S$ 495 Find Cheap Flights to Boulder

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight to Boulder departing on 10-3. 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.
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Cheap Flight Deals to Boulder

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for return flights to Boulder that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.

Recent return flight deals to Boulder

Recommended return deals departing in the coming months from the most popular airlines that fly to Boulder.
Discover the best prices and deals for you by selecting your travel dates.
Choose your dates
15:15 - 14:11SIN-DEN
36h 56m2 stops
22:49 - 19:10DEN-SIN
30h 21m1 stop
S$ 1,207
Find Deal
Tue, 8 Apr - Sat, 19 Apr
15:15 - 10:01SIN-DEN
32h 46m2 stops
22:49 - 19:10DEN-SIN
30h 21m1 stop
S$ 1,214
Find Deal
Thu, 10 Apr - Sat, 19 Apr
06:35 - 12:10SIN-DEN
20h 35m1 stop
07:45 - 20:15DEN-SIN
22h 30m1 stop
S$ 1,261United Airlines
Find Deal
Mon, 3 Mar - Sun, 16 Mar
20:40 - 12:16SIN-DEN
29h 36m2 stops
05:15 - 18:25DEN-SIN
23h 10m1 stop
S$ 1,317United Airlines
Find Deal
Sun, 6 Apr - Mon, 21 Apr
23:10 - 17:55SIN-DEN
32h 45m1 stop
19:50 - 07:30DEN-SIN
45h 40m1 stop
S$ 1,412Turkish Airlines
Find Deal
Mon, 14 Apr - Tue, 22 Apr
09:10 - 17:55SIN-DEN
46h 45m1 stop
19:50 - 07:30DEN-SIN
45h 40m1 stop
S$ 1,441Turkish Airlines
Find Deal
Fri, 4 Apr - Tue, 22 Apr
01:55 - 17:48SIN-DEN
29h 53m2 stops
18:18 - 17:30DEN-SIN
33h 12m2 stops
S$ 1,508Japan Airlines
Find Deal
Mon, 9 Jun - Tue, 17 Jun
01:55 - 17:48SIN-DEN
29h 53m2 stops
18:18 - 00:20DEN-SIN
40h 02m2 stops
S$ 1,523Japan Airlines
Find Deal
Sat, 7 Jun - Sat, 14 Jun
09:10 - 19:30SIN-DEN
24h 20m1 stop
08:15 - 07:05DEN-SIN
32h 50m1 stop
S$ 1,583Air Canada
Find Deal
Tue, 5 Aug - Tue, 2 Sep
09:10 - 21:40SIN-DEN
26h 30m1 stop
18:00 - 07:05DEN-SIN
23h 05m1 stop
S$ 1,728Air Canada
Find Deal
Sat, 5 Apr - Thu, 24 Apr

Good to know

Low season

March

High season

May

Cheapest flight

S$ 495
Best time to beat the crowds (12% less expensive on average)
Most popular time to fly and prices are also 8% lower on average.
Flight from Singapore to Denver

FAQs - booking Boulder flights

  • How to fly to Boulder?

    You cannot fly directly to Boulder. KAYAK recommends you fly to Denver Intl (DEN) (53.76 km from Boulder). From there you can rent a car or get a taxi.

  • What airports are near Boulder?

    The closest airport is Denver Intl (DEN) (53.76 km). KAYAK recommends you fly to Denver Intl.

  • How far is Denver Intl Airport from central Denver?

    The city centre of Denver is 30 km from Denver.

  • What is the name of Denver’s airport?

    When flying to Denver, you'll arrive at Denver Intl Airport (DEN). The airport is also known as Denver or Denver Intl.

  • How does KAYAK find such low prices on flights 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 to Boulder.

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

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

  • What is the Hacker Fare option on flights 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 with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight 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 up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

See more FAQs

Top tips for finding cheap flights to Boulder

  • There is no major airport in Boulder. It is instead served by Denver Intl Airport.
  • Book at least 1 week before departure in order to get a below-average price.
  • High season is considered to be January, February and December. The cheapest month to fly from Singapore is August.
  • Enter your preferred departure airport and travel dates into the search form above to unlock the latest Boulder flight deals.
See more tips

Top 3 airlines flying to Boulder

Need help choosing which airline to fly with from Singapore 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.
8.3
Japan AirlinesOverall score based on 1440 reviews
8.7Crew
7.7Food
8.2Comfort
8.4Boarding
7.8Entertainment
Airline reviews

Allow gold card holders (Group 1) to board with their guest like other One World carriers do

10.0 ExcellentMatt, Feb 2025HND - CTS
Read more Japan Airlines reviews

Allow gold card holders (Group 1) to board with their guest like other One World carriers do

Checked baggage process is confusing and time consuming especially when checking oversized bags. Very slow agents didn't help.

Website from the 1990s, super frustrating customer support, inflight experience merely OK - more like United than e.g. Emirates

The seats are significantly more comfortable than US airlines and the staff are much friendlier. The food is also much better, as they are particularly accommodating to any dietary restrictions.

Could had been better if they include in their menu some western food.

They 7 seats in one row for Business class while most business class for other airlines are 4 seats in one row. the seat was narrow. the Toilet was so smell, dimming light, no water out of faucet. Terrible.

