The U.S. Department of Transportation's latest Air Travel Consumer Report gives summer flyers a clear warning: airline reliability improved for some carriers in March, but the first quarter of 2026 still ran behind last year's on-time performance.
The May 2026 report, posted by DOT on May 28, covers March flight-delay data and January-through-March performance for major U.S. reporting carriers. Across reported marketing-carrier networks, 73.4% of March flights arrived on time at U.S. airports. For the full first quarter, the combined on-time arrival rate was 75.56%, down from 78.51% during the same period in 2025.
That may sound like a narrow gap, but for travelers it represents a meaningful difference during a summer season shaped by high demand, major events, airport construction, weather risk and tight aircraft utilization. A few percentage points can decide whether a family makes a cruise departure, whether a business traveler reaches a connection, or whether a delayed first leg turns into an overnight misconnect.
Alaska led the first-quarter ranking
DOT's first-quarter marketing-carrier ranking put the Alaska Airlines network in first place, with 79.64% of reported flights arriving on time from January through March. Southwest followed at 78.39%, United's network came in at 77.91%, and Delta's network posted 76.74%.
American's network reported 73.07% on-time arrivals for the quarter, while Frontier posted 71.09%, JetBlue 65.00% and Spirit 58.94%. The March-only ranking showed a similar split: Alaska's network led at 78.9%, United followed at 75.6%, Delta at 74.9%, Southwest at 73.0% and American at 72.6%. Spirit's March figure was 48.4%, the lowest among the listed marketing carriers.
The DOT tables include branded codeshare partners for network carriers, so the published numbers are especially useful for travelers buying tickets under a major airline brand but flying part of the trip on a regional partner. For many U.S. itineraries, that distinction matters as much as the airport connection itself.
Why this matters before peak summer trips
Summer travel reliability is not just about whether an airline has a good month on paper. It affects how travelers should build itineraries. Families heading to theme parks, cruise ports, weddings, national parks, concerts or World Cup-related events have less room for recovery when the first flight of the day slips.
The report also lands at a moment when several U.S. airports are already managing capacity, construction or heavy seasonal schedules. Travelers connecting through large hubs should watch live airport conditions and avoid treating short connections as risk-free. Odyssey travelers can check live boards for major gateways including Atlanta, Dallas/Fort Worth, Denver, Chicago O'Hare, Los Angeles and New York JFK before heading to the airport.
Travelers should read the data carefully
DOT's report is valuable because it uses standardized data, but it is not a perfect forecast for any one flight. The March and first-quarter figures describe past performance across networks and airports. A specific summer trip can still be affected by thunderstorms, air traffic programs, runway work, crew availability, mechanical issues or missed connections on partner airlines.
The practical takeaway is to use the report as a planning signal. A traveler choosing between two similar itineraries should look beyond the cheapest fare and ask whether the schedule has enough recovery time. A low fare with a 38-minute connection at a crowded hub may be a poor trade if the trip includes a prepaid hotel, a cruise embarkation, a tour departure or an important event.
- For domestic leisure trips, choose earlier flights when the schedule allows.
- For cruises and international departures, consider arriving a day early rather than the morning of departure.
- For tight connections, check whether later same-day backup options exist on the same airline.
- For family trips, avoid splitting passengers across separate reservations unless necessary.
- For package travel, confirm who handles rebooking if a flight delay affects hotels, transfers or excursions.
What travel advisors and sellers should watch
For travel advisors, the DOT report is a useful conversation starter with clients who focus only on fare. The difference between a cheap itinerary and a resilient itinerary can become very visible when delays stack up. Advisors should flag tight connections, overnight-risk itineraries and same-day cruise arrivals, especially for travelers with checked bags, mobility needs or limited schedule flexibility.
Corporate travel managers can also use the report as part of a broader review of preferred routings. If a route frequently depends on late-day connections or a carrier network with weaker on-time performance, the apparent savings may be offset by missed meetings, hotel costs or employee downtime.
The bottom line for U.S. flyers
DOT's May report does not suggest that Americans should avoid flying this summer. It does suggest that travelers should build trips with realistic buffers. First-quarter on-time performance was weaker than a year earlier, and March results showed large differences among carriers.
For summer 2026, the safest strategy is simple: compare schedules as carefully as prices, avoid the tightest connections when the trip really matters, monitor live airport boards, and keep enough time in the itinerary for the travel system to absorb a delay without ruining the purpose of the trip.