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Cheap flights from Washington to Phnom Penh from $2,334

This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from Washington to Phnom Penh departing on 9/1. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Find the cheapest flights from Washington to Phnom Penh

Cheap round-trip flights

Enter your travel dates to find the best prices.
British Airways Logo
1:30 pm - 10:00 am
SEA
-
PNH
54h 30m
2 stops
British Airways Logo
6:20 pm - 6:25 pm
PNH
-
SEA
38h 05m
2 stops
$2,334British Airways
Tue, Sep 1 - Thu, Oct 1
British Airways Logo
8:20 pm - 10:00 am
SEA
-
PNH
47h 40m
2 stops
British Airways Logo
6:20 pm - 7:24 pm
PNH
-
SEA
39h 04m
3 stops
$2,410British Airways
Tue, Sep 1 - Thu, Oct 1
British Airways Logo
8:20 pm - 10:00 am
SEA
-
PNH
47h 40m
3 stops
British Airways Logo
6:20 pm - 5:29 pm
PNH
-
SEA
37h 09m
3 stops
$2,419British Airways
Tue, Sep 1 - Thu, Oct 1
British Airways Logo
8:20 pm - 10:00 am
SEA
-
PNH
47h 40m
3 stops
British Airways Logo
6:20 pm - 11:50 pm
PNH
-
SEA
43h 30m
3 stops
$2,723British Airways
Sat, Aug 1 - Tue, Sep 1
British Airways Logo
7:30 pm - 10:00 am
PDX
-
PNH
48h 30m
2 stops
British Airways Logo
6:20 pm - 5:40 pm
PNH
-
PDX
37h 20m
2 stops
$2,784British Airways
Sat, Aug 1 - Mon, Aug 31
British Airways Logo
8:20 pm - 10:00 am
SEA
-
PNH
47h 40m
3 stops
British Airways Logo
6:20 pm - 6:25 pm
PNH
-
SEA
38h 05m
2 stops
$2,812British Airways
Sat, Aug 1 - Tue, Sep 1
British Airways Logo
1:30 pm - 10:00 am
SEA
-
PNH
54h 30m
2 stops
British Airways Logo
6:20 pm - 11:35 am
PNH
-
SEA
31h 15m
2 stops
$2,913British Airways
Sat, Aug 1 - Tue, Sep 1

British Airways flights from State of Washington to Phnom Penh

Our best British Airways deals on State of Washington to Phnom Penh flight tickets
British Airways
Sep 1
SEA1:30 pmSeattle/Tacoma Intl
54h 30m
2 stops
PNH10:00 amPhnom Penh Pochentong
Oct 1
PNH6:20 pmPhnom Penh Pochentong
38h 05m
2 stops
SEA6:25 pmSeattle/Tacoma Intl
$2,334
British Airways
Sep 1
SEA8:20 pmSeattle/Tacoma Intl
47h 40m
2 stops
PNH10:00 amPhnom Penh Pochentong
Oct 1
PNH6:20 pmPhnom Penh Pochentong
39h 04m
3 stops
SEA7:24 pmSeattle/Tacoma Intl
$2,410
British Airways
Sep 1
SEA8:20 pmSeattle/Tacoma Intl
47h 40m
3 stops
PNH10:00 amPhnom Penh Pochentong
Oct 1
PNH6:20 pmPhnom Penh Pochentong
37h 09m
3 stops
SEA5:29 pmSeattle/Tacoma Intl
$2,419

momondo Fare Finder

 
Customize your flight search to find flights from State of Washington to Phnom Penh 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 May 8, 2026.
Use the filters below to find and compare flights from Washington to Phnom Penh that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattlePhnom Penh

