In a direct comparison, United Airlines is generally more comfortable than Spirit Airlines due to standard amenities, though Spirit's recent 2026 "Go Big" and "Go Comfy" fare bundles have narrowed the gap. On a standard United flight, you receive a seat with 30 to 31 inches of legroom (pitch), a seat that actually reclines, and access to seatback or mobile entertainment. United also offers complimentary snacks and non-alcoholic drinks. Spirit's standard "Basic" seats have a tighter 28-inch pitch and do not recline ("pre-reclined" position). However, Spirit’s "Big Front Seat" is widely considered more comfortable than United's domestic First Class in terms of pure seat width and padding, offering up to 36 inches of legroom without the luxury price tag. Additionally, Spirit's "Go Comfy" option blocks the middle seat for extra elbow room. Ultimately, if you value "full-service" perks like free snacks, carry-ons included in most fares, and entertainment, United is the winner. If you are a savvy traveler who only cares about the physical seat and chooses Spirit's premium bundles, you might find the experience comparable to or even better than United’s standard economy.