What are the cheapest airlines to fly from Washington, D.C. to Singapore one-way?

The cheapest airlines for a one-way flight from Washington, D.C. to Singapore are Air India ($406), Turkish Airlines ($455), and Cathay Pacific ($508).

What are the most popular routes from Washington, D.C. to Singapore?

The most popular route from Washington, D.C. to Singapore is Washington, D.C. Dulles Intl - Singapore Changi. You may also consider Washington, D.C. Reagan-National - Singapore Changi or Baltimore/Washington - Singapore Changi.

What are the most popular airlines that fly from Washington, D.C. to Singapore?

When booking a flight from Washington, D.C. to Singapore, you may want to consider flying on American Airlines, Air Canada or JetBlue as they are the most popular for this route.

How far in advance should I book a flight from Washington, D.C. to Singapore?

To save up to 6% on this flight, we recommend booking at least 61 days prior to travel. The price may fluctuate and will likely increase closer to your departure date. Users on Cheapflights have found tickets from Washington, D.C. to Singapore from $957 1-2 weeks out and tickets from $957 for flights departing within the next 72 hours.

What is the cheapest month to fly from Washington, D.C. to Singapore?

The best pricing can be found in the month of November. Prices to Singapore from Washington, D.C. average $1,282. You can even find prices in November for less than $1,282, as users have found deals to Singapore from as low as $816. The month of December appears to be one of the more expensive times to travel to Singapore from Washington, D.C.. Flying in the targeted month can save you up to 41%.

Can I find deals for flights from Washington, D.C. to Singapore that include hotel bookings?

Yes. In addition to deals on Washington, D.C. to Singapore flights, Cheapflights offers vacation packages that include both flights and hotel.

How can I find direct flights from Washington, D.C. to Singapore?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Washington, D.C. to Singapore.

Can I find deals for business class flights from Washington, D.C. to Singapore?

Yes. Cheapflights offers flight deals from Washington, D.C. to Singapore by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

$1,006+ Flights from Washington, D.C. to Singapore - Compare & Save Big

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Cheap flight deals from Washington, D.C. to Singapore

Most accurate provider	AranGrant 3 stars
Most trusted provider	AranGrant 3 stars
Round-trip from	$1,017 (FlightHub)
One-way from	$406 (oojo)
Popular in	December
Cheapest in	November
Average price	$1,269

Provider with most accurate pricing for Washington, D.C. (WAS)-Singapore Changi flight deals.

Search Deals

Provider most trusted by Cheapflights users for Washington, D.C. (WAS)-Singapore Changi flights.

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From Washington, D.C. (WAS) to Singapore

Search Deals

One-way flight from Washington, D.C. (WAS) to Singapore

Search Deals

Highest demand for flights based on searches. 2% potential increase in price ($29 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 3% potential price decrease ($49 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in May 2025

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Find flight deals from Washington, D.C. to Singapore

Cheapest flights from Washington, D.C. to Singapore
Explore the most affordable flight options available from Washington, D.C. to Singapore. Find the lowest fares from popular airlines and budget airlines, with prices last updated on May 1, 2025.

