The cheapest times to fly from SEA to TBU are

  • January 29th to June 3rd (except the week of April 2nd)
  • August 6th to October 7th (except the week of August 13th)

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 TBU is late February and early March. Prices can be as high as $6624 for Friday flights during mid December, or as low as $1169 for Saturday flights around late February and early March.


When to Fly to Nuku’alofa

Flying from Seattle, WA (SEA) to Tonga Tapu (TBU) will usually cost between $1215 to $2519 per person if booking more than four weeks in advance. On average the very cheapest time to fly is late February and early March with an average ticket price of $1291. Due to high demand the most expensive time to fly is mid December, with an average price of $3425. Planning your trip to low-cost times can easily save you $2134 on economy flights and even more on first-class flights. Generally, any price below $1542 can be considered a good price for a round-trip SEA to TBU flight.

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

SEA to TBU Flight Prices

Compared to other flights, the SEA to TBU flight is 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 $0.17, which is below average.


Flight Prices by Day of the Week

Saturday is usually the cheapest day to depart and return on this flight. Fridays are the most expensive days to fly out or take a return trip. Selecting flights on the least expensive days could save you up to $306 (16%) on this flight.

Departing prices are for round-trip flights returning on the day of departure. For example, a flight departing on Saturday and returning a week later will cost an average of $1502. Return trip prices are from the TBU 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 TBU can generally find a 2-layover flight. Because there is not usually a direct flight option the real-world direct flight time of 11 hour 22 minutes may not be realistic.


Flight Hacking SEA to TBU

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 TBU — but Champion Traveler does!

Hack #1: Auckland (SEA > AKL > TBU)

  • Price for both tickets: $1436
  • Average savings: $106 (6.87%)

See SEA to AKL flights


Flight Questions Answered

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

Which airlines fly this route?

You can find 11 major airlines flying this route most often: Air Canada, Air New Zealand, Alaska, American, Delta, Fiji Airways, Lufthansa, Singapore Airlines, United, Virgin Australia, WestJet, and potentially more during busy seasons.

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

The distance between the two airports is roughly 5766 miles or 9279 kilometers.

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

The real-world flight time for a nonstop SEA to TBU flight is about 11 hour 22 minutes.

How many flights go between Seattle, WA and Tonga Tapu?

It depends on the day of the week and the date, but a typical day might have around 11 available flights from SEA to TBU.


Airport Location Info


Departing Airport

Origination codeSEA
Origination airport nameSeattle/Tacoma International Airport
CitySeattle, WA
Countrythe United States

Return Airport

Destination codeTBU
Destination airport nameFua Amotu International Airport
CityTonga Tapu


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.