, +5 more
3
4
Sunday
Alaska Airlines, Copa Airlines, Frontier, +5 more
Alaska Airlines, Copa Airlines, +6 more
4
5
Direct returns
Denver Intl to Portland
Monday
Alaska Airlines, Copa Airlines, Frontier, +5 more
Alaska Airlines, Copa Airlines, +6 more
4
5
Tuesday
Alaska Airlines, Condor, Frontier, +4 more
Alaska Airlines, Condor, +5 more
3
4
Wednesday
Alaska Airlines, Copa Airlines, Frontier, +5 more
Alaska Airlines, Copa Airlines, +6 more
4
5
Thursday
Alaska Airlines, Copa Airlines, Frontier, +4 more
Alaska Airlines, Copa Airlines, +5 more
3
4
Friday
Alaska Airlines, Condor, Copa Airlines, +6 more
Alaska Airlines, Condor, +7 more
5
6
Saturday
Alaska Airlines, Frontier, Hawaiian Airlines, +4 more
Alaska Airlines, Frontier, +5 more
3
4
Sunday
Alaska Airlines, Condor, Copa Airlines, +6 more
Alaska Airlines, Condor, +7 more
5
6
Flight last minute delayed 2 hours for crew calling out sick
Flight last minute delayed 2 hours for crew calling out sick
Husband was new to the wheelchair accommodations this trip. What a blessing that was. All employees were helpful and customer service was excellent
Seats are still too crowded and uncomfortable on long flights like this cross country one.
Laney was very helpful. I am computer illiterate. She helped me obtain a boarding pass and preferred seat. She was warm, friendly, helpful, and smiled. I was impressed.
The actual flight I was rescheduled onto was from Seattle to Bozeman. The flight itself was fine, but due to delays/air traffic issues i spent the day hanging out at the Seattle airport and had to miss a day of work.
OUr pilot was very good and also a good landing in a very gusting Phoenix. Most important.
It was alright other than the changes in the Alaska Lounge. That and the migraine I had were disappointing. Other then that everything went well.
It was a short flight so no refreshments or entertainment which was fine.
Flying in both directions across country the gate designated on my boarding pass was wrong. From w to e across the country the passenger next to me coughed the entire way.
Although both planes (flights) had mechanical issue delaying both of my flights, the crew members handled everything with ease. Both flights had the smoothest take off and landing. I opted to upgrade my seat to first class and really lucked out getting the seat at the very front of the plane. Awesome treat to myself. I really enjoyed my flight.
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!
Really enjoyed their food treats, staff was friendly and they kept our seats together, check in was excellent, boarding passes uploaded to my wallet! I would definitely recommend Hawaiian airlines to friends and family! 🌺
I booked through Hawaiian which was supposed to have merged with Alaskan but offered free checked bags and said there would be seat selection at the airport. This was not honored by Alaskan Airlines and they even went out of their way to say “we are not Hawaiian and Hawaiian cannot pick seats on our airline ”. They told us that we could not change seats and that all tickets booked through Hawaiian were “saver fares”. The staff was rude and said that we would be helped last after they take care of the customers that booked through Alaskan. Once we got on the flight in our middle seats they played a message that said they have merged with Hawaiian and you can book on either website which would have been funny if we were not so uncomfortable. All in all it was a terrible experience and I do not recommend that anyone fly Alaskan unless they absolutely have to.
Absolutely terrible experience. Kayak issued tickets had errors and Hawaiian/Alaska would do nothing to help. Ended up buying a new flight and had to forfeit these tickets. I will never again do business with Kayak, Hawaiian or Alaska.
Great service, fast internet, got a lot of work done during the flight.
Cheap food no options for vegans, no entertainment, no snacks. Too much advertisement about their credit card. Next flight will be Delta Airlines.
Checking baggage at Honolulu was a real mess. No signs directing where to go.
