$417 Find Cheap Flights from Portland to Singapore

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 Singapore departing on 11/2. 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
1 adult, Economy, 0 bags

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Book Cheap Portland to Singapore Plane Tickets

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Portland to Singapore 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.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Portland to Singapore

Tue, Oct 20 - Tue, Nov 17
Singapore Airlines Logo
7:15 am - 7:10 pm
PDX
-
SIN
20h 55m
1 stop
Singapore Airlines Logo
9:00 am - 1:14 pm
SIN
-
PDX
20h 14m
1 stop
$860Singapore Airlines
Thu, Aug 27 - Thu, Sep 10
Air Canada Logo
10:10 am - 5:15 am
PDX
-
SIN
28h 05m
1 stop
Air Canada Logo
7:00 am - 9:31 am
SIN
-
PDX
17h 31m
1 stop
$952Air Canada
Mon, Aug 17 - Tue, Sep 1
Singapore Airlines Logo
7:19 am - 7:10 pm
PDX
-
SIN
20h 51m
1 stop
Singapore Airlines Logo
9:05 am - 4:50 pm
SIN
-
PDX
22h 45m
1 stop
$953Singapore Airlines
Tue, Nov 10 - Tue, Dec 8
Singapore Airlines Logo
6:00 pm - 7:55 am
PDX
-
SIN
21h 55m
1 stop
Singapore Airlines Logo
9:00 am - 10:50 am
SIN
-
PDX
17h 50m
1 stop
$957Singapore Airlines
Thu, Nov 12 - Tue, Dec 8
Air Canada Logo
7:00 am - 7:00 am
PDX
-
SIN
32h 00m
1 stop
Air Canada Logo
8:50 am - 8:46 pm
SIN
-
PDX
27h 56m
1 stop
$972Air Canada
Tue, Nov 10 - Tue, Dec 8
Multiple Airlines Logo
2:45 pm - 7:55 am
PDX
-
SIN
25h 10m
1 stop
Multiple Airlines Logo
9:00 am - 10:50 am
SIN
-
PDX
17h 50m
1 stop
$980Multiple Airlines
Thu, Oct 1 - Sat, Oct 10
Singapore Airlines Logo
7:03 am - 7:10 pm
PDX
-
SIN
21h 07m
1 stop
Singapore Airlines Logo
9:00 am - 5:00 pm
SIN
-
PDX
23h 00m
1 stop
$984Singapore Airlines
Tue, Dec 1 - Fri, Dec 18
Multiple Airlines Logo
11:57 am - 5:45 pm
PDX
-
SIN
37h 48m
1 stop
Multiple Airlines Logo
9:00 am - 1:50 pm
SIN
-
PDX
20h 50m
1 stop
$991Multiple Airlines
Wed, Sep 2 - Sun, Sep 13
Multiple Airlines Logo
7:03 am - 7:10 pm
PDX
-
SIN
21h 07m
1 stop
Multiple Airlines Logo
9:05 am - 1:50 pm
SIN
-
PDX
19h 45m
1 stop
$994Multiple Airlines
Wed, Aug 26 - Tue, Sep 8
Multiple Airlines Logo
7:03 am - 5:25 am
PDX
-
SIN
31h 22m
2 stops
Multiple Airlines Logo
12:55 am - 4:36 pm
SIN
-
PDX
30h 41m
2 stops
$997Multiple Airlines
Booking Insights

KAYAK's insights & trends for Portland to Singapore flights

Get data-powered insights and trends into flights from Portland to Singapore to help you find the cheapest flights, the best time to fly and much more.

What is the cheapest month to fly from Portland to Singapore?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Portland to Singapore, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Portland to Singapore is August, when tickets cost $209 (return) on average. On the other hand, the most expensive months are June and July, when the average cost of round-trip tickets is $950 and $862 respectively.

How far in advance should I book a flight from Portland to Singapore?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Portland to Singapore, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from Portland to Singapore, you should book around 2 weeks before departure, which saves you about 28% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 19 weeks before departure.

Good to know

Low seasonMay
Cheapest flight$417
Best time to beat the crowds with an average 14% drop in price.
Most popular time to fly with an average 1% increase in price.
Flight from Portland to Singapore

FAQs - booking Singapore flights

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

    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 Singapore.

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

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

    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 Portland to Singapore 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 Portland to Singapore?

