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Cheap flights from Washington to Singapore from $281

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Washington to Singapore departing on 3/27. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Cheap round-trip flights

Enter your travel dates to find the best prices.
Singapore Airlines Logo
10:15 am - 5:35 pm
SEA
-
SIN
16h 20mnonstop
Singapore Airlines Logo
9:00 am - 8:45 am
SIN
-
SEA
14h 45mnonstop
$525Singapore Airlines
Tue, Apr 14 - Tue, May 5
Singapore Airlines Logo
10:15 am - 5:35 pm
SEA
-
SIN
16h 20mnonstop
Singapore Airlines Logo
9:00 am - 8:45 am
SIN
-
SEA
14h 45mnonstop
$527Singapore Airlines
Tue, Apr 7 - Fri, Apr 24
Singapore Airlines Logo
10:15 am - 5:35 pm
SEA
-
SIN
16h 20mnonstop
Singapore Airlines Logo
9:00 am - 8:45 am
SIN
-
SEA
14h 45mnonstop
$553Singapore Airlines
Sun, May 3 - Sat, May 16
United Airlines Logo
7:12 am - 6:35 pm
SEA
-
SIN
20h 23m
1 stop
United Airlines Logo
8:35 pm - 10:39 am
SIN
-
SEA
29h 04m
1 stop
$613United Airlines
Thu, Apr 9 - Thu, Apr 23
United Airlines Logo
7:12 am - 6:35 pm
SEA
-
SIN
20h 23m
1 stop
United Airlines Logo
9:00 am - 6:35 pm
SIN
-
SEA
24h 35m
1 stop
$614United Airlines
Thu, Apr 9 - Thu, Apr 16
Multiple Airlines Logo
1:36 pm - 9:35 am
PDX
-
SIN
28h 59m
2 stops
Multiple Airlines Logo
11:55 pm - 6:47 pm
SIN
-
PDX
33h 52m
2 stops
$903Multiple Airlines
Wed, Mar 11 - Tue, Mar 17
Cathay Pacific Logo
9:30 pm - 5:40 am
PDX
-
SIN
41h 10m
2 stops
Cathay Pacific Logo
8:15 pm - 9:50 am
SIN
-
PDX
28h 35m
2 stops
$922Cathay Pacific
Sun, Mar 8 - Wed, Mar 18
Multiple Airlines Logo
9:30 pm - 12:40 pm
PDX
-
SIN
24h 10m
2 stops
Multiple Airlines Logo
2:00 pm - 9:46 am
SIN
-
PDX
34h 46m
2 stops
$933Multiple Airlines
Sat, Aug 15 - Mon, Aug 31
Cathay Pacific Logo
7:05 am - 12:25 am
PDX
-
SIN
26h 20m
2 stops
Cathay Pacific Logo
4:45 pm - 9:50 am
SIN
-
PDX
32h 05m
2 stops
$937Cathay Pacific
Wed, Mar 11 - Tue, Mar 17
STARLUX Airlines Logo
5:30 pm - 12:40 pm
PDX
-
SIN
28h 10m
2 stops
STARLUX Airlines Logo
2:00 pm - 12:10 am
SIN
-
PDX
25h 10m
2 stops
$942STARLUX Airlines
Sat, Aug 15 - Mon, Aug 31

United Airlines flights from State of Washington to Singapore

Our best United Airlines deals on State of Washington to Singapore flight tickets
United Airlines
Apr 9
SEA7:12 amSeattle/Tacoma Intl
20h 23m
1 stop
SIN6:35 pmSingapore Changi
Apr 23
SIN8:35 pmSingapore Changi
29h 04m
1 stop
SEA10:39 amSeattle/Tacoma Intl
$613
United Airlines
Apr 9
SEA7:12 amSeattle/Tacoma Intl
20h 23m
1 stop
SIN6:35 pmSingapore Changi
Apr 16
SIN9:00 amSingapore Changi
24h 35m
1 stop
SEA6:35 pmSeattle/Tacoma Intl
$614
United Airlines
Aug 23
SEA5:15 amSeattle/Tacoma Intl
22h 20m
1 stop
SIN6:35 pmSingapore Changi
Sep 4
SIN11:05 amSingapore Changi
18h 20m
1 stop
SEA2:25 pmSeattle/Tacoma Intl
$621

