The Boeing 777X Vs The 777-300ER – What Is The Difference?


With the news of the new 777X about to start flight testing, one has to wonder what exactly is different from the previous versions of the 777 series, particularly the 777-300ER. What makes it so special and why are aviation enthusiasts so excited for the future of the 777 program?

British Airways Boeing 777X. Photo courtesy of Boeing.

There are actually six existing versions of the 777 (not including any special one-off private versions, or military versions) and two new versions (the 777X series) that are about to start flying. They are:

  • First Generation – Boeing 777-200, 777-200 Extended Range (ER), and 777-300
  • Second Generation – Boeing 777-200LR (Long Range), 777F (Freight) and 777-300ER
  • Third Generation – Boeing 777X-8 and 777X-9

What are the main differences?

To make it very clear how each varient of the 777 family compares to another, we have put together this chart below:

TypeLengthSpanPassengers (3 class)Max passengersRangeList price
777-20063.73 m60.93 m3054405,240 nmiUS$261.5 M
777-200ER63.73 m60.93 m3054407,065 nmiUS$306.6M
777-200LR63.73 m64.80 m3014408,555 nmiUS$346.9M
777-30073.8660.93 m3685506,030 nmiUS$361.5M
777-300ER73.8664.80 m3655507,370 nmiUS$375.5M
777F63.73 m64.80 mn/an/a4,970 nmiUS$352.3M
777X-869.8 m71.8 m365unknown8,690 nmiUS$394.9M
777X-976.7 m71.8 m414unknown7,525 nmiUS$425.8M

*List prices are adjusted for inflation. Keep in mind it is very unlikely that any airline would actually pay the list price.

What is better about the 777X?

Looking at the above chart there are several key differences in the 777X program. The first major difference is passenger capacity. The 777X-8 can carry 365 in three classes, the same as the biggest current 777 jet, the 777-300ER. This means for the next generation Boeing fully intends to not make anything smaller than the maximum available on the market (they would push customers towards the 787 instead). The 777X-9 then goes on to raise the limit to 414 in three classes, making the aircraft a rival to the A380 and 747.

The range has also seen a major improvement. The 777X-8 can carry passengers further than any other version of the 777 ever, and the 777X-9, whilst a shorter distance, hardly remains uncompetitive when compared to older versions at 7 1/2 thousand nautical miles.

Boeing 777x
The 777X-8 at a gate (notice the folded wingtip). Source: Boeing

This obviously comes at a cost, with both the versions of the 777X costing more than any before them. But, as we mentioned in this article about costs and list prices, these prices are designed to reflect 10 years of inflation and are purposely raised much higher.

What about technology?

However, there is far more to the new 777X than just better range and passenger capacity. The new 777X program builds off the technology developed and proven in the 787, some of which are:

  • Latest GE engines. These engines are cutting edge and will allow the plane to fly further on less fuel (and be better for the environment!)
  • Lower operational costs. At an approx 14% less cost to run than previous models of the 777, this will mean cheaper airfares for passengers.
  • Passenger comfort improvements such as Larger windows, wider cabin, new lighting, new architecture.
  • Better pilot technology such as turbulence detectors and better autopilot systems.

Plus one new feature that requires a special mention, the 777X folding wing tip. Because the wingspan is so huge, the actual ends of the wings need to fold upwards to allow the plane to use normal gates. This new wing design actually needed FAA approval as it is technically a new class of airplane.

Boeing 777x
The folding wingtip of the new 777X. Source: Boeing

What do you think of the 777x compared to older versions of the aircraft?


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Air-journal blog

The 777-9 engines are more eccentric than the 777-300ER engines.

Mark Mc

One thing that hasn’t been mentioned is that the fuselage is actually wider on the 777X models compared to the older 777-300ER. Further, once the 777X goes into production with the -8 and -9 models, the 777-300ER will no longer be manufactured.

James Strange

Hopefully the in-flight noise level will be lower. I suspect the interior environment will be improved overall.

Hard to believe the spool-up sound of the GE9X will be as good as the GE90. <==== Because that's important. 🙂


A major error is in this article.

“Lower operational costs. At an approx 14% less cost to run than previous models of the 777, this will mean cheaper airfares for passengers.”

This is incorrect. It should say “this will mean more profit per seat for the carrier”

No plane was ever designed for cheaper airfares. Airfares are driven by different business metrics than the planes design.

The level of correlation between a planes design and its ability for consumers to get lower fares is very small.

Aircraft Lover

I think the upgraded new Boeing B-777X is going to be a great aircraft


I noticed the 773 has 5 exits, whereas the 779 only seems to have 4, despite being longer and carrying more pax. I wonder why?

Ehud Gavron

I love it when people who don’t know much about the aircraft being discussed switch the topic to different system of market trading. Capitalism? Government intervention? On an aircraft forum? Just admit you know nothing about the Boeing 7xx and go from there.

Ehud Gavron
Tucson AZ

paul Aziz

“less cost to run than previous models of the 777, this will mean cheaper airfares for passengers.” I doubt that


“Because the wingspan is so huge, the actual ends of the wings need to fold upwards to allow the plane to use normal gates.”

Oooh! 🐱
I find this very interesting, the wingspan being so long, but how will this help exactly? It looks like a 3-foot extension on either side…


Pet peeve, it’s “farther” not “further”.

Won’t the 777X be quitter, have more cabin pressure and humidity as well?

Gerry. Bailey

I thought that the folding winglets were a fuel saving device

George Mells

Nobody mentioned that the 777X uses a composite wing similar to the 787. I remember the big deal when Boeing broke ground in Everett for the new building to make the wings.