Alaska Airlines vs Southwest Airlines (2026): Which Should You Actually Book?

For 50 years the choice was simple — Southwest meant two free bags and pick-your-own seat — but in 2026 both of those are gone, and that single fact rewrites the entire comparison.

These are two American “classic” carriers with nearly identical numbers — Alaska sits at AFR 67, Southwest 69; both hold 3 Skytrax stars; on-time performance is a dead heat (Alaska 81%, Southwest 82% on Cirium’s 2025 annual). Pitch is a row apart (Alaska 31 inches, Southwest a roomier 32). On paper, a coin flip. But 2026 detonated the things that actually defined them. Southwest killed free checked bags in May 2025 and ended its legendary open-seating “cattle call” on 27 January 2026 — the two policies that were Southwest. Alaska, meanwhile, swallowed Hawaiian, rebranded Mileage Plan into Atmos Rewards, and started bolting free Starlink wi-fi onto its 737s. So this isn’t a comparison of two static airlines. It’s a comparison of who reinvented themselves better — and which one still saves you money at the cheapest fare.

Side-by-side, on real numbers

The figures below come from the live fares aifly tracks plus current published policy and our sourced cabin data — not vague “Standard / Standard” filler.

Comfort/fleet/OTP from sourced 2025–26 ratings; bag and fee figures reflect each airline’s cheapest bookable fare and can change — always confirm at booking.

The bombshell: Southwest's two free bags are dead — and that flips everything

Here’s the headline every aifly reader needs: Southwest no longer gives you free checked bags. The policy that defined the brand for half a century ended in May 2025, and in April 2026 the fees climbed again — $45 for the first bag, $55 for the second (up from the launch price of $35/$45). The only survivors of free bags are Rapid Rewards credit-card holders (one free bag), Business Select fares, and A-List Preferred elites. So for a walk-up traveller booking the cheapest fare, Southwest now charges to check a bag just like everyone else. Alaska’s Saver fare is honestly hand-luggage-only with paid checked bags too — but at least Alaska never pretended otherwise. The practical upshot: the historical reason to choose Southwest over Alaska on price has evaporated. If you don’t hold their co-brand card, run the all-in number, not the base fare.

Southwest charges $45 to check a bag and assigns your seat — in 2026 it became the thing it spent 50 years mocking.

Open seating is over too — Southwest now assigns seats (and charges for the good ones)

The other half of Southwest’s identity died on 27 January 2026: the open-seating boarding scramble is gone, replaced by assigned seating with Standard, Preferred and Extra Legroom tiers — and yes, the better seats cost extra, mirroring Alaska almost exactly. Both airlines now sell seat selection on top of the base fare (neither includes free seat selection on the cheapest ticket). The difference is comfort: Southwest’s 32-inch pitch beats Alaska’s 31, and its all-737 cabins are consistent. But the era where Southwest felt structurally different from a legacy carrier is finished. “They became the thing they spent 50 years mocking,” is the honest read. For the budget flyer, the takeaway is mundane but important — model both airlines as standard US economy: pay for the bag, pay for the seat, or don’t, and compare the totals.

Network: the Oneworld coast-to-coaster vs the domestic point-to-point machine

This is where they genuinely diverge. Alaska is a Seattle-anchored Oneworld member (it joined in 2021), which means a cheap Alaska economy ticket earns and burns miles across Cathay, JAL, Qatar, British Airways and the rest — you can route Alaska miles into Cathay first to Hong Kong or JAL business to Tokyo. Our data shows Alaska turning up as a deal across a broad West Coast and transcon spread (SEA, LAX, SFO, SAN, PDX) plus a surprise long-haul: Reykjavík (KEF). Southwest belongs to no alliance at all — your Rapid Rewards points are a walled garden, useful only on Southwest’s own dense US grid plus Hawaii, Mexico and a growing Caribbean list (St. Thomas and St. Maarten arrive in 2026). If you want your cheap domestic ticket to feed a future international redemption, Alaska wins outright. If you just shuttle between US cities Southwest serves nonstop, its point-to-point map is unbeatable.

Connectivity: free Starlink vs cheap-but-paid — the one clear gap

This is Alaska’s trump card, with an honest asterisk. Alaska is rolling out free Starlink wi-fi — genuinely free for (also-free) Atmos Rewards members, and reportedly 7× faster than the geostationary systems most rivals fly. The catch: it’s rolling out, not done. It launched on a handful of E175 regional jets ahead of schedule, 737s are getting it through early 2026, and the 787s follow later in the year, with fleet-wide completion targeted for early 2027. So you might board a Starlink jet — or you might not, yet. Southwest offers broadband wi-fi too, and it’s cheap, but it’s paid. For a long transcon where you actually want to work, Alaska’s free, fast Starlink (when you get a fitted aircraft) is the single most compelling onboard reason to pick it. Just don’t assume every Alaska flight has it in 2026.

Alaska's free Starlink is the single best onboard reason to pick it — just don't assume your jet has it yet.

Food and cabin: snacks both ways, no hot meal anywhere

Don’t book either of these for the catering. Both are firmly in snack-and-streaming territory: a complimentary snack in economy, entertainment streamed to your own device, and crucially no hot meal — even on the longest transcontinental or Hawaii flights. That’s a real knock on both for a five-hour SEA–BOS or a Hawaii hop where a legacy carrier might feed you. Cabin comfort is close: Southwest’s 32-inch pitch and 17-inch width on uniform 737-800s versus Alaska’s 31-inch pitch, 17.3-inch width on a younger, MAX-heavy fleet (Alaska’s average aircraft age is 10 years to Southwest’s 12). Alaska does sell a domestic First Class with a real recliner seat and table service, which Southwest simply doesn’t offer — Southwest has no premium cabin at all, only its Extra Legroom economy. If you want any shot at a front-cabin upgrade, Alaska is the only one of the two that has a front cabin.

Reliability, safety and the merger asterisk

On the metric that matters most to a traveller — does the flight leave on time — these two are statistically tied: Alaska 81%, Southwest 82% on Cirium’s 2025 annual data. Both run famously disciplined operations; Alaska’s West Coast hub network and Southwest’s point-to-point model both prize quick turns and recovery. Safety records on both are strong modern-era US majors. The real watch-out is structural, not operational: Alaska’s Hawaiian merger is still being digested. Loyalty has already been overhauled into Atmos Rewards (Mileage Plan and HawaiianMiles folded into one, MVP tiers replaced by Silver/Gold/Platinum/Titanium), and big integrations like this carry a year or two of schedule and IT turbulence. Southwest’s turbulence is the opposite kind — a brand-trust hangover from stripping away the two perks customers loved. Neither is a reliability red flag; both are mid-transition airlines.

So — which one?

Frequently asked questions

Fares, fleet and policy details verified July 2026 and reflect each airline’s cheapest bookable fare unless noted; programmes and rollouts change — always confirm at booking.