I wasn’t able to check in online at either website Hawaiian or Alaskan. I called Hawaiian to check in the night before and was put on hold for 1h 30 min with no customer service help. Gave up and hung up. When I went to ticketing counter couldn’t check in at computer. Went to counter and they let 6 people check in before me. By the time I was able to check in all the seats were gone and got the worst seat assignment back seat with no reclining chair and next to the bathroom. Had I been able to check in online for both flights I don’t think I would have gotten stuck with a bad seat assignment. When I asked Alaskan check in person why I wasn’t able to check in online he said he couldn’t help me or tell me because he didn’t know. Never have had suck bad experience with either Alaskan or Hawaiian when they were not merged together.
We boarded an hour and a half late because a coffee maker leaked in the plane. Then we had to wait for awhile to get off the plane because another plane was in our spot at the terminal. I had plans when I landed that I had to skip so it was pretty disappointing.
When I was not allowed by Alaska airlines to board due to time and difficulty pre-check the night before and kiosk did not work when I arrived at the airport and then finally told Alaska airlines is where I had to go. Not Hawaiian airlines that they had moved. That's when I was treated with the utmost disrespect by Alaska airlines agent that I was not allowed to board. And that might ticket to return was canceled and I hadn't even left yet when they gave me the option for the next flight to raise my flight price to $300 one way. I bought a $96 round trip ticket and they're trying to gouge me for $600 in addition and canceling my return flight.
Alaska airlines was great, Kayak not so great. I couldn’t get my boarding passes and I was last to board. Will not use Kayak again, ever!
Flight attendant moved my bag without notifying me and was rude to me when I asked him about it. There was no reason to move it.
Food choices were very limited. Taste of the dishes was average.
I liked all the informational texts. I always knew where to go and when .
Received an email the night before showing that there would be seatback entertainment on our flight. We get on and there was no seatback entertainment. And then it was a scramble to try to set up the iPads for the kids before takeoff so they could watch something for the four hour flight.
The reason I don’t fly United. No in seat entertainment for a long flight and inconsistent WiFi and entertainment available from my device.
It was a good flight. Nothing comes to mind about how it could have been better. It was a newer plane, seemed like a great upgrade from your older ones. Staff was very good as well.
The food for long haul was poor compared to Singapore airlines economy. Pasta plain with tomato sauce . Singapore airlines give me Hagen dash small ice cream cup it was great. The choices of dinner course Singapore air also much better The crew mostly friendly. The economy seat are as expected.
The plane was clean. The staff was excellent. The flight attendants were very good. Enjoyable flight. Overall. The seats in the back are too small but, will always be.
Flight was 3 1/2 hour delayed with no credit or meal vouchers
late departure due to some unspecified issue with ventilating the cabin. They got it running but it was FREEZING for the whole flight. I asked for a blanket but they didn't provide one. They could not turn up the heat. it was quite miserable.
Seats are uncomfortable but price is good. Guess I can put up with misery for four hours.
The plane failed preflight inspection, so we sat there for 90 mins while they tried to fix it. Ultimately, everything was remedied and we made our connecting flight; instead of a 2 hour layover at the airport, we spent it waiting on the plane.
I loked walking out on the tarmac to board and no first class. I didn't like that they have no snacks or onboard wifi to bide your time.
The seats were extremely hard and uncomfortable. It was disappointing even for a budget airline.
Delayed each time on a round trip with no significant weather interference. Updates to flight times came after the fact. 30 min behind in boarding and board and phone still show an on time departure. Some mysterious extra 300 miles that came so surprising they had to fuel while we were already on board?
Our flight was canceled for no known reason. We weren’t told until we were checking in at 5:00 am. This was after our last flight with Frontier where we sat on the plane for three hours (not an exaggeration) before we took off because of a mechanical issue. We won’t be flying Frontier again.
Allowed me to chose my seat without extra charge (I purchased full-price ticket) and boarding was in group1. Didn't even serve water.
Stuck in Phoenix for two days, not even a hotel voucher offered.
Every day about it was very different all the boarding pass where all wrong l miss flight no refund all crazy
Flight got delayed for 3.5 hours, and for the first hour after the departure time there was no update from the gate folks...
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