$413 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 8/6. 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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Flight Deals

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

Mon, Aug 17 - Tue, Sep 1
United Airlines Logo
11:15 am - 6:15 am
PDX
-
SIN
28h 00m
1 stop
United Airlines Logo
8:35 pm - 10:11 am
SIN
-
PDX
28h 36m
1 stop
$891United Airlines
Tue, Nov 3 - Tue, Nov 17
United Airlines Logo
7:07 pm - 8:15 pm
PDX
-
SIN
33h 08m
2 stops
United Airlines Logo
10:10 am - 9:08 pm
SIN
-
PDX
26h 58m
2 stops
$895United Airlines
Sun, Sep 6 - Mon, Oct 19
United Airlines Logo
7:15 pm - 6:35 pm
PDX
-
SIN
32h 20m
1 stop
United Airlines Logo
8:45 am - 2:27 pm
SIN
-
PDX
20h 42m
1 stop
$897United Airlines
Tue, Aug 25 - Mon, Sep 7
United Airlines Logo
12:45 pm - 6:15 am
PDX
-
SIN
26h 30m
2 stops
United Airlines Logo
11:05 am - 10:45 pm
SIN
-
PDX
26h 40m
2 stops
$906United Airlines
Thu, Nov 12 - Mon, Dec 7
United Airlines Logo
5:30 am - 12:55 am
PDX
-
SIN
27h 25m
2 stops
United Airlines Logo
10:10 am - 12:54 am
SIN
-
PDX
30h 44m
1 stop
$908United Airlines
Thu, Nov 12 - Thu, Dec 10
ANA Logo
5:30 am - 12:55 am
PDX
-
SIN
27h 25m
2 stops
ANA Logo
6:35 am - 6:31 pm
SIN
-
PDX
27h 56m
2 stops
$912ANA
Wed, Nov 11 - Tue, Dec 8
Air Canada Logo
10:00 am - 7:00 am
PDX
-
SIN
29h 00m
1 stop
Air Canada Logo
8:40 am - 9:26 am
SIN
-
PDX
16h 46m
1 stop
$918Air Canada
Thu, Nov 12 - Mon, Dec 7
United Airlines Logo
6:53 am - 12:55 am
PDX
-
SIN
26h 02m
2 stops
United Airlines Logo
10:10 am - 1:15 pm
SIN
-
PDX
43h 05m
2 stops
$919United Airlines
Sat, Aug 15 - Mon, Aug 31
United Airlines Logo
7:00 am - 6:35 pm
PDX
-
SIN
20h 35m
1 stop
United Airlines Logo
8:45 am - 8:59 pm
SIN
-
PDX
27h 14m
1 stop
$925United Airlines
Sun, Sep 6 - Mon, Oct 19
United Airlines Logo
10:50 am - 6:15 am
PDX
-
SIN
28h 25m
2 stops
United Airlines Logo
8:35 pm - 12:59 am
SIN
-
PDX
19h 24m
1 stop
$929United 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 27% 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$413
Best time to beat the crowds with an average 10% drop 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 1555 reviews
8.0Comfort
8.6Crew
7.8Food
8.3Boarding
8.1Entertainment
Airline reviews

I had selected seats together for my family of three when I first booked my tickets in February. However, I realized only when I checked in at the airport that the seats I had selected were no longer assigned to us and we were completely scattered across three different middle seats instead of being seated together! After requesting the Singapore staff to have us seated together on a full flight, they managed to find something but it was right next to the rest rooms and the whole journey of 15+ hours was really unpleasant. They said that the seat selection isn't locked and the airline can reallocate the seats anytime. No one ever told us this and it was a terribly unpleasant surprise. Will avoid Kayak/underpricer and Singapore in future

2.0 MediocreAnonymous, Jun 2026
SFO - SIN
Read more Singapore Airlines reviews

I had selected seats together for my family of three when I first booked my tickets in February. However, I realized only when I checked in at the airport that the seats I had selected were no longer assigned to us and we were completely scattered across three different middle seats instead of being seated together! After requesting the Singapore staff to have us seated together on a full flight, they managed to find something but it was right next to the rest rooms and the whole journey of 15+ hours was really unpleasant. They said that the seat selection isn't locked and the airline can reallocate the seats anytime. No one ever told us this and it was a terribly unpleasant surprise. Will avoid Kayak/underpricer and Singapore in future

Flight attendants were awesome! Very helpful and patients. Some food were good but maybe not serving fish that kinda make the whole aircraft smell fishy. The “fried pork” was tasty but too much skin so it doesnt taste that great.