Sun 5/41:30 pmIAD - SIN

1 stop40h 25mTurkish Airlines

Fri 5/910:15 amSIN - IAD

1 stop37h 30mTurkish Airlines

Deal found 4/29

$1,012

Mon 5/51:30 pmIAD - SIN

1 stop31h 00mMultiple Airlines

Tue 5/207:45 pmSIN - IAD

2 stops36h 00mMultiple Airlines

Deal found 4/30

$1,013

Fri 5/1610:05 pmIAD - SIN

1 stop23h 35mEtihad Airways

Mon 5/269:10 pmSIN - IAD

1 stop31h 00mEtihad Airways

Deal found 4/30

$1,029

Thu 5/16:59 amDCA - SIN

2 stops60h 06mAir Canada

Wed 5/146:15 amSIN - DCA

2 stops45h 34mAir Canada

Deal found 4/30

$1,038

Wed 8/1311:00 amIAD - SIN

1 stop32h 30mAir India

Sat 8/308:30 pmSIN - IAD

1 stop23h 10mAir India

Deal found 4/30

$1,038

Mon 5/511:55 amDCA - SIN

2 stops29h 35mMultiple Airlines

Tue 5/208:00 amSIN - DCA

2 stops25h 34mMultiple Airlines

Deal found 4/30

$1,066

Sun 9/282:25 pmIAD - SIN

2 stops28h 40mAir Canada

Sat 10/189:10 amSIN - IAD

2 stops36h 28mAir Canada

Deal found 4/30

$1,072

Mon 11/38:05 pmIAD - SIN

2 stops27h 50mQatar Airways

Wed 11/52:00 amSIN - IAD

1 stop26h 55mQatar Airways

Deal found 4/30

$1,073

Thu 5/111:54 amDCA - SIN

2 stops35h 51mCathay Pacific

Tue 5/131:50 amSIN - DCA

2 stops29h 17mCathay Pacific

Deal found 4/30

$1,097

Fri 9/196:55 pmBWI - SIN

1 stop24h 55mSingapore Airlines

Mon 9/298:45 pmSIN - BWI

1 stop23h 21mSingapore Airlines

Deal found 4/28

$1,129

Sun 8/101:30 pmIAD - SIN

2 stops40h 15mIndiGo

Sun 8/317:45 pmSIN - IAD

2 stops36h 00mIndiGo

Deal found 4/30

$1,152

Mon 5/51:15 pmIAD - SIN

1 stop42h 40mKorean Air

Tue 5/2010:30 pmSIN - IAD

1 stop24h 45mKorean Air

Deal found 4/30

$1,155

Best flights from Washington, D.C. to Singapore
Discover carefully curated flight deals from Washington, D.C. to Singapore that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated May 1, 2025.

