Dallas to Seattle Flight Delays
Sample size: 14,163 DFW–SEA flights, January 2023 to December 2025 (BTS). 28.41% of Dallas to Seattle flights arrived at least 15 minutes late. That is 4.2 points worse than the 24.2% median for those routes, so schedule padding matters here. Departure time moves the odds more than anything else on this route: 07:00 departures run 14.24% late against 47.7% for 19:00. Saturday is the calmest day at 26.83%, Sunday the worst at 30.02%. Cancellations (2024 to 2025) peak in January at 4.97% of scheduled flights and bottom out in February at 0.3%. Last updated: 2026-10-01.
These figures are historical US domestic rates, not a forecast for one departure. Use the flight delay prediction before you book.
DFW airport delay guide · SEA airport delay guide · Predict a DFW to SEA flight
Best time to fly DFW to SEA
The best time to fly DFW to SEA is the 7 AM departure and fly on a Saturday, not a Sunday (26.83% against 30.02%): 14.24% of 7 AM flights arrived 15+ minutes late, against 47.7% at 7 PM.
Lowest observed delay rates depart 07:00, 10:00, 12:00. The highest sit at 19:00–20:00, 22:00. Only departure hours with at least 100 recorded flights are listed, so sparse hours are blank rather than estimated.
| Departure hour | Delayed 15+ min | Flights observed |
|---|---|---|
| 06:00 | 28.54% | 904 |
| 07:00 | 14.24% | 1,355 |
| 08:00 | 21.98% | 1,592 |
| 09:00 | 37.13% | 571 |
| 10:00 | 18.84% | 1,152 |
| 12:00 | 19.52% | 1,178 |
| 13:00 | 24.54% | 603 |
| 14:00 | 27.46% | 823 |
| 15:00 | 31.66% | 518 |
| 16:00 | 29.5% | 1,129 |
| 17:00 | 29.12% | 1,020 |
| 18:00 | 35.95% | 829 |
| 19:00 | 47.7% | 870 |
| 20:00 | 42.69% | 848 |
| 21:00 | 42.61% | 291 |
| 22:00 | 43.25% | 437 |
DFW to SEA flight time and distance
Scheduled gate-to-gate time from DFW to SEA is a median 4 h 24 min. Flights actually took a median 4 h 16 min gate to gate, including 3 h 43 min in the air. 2.4% ran 30 or more minutes over schedule and 68.1% arrived sooner than scheduled (BTS data, January 2023 to December 2025).
DFW to SEA is 1,660 miles (BTS data).
| Airline | Scheduled (median) | Actual (median) | In the air (median) | 30+ min over schedule | Flights |
|---|---|---|---|---|---|
| American Airlines | 4 h 24 min | 4 h 13 min | 3 h 42 min | 2.1% | 7,747 |
| Alaska Airlines | 4 h 23 min | 4 h 18 min | 3 h 44 min | 2.8% | 5,209 |
| Delta Air Lines | 4 h 27 min | 4 h 18 min | 3 h 46 min | 2.1% | 1,021 |
How late, and why
When a DFW to SEA flight was late (15+ minutes), it arrived an average of 65 minutes late (median 39). 8.9% of all completed flights arrived an hour or more late (BTS data, 2023 to 2025).
Of the delay minutes on late DFW to SEA flights, 42.1% were caused by a late incoming aircraft, 32.7% by the airline (crew, maintenance, ground handling), 16.9% by the air-traffic system (volume, non-extreme weather, airport operations), 7.9% by extreme weather and 0.4% by security (BTS data, 2023 to 2025).
| Cause | Share of delay minutes |
|---|---|
| late incoming aircraft | 42.1% |
| airline | 32.7% |
| air-traffic system | 16.9% |
| extreme weather | 7.9% |
| security | 0.4% |
BTS assigns causes to delay minutes on flights that arrived 15+ minutes late. "Air-traffic system" includes non-extreme weather that slows traffic.