SEA - PNH

SEAPNH

Seattle/Tacoma Intl

Tue 9/1

1:30 pm-10:00 am

2 stops54h 30m

Phnom Penh Pochentong

Thu 10/1

6:20 pm-6:25 pm

2 stops38h 05m

$2,334

SeattlePhnom Penh

SEA - PNH

SEAPNH

Seattle/Tacoma Intl

Tue 9/1

8:20 pm-10:00 am

2 stops47h 40m

Phnom Penh Pochentong

Thu 10/1

6:20 pm-7:24 pm

3 stops39h 04m

$2,410
Quickest round-trip

SeattlePhnom Penh

SEA - PNH

SEAPNH

Seattle/Tacoma Intl

Tue 9/1

8:20 pm-10:00 am

3 stops47h 40m

Phnom Penh Pochentong

Thu 10/1

6:20 pm-5:29 pm

3 stops37h 09m

$2,419

SeattlePhnom Penh

SEA - PNH

SEAPNH

Seattle/Tacoma Intl

Sat 8/1

8:20 pm-10:00 am

3 stops47h 40m

Phnom Penh Pochentong

Tue 9/1

6:20 pm-11:50 pm

3 stops43h 30m

$2,723

PortlandPhnom Penh

PDX - PNH

PDXPNH

Portland

Sat 8/1

7:30 pm-10:00 am

2 stops48h 30m

Phnom Penh Pochentong

Mon 8/31

6:20 pm-5:40 pm

2 stops37h 20m

$2,784

SeattlePhnom Penh

SEA - PNH

SEAPNH

Seattle/Tacoma Intl

Sat 8/1

8:20 pm-10:00 am

3 stops47h 40m

Phnom Penh Pochentong

Tue 9/1

6:20 pm-6:25 pm

2 stops38h 05m

$2,812

SeattlePhnom Penh

SEA - PNH

SEAPNH

Seattle/Tacoma Intl

Sat 8/1

1:30 pm-10:00 am

2 stops54h 30m

Phnom Penh Pochentong

Tue 9/1

6:20 pm-11:35 am

2 stops31h 15m

$2,913
Cheapest one-way
Quickest one-way

SeattlePhnom Penh

SEA - PNH

SEAPNH

Seattle/Tacoma Intl

Tue 9/15

8:20 pm-10:00 am

2 stops47h 40m

$6,737

SeattlePhnom Penh

SEA - PNH

SEAPNH

Seattle/Tacoma Intl

Fri 8/7

1:30 pm-10:00 am

2 stops54h 30m

$6,977

SeattlePhnom Penh

SEA - PNH

SEAPNH

Seattle/Tacoma Intl

Fri 7/24

8:20 pm-10:00 am

3 stops47h 40m

$7,001

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

See travel insights to Phnom Penh from

How to get the cheapest flight ticket from State of Washington to Phnom Penh

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 Phnom Penh?

In general, August is the cheapest month to fly from State of Washington to Phnom Penh. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $515. If you aren’t able to travel to Phnom Penh during the month of August, then flying in November is also cheap. Prices for this month can be found on momondo for an average of $585.

How far in advance should I book a flight from Washington to Phnom Penh?

You are more likely to see cheaper flights to Phnom Penh from State of Washington when booking weeks ahead of your departure date. In general, you can expect to find flights to Phnom Penh for around $1,072 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Phnom Penh from State of Washington for as low as $946 on momondo.

Cheap State of Washington to Phnom Penh flight deals and tips

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

Fastest flight time

26h 05m

Direct flights

None
The fastest flight from State of Washington to Phnom Penh takes 26h 05m
There are no direct flights from State of Washington to Phnom Penh. There are no popular flight routes from State of Washington to Phnom Penh.
Search flight deals

Frequently asked questions about flying from Washington to Phnom Penh

  • When did momondo last update prices for flights from Washington to Phnom Penh Pochentong Airport?

    Prices for flights from Washington to Phnom Penh Pochentong Airport are updated daily.

  • How many operators does momondo search for flights from Washington to Phnom Penh Pochentong Airport?

  • How old do you have to be to fly from Washington to Phnom Penh Pochentong 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 Phnom Penh Pochentong Airport.

  • What documentation or ID do you need to fly to Phnom Penh Pochentong Airport?

    The travel and health documents you'll need for your trip to Phnom Penh Pochentong Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Phnom Penh Pochentong Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

Best airlines flying from State of Washington to Phnom Penh

Compare and see reviews for airlines that fly from State of Washington to Phnom Penh with momondo
Airline
Rating
Free Cancellation
Price
Singapore AirlinesPriceFrom $702Free CancellationRating
8.2
1,511 reviews
Search Singapore Airlines flights
Asiana AirlinesPriceFrom $773Free CancellationRating
8.1
530 reviews
Search Asiana Airlines flights
Korean AirPriceFrom $787Free CancellationRating
8.4
1,217 reviews
Search Korean Air flights
EVA AirPriceFrom $1,094Free CancellationRating
8.5
1,444 reviews
Search EVA Air flights
China AirlinesPriceFrom $1,162Free CancellationRating
8.3
822 reviews
Search China Airlines flights

Why use momondo?

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

Finding the right flight to Phnom Penh from Washington is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to Phnom Penh quick and easy, saving you time and money.

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

All flight searches from Washington to Phnom Penh on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from Washington to Phnom Penh?

Once all potential Washington to Phnom Penh flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

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

If you are simply researching potential flights to Phnom Penh, momondo offers a useful price alert feature which will track prices for flights to Phnom Penh from Washington and alert you when they change.

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