Delta vs United: Airline Comparison Guide

When it comes to flying within the US (or heading further afield), Delta and United are two of the biggest names in the sky. Both offer huge networks, a range of cabin options and loyalty perks that keep frequent flyers coming back. Still, picking between the two isn’t always straightforward.

This guide breaks it all down. From basic economy restrictions to lie-flat luxury in Polaris and Delta One, we’ve compared what really matters, like seat comfort, baggage rules, loyalty points and where each airline can take you.

Whether you're booking your next trip with points, looking to fly first class, or just trying to avoid extra fees, we’ll help you decide which airline works best for you. Let’s get into it.

✨Quick Answer: Is Delta or United Better?

Both Delta and United are strong choices, each with their own strengths.

• Choose Delta for better flight punctuality, stronger customer satisfaction and a smoother onboard experience.
• Go with United if you want more international routes, access to Polaris business class and a wider choice of partner airlines.

Your decision really depends on what matters most - comfort, loyalty perks or where you’re flying.

At a Glance

Delta and United are two of the biggest airlines in the US, with global reach and millions of passengers flying with them each year.

Airline size and reach 📏

• Delta serves over 275 destinations across six continents, with a strong domestic network and consistent coverage in Europe and Asia.
• United flies to more than 300 destinations in over 60 countries, offering one of the largest international networks of any US airline.

Alliances 🤝

• Delta is part of the SkyTeam alliance, working with partners like Air France, KLM and Korean Air.
• United belongs to Star Alliance, the largest airline alliance globally, giving access to partners like Lufthansa, ANA and Singapore Airlines.

Major hubs 🛫

• Delta’s key hubs include Atlanta, Detroit, Minneapolis-St. Paul and Salt Lake City.
• United’s hubs include Chicago O’Hare, Denver, Newark and San Francisco.

Reputation 🗣️

• Delta is often praised for its flight punctuality, in-flight service and customer experience.
• United tends to stand out for its route network and premium cabin offerings, including Polaris business class on international routes.

Basic Economy Comparison

Basic economy might be the cheapest fare on the page, however, it comes with strings attached, and those strings look different depending on whether you fly with Delta or United.

Carry-on rules 🎒

• Delta’s basic economy fare includes a free carry-on bag and a personal item.
• United’s version only includes a personal item unless you’re flying transatlantic or hold elite status. Bring a full-sized carry-on and you’ll likely have to check it at the gate, and pay for it.

Seat selection 💺

• Neither airline offers free seat selection in basic economy.
• With Delta, you’re assigned a seat at check-in.
• United assigns a seat automatically, and you won’t be able to change it (even for a fee) until after check-in opens.

Boarding group 🚪

Both airlines place basic economy passengers in the final boarding group, which means limited overhead bin space and a bit more of a scramble.

What’s missing ⛔

You won’t earn many frequent flyer miles on either airline with this fare, and changes or cancellations are usually not allowed.

Which feels more restrictive? 🤔

• United’s basic economy is noticeably stricter, especially with the carry-on limit.
• Delta’s version still has its drawbacks, though it offers a bit more breathing room for travellers who pack light and prefer not to check a bag.

✨Our thoughts: If you're going basic, Delta’s the better bet. The free carry-on alone makes a big difference, and the overall experience feels a little less punishing. United’s basic economy is stricter across the board - worth knowing before you book the cheapest option.

Premium Cabin Comparison

Looking to upgrade from standard economy? Both Delta and United offer a few steps up - how much you get depends on how far you're flying and how much you’re willing to pay.

Delta Comfort+ vs United Economy Plus ✨

• These are the first-tier upgrades on domestic and short-haul routes. Both offer extra legroom, priority boarding and access to overhead bin space.
• Delta Comfort+ also includes dedicated overhead storage and complimentary alcohol on most flights. For short trips, Delta stays ahead on value and comfort.

Delta Premium Select vs United Premium Economy ✨

These cabins are built for long-haul flights. You’ll get wider seats, more recline and better meals than standard economy.

• Delta Premium Select tends to feel a bit more polished, with quieter cabins and more refined touches.
• United’s version is solid too, though more hit or miss depending on the aircraft.

Delta One vs United Polaris ✨

This is the big one - long-haul business class. Both offer lie-flat seats, premium dining, priority boarding and lounge access.

• Polaris shines with sleek seat pods and great bedding.
• Delta One wins on service and inflight atmosphere. It’s close, but Delta often feels more consistent across routes.

Domestic First Class ✨

Delta and United both offer recliner-style seats up front on domestic routes.

• United’s can feel roomier, though Delta tends to win on service and flight punctuality.
• Neither offers a full luxury experience, however, Delta usually makes the upgrade feel more worthwhile.