Wed 8/139:40 pmIAD - SIN

1 stop32h 15mTurkish Airlines

Tue 8/1910:15 amSIN - IAD

1 stop37h 30mTurkish Airlines

Deal found 4/30

$1,017

Sat 9/2011:00 amIAD - SIN

1 stop32h 30mMultiple Airlines

Sun 10/57:45 pmSIN - IAD

2 stops36h 00mMultiple Airlines

Deal found 4/28

$1,025

Wed 8/1311:00 amIAD - SIN

1 stop22h 45mAir India

Sat 8/308:30 pmSIN - IAD

1 stop23h 10mAir India

Deal found 4/29

$1,038

Sat 6/74:35 pmDCA - SIN

2 stops50h 30mAir Canada

Sat 6/149:10 amSIN - DCA

2 stops37h 09mAir Canada

Deal found 4/29

$1,088

Thu 9/189:00 pmIAD - SIN

2 stops35h 25mQatar Airways

Sun 9/283:10 amSIN - IAD

1 stop24h 30mQatar Airways

Deal found 4/29

$1,125

Mon 8/119:40 pmIAD - SIN

2 stops31h 40mIndiGo

Wed 8/277:45 pmSIN - IAD

2 stops36h 00mIndiGo

Deal found 4/29

$1,136

Wed 9/1710:05 pmIAD - SIN

1 stop23h 35mEtihad Airways

Sat 9/279:10 pmSIN - IAD

1 stop31h 00mEtihad Airways

Deal found 4/28

$1,138

Mon 9/11:15 pmIAD - SIN

1 stop42h 40mKorean Air

Tue 9/91:10 amSIN - IAD

1 stop21h 45mKorean Air

Deal found 4/29

$1,179

Wed 9/37:00 amDCA - SIN

1 stop23h 25mUnited Airlines

Wed 9/248:40 pmSIN - DCA

1 stop32h 16mUnited Airlines

Deal found 4/29

$1,194

Wed 9/179:40 pmIAD - SIN

2 stops29h 10mEthiopian Air

Sun 9/282:00 amSIN - IAD

2 stops30h 05mEthiopian Air

Deal found 4/28

$1,194

Mon 8/118:30 amDCA - SIN

2 stops34h 10mANA

Wed 8/2710:10 pmSIN - DCA

2 stops34h 53mANA

Deal found 4/29

$1,196

Fri 9/58:59 amDCA - SIN

1 stop32h 16mSingapore Airlines

Thu 9/118:45 pmSIN - DCA

1 stop36h 14mSingapore Airlines

Deal found 4/30

$1,204

Last-minute flights from Washington, D.C. to Singapore
Discover last-minute flight deals from Washington, D.C. to Singapore. Data last updated May 1, 2025 and is based on user searches.

Wed 4/304:00 pmIAD - SIN

2 stops26h 45mUnited Airlines

Wed 5/79:00 amSIN - IAD

2 stops23h 57mUnited Airlines

Deal found 4/29

$1,198

Thu 5/16:59 amDCA - SIN

2 stops60h 06mAir Canada

Wed 5/146:15 amSIN - DCA

2 stops45h 34mAir Canada

Deal found 4/30

$1,038

Thu 5/111:54 amDCA - SIN

2 stops35h 51mCathay Pacific

Tue 5/131:50 amSIN - DCA

2 stops29h 17mCathay Pacific

Deal found 4/30

$1,097

Thu 5/15:59 pmDCA - SIN

1 stop24h 46mLufthansa

Wed 5/149:00 amSIN - DCA

2 stops26h 59mLufthansa

Deal found 4/30

$1,199

Sun 5/41:30 pmIAD - SIN

1 stop40h 25mTurkish Airlines

Fri 5/910:15 amSIN - IAD

1 stop37h 30mTurkish Airlines

Deal found 4/29

$1,012

Mon 5/51:30 pmIAD - SIN

1 stop31h 00mMultiple Airlines

Tue 5/207:45 pmSIN - IAD

2 stops36h 00mMultiple Airlines

Deal found 4/30

$1,013

Mon 5/511:55 amDCA - SIN

2 stops29h 35mMultiple Airlines

Tue 5/208:00 amSIN - DCA

2 stops25h 34mMultiple Airlines

Deal found 4/30

$1,066

Mon 5/51:15 pmIAD - SIN

1 stop42h 40mKorean Air

Tue 5/2010:30 pmSIN - IAD

1 stop24h 45mKorean Air

Deal found 4/30

$1,155

Mon 5/55:59 pmDCA - SIN

1 stop24h 46mUnited Airlines

Tue 5/209:00 amSIN - DCA

1 stop24h 34mUnited Airlines

Deal found 4/30

$1,187

Mon 5/57:25 amIAD - SIN

2 stops33h 35mDelta

Tue 5/207:30 amSIN - IAD

2 stops28h 04mDelta

Deal found 4/30

$1,207

Mon 5/55:59 pmDCA - SIN

1 stop24h 46mAir Canada

Tue 5/208:40 pmSIN - DCA

2 stops24h 19mAir Canada

Deal found 4/30

$1,210

Mon 5/57:00 amBWI - SIN

2 stops34h 00mDelta

Tue 5/207:30 amSIN - BWI

2 stops28h 28mDelta

Deal found 4/30

$1,218

One-way flights from Washington, D.C. to Singapore
Search for one-way flight options from Washington, D.C. to Singapore. Find affordable one-way fares based on user searches. Data last updated May 1, 2025.

