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Find cheap flights from Portland to Boulder from $47

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Portland to Boulder departing on 6/10. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
0 bags
Thu 6/27
Thu 7/4

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Good to know

Low season

January

High season

August

Cheapest flight

$47
Best time to beat the crowds with an average 38% drop in price.
Most popular time to fly and prices are also 0% lower on average.
Flight from Portland to Denver

When to book flights from Portland to Boulder

Are your dates flexible? Find out the best times to travel from Portland to Boulder based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price

FAQs for booking flights from Portland to Boulder

  • Which airports will I be using when flying from Portland to Boulder?

    When flying out of Portland you’ll be using Portland. Boulder does not have its own airport so you’ll be flying into nearby Denver Intl airport, which is 33.4 mi away.

  • How long does a flight from Portland to Boulder take?

    Direct flights cover the 989 miles separating Portland and Boulder in about 2h 31m.

  • How many flights are there between Portland and Boulder?

    22 direct flights run between Portland and Boulder on a daily basis. On average, there are about 159 departures each week.

  • What’s the cheapest day of the week to fly between Portland and Boulder?

    Consider leaving on a Friday and avoid Saturdays if you are looking for the best rates. For your return to Portland, you’ll find the best rates on Tuesdays and the most expensive ones on Sundays.

  • How does KAYAK find such low prices on flights from Portland to Boulder?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Portland to Boulder.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Portland to Boulder?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Boulder from Portland is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Portland to Boulder?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Boulder with an airline and back to Portland with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Portland to Boulder?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Boulder from Portland up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

  • Which airlines provide the cheapest flights from Portland to Boulder?

    In the last 72 hours, the cheapest one-way ticket between Portland and Boulder found on KAYAK was with Frontier for $47. Frontier offered a round-trip connection from $94 and Alaska Airlines from $168.

See more FAQs

Top tips for finding cheap flights from Portland to Boulder

  • There is no airport in Boulder. Instead, you’ll be flying into Denver Airport when flying between Portland and Boulder.
  • The cheapest flight from Portland to Boulder was found 49 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 June, July and August. The cheapest month to fly is January.
See more tips

Top 5 airlines serving Portland to Boulder

 
Need help choosing which airline to fly with from Portland to Boulder? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
8.0
Alaska AirlinesOverall score based on 9192 reviews
7.9Comfort
7.3Entertainment
8.6Crew
8.2Boarding
7.3Food
Airline reviews

The one stewardess was rude about helping me put my bag in overhead….she said “ Is it heavy ?” (I am 73 yrs old)

8.0 ExcellentAnonymous, May 2024PDX - SAN
Read more about Alaska Airlines reviews

The one stewardess was rude about helping me put my bag in overhead….she said “ Is it heavy ?” (I am 73 yrs old)

That flight was a terrible experience. Flying to Portland was not much better. I will not ever fly Alaska Airlines again. I have a temporary disability due to recent neurocervical surgery. I cannot lift heavy things, I cannot walk long distances without vertigo and fainting, and I required wheelchair assistance. I showed up an hour and a half before my flight. The wheelchair queue assistance person was rude and chastised me for showing up so late. An older couple showed up almost an half an hour AFTER me, and she was sweet as pie to them. There was a long wait for wheelchair assistance as they were backed up. When I got to the gate, the gate attendants were rude and again, I got chastised for being late, even though it was not my fault they were backed up. When I asked for help with my bags and boarding the plane, they told me it was my fault and they were not obligated to help me. I was treated like a big inconvenience because I had a wheelchair and I couldn't "just walk." One of them literally rolled her eyes at me. I kept silent, because I just wanted to get home and I felt like they would not let me on if I complained, but I was practically crying. When I got down to the door to board, the wheelchair person left, and I asked the flight attendants for help. They said, well, you'll have to stand there and wait, even though I said I couldn't stand very long, and another passenger said, "Oh just let me do it" and helped me down. I tried not to bother the inflight attendants, because everytime you did, they acted exasperated and stressed out. I paid $7.50 for a bag of Pirate Booty and a tiny turkey beef stick for dinner. I needed wifi to work during the flight, and it kept crashing on me repeatedly and resetting my online work, costing me valuable time. I had to pay twice to get it on my laptop and phone, but I did get a refund when I returned. When I got to NY, the Portland agents had not arranged for a wheelchair to meet me and I had to stand for fifteen minutes waiting for the very nice young man who found an empty chair and had to wheel me and another passenger with carry on luggage to the front of JFK all by himself. Never, ever again. You all should be ashamed of how you treat people with disabilities. The other people who needed assistance to get on this flight did not fare much better than me, from what I could see.

