The cheapest times to fly from SEA to HPH are

  • February 5th to May 13th (except the weeks of April 9th and April 23rd)
  • August 27th to December 2nd

based on data collected exclusively by Champion Traveler across tens of millions of flights. Among all the dates above, the very cheapest time to fly from SEA to HPH is late September. Prices can be as high as $2267 for Sunday flights during mid December, or as low as $1142 for Tuesday flights around late September.


When to Fly to Hai Phong

Flying from Seattle, WA (SEA) to Hai Phong (HPH) will usually cost between $1299 to $1866 per person if booking more than four weeks in advance. On average the very cheapest time to fly is late September with an average ticket price of $1328. Due to high demand the most expensive time to fly is mid December, with an average price of $2069. Planning your trip to low-cost times can easily save you $741 on economy flights and even more on first-class flights. Generally, any price below $1478 can be considered a good price for a round-trip SEA to HPH flight.

See below for a graph of average weekly prices for the SEA to HPH route. All prices are for round-trip tickets in USD.

SEA to HPH Flight Prices

Compared to other flights, the SEA to HPH flight is slightly more expensive than the average and costs slightly more than the average flight leaving from Seattle. The average price per mile (for a direct flight) is $0.13, which is far below average.


Flight Prices by Day of the Week

Tuesday is usually the cheapest day to fly to HPH, and Sunday the cheapest day to fly back into SEA. Sundays are the most expensive days to fly to Hai Phong, and Thursdays are the most expensive days to return to Seattle. Selecting flights on the least expensive days could save you up to $446 (20%) on this flight.

Departing prices are for round-trip flights returning on the day of departure. For example, a flight departing on Tuesday and returning a week later will cost an average of $1486. Return trip prices are from the HPH to SEA flight, and often highlight the quality of our data in showing the same trend.

Departing Prices by Day

Departure Day Prices

Return Trip Prices by Day

Return Day Prices


Nonstop Flights and Layovers

Travelers looking to fly from SEA to HPH can generally find a 2-layover flight. Because there is not usually a direct flight option the real-world direct flight time of 13 hour 16 minutes may not be realistic.


Alternative Nearby Airports

Champion Traveler tells you which airports are nearby and whether tickets might be cheaper alternative airports nearby. Sometimes it’s worth it to fly into a closer airport and then commute to your destination. Remember that there is not usually a nonstop flight from SEA to HPH while comparing.

Destination alternative #1: Noibai International Airport (HAN) in Hanoi

  • 65 miles (105 km) away from HPH
  • Usually 52.28% less expensive than HPH
  • 1-layover flights available

See SEA to HAN flights


Flight Hacking SEA to HPH

Flight hacking is when you book two tickets instead of a layover, sometimes with different airlines. You will need to either bring only a carry-on bag (highly recommended) or leave yourself plenty of time to go through security again. Flight hacking is completely allowed, but airlines don’t always tell you the cheapest way to get from SEA to HPH — but Champion Traveler does!

Hack #1: Ho Chi Minh City (SEA > SGN > HPH)

  • Price for both tickets: $886
  • Average savings: $592 (40.03%)

See SEA to SGN flights

Hack #2: Hanoi (SEA > HAN > HPH)

  • Price for both tickets: $948
  • Average savings: $530 (35.87%)

See SEA to HAN flights

Hack #3: Da Nang (SEA > DAD > HPH)

  • Price for both tickets: $966
  • Average savings: $512 (34.62%)

See SEA to DAD flights


Flight Questions Answered

Still have questions about flying from SEA to HPH? We’ve got answers.

Which airlines fly this route?

You can find 12 major airlines flying this route most often: Air France, American, ANA, Asiana, Cathay Dragon, Cathay Pacific, China Airlines, China Southern, Delta, EVA Air, JAL, Vietnam Airlines, and potentially more during busy seasons.

How far away is it from Catbi International Airport to Seattle/Tacoma International Airport?

The distance between the two airports is roughly 6824 miles or 10982 kilometers.

How long does it take to fly from SEA to HPH?

The real-world flight time for a nonstop SEA to HPH flight is about 13 hour 16 minutes.

How many flights go between Seattle, WA and Hai Phong?

It depends on the day of the week and the date, but a typical day might have around 19 available flights from SEA to HPH.


Airport Location Info


Departing Airport

Origination code SEA
Origination airport name Seattle/Tacoma International Airport
City Seattle, WA
Country the United States
Latitude 47.5
Longitude -122.3

Return Airport

Destination code HPH
Destination airport name Catbi International Airport
City Hai Phong
Country Vietnam
Latitude 20.8
Longitude 106.7


Other Resources

Please note that while we’ve worked hard to analyzed tens of millions of flights to get you this data, we do not calculate current live prices or guarantee pricing. Please see our partners using the links above for current offers.