$42 Find Cheap Flights from Washington to Colorado

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Low seasonApril
High seasonJuly
Cheapest flight$42
Best time to beat the crowds with an average 13% drop in price.
Most popular time to fly with an average 2% increase in price.
Flight from Seattle to Denver

Flights from Washington to Colorado: the best tips from KAYAK users

Insights shared by verified travelers who flew the route from Washington to Colorado 
Verified travelerFlew with Alaska AirlinesSEA-DENMar 2025
Alaska Air is very efficient & on-time so allow enough time to get luggage, go thru Customs & Immigration, & long security lines. Terminals in SEA are readily accessible by trains but more signage is needed. Fortunately, Information booths are everywhere & are manned by very helpful staff.
MichaelFlew with DeltaSEA-DENApr 2025
Train from Denver airport to downtown is easy to use.
Verified travelerFlew with Alaska AirlinesSEA-DENMay 2024
When flying from Seattle to Denver, be ready to take our any electronics and put them in separate bins when going through security. You will also most likely have to take off your jacket as well. During our flight back the flight randomly changed so be on the lookout in case that happens to you! It was by chance that I checked my ticket and saw that the gate changed last minute.
Verified travelerFlew with United AirlinesGEG-DENApr 2024
Time to switch planes should be more than 60 minutes.
Verified travelerFlew with United AirlinesPSC-DENFeb 2024
TSA doesn't open til 1030 so getting to the airport early isn't helpful

FAQs for booking flights from Washington to Colorado

  • How does KAYAK find such low prices on flights from Washington to Colorado?

    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 Washington to Colorado.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from Washington to Colorado 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 Washington to Colorado?

    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 from Washington to Colorado with an airline and back with another airline.

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

    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 from Washington to Colorado up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

  • Which is the cheapest airport to fly into in Colorado?

    Prices will differ depending on the departure airport, but generally, the cheapest airport to fly to in Colorado is Denver Intl Airport (DEN), with an average flight price of $206.

  • What is the cheapest day to fly to Colorado?

    Based on KAYAK data, the cheapest day to fly to Colorado is Saturday where round-trip tickets can be as cheap as $269. On the other hand, the most expensive day to fly is Monday, where round-trip prices are $338 on average.

  • What is the cheapest time of day to fly to Colorado?

    The cheapest time of day to fly to Colorado is generally at night, when round-trip flights cost $211 on average. Morning departures are around 16% more expensive than evening flights, on average. The most expensive time of day to fly to Colorado is generally in the morning, which is peak travel time and where the average cost of a ticket is $331.

  • What is the cheapest flight to Colorado?

    The cheapest ticket to Colorado from Washington found in the last 72 hours was to Denver, at $99 round-trip. The most popular route is Spokane (GEG) to Denver (DEN) and the cheapest round-trip airline ticket found on this route in the last 72 hours was $99.

  • What is the cheapest month to fly from Washington to Colorado?

    The cheapest month for flights from Washington to Colorado is June, when tickets cost $283 (return) on average. On the other hand, the most expensive months are April and March, when the average cost of round-trip tickets is $400 and $397 respectively.

  • How far in advance should I book a flight from Washington to Colorado?

    To get a below average price on the flight from Washington to Colorado, you should book around 3 weeks before departure. For the absolute cheapest price, our data suggests you should book 12 weeks before departure.

  • How long is the flight to Colorado?

    An average nonstop flight from Washington to Colorado takes 5h 53m, covering a distance of 913 miles. The shortest route is Spokane (GEG) to Denver (DEN) with an average flight time of 2h 15m.

  • What are the most popular destinations in Colorado?

    Based on KAYAK flight searches, the most popular destination is Denver (91% of total searches to Colorado). The next most popular destinations are Colorado Springs (2%) and Grand Junction (2%). Searches for flights to Durango (2%), to Montrose (1%) and to Aspen (1%) are also popular.

Reviews of the top 5 airlines serving from Washington to Colorado

 
Need help choosing which airline to fly with from Washington to Colorado? 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 10000 reviews
8.1Boarding
7.8Comfort
8.5Crew
7.1Entertainment
7.1Food
Airline reviews

I was expecting better service from Alaska Airlines. I registered for assistance since I have a disability. The terminal in Seattle, WA was very unprofessional and at times rude. The BWI location was the exact opposite. I will NOT consider Alaska Airlines for future flights.