Difficult to access advanced check-in online. No way to understand why it wouldn’t work. Call center not answering. Email for answers took days to respond, Kind service at the airport and on the flight made up for disappointing service before flight.

Courteous and helpful employees. Comfortable seats and temperature of aircraft . Did not need squid in my salad but glad to have the menu information advising me of what it was

Everything was great, except the Wifi, but that's understandable.

The plane was dirty, there was trash in the seat pocket in front of me.

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 .

Not as good as expected Air Can needs to improve totally rated on internet as worst

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 4 hours late. Almost missed my connecting flight no food or drinks on connecting flight. Overall terrible experience

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.

I was at the back of the plane with earphones, and I could still hear the chatty flight attendants; I wasn't able to sleep at all.

My flight was cancelled and I was left to figure out where to find a hotel, something to eat and how to get a new flight at 11:30pm. Wasted a day. Thanks, Air Canada!

flight was delayed 6 hours for weather, then cancelled because of the crash in toronto, but none of the links to cancel or rebook my flights are working

They kept changing the gate (6 times in 30 minutes) and then left us on the plane for 4 hours before departure. Likely was the storm, which is understandable, but the lack of communication and the e constant running between gates at opposite ends of the airport really threw me and my friend for a loop.

Legitimately everything about this flight was awful, was also so delayed I never want to use air Canada again

Terrible all around. Flight was late and airplane was very uncomfortable. The crew were unhelpful and hid in the back. Did zero work. No entertainment.

Because I am quite tall a bit more leg room would have been more comfortable. Out of three seats I had the middle one, unfortunately.

I like the free beer and wine but not the delays to the departure time.

Never again flying economy on Rouge!!! Literally like sardines!!! Will try to change to better seats 3 seat arrangement only so so if traveling with family. Who wants to squished to stranger!!😖 Can’t say enough bad about this!!!

I booked and paid extra for exit door seats also pre paid for my luggage air Canada changed plains and I never got what I paid for and they made me pay for luggage again they also did this to my wife. They are the most unorganized company I have ever dealt with. I am sure I will never see the extra money I paid for the seats or the recharge for the luggage. They are subsidized by the taxpayers and don’t give a dam just a horrible way to do business

Overall the experience was excellent. Plane was clean but more importantly quiet. Recently, I’ve noticed that Airbus planes seem quieter than their Boeing counterparts. I definitely prefer flying in an Airbus plane.

Book Cheap Boulder Plane Tickets

Recent return flight deals

8-4Tue
2 stops
36h 56mSIN-DEN
19-4Sat
1 stop
30h 21mDEN-SIN
S$ 1,207
10-4Thu
2 stops
32h 46mSIN-DEN
19-4Sat
1 stop
30h 21mDEN-SIN
S$ 1,214
3-3Mon
1 stopUnited Airlines
20h 35mSIN-DEN
16-3Sun
1 stopUnited Airlines
22h 30mDEN-SIN
S$ 1,261
6-4Sun
2 stopsUnited Airlines
29h 36mSIN-DEN
21-4Mon
1 stopUnited Airlines
23h 10mDEN-SIN
S$ 1,317
14-4Mon
1 stopTurkish Airlines
32h 45mSIN-DEN
22-4Tue
1 stopTurkish Airlines
45h 40mDEN-SIN
S$ 1,412
4-4Fri
1 stopTurkish Airlines
46h 45mSIN-DEN
22-4Tue
1 stopTurkish Airlines
45h 40mDEN-SIN
S$ 1,441
9-6Mon
2 stopsJapan Airlines
29h 53mSIN-DEN
17-6Tue
2 stopsJapan Airlines
33h 12mDEN-SIN
S$ 1,508
7-6Sat
2 stopsJapan Airlines
29h 53mSIN-DEN
14-6Sat
2 stopsJapan Airlines
40h 02mDEN-SIN
S$ 1,523
5-8Tue
1 stopAir Canada
24h 20mSIN-DEN
2-9Tue
1 stopAir Canada
32h 50mDEN-SIN
S$ 1,583
5-4Sat
1 stopAir Canada
26h 30mSIN-DEN
24-4Thu
1 stopAir Canada
23h 05mDEN-SIN
S$ 1,728

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Recent one-way flight deals

10-3Mon
3 stops
44h 53mSIN-DEN
S$ 495
6-3Thu
3 stops
40h 46mSIN-DEN
S$ 571
6-3Thu
2 stops
49h 06mSIN-DEN
S$ 592
9-3Sun
3 stops
35h 51mSIN-DEN
S$ 715
10-3Mon
1 stopTurkish Airlines
33h 15mSIN-DEN
S$ 987
6-3Thu
1 stopTurkish Airlines
46h 15mSIN-DEN
S$ 1,020
6-3Thu
2 stopsChina Airlines
47h 47mSIN-DEN
S$ 1,566
5-3Wed
2 stopsCathay Pacific
32h 55mSIN-DEN
S$ 1,912
5-3Wed
1 stopLufthansa
33h 25mSIN-DEN
S$ 3,006
9-3Sun
1 stopLufthansa
33h 25mSIN-DEN
S$ 3,010

Search by stops

Search by airline

Search by price

Everything you need to know for your flight to Boulder

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