DFW to SEA delays by day of week
| Day | Delayed 15+ min | Flights observed |
|---|---|---|
| Mon | 28.35% | 2,148 |
| Tue | 27.63% | 1,940 |
| Wed | 27.6% | 1,949 |
| Thu | 28.64% | 2,074 |
| Fri | 29.51% | 2,125 |
| Sat | 26.83% | 1,845 |
| Sun | 30.02% | 2,082 |
Month-by-month cancellation pattern
Share of scheduled DFW–SEA flights cancelled in each month, from BTS 2024–2025 on-time reporting. These are cancellations, not delays. Delay figures on this page cover January 2023 to December 2025.
| Month | Cancelled | Flights scheduled |
|---|---|---|
| Jan | 4.97% | 724 |
| Feb | 0.3% | 660 |
| Mar | 1.32% | 757 |
| Apr | 1.36% | 734 |
| May | 3.67% | 872 |
| Jun | 1.8% | 947 |
| Jul | 1.66% | 1,026 |
| Aug | 1.6% | 1,002 |
| Sep | 0.88% | 913 |
| Oct | 0.43% | 929 |
| Nov | 1.8% | 835 |
| Dec | 1.22% | 899 |
Airlines on DFW to SEA: delays and cancellations
American Airlines, Alaska Airlines and Delta Air Lines fly this route today. Only carriers with at least 200 scheduled flights on the pairing are listed. Delay rates cover January 2023 to December 2025; cancellation rates cover 2024 to 2025.
| Airline | Share of flights | Delayed 15+ min | Cancelled | Flights scheduled |
|---|---|---|---|---|
| American Airlines | 54% | 28.51% | 1.89% | 5,490 |
| Alaska Airlines | 35% | 30.26% | 1.7% | 3,585 |
| Delta Air Lines | 10% | 17.04% | 1.06% | 1,035 |
Related pages
- DFW delays: rate, worst hours and live risk
- SEA delays: rate, worst hours and live risk
- US airline cancellation rates
- Thanksgiving and Christmas 2026 flight delay guide
- Predict a DFW to SEA flight
Check your odds: Will my flight be delayed? · Will my flight be cancelled?
DFW vs SEA: airport conditions
Both ends of a route shape its delay profile. These are DelayGuard's operational scores for Dallas and Seattle.
| Measure | DFW (Dallas) | SEA (Seattle) |
|---|---|---|
| Congestion | high | high |
| Weather risk | moderate | moderate |
| NAS vulnerability | moderate | moderate |
| Average taxi-out | 19 min | 14 min |
| Runways | 7 | 3 |
DFW to SEA questions
- How long is the flight from Dallas to Seattle?
- Scheduled gate-to-gate time from DFW to SEA is a median 4 h 24 min, and flights actually took a median 4 h 16 min including 3 h 43 min in the air. 2.4% ran 30+ minutes over schedule (BTS data, January 2023 to December 2025).
- How often do DFW to SEA flights get delayed?
- Across 14,163 recorded DFW–SEA departures, January 2023 to December 2025 (BTS), 28.41% arrived at least 15 minutes late. Departure time matters most: 7:00 departures run 14.24% late against 47.7% for 19:00. Actual delay frequency varies by airline, time of day, and season.
- What is the best time of year to fly DFW to SEA?
- Dallas (TX) sees its highest delays during June–September (convective/thunderstorm season). Seattle (WA) peaks during November–February (coastal fog) with generally low risk year-round. The dominant seasonal risk on this route sits at the origin (Dallas) — use the DelayGuard predictor to check conditions for your specific travel date.
- Which airline is most reliable on DFW to SEA?
- On DFW→SEA, Delta Air Lines has the lowest measured delay rate at 17.04% of 1,021 flights, and Alaska Airlines the highest at 30.26% (BTS, January 2023 to December 2025). Delta Air Lines cancels the fewest at 1.06% (2024 to 2025). These are route-specific figures, not airline-wide averages.
- How late are DFW to SEA flights when they are delayed?
- When a DFW to SEA flight was late (15+ minutes), it arrived an average of 65 minutes late (median 39). 8.9% of all completed flights arrived an hour or more late (BTS data, 2023 to 2025).
- How accurate is DelayGuard's delay prediction for this route?
- DelayGuard's delay risk score comes from an ML model trained on BTS data (3.95 million US domestic flights, 2023 to mid-2025), with live weather data (within 5 days of departure) and FAA NAS advisories (within 6 hours) — a likelihood of delay, not a guarantee.
Delay figures reflect arrivals 15 or more minutes late in BTS on-time reporting. Cancellation figures are separate and count flights that never operated. Hours, days and months with fewer than 100 recorded flights are omitted rather than estimated.