Wed 8/2011:00 amIAD - SIN

1 stop32h 30mAir India

Deal found 4/29

$406

Wed 5/149:40 pmIAD - SIN

1 stop32h 15mTurkish Airlines

Deal found 4/30

$455

Wed 8/2012:31 pmDCA - SIN

2 stops28h 59mCathay Pacific

Deal found 4/29

$508

Mon 5/266:45 pmIAD - SIN

3 stops55h 40mMultiple Airlines

Deal found 4/29

$562

Wed 6/49:30 pmBWI - SIN

2 stops48h 10mMultiple Airlines

Deal found 4/29

$571

Mon 7/281:30 pmIAD - SIN

2 stops39h 50mIndiGo

Deal found 4/29

$588

Mon 7/288:40 pmDCA - SIN

2 stops46h 25mAir Canada

Deal found 4/29

$602

Sun 5/256:00 pmDCA - SIN

3 stops56h 25mMultiple Airlines

Deal found 4/29

$664

Mon 7/216:44 pmIAD - SIN

2 stops37h 51mCathay Pacific

Deal found 4/30

$669

Mon 7/288:55 amBWI - SIN

1 stop33h 20mUnited Airlines

Deal found 4/29

$679

Mon 7/285:59 pmDCA - SIN

1 stop24h 16mUnited Airlines

Deal found 4/29

$679

Wed 7/166:35 amIAD - SIN

2 stops35h 40mUnited Airlines

Deal found 4/30

$679

Cheapflights Fare Finder

Use the filters below to find and compare flights from Washington, D.C. to Singapore that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Washington, D.C.Singapore

IAD - SIN

IADSIN

Washington, D.C. Dulles Intl

Wed 8/13

9:40 pm-5:55 pm

1 stop32h 15m

Singapore Changi

Tue 8/19

10:15 am-11:45 am

1 stop37h 30m

$1,017

Washington, D.C.Singapore

IAD - SIN

IADSIN

Washington, D.C. Dulles Intl

Fri 5/16

10:05 pm-9:40 am

1 stop23h 35m

Singapore Changi

Mon 5/26

9:10 pm-4:10 pm

1 stop31h 00m

$1,029

Washington, D.C.Singapore

DCA - SIN

DCASIN

Washington, D.C. Reagan-National

Wed 10/1

4:35 pm-7:05 am

2 stops50h 30m

Singapore Changi

Wed 10/15

6:15 am-9:51 pm

2 stops27h 36m

$1,038

Washington, D.C.Singapore

IAD - SIN

IADSIN

Washington, D.C. Dulles Intl

Wed 8/13

11:00 am-7:30 am

1 stop32h 30m

Singapore Changi

Sat 8/30

8:30 pm-7:40 am

1 stop23h 10m

$1,038

Washington, D.C.Singapore

IAD - SIN

IADSIN

Washington, D.C. Dulles Intl

Mon 8/25

11:51 am-11:45 am

2 stops35h 54m

Singapore Changi

Mon 9/1

1:50 am-9:21 pm

2 stops31h 31m

$1,053

Washington, D.C.Singapore

IAD - SIN

IADSIN

Washington, D.C. Dulles Intl

Sun 9/28

2:25 pm-7:05 am

2 stops28h 40m

Singapore Changi

Sat 10/18

9:10 am-9:38 am

2 stops36h 28m

$1,072

Washington, D.C.Singapore

IAD - SIN

IADSIN

Washington, D.C. Dulles Intl

Wed 10/1

9:00 pm-9:00 am

1 stop24h 00m

Singapore Changi

Wed 10/15

4:35 pm-4:10 pm

2 stops35h 35m

$1,102

BaltimoreSingapore

BWI - SIN

BWISIN

Baltimore/Washington

Fri 9/19

6:55 pm-7:50 am

1 stop24h 55m

Singapore Changi

Mon 9/29

8:45 pm-8:06 am

1 stop23h 21m

$1,129

Washington, D.C.Singapore

IAD - SIN

IADSIN

Washington, D.C. Dulles Intl

Sun 8/10

1:30 pm-5:45 pm

2 stops40h 15m

Singapore Changi

Sun 8/31

7:45 pm-7:45 pm

2 stops36h 00m

$1,152

Washington, D.C.Singapore

IAD - SIN

IADSIN

Washington, D.C. Dulles Intl

Wed 10/1

9:40 pm-2:50 pm

2 stops29h 10m

Singapore Changi

Tue 10/14

2:00 am-8:05 pm

2 stops30h 05m

$1,169

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/29

Showing 1-10 of 60 results

...