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

Reviews of the top 3 airlines serving from Portland to Singapore

 
Need help choosing which airline to fly with from Portland to Singapore? 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.
8.2
Singapore AirlinesOverall score based on 1532 reviews
8.1Entertainment
8.6Crew
8.0Comfort
8.3Boarding
7.8Food
Airline reviews

Very concerned with guest comforts going out of their way to accommodate special dietary needs when the guests hadn’t pre-ordered.

10.0 ExcellentVerak, May 2026
SFO - SIN
Read more Singapore Airlines reviews

Very concerned with guest comforts going out of their way to accommodate special dietary needs when the guests hadn’t pre-ordered.

Kayak really screwed up by offloading the booking to a third party. They were completely inept and caused a bunch of toil. I will never use Kayak again.

I had ordered vegetarian food. What I was presented was extremely dissatisfying and not up to the mark. I pretty much did not eat entire 19 hours. For.an airline voted as best in business, it was extremely disappointing. Seats were not comfortable to sleep. Entertainment system didn’t have much choice. WiFi didn’t work for more than half the time. Cabin crew were also difficult to understand. A bit of diversity like Emirates crew would go a long way.

A little more room from the reclining seat in the front of me.

It was okay. I feel that Singapore Airlines isn't as good as it used to be but it's still not bad

It was fine. Nothing special but nothing went wrong so all good.

Overall the airline tried to give excellent service. The wheelchair service was bad at SFO. My baggage was also delayed but I thank them for taking the trouble to find it and deliver it to my home.

I felt that the whole experience went very smoothly. The aircraft was extremely clean and tidy on boarding. The cabin crew were beautifully turned out very, very efficient and were a credit to Singapore Airlines who are now my favourite carrier.

Excellent crew service. Professional, courteous. Service with a smile. Good food Very decent flight experience

Overall were very good and I was satisfied w/ all the food and services.

Even through the flight was delayed due to storms near IAH The flight was great! The crew was so hospitable and professional

I flew from Santa Fe to Denver to catch a flight to London and the transfer of my luggage on arrival at Denver to the London flight worked perfectly. The crew on the ground and on board for the London flight were so friendly and efficient.

Boarded early; and arrived home 40 mins early. After a long flight, it’s nice to be back home early. These flights have no amenities; no snacks. So need to bring your own

Boarded early, left early, arrived 40 mins early! A win win for me!

New plane was lovely. Crew customer service is always lax but expected. Kraft on time and arrived safely.

These airplanes should be illegal. The seats are two tight, it is a safety issue. Wheelchair support was ridiculously slow. We almost missed our flight.

It was a short flight so I was expecting too much

Horrifying Almost 2 million miles. Bring your own food and drink. One coffee or drink every three hours. Have to order meals on app more than 24 hours ahead Tiny and dirty bathrooms

Flight was delayed but more than 90 minutes. This caused me to miss my available windows for pick-up by a friend. I had to pay $125 for an uber back home from the airport which was an added expense that I had not budgeted for my trip. Staff was friendly.

I felt scammed. The priced advertised was different than what I paid. I paid the whole some online. I then got a call 20 minutes later saying I need to paid 70 more person. She said the price online is not the guaranteed price.

No TV on the flight. The charging outlet was not working. No food, even a sandwich. The served orange was poor quality.

Selected seats 5 months prior to date. Had email confirmation and seats were not honoured. Family did not sit together

Loved and was pleasantly surprised by the food!! Request Lufthansa to help transiting passengers at Munich (confusion whether to go thru passport control or not).

The flight was comfortable and the staff were helpful and friendly. However, we did not know we were flying PAL until we arrived in Canada, so it was a bit disconcerting. In addition, which port we were leaving from was confusing.

Disappointing experience with the cabin crews on this Air Canada flight. Some crew members came across as quite rude, and one bumped into my arm without even acknowledging it or apologising. A little courtesy and kindness would have gone a long way. Air turbulence is understandable. Human turbulence from the crew, less so.

They did not let us board because one member needed a transit visa, which was not evident at the time of ticket purchase.

I was charge a baggage checking fee $68!! I volunteered to check my duffle bag which usually goes under my seat!

I did not like anything because the flight was cancelled yesterday and I did not get to arrive on time in Toronto as I was rebooked with another airline. This caused me to be really stressed out as I am an individual with back injury and to be forced to stay longer in an airport to accommodate a change of airline and the transfers associated with it Due to this I am probably not going to book through your website to eliminate this potentially chaos in the future

shittiest airline in the hemisphere. To improve - start thinking you're flying people, not cattle

Easy boarding, inflight refreshments came on time and comfortable seat

Everything you need to know for your flight from Portland to Singapore

Information on your arrival and departure airports