My experience for a sort flight was perfect and hassle free.

I didn’t like not knowing my seat till I got to the airport - and my boarding group was F (last).

My boarding pass birthdate was printed incorrectly causing me to spend an extra hour in a check-in and then again TSA line and to miss a chance to have dinner pre-flight. My window seat was given away and was replaced with a middle seat. I would have liked an opportunity to charge my phone and take advantage of movies but many of the departure gate chargers weren’t operational and I don’t know of an in-flight charging option, The flight left 45 late after trouble with unruly passengers, and I was glad staff removed them.

Horrible. I likely will have to spend several thousand dollars to rebook my international flights, due to their delays, plus a hotel in SF. I can’t wait to never fly them again!

Quick easy boarding. Airport was unprepared for early landing and we were waiting in the plane for 20 minutes before getting a gate.

It was so easy to board using my boarding pass on my iPhone, and I liked what I was given on the plane for food and drink, and everyone was very friendly.

dont re-route to San Jose. Re-route to closer airport. Provide shuttle bus to go to SFO, not just LYFT vouchers.

Staff seemed genuinely nice, not just going through the motions.

Flew first class so everything was great. But maybe because the flights were red eye, no meals were served, just chips. I flew Alaska Air 1st class at 9PM (2 hour flight) and they served beef short rib sliders!

Had to change aircraft due to a faulty door. Surprisingly it only caused about an hour and a half of delay. Delta handled this situation as well as can be expected.

Awful. Flight was continuously getting delayed and gates kept changing without any reason. Flight was delayed for more then 3 hours

Paid premium for Delta only to be on safe but tired old 767 with ancient cabin in mediocre condition. Poor wifi and horrible inflight entertainment. Hardly a premium experience. Should have flown SW and had fun flight crew and no pretense

Our flight to Zurich was delayed by almost 3 hours, so we missed our next flight. There was no indication it would be delayed this much. We were told the gate had changed and then it apparently took over 2 hours to load the "catering" on the plane. We were not compensated in any way for the trouble.

Rated entertainment as Mediocre as there were major problems with the Infotainment system that took probably a half hour for them to fix.

Your crew could maybe answer the call bell at least one of the times I pressed it. I pressed it first time with 2.5 hours left in our flight bc my partner was hungry and wanted a sandwich. We finally got the sandwich with 40 mins left in the flight.

Delta crushed it. Flight attendant in first was attentive and just never stopped. Honestly one of the best domestic flights I’ve been on.

They were an hour late and they didn’t have my wheelchair for me

The Flight crew didn’t serve us until about 1.5 hours into the flight because of turbulence but after it ended it was fine to move around. They served us water only and snacks and then NEVER, NOT ONE TIME came through to collect trash until right before landing about 1.5 hours later. There was absolutely no need for that. They crew was just standing around talking and visiting with each other and really never tried to see if we might want something besides water or even try to come pick up trash. This is VERY unusual for a Delta flight but it was not what I would have expected for a 4 hour flight.

The Wi-Fi was unavailable on this flight for some reason.

This was a Lufthansa flight, not United. The CSA at the counter, Ashley, was not only incompetent, but quite rude. Me and two other PAX waited over 7 minutes standing in front of her and another CSA and they ignored us. We joked that we must have accidently taken invisibility pills. She could have at least said "I'll be with you in a moment, I'm currently....". I could go on about how rude she and the other CSAs were (whispering, not communicating with me, blaming the situation on others, etc.). She would not work for me. Then, she gave me literally the worst seat on the plane. the worst. My seat kept getting bumped (rammed twice by the crew with their carts and about every 5 minutes by someone using the bathroom), listening to the bathroom all night, crowded seat, etc.

We ended up with seats in the very back. So they did not recline. Have no idea why, we reserved and checked in very early. The isles were very narrow and the seats had very little leg room. But they did give us water, and a snack.

I paid $380 for my one-way ticket from California to Minnesota. The fair did not include online check-in. I received instructions from their app to check in at a kiosk. At the kiosk, the boarding pass would not print until an actual person came to verify that I had a personal item and not a carry-on item, On the plane, the person next to me was drunk and allowed to continue to order alcohol. United is garbage I’d rather fly spirit.