Philippine Airlines flights from State of Washington to Singapore

Our best Philippine Airlines deals on State of Washington to Singapore flight tickets
Philippine Airlines
May 19
SEA11:10 pmSeattle/Tacoma Intl
23h 05m
1 stop
SIN1:15 pmSingapore Changi
Jun 3
SIN2:30 pmSingapore Changi
20h 35m
1 stop
SEA8:05 pmSeattle/Tacoma Intl
$695
Philippine Airlines
Mar 11
SEA10:30 pmSeattle/Tacoma Intl
23h 30m
1 stop
SIN1:00 pmSingapore Changi
Mar 25
SIN2:10 pmSingapore Changi
20h 30m
1 stop
SEA7:40 pmSeattle/Tacoma Intl
$696
Philippine Airlines
Mar 11
SEA10:30 pmSeattle/Tacoma Intl
20h 05m
1 stop
SIN9:35 amSingapore Changi
Mar 17
SIN10:35 amSingapore Changi
24h 05m
1 stop
SEA7:40 pmSeattle/Tacoma Intl
$841

momondo Fare Finder

 
Customize your flight search to find flights from State of Washington to Singapore that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated February 25, 2026.
Use the filters below to find and compare flights from Washington to Singapore that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

SeattleSingapore

SEA - SIN

SEASIN

Seattle/Tacoma Intl

Tue 4/14

10:15 am-5:35 pm

Nonstop16h 20m

Singapore Changi

Tue 5/5

9:00 am-8:45 am

Nonstop14h 45m

$525

SeattleSingapore

SEA - SIN

SEASIN

Seattle/Tacoma Intl

Tue 4/7

10:15 am-5:35 pm

Nonstop16h 20m

Singapore Changi

Fri 4/24

9:00 am-8:45 am

Nonstop14h 45m

$527

SeattleSingapore

SEA - SIN

SEASIN

Seattle/Tacoma Intl

Sun 5/3

10:15 am-5:35 pm

Nonstop16h 20m

Singapore Changi

Sat 5/16

9:00 am-8:45 am

Nonstop14h 45m

$553

SeattleSingapore

SEA - SIN

SEASIN

Seattle/Tacoma Intl

Thu 4/9

7:12 am-6:35 pm

1 stop20h 23m

Singapore Changi

Thu 4/23

8:35 pm-10:39 am

1 stop29h 04m

$613

SeattleSingapore

SEA - SIN

SEASIN

Seattle/Tacoma Intl

Thu 4/9

7:12 am-6:35 pm

1 stop20h 23m

Singapore Changi

Thu 4/16

9:00 am-6:35 pm

1 stop24h 35m

$614

PortlandSingapore

PDX - SIN

PDXSIN

Portland

Wed 3/11

1:36 pm-9:35 am

2 stops28h 59m

Singapore Changi

Tue 3/17

11:55 pm-6:47 pm

2 stops33h 52m

$903

PortlandSingapore

PDX - SIN

PDXSIN

Portland

Sun 3/8

9:30 pm-5:40 am

2 stops41h 10m

Singapore Changi

Wed 3/18

8:15 pm-9:50 am

2 stops28h 35m

$922

PortlandSingapore

PDX - SIN

PDXSIN

Portland

Sat 8/15

9:30 pm-12:40 pm

2 stops24h 10m

Singapore Changi

Mon 8/31

2:00 pm-9:46 am

2 stops34h 46m

$933

PortlandSingapore

PDX - SIN

PDXSIN

Portland

Wed 3/11

7:05 am-12:25 am

2 stops26h 20m

Singapore Changi

Tue 3/17

4:45 pm-9:50 am

2 stops32h 05m

$937

PortlandSingapore

PDX - SIN

PDXSIN

Portland

Sat 8/15

5:30 pm-12:40 pm

2 stops28h 10m

Singapore Changi

Mon 8/31

2:00 pm-12:10 am

2 stops25h 10m

$942

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Singapore from

How to get the cheapest flight ticket from State of Washington to Singapore

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to Singapore?

The month of September is, on average, the cheapest month to fly to Singapore from State of Washington, with most prices found around $708. If you aren’t able to travel to Singapore during the month of September, then flying in October is also cheap. Prices for this month can be found on momondo for an average of $725.