Best time to book a flight from Washington, D.C. to Singapore

Have a flexible travel schedule? Discover the best time to fly to Singapore from Washington, D.C. with our price prediction graph.

Estimated round-trip price

Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Washington, D.C. to Singapore

What is the cheapest month to book a flight from Washington, D.C. to Singapore?

Currently, September is the cheapest month in which you can book a flight from Washington, D.C. to Singapore (average of $1,011). Flying from Washington, D.C. to Singapore in December is currently the most expensive (average of $1,684). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from WAS to SG?

When flying from Washington, D.C. to Singapore, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Rainfall in Singapore by month

In terms of precipitation, rainfall in Singapore ranges from 5.9 - 10.6 inches per month. December is typically the wettest month, when rainfall can reach 10.6 in. July is typically the driest time to visit Singapore when rainfall is around 5.9 in.

Temperature in Singapore by month

If weather is an important factor for your trip to Singapore, use this chart to help with planning. For those seeking warmer temperatures, March is the ideal time of year to visit, when temperatures reach an average of 82.4 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 78.8 F).

Reviews of airlines servicing Singapore

See what other customers who have flown with Korean Air, Japan Airlines and China Airlines from Washington, D.C. to Singapore have to say. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.

Korean Air

8.4

Very good

1,069 reviews

Reviews

1 / 20

10.0

Excellent

Chris,Mar 2025

SEA - ICN

Was told the flight was overbooked so they selected only a few people to weight their bags and we were forced to check our luggage. We Once we got seated on the flight there were many seats vacant and our overhead bin was completely open. Both our luggage and our carryon were small. We had booked our tickets months in advance and we watched people carry two small suitcases on without one word to them. Am I upset?? Yes it was disappointing.

Korean Air

8.4

Very good

1,069 reviews

Korean Air

8.4

Very good

1,069 reviews

Reviews

1 / 20

10.0

Excellent

Chris,Mar 2025

SEA - ICN

Japan Airlines

8.3

Very good

1,464 reviews

Korean Air

8.4

Very good

1,069 reviews

Reviews

1 / 20

10.0

Excellent

Chris,Mar 2025

SEA - ICN

China Airlines

8.3

Very good

732 reviews

Korean Air

8.4

Very good

1,069 reviews

Reviews

1 / 20

10.0

Excellent

Chris,Mar 2025

SEA - ICN

ANA

8.3

Very good

852 reviews

Korean Air

8.4

Very good

1,069 reviews

Reviews

1 / 20

10.0

Excellent

Chris,Mar 2025

SEA - ICN

Singapore Airlines

8.1

Very good

1,292 reviews

Korean Air

8.4

Very good

1,069 reviews

Reviews

1 / 20

10.0

Excellent

Chris,Mar 2025

SEA - ICN

Related info for your journey

What are the cheapest airlines to fly from Washington, D.C. to Singapore one-way?
The cheapest airlines for a one-way flight from Washington, D.C. to Singapore are Air India ($406), Turkish Airlines ($455), and Cathay Pacific ($508).
What are the most popular routes from Washington, D.C. to Singapore?
The most popular route from Washington, D.C. to Singapore is Washington, D.C. Dulles Intl - Singapore Changi. You may also consider Washington, D.C. Reagan-National - Singapore Changi or Baltimore/Washington - Singapore Changi.
Can I find deals for flights from Washington, D.C. to Singapore that include hotel bookings?
Yes. In addition to deals on Washington, D.C. to Singapore flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Washington, D.C. to Singapore?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Washington, D.C. to Singapore.
Can I find deals for business class flights from Washington, D.C. to Singapore?
Yes. Cheapflights offers flight deals from Washington, D.C. to Singapore by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.
What is the cheapest month to book a flight from Washington, D.C. to Singapore?
Currently, September is the cheapest month in which you can book a flight from Washington, D.C. to Singapore (average of $1,011). Flying from Washington, D.C. to Singapore in December is currently the most expensive (average of $1,684). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Alternative routes for Washington, D.C. to Singapore