The plane was dirty and the in seat air wasn't blowing as planes usually do.

This was a Lufthansa flight. Disappointing main meal. Very rough over Canada and arrival at FRA. IFE was almost unusable.

Positive: Entertainment via phone on the short was great and my first time. Good food and wine and head phones for free. Negative: Seat hardly reclined on the long flight. Breakfast was an egg with a bun. No egg choices and rather have something sweet like bun/jam and Youghurt.

They did get us booked on a later flight, but it made us miss our connecting flight. So, we had to stay and another state overnight with no luggage or clothes. Because they kept our luggage at airport for next flight on the next day.

Flight was on time. Staff were friendly. I paid for Economy Plus but was required to check my standard carry-on luggage due to lack of space on the aircraft. This cost me 30 minutes, unexpectedly, in waiting at the baggage claim. This experience did not meet my expectations.

Crew is way too many times on the intercom re explaining the same thing

No food not even water offered unless you buy it and no usb in the seat but other than that everything was good

Because our flight from marsh Harbor to Fort Lauderdale was over three hours delayed it caused us to miss our flight in Fort Lauderdale. Because we missed that flight, it cost us nearly $100 apiece for four different travelers which totaled nearly $400. We are seeking a reimbursement for the flight that we missed in Fort Lauderdale Florida.

Flight expected to leave at 6:40 pm ended leaving at 8:00 am the following day. I slept in a cold airport. Never again Spirit for me…

The flight was on time and nice as always for me with spirit but the cabin crew were not good. They left the lights on on a red eye for the entire flight.

This was the return leg of my journey with Spirit Airlines. Despite its reputation, I found no issues as it got me from point A to B safely and without delay, especially with no mechanical delays, which is fantastic in my book! The staff, from ground crew to cabin crew, were all pleasant and hassle-free. The flight was smooth from takeoff to landing. I have absolutely no complaints about this no-frills airline!

I got a one-way, last-minute nonstop flight from PDX to BWI for only $125. Yes, I got nicked $79 more for a checked suitcase and $89 more for the BIG SEAT option, but it was worth it, even with $4.50 for coffee and $10 for a snack (the latter no different than any other airline). The grand total was still less flying on any other airline.

It was the worst ever, i will be filing a lawsuit to get a refund. Our flight was delayed 4 hours so we would miss our connecting flight, we were not rebooked to our destination the same day, we were not offered any options to get home on the same day despite being clear that we absolutely cannot get stranded at night due to family, we were forced to book our own flights on a different airline to get home, and spririt is refusing a refund because our flight wasn't cancelled, only delayed. oh yeah, and they lost our luggage on the first part of the trip and you cannot get a hold of customer service when anything goes wrong, on hold for 30+ minutes. and their app breaks so you can't use that either.

This recognisable no-frills airline gets me from point-A to point-B. I was able to get to Chicago without stress. The checked baggage collection and reclaim could be improved.

The crew was the best and very accommodating I know you don't offer any complimentary items but water and coffee will not break the bank !!

My flight was cancelled!!! I had to spend 200.00 on another flight!!

Frontier won’t help you at the airport without paying $25. Carry on was $75. Then you get on the plain and every beverage or snack is also a charge. Seats are hard and real packed in. I would never fly them again.

The Frontier app wasn’t working. So I could not pay for a carry on the week prior to flying. They charged me 99$ at the gate to carry on a duffle bag.

Plane could have been more on time. More leg room .

Didn't like anything!! Horrible flight. Small seating area and hard seats. Butt was sore after 2 hour flight to Seattle No entertainment or free refreshments No wifi or USB charging receptacles to charge phone entoute like other airliners Luggage rates were 3 times as much as competitors. Difficult to navigate online luggue process to pre pay before flight Overall bad experience WILL NEVER RIDE OR RECOMMEND FRONTIER TO FRIENDS OR FAMILY MEMBERS!!! THIS IS A SHAME!! MOST MESERIBLE FLIGHT OF MY LIFE!! AND I THOUGHT SPIRIT WAS 👎 YOU GOT THEM BEAD HANDS DOWN!!

There were 3 leg for the trip and each leg was delayed by 90 minutes or more. The boarding process takes forever with people waiting on the jetway even though most folks do not have carry-on. The whole process is poorly managed.

Not have to pay for every single item to take a flight. Seating and delays sucked.