6.0 GoodAnonymous, Jun 2025SEA - BWI
Read more Alaska Airlines reviews

I was expecting better service from Alaska Airlines. I registered for assistance since I have a disability. The terminal in Seattle, WA was very unprofessional and at times rude. The BWI location was the exact opposite. I will NOT consider Alaska Airlines for future flights.

It was very good and comfortable, Crew was also great

The flight was delayed almost an hour. No wifi on flight.

Good experience, although it was a little cramped being a tall person. Otherwise everything went smoothly and professionally though

We have always flown with Alaska when we can. As they have great customer service. This trip we had to transfer to Air LINGUS in Denver to go to Dublin. That’s where things went bad! Our checked luggage didn’t arrive. The process to make a claim was way more complicated than it should be. It took 5 days to recover our luggage. The whole time we couldn’t talk to a real person who could tell us anything. The whole time Alaska blamed Air lingus and vis a versa. No one seemed want to help us. That was the worst part.

Delay of more than 3 hours I didnt recieve neither a voucher for food Attention disaster

Flight was 1:20 later than booked & I never received notice. At airport way too early. Couldn’t hear announcements on PA system. Crew fine. Retrieving luggage fine. Overall experience not good.

I will never take a red-eye flight again. Crying babies. Complete full flight. Could not get comfortable. Not fun.

Flight was OK, landing not good, boarding was ridiculous. Flight was to load at gate n11 25 minutes before boarding time it was changed to s5 which is 3 tram connections on the other side of the airport, I'm handicapped and even getting a sky cap took 10 minutes needless to say just made it to boarding only because it was delayed. I did learn a valuable lesson don't show up for flight 2 hours early.

Only issue was the 2 hr delay after an 8 hr layover. Very long day.

Delayed flight. Nicest crew member was a SW pilot flying seated next to me who kindly move to seat the final passenger. Flight extra delayed. My cup of refreshment of ginger ale was so packed with ice it was literally 2 sips.

For my birthday trip this was my second time ever flying, this trip was the best.

after landing, we stay 2 hours on the taxi way before reaching the gate The airline and the crew were good though

No trays in our seats, we sat in first row, purchased a business class fare. Had to hold our drinks and snack in our hands. No plugs for our cell phones. Had to pay for it a drink cocktail each. Seats so uncomfortable.

Flight wasn’t even full, but too many carry-ons caused us to run out of bin space. New bag fee has folks who would usually check their bags carrying on. Watching Southwest morph into Spirit/Frontier is so sad to watch

Sat on tarmac for 2 hours and then missed my connecting flight

First time traveling on Southwest since bag fees were implemented. Usual good service. Just more expensive now.

Everything was on time. I was disappointed by the front section female, African American flight attendant. I did not see her name tag or would have identified by name not race. As passengers moved to the bathroom early in flight, she would say with a disdainful tone “I have to say the seat belt light is on” then go back to her book. Better trained flight attendants say something like be careful the seat belt light is on.

Flights delayed by 4-6 hours. Boarding was a mess and unclear. Bags were not at arrival airport and had never even been put on the plane. No idea when I’ll get them. Don’t fly into Denver!

Southwest is typically delayed, and it gets wearisome. It is no longer a discount airline and you get way less than you pay for when it comes to comfort and Ce.

From Atlanta to Savannah - flight connection was way to short (we weren't even late landing ) and flight was already boarding when we landed - we were told we were the last on board and so we had to gate check our bags. Once we got on the plane, there were at least seven open bag spots so that was unnecessary delay. There should be better communication between the gate agent and the crew.

Crew was excellent. Comfort seats not as nice as other kinds of planes.

Not a "Delta" issue, but a JFK issue: We booked a connecting flight with 3 1/2 hours between to clearn immigration and customs. Our inbound flight (BCN to JFK) was on the taxiway 45 minutes which ate into our layover time. Immigtration was insanely quick with the CBP MPC app; however, clearing TSA (again, after we were ALREADY cleared in Spain on the inbound international flight) took over 95 minutes. This left us with 10 minutes before boarding the connecting flight (JFK to SAN) to walk to the far end of Terminal 4 and try to find food. We didn't find any food that could promise to serve us in under 10 minutes so we boarded the Delta flight after coming off a plance and an 8-hour flight knowing that we wouldn't be served any food on the next 5 1/2 hour flight. I feel like Delta needs to put pressure on the JFK TSA to open more screening stations (by our count, we saw only 5 scanners open and a line of - as we said - over 90 minutes. The insult is that we WERE ALREADY SCREENED through TSA, but as you come off one flight into the USA, you have to go through the whole process again. It seems like if you have a connecting flight, there should be a way to pass through immigration and customs without needing to return through TSA.