✨Our thoughts: Both airlines offer solid upgrade options, however, Delta tends to feel more polished and consistent, especially on shorter routes and in Delta One. United’s Polaris excels on international flights, but comfort and experience can vary more by aircraft. If you're paying to upgrade, Delta generally delivers more for the price.

Seat Comfort Comparison

When it comes to seat comfort, the difference between Delta and United isn’t huge, but a few small touches can make one feel more comfortable than the other.

Legroom and seat space 📏

• Both Delta and United offer around 30 to 31 inches of legroom in standard economy, depending on the aircraft.
• Seat width is also similar, usually between 17 to 18 inches. It’s tight either way, though not out of the ordinary for major US airlines.

Recline and seat padding 🛋️

Delta tends to have slightly better seat padding across most of its fleet, especially on newer aircraft. Recline is about the same on both airlines, though Delta’s cabin design can make it feel a bit more relaxed.

Cabin layout and lighting 🛫

• Delta’s cabins often feel fresher and more modern, especially on refurbished aircraft with mood lighting and sleeker seatback screens.
• United is updating many of its cabins too. Older planes still in rotation can feel more dated though.

Which feels more spacious? 🤔

✨Our thoughts: It’s close, but Delta feels roomier thanks to better lighting, cleaner design and more consistent updates across its fleet. While legroom numbers are similar, the overall cabin experience can make Delta’s economy seats feel just a touch more comfortable, especially on longer flights.

Frequent Flyer and Loyalty Programs

Delta’s SkyMiles and United’s MileagePlus are two of the most well-known airline loyalty programs, however, they don’t work the same way.

Earning miles 💰

Both are spend-based. You’ll earn 5 miles per $1 spent on tickets (excluding taxes), with bonuses for elite members. You can boost earnings with co-branded credit cards or partner bookings.

Elite status ⬆️

• Delta uses Medallion Qualification Dollars (MQDs) to determine status, which can be hard to hit without big spending or a Delta Amex.
• United’s system is more flexible, with Premier Qualifying Flights (PQFs) and Points -(PQPs) - a better option if you fly more often than you spend.

Airline partners 🌐

• SkyMiles members benefit from Delta’s SkyTeam partners like Air France, KLM and Korean Air.
• MileagePlus members get access to Star Alliance, which includes big hitters like Lufthansa, ANA and Singapore Airlines. If global travel is your thing, Star Alliance offers more reach.

Redemption value 💸

• Delta has no award chart, so prices can swing wildly with demand. Look out for SkyMiles Deals for better value.
• United’s pricing is more stable, with the Excursionist Perk adding extra value to multi-city trips.

Long-term value 🏆

• MileagePlus tends to be better for frequent international flyers thanks to generous upgrade options and stronger global redemption partners.
• SkyMiles is great for domestic travellers, although it has been criticised for unpredictable award pricing.

✨Our thoughts: If you fly often and value upgrades, MileagePlus might go further. But if service and domestic reliability matter more, SkyMiles holds its own.

Travel Credit Card Options

A co-branded credit card can unlock extra perks and save you money.

Delta SkyMiles® Cards (by American Express) 🔴

• Free first checked bag
• Priority boarding
• Earn miles on everyday purchases
• Access to Delta Sky Club (on some cards)
• MQD waivers on spend thresholds (for elite status)

United MileagePlus® Cards (by Chase) 🔵

• Free first checked bag
• Priority boarding
• 2 United Club passes per year (on some cards)
• Expanded award availability
• Travel credits and trip insurance benefits

Which is better? 🤔

• Go Delta Amex if you fly Delta regularly and want lounge perks or MQD boosts.
• Choose United Chase if you’re a frequent global traveller and value Star Alliance access or better redemption flexibility.

✨Our thoughts: If you’re loyal to one airline, a co-branded card can be a game-changer. It’s not just about points - it’s free bags, smoother boarding and faster path to status.

Routes, Destinations and On-Time Performance

Delta and United both have massive networks - how and where they fly can make a real difference depending on your travel plans.

Who flies where 🌎

• United flies to over 300 destinations in more than 60 countries, with a particularly strong presence across Asia, Europe, and South America. It’s a go-to for international travel, especially from major hubs like Chicago, Newark and San Francisco.
• Delta serves more than 275 destinations across six continents. While its international reach isn’t quite as wide as United’s, it covers key global routes and offers excellent domestic coverage, especially across the East Coast and South.

Domestic vs international 🏠

• Delta dominates many key US hubs like Atlanta and Minneapolis, making it a favourite for domestic travel.
• United leads when it comes to long-haul international routes, with more global partner airlines and easier access to far-flung destinations.