Terrible. Seats are bad and the baggage policy is inconsistent

I dunno. Depressing, uncomfortable (I’m poor), but on time and efficient.

Everything was good, and most importantly on time. They have been extremely tardy in some of my flights

They lost my baggage on my connection flight, it’s been 24 hours since I put my claim in and still no update on my bags.

Book cheap flights from Portland to Boulder

Recent round-trip flight deals

6/7Fri
nonstopFrontier
2h 33mPDX-DEN
6/15Sat
nonstopFrontier
2h 44mDEN-PDX
$94
8/25Sun
nonstopFrontier
2h 36mPDX-DEN
8/31Sat
nonstopFrontier
2h 45mDEN-PDX
$96
7/1Mon
nonstopFrontier
2h 33mPDX-DEN
7/3Wed
nonstopFrontier
2h 46mDEN-PDX
$98
7/2Tue
nonstopFrontier
2h 33mPDX-DEN
7/6Sat
nonstopFrontier
2h 43mDEN-PDX
$101
6/7Fri
nonstop
2h 33mPDX-DEN
6/10Mon
1 stop
4h 39mDEN-PDX
$139
6/7Fri
nonstop
2h 33mPDX-DEN
6/15Sat
1 stop
5h 56mDEN-PDX
$149
6/10Mon
1 stopAlaska Airlines
4h 51mPDX-DEN
6/17Mon
nonstopAlaska Airlines
2h 42mDEN-PDX
$168
6/10Mon
1 stopAlaska Airlines
4h 51mPDX-DEN
6/14Fri
nonstopAlaska Airlines
2h 42mDEN-PDX
$180
7/5Fri
1 stopDelta
6h 27mPDX-DEN
7/10Wed
1 stopDelta
4h 57mDEN-PDX
$216
7/6Sat
1 stopDelta
5h 02mPDX-DEN
7/9Tue
1 stopDelta
4h 57mDEN-PDX
$232

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Recent one-way flight deals

6/10Mon
nonstopFrontier
2h 33mPDX-DEN
$47
6/2Sun
nonstopFrontier
2h 34mPDX-DEN
$48
8/27Tue
nonstopAlaska Airlines
2h 35mPDX-DEN
$89
6/11Tue
1 stopDelta
5h 51mPDX-DEN
$95
8/27Tue
1 stopDelta
4h 54mPDX-DEN
$98
8/28Wed
nonstopAlaska Airlines
2h 35mPDX-DEN
$104
9/5Thu
1 stopAmerican Airlines
6h 11mPDX-DEN
$107
8/27Tue
nonstopUnited Airlines
2h 34mPDX-DEN
$119
8/29Thu
nonstopUnited Airlines
2h 34mPDX-DEN
$154
8/30Fri
1 stopAmerican Airlines
11h 53mPDX-DEN
$198

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Last minute flights from Portland to Boulder

Last minute flight, train and bus deals

6/2Sun
nonstopFrontier
2h 34mPDX-DEN
6/11Tue
nonstopFrontier
2h 44mDEN-PDX
$94
6/2Sun
nonstopFrontier
2h 34mPDX-DEN
6/8Sat
nonstopFrontier
2h 46mDEN-PDX
$104
6/2Sun
nonstopFrontier
2h 34mPDX-DEN
6/8Sat
nonstopFrontier
2h 46mDEN-PDX
$108
6/2Sun
nonstopFrontier
2h 34mPDX-DEN
6/11Tue
nonstopFrontier
2h 46mDEN-PDX
$112
6/2Sun
nonstopFrontier
2h 34mPDX-DEN
6/3Mon
nonstopFrontier
2h 45mDEN-PDX
$113
6/2Sun
nonstopFrontier
2h 34mPDX-DEN
6/6Thu
nonstopFrontier
2h 46mDEN-PDX
$118
6/2Sun
nonstop
2h 34mPDX-DEN
6/11Tue
multi-stop
7h 28mDEN-PDX
$149
6/2Sun
nonstop
2h 34mPDX-DEN
6/7Fri
multi-stop
4h 39mDEN-PDX
$192
6/1Sat
multi-stopAmerican Airlines
7h 27mPDX-DEN
6/4Tue
multi-stopAmerican Airlines
5h 10mDEN-PDX
$241
5/31Fri
nonstopAlaska Airlines
2h 38mPDX-DEN
6/5Wed
nonstopAlaska Airlines
2h 49mDEN-PDX
$402

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