Every Big US Airline’s Economy Seat Width, Ranked: JetBlue Leads at 18 Inches on Most Jets, and Delta’s Seats Swing From 17.2 to 18.6 by Plane

Roughly an inch separates the typical standard economy seat at the top of the ranking from the one at the bottom, and the airplane you board can move you across that gap without changing airlines.

JetBlue has the widest standard economy seat width of any big US airline: 18 inches (46 cm) on most of its jets, and up to 19 inches (48 cm) on its A220s, according to its own seat pages as of November 2026. Breeze matches it at 18 inches.

Alaska, United, American and Allegiant sit closer to 17 inches (43 cm) on their Boeing 737s and older Airbuses.

The bigger swing is inside one airline. Delta’s Main Cabin seat is 17.3 inches (44 cm) wide on its 737-800 and 18.6 inches (47 cm) on its A220, a 1.3-inch (3 cm) difference at the same airline.

This is the companion to our economy legroom ranking, which measures the space in front of your knees. Width is the space between the armrests, and it follows a different rule.

Why the Plane Decides Your Seat Width, Not the Airline

Legroom is an airline choice: it moves the rows closer or farther apart. Width is mostly fixed by the fuselage, because a single-aisle cabin is only so wide and it has to hold a set number of seats across plus an aisle.

The Airbus A320 cabin is 12 ft 2 in (3.70 m) wide. The Boeing 737-800 cabin is 11 ft 7 in (3.54 m). Both seat six across, so the Airbus has a few more inches to share out.

Delta’s own pages show it: 18 inches on its A320, A321 and A321neo, against 17.3 inches on its 737-800 and 737-900ER.

The Airbus A220-300 is the outlier. Its cabin is narrower, at 10 ft 9 in (3.28 m), but airlines seat it five across, two on one side and three on the other.

JetBlue’s launch release called its layout two-by-three, and that is how its A220 seats reach 19 inches. Delta’s A220 seat, at 18.6 inches, beats every other Delta Main Cabin figure cited here.

Airbus has argued that this matters. When Southwest announced wider seats in 2015, Money reported that the typical 737 seat was 17 to 17.3 inches wide, and that Airbus was pushing an 18-inch minimum.

Southwest only flies 737s, so it worked on the seat instead. Its new cushions were 17.8 inches across, and when it picked RECARO seats in 2024, Jalopnik reported the same 17.8-inch figure for the three-seat rows.

Every Big US Airline’s Standard Economy Seat, Ranked by Width

The measure is standard economy seat width on each airline’s main fleet, not extra-legroom rows or first class. Airline pages are used where they publish width; where they do not, the source is named.

Rank	Airline	Standard economy width	Where it changes	Source
1	JetBlue	18 in on A320 Restyled, A321, A321neo	17.8 in on A320 Classic; 18.5 to 19 in on A220	jetblue.com seat details
2	Breeze	18 in	A220 Nice and Nicer seats	Runway Girl Network, Aug. 2026
3	Delta	18 in on A320, A321, A321neo, A330-900neo	17.2 to 17.4 in on 737, 757, A350; 18.1 in on 767-300ER; 18.6 in on A220	delta.com aircraft pages
4	Southwest	17.8 in on newer 737s	About 17 in on the older seat it replaced	Money (2015), Jalopnik (2024)
5	Frontier	17.1 to 18 in window and aisle (A320)	Middle seats 17.8 to 19.1 in; A321 seats from 16.5 in	flyfrontier.com
6	Alaska	17 in (737 MAX 9)	No published Alaska figure found	SeatMaps.com
7	American	17.2 in on A321	16.3 to 18.7 in on A321neo and A321XLR; 16.6 to 17.8 in on 737 MAX 8	American A321 fact sheet; SeatMaps.com (737)
8	United	16.6 to 17.8 in (737 MAX 8)	United’s aircraft pages could not be read	SeatMaps.com
9	Allegiant	16.5 to 17.8 in	Same range on A319, A320 and 737	allegiantair.com

The top of the table belongs to airlines whose standard seats sit on Airbus A320-family jets and A220s. The bottom leans on the 737, or publishes a range whose low end sits in the 16s.

Spirit is not ranked. Spirit stopped flying on May 2, 2026.

Delta’s widebodies tell the same story at a larger scale. Its A330-900neo Main Cabin seat is 18 inches and its 767-300ER seat is 18.1, while its A350-900, the biggest of the three, has the narrowest seat at 17.4 inches.

The Airline at the Top Also Sells a 16.3-Inch Seat

A single width per airline hides a lot. JetBlue publishes a second chart, meant to help parents find a seat that fits a child car seat, listing the narrowest and widest Main seat on each aircraft.

On its A320 and A321, the narrowest Main seat is 16.30 inches (41 cm), and on the A321neo it is 16.55 inches. The 16.3-inch figure is the same low end American lists for its A321neo, and American ranks seventh here.

Frontier shows the other surprise. It finished last in our legroom ranking at 28 inches of pitch, yet its own A320 page lists middle seats at 17.8 to 19.1 inches, a wider range than the window and aisle seats beside them. On that measure, a Frontier middle seat can beat a JetBlue window seat.

Delta shows how fine the margins are. Three of its 757-200 layouts list 17.3-inch seats and a fourth lists 17.2, so the same aircraft type on the same airline is not always the same seat.

For a traveler, the practical rule is simple. If width matters, pick the flight by aircraft first and airline second, and check the seat map for the exact plane. Our guide to the types of airplane seats covers what changes from row to row.

More Wide Seats Are Coming, Mostly at the Front

The airlines are adding width where they can charge for it. American’s newest narrowbody, the A321XLR, entered domestic service on Dec. 18, 2025, with 12 Premium Economy seats at 21.3 inches, and 123 Main Cabin seats listed at 16.3 to 18.7 inches.

On Aug. 18, 2026, American announced a fleetwide cabin upgrade that takes premium seating from about a quarter of narrowbody departures to roughly 40%. The plan covers screens, Wi-Fi and premium seats; it gave no figure for economy seat width.

The economy seat itself is not getting wider on the 737, because the fuselage is not. Southwest’s 2024 RECARO seat promised to maximize seat width, and the figure reported for it, 17.8 inches, is the same one Southwest announced in 2015.

That leaves the A220 as the clearest route to a wider economy seat on a US domestic flight. JetBlue, Delta and Breeze all fly it, and on all three the standard seat is at least 18 inches. The widest economy seat a big US airline sells is still decided at the factory, not in the fare.