It was a great flight and the stewards and stewardess were all kind and accommodating!! The seats were comfortable and entertainment screen excellent!

There are 4 flights in consecutive gates with about the same departure time. Two flights were boarding at the same time. One was delayed or boarding would be happening at the same time. I am not sure what Delta and LAX need to do to have a better layout at the end of Terminal 2

Flight was an hour late, who knows why. It was OK, nothing outstanding.

Only not having an assigned seat was an issue. Rest was great

There was a security issue at the airport and we were unable to land. We circled endlessly and then landed at another airfield for fuel. We then circled the airport again, almost landed but didn’t fully touch down before circling again. I am thankful to the crew for keeping us safe- the issue was the airline and staff at the airport getting us seats on our connecting flights. That part was hours of searching for someone and getting in double my steps.

Boarding was organised and relaxed. Crew were fantastic! Seats were lacking padding causing butt pain and stiffness.

I like for how they process during check in. It was very smoothly.

Very rough getting into denver. my kid threw up it was so rough.

Why wasn't this flight departure scheduled eith another crew so that it could leave on time? When we arrived in Denver we had so little time between flights we had run to the connecting flight. We should received some credit for the inconvenience.

I was supposed to be on business class at first class from Denver back to Miami due to weather changes. I missed my connection and it’s put on a flight to Fort Lauderdale. Instead of honoring my business class/1st class ticket, they put me in coach, but there were two first class seats open. I think it’s absolutely disgusting that I paid for first class $1300 ticket and they put me in economy and they had to open seats available and I have still not been refunded the difference. I ended up having to eat a snack box instead of the meal I was supposed to get and did not get home till 2 AM so I think that’s a little pathetic that I had to live off crackers for dinner And my poor dog ate some cheese and salami. Oh yes, apparently when they switched me to the new flight they forgot to mention I had a service dog

Excellent service despite turbulence during the flight. Flight attendants were remarkable!

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.

The gate attendant let me walk right by her with a bag too big for the overhead compartment

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.

Flight was late. Missed connecting in Denver. My new flight is more than 24 hours later and I have no room, vouchers, or compensation, and might also be bumped from the one tomorrow.

This was one of the first frontier airline flights this spring that wasn't delayed. It actually left on time. Some of the flight crew did not look happy, they didn't smile when the passengers were boarding or getting off the plane, and the passengers initiated greetings, not the staff. To me this was an odd experience to have with any flight/airline. I had a bad experience booking this flight. The price didn't solidify until late hours into the night. Ever time I purchased the ticket, I either received a denial email or an error because the price has changed, but it was never reflected on the flyfrontier or kayak websites until way after midnight on the date of travel. This caused me anxiety and irritation with the websites. Then I noticed a mishap with my name on my voucher as I went to check in, it was incorrect. When I proceeded to correct it, Frontier had no easy, let alone free, way to remedy it. I couldn't correct my name without a $75 charge, I couldn't cancel my voucher to repurchase it with the correct name without a $100 charge, because it was too close to departure. Then calling frontier was nearly impossible to remedy the situation with a human. It's already difficult to want to choose frontier because of all the upcharges, but you feel kinda trapped into doing so because it's the more affordable airline.

Our flight was cancelled. They could do nothing to help us get another flight that was timely. Because the first leg was cancelled we were unable to get to our connection. We had to book on an entirely different airline for today. So we spent more money, lost a day of vacation and will never fly Frontier again, so the 'we are sorry, here is $100 credit' is a joke since we won't be flying on Frontier.

I liked the turn-style feature at gate 209B at LAX. Very efficient process. The gate staff also made several, clearly directed announcements so I felt very informed.

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.