What is the cheapest day to depart on your flight to Singapore?

The cheapest day to depart from State of Washington to Singapore is on a Tuesday when prices can be found for as low as $926. The most expensive day to fly to Singapore is Wednesday, with ticket prices averaging around $1,164.

What is the cheapest Washington to Singapore Changi flight route?

Fly from Seattle/Tacoma Intl to Singapore Changi for the best Washington - Singapore Changi flight prices

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

You are more likely to see cheaper flights to Singapore from State of Washington when booking weeks ahead of your departure date. In general, you can expect to find flights to Singapore for around $877 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Singapore from State of Washington for as low as $776 on momondo.

What cabin class options are available on Washington to Singapore Changi flights?

There are 3 cabin classes available to choose from on Washington to Singapore Changi flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on State of Washington to Singapore flights?

No. A direct flight is the cheapest option for a flight between State of Washington to Singapore.

Cheap State of Washington to Singapore flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from State of Washington to Singapore

Best Price Found

$301

Fastest flight time

16h 20m

Direct flights

Mon, Wed, Fri, Sat and Sun

Airports in Singapore

1 airport
The best one-way flight to Singapore from State of Washington in the past 72 hours is $301. The best round-trip flight deal from State of Washington to Singapore found on momondo in the last 72 hours is $608.
The fastest flight from State of Washington to Singapore takes 16h 20m
Direct flights go from State of Washington to Singapore on Monday, Wednesday, Friday, Saturday and Sunday. The only airline offering direct flights is Singapore Airlines.
There is 1 airport in Singapore. From State of Washington there are direct flights to Singapore Changi (SIN).
Search flight deals

  • When did momondo last update prices for flights from Washington to Singapore Changi Airport?

    Prices for flights from Washington to Singapore Changi Airport are updated daily.

  • How many operators does momondo search for flights from Washington to Singapore Changi Airport?

  • How old do you have to be to fly from Washington to Singapore Changi Airport?

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Washington to Singapore Changi Airport.

  • What documentation or ID do you need to fly to Singapore Changi Airport?

    The required travel and health documents for your Singapore Changi Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Singapore Changi Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

  • What is the most popular plane model from State of Washington to Singapore?

Best airlines flying from State of Washington to Singapore

Compare and see reviews for airlines that fly from State of Washington to Singapore with momondo
Airline
Rating
Free Cancellation
Price
Singapore AirlinesPriceFrom $543Free CancellationRating
8.2
1,463 reviews
Search Singapore Airlines flights
Philippine AirlinesPriceFrom $650Free CancellationRating
7.2
959 reviews
Search Philippine Airlines flights
Asiana AirlinesPriceFrom $668Free CancellationRating
8.1
502 reviews
Search Asiana Airlines flights
Air CanadaPriceFrom $711Free CancellationRating
7.1
10,747 reviews
Search Air Canada flights
United AirlinesPriceFrom $742Free CancellationRating
7.4
9,348 reviews
Search United Airlines flights
DeltaPriceFrom $754Free CancellationRating
7.9
8,237 reviews
Search Delta flights
Korean AirPriceFrom $755Free CancellationRating
8.4
1,195 reviews
Search Korean Air flights
Japan AirlinesPriceFrom $792Free CancellationRating
8.3
1,714 reviews
Search Japan Airlines flights
ANAPriceFrom $802Free CancellationRating
8.4
1,101 reviews
Search ANA flights
China AirlinesPriceFrom $933Free CancellationRating
8.3
808 reviews
Search China Airlines flights

Why use momondo?

Why should I use momondo to find a flight deal from Washington to Singapore?

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Washington to Singapore. Millions of users trust and use momondo every year so you are in good hands.

Can I find flights from Washington to Singapore with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to Singapore from Washington with this policy.

How can momondo help me find flights from Washington to Singapore?

Once you have performed a search for Washington to Singapore flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

I’m not ready to book a flight from Washington to Singapore right now. Can momondo alert me if prices change?

If you are not ready to book a flight from Washington to Singapore now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Singapore and let you know when they change.

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Airlines are sorted and displayed according to clicks in the past 7 days on momondo
Singapore Airlines
United Airlines
Air Canada
Korean Air
Asiana Airlines
Delta
Philippine Airlines
ANA
EVA Air
China Airlines
Japan Airlines