On-time performance ⏱️

Delta has a solid reputation for punctuality. It’s regularly ranked as one of the most reliable US airlines, with fewer cancellations and delays than United. If being on time is a priority, Delta has the edge.

✨Our thoughts: Choose Delta for dependable domestic travel and strong East Coast routes. Go with United if you need more international options or want to connect through a global hub.

Baggage, WiFi and Lounges

When it comes to these extras, Delta and United share some similarities but differ in the details.

Baggage rules 🧳

Both airlines include a personal item and a carry-on bag with most fares, except United’s Basic Economy, which only allows a personal item unless you’re flying internationally or have status. Checked bag fees are standard across both, typically around $35 for the first bag unless you’ve booked a premium cabin or hold a qualifying credit card.

WiFi on board 📡

Both airlines offer WiFi on most domestic and international flights.

• Delta is rolling out free WiFi for SkyMiles members on many domestic routes, which is a standout perk.
• United charges a fee for access, though it’s generally reliable and available across more aircraft.

Lounge access 🛋️

Delta’s Sky Clubs and United’s Club lounges offer similar experiences - comfortable seating, snacks, drinks and WiFi. Access typically comes with a business class ticket, elite status or a qualifying credit card. United also offers Polaris lounges, which are a step above for long-haul business travellers.

Small perks 🎧

• Delta often edges ahead with little touches: free messaging, friendlier gate experiences and more consistent onboard service.
• United shines when you’re flying internationally, especially with Polaris perks and Star Alliance partner access.

✨Our thoughts: If lounges and WiFi matter to you, Delta has a slight lead, especially on domestic routes. For long-haul travel perks, United holds its ground.

Fees and Extra Charges

Nobody likes surprise fees. With Delta and United, the small print can add up.

Baggage fees 💰

• As mentioned earlier, Delta charges around $35 for your first checked bag (unless you’re flying in a premium cabin or have a Delta credit card). Basic Economy includes a carry-on plus personal item.
• United has a similar checked bag fee of $35, but Basic Economy only includes a personal item (unless you're flying internationally or have elite status). You’ll likely need to check in and pay for carry-on luggage.

Change and cancellation fees 🚫

• Delta and United both removed change fees on most main cabin and above fares (domestic and short-haul international). But Basic Economy still comes with no changes allowed, unless you buy a flexible version during a promo.

Other fees 🫰

• WiFi, food and drinks are extra on both airlines in most cabins (except for some perks in Comfort+, Premium cabins and for elite members).
• Priority boarding, extra legroom and lounge access? Expect to pay, unless your ticket or card gets you in.

✨Our thoughts: Both airlines are fairly matched on fees, but United’s Basic Economy is a bit more restrictive. Delta gives a little more flexibility, especially if you’re bringing a bag onboard.

Safety, Support and Overall Experience

Both Delta and United are certified safe, flying millions of passengers every year under strict FAA regulations. However, safety isn’t just about checklists. It’s also about trust, and here, public perception can play a role.

Safety and trust 🔐

• Delta often scores higher in customer satisfaction and is consistently ranked as one of the most reliable US airlines. Its reputation for well-maintained aircraft, smooth operations and fewer delays builds confidence with regular flyers.
• United is just as safe when it comes to flight operations, but it has scored lower than Delta in recent customer satisfaction surveys. According to the 2023 ACSI report, United ranked below the industry average, with customers pointing to inconsistent service and issue resolution as key concerns.

Customer support 📞

• Delta has the edge when things don’t go to plan. Passengers often report faster response times, better issue resolution and friendlier agents.
• United has improved, especially with digital tools and rebooking options, however, phone support can still be hit or miss.

💡Need a hand? You can rely on our Customer Service team to support you with any queries you may have before you fly.

Overall experience 🧑‍✈️

• Travellers tend to describe Delta as more consistent, from check-in to landing. Onboard crews are often praised for being professional and approachable.
• United’s experience can vary more depending on the route and aircraft - premium cabin passengers tend to rate their service highly, especially on international flights.

✨Our thoughts: Both airlines get you there safely, but Delta earns more points for service and support, particularly if your plans change or things go sideways.

Delta vs United: Which Should You Choose? 🤔

Delta and United both get you where you need to go but how they get you there can feel pretty different.

🔴 Choose Delta if you care most about:

• On-time flights
• Friendly customer service
• Smoother domestic travel
• Free in-flight messaging and WiFi (on select routes)

🔵 Choose United if you prioritise:

• More international destinations
• Access to Polaris business class
• Strong global airline partnerships
• Flexible upgrade and loyalty options

There’s no wrong choice - both airlines are safe, reliable and offer plenty of perks. It just comes down to what matters most for your travel plan.

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