Book cheap flights from Washington to Colorado

Recent round-trip flight deals

7/29Tue
nonstopFrontier
2h 49mSEA-DEN
8/5Tue
nonstopFrontier
3h 06mDEN-SEA
$87
9/17Wed
nonstopFrontier
2h 43mPDX-DEN
9/20Sat
nonstopFrontier
2h 44mDEN-PDX
$87
7/25Fri
1 stopDelta
5h 13mPSC-DEN
7/28Mon
1 stopDelta
6h 21mDEN-PSC
$189
9/3Wed
1 stopDelta
7h 23mGEG-DEN
9/17Wed
1 stopDelta
5h 14mDEN-GEG
$197
7/24Thu
1 stopAlaska Airlines
7h 24mGEG-DEN
7/30Wed
1 stopAlaska Airlines
7h 29mDEN-GEG
$206
8/30Sat
nonstopSouthwest
2h 15mGEG-DEN
9/2Tue
nonstopSouthwest
2h 20mDEN-GEG
$214
9/1Mon
1 stopAlaska Airlines
4h 38mGEG-DEN
9/17Wed
1 stopAlaska Airlines
5h 46mDEN-GEG
$216
7/19Sat
nonstopUnited Airlines
2h 25mPSC-DEN
7/25Fri
nonstopUnited Airlines
2h 31mDEN-PSC
$219
9/11Thu
2 stopsSouthwest
8h 50mGEG-DEN
9/14Sun
nonstopSouthwest
2h 20mDEN-GEG
$222
8/13Wed
nonstopUnited Airlines
2h 20mGEG-DEN
8/20Wed
nonstopUnited Airlines
2h 23mDEN-GEG
$232

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Recent one-way flight deals

9/2Tue
nonstopFrontier
2h 49mSEA-DEN
$42
9/13Sat
nonstopFrontier
2h 53mSEA-DEN
$43
11/19Wed
nonstopAlaska Airlines
2h 31mPDX-DEN
$76
10/29Wed
nonstopUnited Airlines
2h 33mPDX-DEN
$79
8/13Wed
nonstopDelta
2h 44mSEA-DEN
$79
9/18Thu
nonstopDelta
2h 42mSEA-DEN
$87
7/30Wed
1 stopAlaska Airlines
4h 52mGEG-DEN
$88
7/30Wed
nonstopUnited Airlines
2h 20mGEG-DEN
$89
9/10Wed
nonstopSouthwest
2h 15mGEG-DEN
$99
10/25Sat
2 stopsSouthwest
8h 15mSEA-DEN
$102

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Last minute flights from Washington to Colorado

Last minute flight, train and bus deals

7/6Sun
nonstopFrontier
2h 39mPDX-DEN
7/11Fri
nonstopFrontier
2h 44mDEN-PDX
$97
7/5Sat
nonstopFrontier
2h 41mPDX-DEN
7/8Tue
nonstopFrontier
2h 47mDEN-PDX
$138
7/3Thu
multi-stopDelta
9h 09mSEA-COS
7/7Mon
multi-stopDelta
7h 04mCOS-SEA
$372
7/4Fri
multi-stopDelta
8h 51mSEA-COS
7/7Mon
multi-stopDelta
7h 04mCOS-SEA
$377
7/3Thu
multi-stopUnited Airlines
11h 10mSEA-COS
7/7Mon
multi-stopUnited Airlines
5h 24mCOS-SEA
$457
7/4Fri
nonstopUnited Airlines
2h 34mPSC-DEN
7/6Sun
nonstopUnited Airlines
2h 31mDEN-PSC
$469
7/7Mon
multi-stopSouthwest
11h 25mSEA-COS
7/23Wed
multi-stopSouthwest
7h 20mCOS-SEA
$493
7/7Mon
multi-stopSouthwest
7h 40mSEA-COS
7/23Wed
multi-stopSouthwest
7h 20mCOS-SEA
$523
7/3Thu
multi-stopAlaska Airlines
5h 27mGEG-DEN
7/8Tue
multi-stopAlaska Airlines
7h 29mDEN-GEG
$591
7/4Fri
multi-stopAlaska Airlines
10h 36mGEG-DEN
7/8Tue
multi-stopAlaska Airlines
7h 29mDEN-GEG
$600

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Everything you need to know for your flight to Colorado

Cabin class types available on flights to Washington

Cabin classes available on flights to Washington. Prices are the lowest found on KAYAK over the last 7 days. Price and availability is not guaranteed.

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