Dulles Intl to Haneda flights

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Dulles Intl to Kathmandu flights

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Dulles Intl to Dhaka flights

Reagan-National to Dhaka flights

Dulles Intl to Cochin flights

Dulles Intl to Don Mueang Intl flights

Reagan-National to Hong Kong flights

Dulles Intl to Colombo flights

Reagan-National to Ahmedabad flights

Reagan-National to Kathmandu flights

Dulles Intl to Phuket City flights

Top 8 airlines flying from Washington, D.C. to Singapore

Airline	Cheapest	Average	Flexibility	On-time
Turkish Airlines	Cheapest$830	Average$985	FlexibilityNo cancel fee	On-time77%
United Airlines	Cheapest$904	Average$1,461	FlexibilityNo cancel fee	On-time69%
Air Canada	Cheapest$960	Average$1,625	FlexibilityNo cancel fee	On-time67%
Qatar Airways	Cheapest$1,014	Average$1,282	FlexibilityNo cancel fee	On-time68%
JetBlue	Cheapest$1,024	Average$1,159	FlexibilityNo cancel fee	On-time62%
Korean Air	Cheapest$1,037	Average$1,322	FlexibilityNo cancel fee	On-time81%
Singapore Airlines	Cheapest$1,097	Average$1,681	FlexibilityNo cancel fee	On-time81%
American Airlines	Cheapest$1,124	Average$1,285	FlexibilityNo cancel fee	On-time71%

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$406+ Cheap flights from Washington, D.C. (WAS) to Singapore

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 8/20. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Washington, D.C. to Singapore with Cheapflights

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Cheap flight deals from Washington, D.C. to Singapore

Keep the following information in mind while searching for Washington, D.C. to Singapore flight deals. Data was last updated May 1, 2025.

Most accurate provider

Most trusted provider

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Find flight deals from Washington, D.C. to Singapore

Cheapest flights from Washington, D.C. to SingaporeExplore the most affordable flight options available from Washington, D.C. to Singapore. Find the lowest fares from popular airlines and budget airlines, with prices last updated on May 1, 2025.

Explore the most affordable flight options available from Washington, D.C. to Singapore. Find the lowest fares from popular airlines and budget airlines, with prices last updated on May 1, 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from Washington, D.C. to Singapore that are best for you.

Best time to book a flight from Washington, D.C. to Singapore

Have a flexible travel schedule? Discover the best time to fly to Singapore from Washington, D.C. with our price prediction graph.

Cheapflights Insights

Everything you need to know about your flight from Washington, D.C. to Singapore

What is the cheapest month to book a flight from Washington, D.C. to Singapore?

What is the cheapest time of day to fly from WAS to SG?

Find hourly flight availability from Washington, D.C. to Singapore. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated May 1, 2025.

Rainfall in Singapore by month

Plan your trip to Singapore by taking into account the average rainfall totals by month.

Temperature in Singapore by month

Plan your trip to Singapore by taking into account the average temperature totals by month.

Reviews of airlines servicing Singapore

See what other customers who have flown with Korean Air, Japan Airlines and China Airlines from Washington, D.C. to Singapore have to say. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

Find useful and relevant information for your journey from Washington, D.C. to Singapore. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

What are the cheapest airlines to fly from Washington, D.C. to Singapore one-way?

What are the most popular routes from Washington, D.C. to Singapore?

Can I find deals for flights from Washington, D.C. to Singapore that include hotel bookings?

How can I find direct flights from Washington, D.C. to Singapore?

Can I find deals for business class flights from Washington, D.C. to Singapore?

What is the cheapest month to book a flight from Washington, D.C. to Singapore?

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Cheapest flights from Washington, D.C. to Singapore
Explore the most affordable flight options available from Washington, D.C. to Singapore. Find the lowest fares from popular airlines and budget airlines, with prices last updated on May 1, 2025.