$451 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 8/19. 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

Fri, Sep 18 - Sat, Oct 3
Singapore Airlines Logo
6:20 am - 5:35 pm
PDX
-
SIN
20h 15m
1 stop
Singapore Airlines Logo
9:00 am - 1:27 pm
SIN
-
PDX
19h 27m
1 stop
$932Singapore Airlines
Sat, Oct 31 - Sat, Nov 14
Singapore Airlines Logo
6:06 am - 5:45 pm
PDX
-
SIN
20h 39m
1 stop
Singapore Airlines Logo
9:00 am - 4:50 pm
SIN
-
PDX
23h 50m
1 stop
$935Singapore Airlines
Tue, Oct 27 - Thu, Nov 12
Singapore Airlines Logo
6:06 am - 5:45 pm
PDX
-
SIN
20h 39m
1 stop
Singapore Airlines Logo
9:15 am - 8:50 pm
SIN
-
PDX
27h 35m
1 stop
$944Singapore Airlines
Fri, Sep 11 - Sun, Sep 27
Air Canada Logo
3:30 pm - 5:15 am
PDX
-
SIN
22h 45m
1 stop
Air Canada Logo
7:00 am - 7:06 pm
SIN
-
PDX
27h 06m
1 stop
$945Air Canada
Fri, Sep 18 - Sat, Oct 3
Singapore Airlines Logo
6:20 am - 5:35 pm
PDX
-
SIN
20h 15m
1 stop
Singapore Airlines Logo
9:00 am - 5:00 pm
SIN
-
PDX
23h 00m
1 stop
$950Singapore Airlines
Tue, Aug 11 - Thu, Sep 10
Air Canada Logo
10:10 am - 5:15 am
PDX
-
SIN
28h 05m
1 stop
Air Canada Logo
7:00 am - 2:51 pm
SIN
-
PDX
22h 51m
1 stop
$952Air Canada
Sun, Sep 20 - Thu, Sep 24
Singapore Airlines Logo
3:33 pm - 5:15 am
PDX
-
SIN
22h 42m
1 stop
Singapore Airlines Logo
9:00 am - 1:37 pm
SIN
-
PDX
19h 37m
1 stop
$957Singapore Airlines
Sun, Sep 27 - Tue, Oct 20
Singapore Airlines Logo
5:38 pm - 7:40 am
PDX
-
SIN
23h 02m
1 stop
Singapore Airlines Logo
9:00 am - 1:27 pm
SIN
-
PDX
19h 27m
1 stop
$960Singapore Airlines
Tue, Oct 27 - Tue, Nov 10
Air Canada Logo
7:10 pm - 7:00 am
PDX
-
SIN
20h 50m
1 stop
Air Canada Logo
8:50 am - 9:26 am
SIN
-
PDX
16h 36m
1 stop
$972Air Canada
Wed, Sep 23 - Thu, Oct 1
Singapore Airlines Logo
7:03 am - 7:10 pm
PDX
-
SIN
21h 07m
1 stop
Singapore Airlines Logo
9:00 am - 7:50 pm
SIN
-
PDX
25h 50m
1 stop
$976Singapore 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 September, when tickets cost $693 (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$451
Best time to beat the crowds with an average 13% 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 1525 reviews
8.6Crew
8.3Boarding
8.1Entertainment
8.0Comfort
7.8Food
Airline reviews

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.

2.0 MediocreJeff, Apr 2026
MDC - SIN
Read more Singapore Airlines reviews

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.

Service was very good, food and entertainment systems were good

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.

Seat pitch is horrible especially on the 15 hour flight. Gate crew at SFO was Outstanding. The flight crew was also great.

Easy of boarding, helpfully staff at check in, surprisingly comfortable seating

Check in was chaotic with only one counter for business class and first class. The luggage conveyor belt at JFK airport was broken so the flight departure was delayed which made the flight stressful as I had a tight connection. Although the captain said they could make up the delay, they didn’t do so.

Had a one hour delay due to mechanical issue. I didn’t think I’d be able to make my connecting flight, but they waited for me and greeted me when I arrived to help things run smooth.

Lost of requested seat assignments. Lost my husband's meal choice

6 1/2 hours from Tampa to SFO on a Boeing 737. Cramped. No Service. No real food. One pass for coffee at the beginning and a second pass THREE hours later. And check-in in Tampa was nasty even by United standards. And I am at almost TWO million miles on United. It's a non-stop. But terrible service.

MY FAMILY'S LUGGAGE WAS LOST FROM ROME TO BARI. I WAS THE ONLY ONE THAT RECEIVED MY LUGGAGE FROM ROME TO BARI. AFTER DEPLANING IN BARI, WE WASTED A LOT OF TIME AT BAG CLAIMS LOST AND FOUND REPORTING THE CLAIM AND PLEADING FOR THE BAGS TO BE DELIVERED THE NEXT DAY. WE WERE TOLD THAT IT TAKES 3 DAYS MINIMUM TO DELIVER. MY DAUGHTER AND MY GIRLFRIEND NEEDED THEIR PERSONAL THINGS AND WE WERE STAYING 3 HOURS AWAY FROM THE BARI AIRPORT. WE HAD TO DRIVE 3 HOURS TO THE AIRPORT TO COLLECT OUR LOST LUGGAGE THE NEXT DAY. WE ARE NOT HAPPY WITH THE EXPERIENCE

We had a delay, but thankfully I made it to my connection. Overall it went smooth

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

It was good that our flight left early. It was a nice smooth flight and landing.

All good……but luggage didn’t make it on the airplane. Had to wait 3 days. Was a bummer.

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

Information on your arrival and departure airports