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

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.

I wish there was a little more leg room between the seats. The recline was good and seats overall were comfortable. I also didn’t like the 2-4-2 configuration.

toilets could be cleaned more frequently, everything else was pretty good.

Wish the underseat compartment don’t have a restriction, can fit a personal item such as backpack fully like most Boeing

Crew and service excellent. 2 hour delay for takeoff. SQ app showed flight on time.

Construction at PDX resulting in very lung walk from the rental car to the gate. SFO, extremely long walk between terminals to get to connecting Singapore airlines flight. My smart watch recorded a total of 3 miles.

the whole trip was smooth, and as comfortable as flying is these days. flight crew was friendly and very courteous and helpful.

Yet another flight in which beverage and snack service was skipped. Other that that, firmly mediocre. Landed early, to gate late due to congestion at the gates. Airline's fault or airports fault: unknown.

The flights were on time which was great give. It was holiday travel season and there’d been some weather issues. The only complaint and this is every time with United is the terrible seat design. The head rest is not built for comfort and having my neck bent forward for a cross country trip reminded me while I try not to take United flights as a rule.

This was a very average flight. The seat was out of alignment so more uncomfortable than usual. The cabin felt not well maintained. But I safely got where I needed to go.

We had a 90 minute delay due to equipment failure that was detected just before we took off. United rebooked my connecting flight.

Dinner was okay but the breakfast was not eatable on the flight San Francisco to Zurich.

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

Poor seating comfort, seat cushion too thin, very uncomfortable. My luggage didi not make the flight due to equipment change. At least. United had it delivered the next day. I was without my toilet items for one day.

Flight cancelled because of the grounded 737s. United was good about it and got us onto a later Alaska Airlines flight to Oakland (not San Francisco as originally intended). Had to go through security again and my wife dropped her MacBook Pro, which broke, a $2,500 whoopsie. But we made it home.

I liked being upgraded to first class. The flight was a redeye, so I did sleep most of it.

It was pretty straight forward, no glitches or hidden costs

The whole plane smelled and felt old. The seats were very uncomfortable. Multiple delays. Extra fees.

For goodness sake, board from the back of the plane to the front and assign overhead space. It would fix everything. Seriously.

Aircraft had technical issues. After 3 hours of trying to resolve, flight was cancelled. Was booked on a flight leaving 12 hours after intended departure. Now on 4 flights instead of 2 and a day late to my destination.

PDX staff was great and we arrived on time in YVR.

Horrible I had a health emergency and couldn’t go Air Canada refused to allow me to reschedule

Really poor travel experience. My first flight was cancelled, which cut my international trip short and threw off my schedule. I will not be flying Air Canada again if I can so help it. The crew and in-flight experience was pleasant and enjoyable but the consistent delays and cancellations are not worth it.

Economy middle seat was so narrow that I could not sit back comfortably with passengers on either side of me. Over the 9-hour flight, with my body slightly twisted most of that time, my previously-healthy left knee became very painful, even though I got up to walk multiple times. The knee is still painful 3 weeks later. Otherwise, it was a nice flight, but I was crippled over my entire vacation.

The staff were condescending and withheld at times. There were times when they appeared to be more concerned with socializing with each other than appearing professional. I know it must be a hard job, but being chatty and handsy with each other in the public view only to be condescending to customers isn’t a good look.

No entertainment what’s so ever so you may want to prepare yourself. Our flight was delayed.

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

Information on your arrival and departure airports