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Reliable Flight Search

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The insider way to pick a flight: on-time records, the odds each connection is made, legroom and the age of the planes that actually fly the route. Things airline sites and the big booking sites don’t show you. US airlines and airports.

Find me the most reliable flights fromtoonreturning(optional)

ATL → BUF

Atlanta to Buffalo: 1,492 nonstop flights a year

On time (12 months)

77%

Cancelled

2.1%

avg delay 14 min

Best time to leave

Before 9 AM

86% on time vs 71% 3 to 6 PM

Most reliable airline

Delta

78% chance on time

Check ATL to BUF fares

Lowest nonstop fare seen in the next two months: $188 (Frontier 1408 on 2026-10-23). Fares open on our travel partner (Aviasales). Pick the flight number you chose here.

Best trips

5 nonstop, 37 with 1 connection · ranked by overall best · published legroom for 9 of 42

  1. Top pick#1 · Nonstop · 2h 01m

    9:00 AM → 11:01 AM

    82

    score

    88%

    arrive on time

    9:00 AM ATL → 11:01 AM BUF2h 01m

    Delta 1384

    Airbus A321 · 8–23 yrs oldLegroom: not published for this aircraft and cabin yet
    90% on time · 2.2% cancel
    Find Delta 1384 fares Opens this date on Aviasales

  2. #2 · Nonstop · 2h 00m

    1:56 PM → 3:53 PM

    61

    score

    76%

    arrive on time

    1:56 PM ATL → 3:53 PM BUF2h 00m

    Delta 2266 · also flew as 2084

    Airbus A321 · 8–33 yrs oldLegroom: not published for this aircraft and cabin yet
    77% on time · 1.3% cancel
    Find Delta 2266 fares Opens this date on Aviasales

  3. #3 · Nonstop · 2h 11m

    8:30 AM → 10:41 AM

    50

    score

    68%

    arrive on time

    8:30 AM ATL → 10:41 AM BUF2h 11m

    Frontier 1408

    Airbus A321neo or A320neo · 1–10 yrs oldLegroom: not published for this aircraft and cabin yet
    69% on time · 1.8% cancel
    Find Frontier 1408 fares Opens this date on Aviasales

  4. #4 · Nonstop · 2h 01m

    9:47 PM → 11:46 PM

    47

    score

    73%

    arrive on time

    9:47 PM ATL → 11:46 PM BUF2h 01m

    Delta 2334

    Airbus A321 or A320 · 8–33 yrs oldLegroom: not published for this aircraft and cabin yet
    75% on time · 2.4% cancel
    Find Delta 2334 fares Opens this date on Aviasales

  5. #5 · 1 connection · 5h 15m · one ticket (Southwest)

    6:45 AM → 12:00 PM

    46

    score

    94%

    connections made

    83%

    arrive on time

    6:45 AM ATL → 8:35 AM BWI1h 50m

    Southwest 207

    Boeing 737-700 · 3–23 yrs oldLegroom 31–36 in · 15.5–17.8 in wide · Economy (all seating types)
    88% on time · 1.8% cancel
    Connect in BWI · 2h 10m · 97% chance to make it · same ticket: the airline rebooks you if you miss it

    10:45 AM BWI → 12:00 PM BUF1h 15m

    Southwest 1076

    Boeing 737-800 or 737 MAX 8 · 2–20 yrs oldLegroom 31–36 in · 15.5–17.8 in wide · Economy (all seating types)
    88% on time · 1.3% cancel
    Find this Southwest trip Look for Southwest 207 + Southwest 1076 on Aviasales

  6. #6 · 1 connection · 5h 56m · one ticket (Delta)

    9:16 AM → 3:12 PM

    45

    score

    97%

    connections made

    87%

    arrive on time

    9:16 AM ATL → 11:11 AM DTW1h 55m

    Delta 1298

    Boeing 757-200 or 767-300ER · 22–29 yrs oldLegroom: not published for this aircraft and cabin yet
    85% on time · 0.8% cancel
    Connect in DTW · 2h 49m · 99% chance to make it · same ticket: the airline rebooks you if you miss it

    2:00 PM DTW → 3:12 PM BUF1h 12m

    SkyWest 4021 · sold as Delta Connection · also flew as 3987

    Bombardier CRJ900 · 5–20 yrs oldLegroom: not published for this aircraft and cabin yet
    90% on time · 1.2% cancel
    Find this Delta trip Look for Delta 1298 + SkyWest 4021 on Aviasales

  7. #7 · Nonstop · 2h 01m

    4:37 PM → 6:35 PM

    42

    score

    71%

    arrive on time

    4:37 PM ATL → 6:35 PM BUF2h 01m

    Delta 2050

    Airbus A320 or A321 · 6–34 yrs oldLegroom: not published for this aircraft and cabin yet
    73% on time · 2.4% cancel
    Find Delta 2050 fares Opens this date on Aviasales

  8. #8 · 1 connection · 4h 55m · one ticket (Southwest)

    6:45 AM → 11:40 AM

    40

    score

    92%

    connections made

    79%

    arrive on time

    6:45 AM ATL → 8:35 AM BWI1h 50m

    Southwest 207

    Boeing 737-700 · 3–23 yrs oldLegroom 31–36 in · 15.5–17.8 in wide · Economy (all seating types)
    88% on time · 1.8% cancel
    Connect in BWI · 1h 50m · 95% chance to make it · same ticket: the airline rebooks you if you miss it

    10:25 AM BWI → 11:40 AM BUF1h 15m

    Southwest 754

    Boeing 737-700 · 8–23 yrs oldLegroom 31–36 in · 15.5–17.8 in wide · Economy (all seating types)
    86% on time · 1.4% cancel
    Find this Southwest trip Look for Southwest 207 + Southwest 754 on Aviasales

  9. #9 · 1 connection · 7h 48m · one ticket (Delta)

    7:25 AM → 3:12 PM

    37

    score

    98%

    connections made

    88%

    arrive on time

    7:25 AM ATL → 9:20 AM DTW1h 56m

    Delta 1646

    Boeing 757-200 or 767-300ER · 7–29 yrs oldLegroom: not published for this aircraft and cabin yet
    91% on time · 0.8% cancel
    Connect in DTW · 4h 40m · 100% chance to make it · same ticket: the airline rebooks you if you miss it

    2:00 PM DTW → 3:12 PM BUF1h 12m

    SkyWest 4021 · sold as Delta Connection · also flew as 3987

    Bombardier CRJ900 · 5–20 yrs oldLegroom: not published for this aircraft and cabin yet
    90% on time · 1.2% cancel
    Find this Delta trip Look for Delta 1646 + SkyWest 4021 on Aviasales

  10. #10 · 1 connection · 5h 54m · one ticket (Delta)

    1:00 PM → 6:51 PM

    37

    score

    97%

    connections made

    77%

    arrive on time

    1:00 PM ATL → 2:53 PM DTW1h 56m

    Delta 1031

    Boeing 737-900ER or 757-200 · 8–27 yrs oldLegroom 30–31 in · 17.3 in wide · Delta Main · covers 69% of recent planes
    82% on time · 0.8% cancel
    Connect in DTW · 2h 47m · 99% chance to make it · same ticket: the airline rebooks you if you miss it

    5:40 PM DTW → 6:51 PM BUF1h 11m

    SkyWest 3969 · sold as Delta Connection · also flew as 3947

    Bombardier CRJ900 · 5–20 yrs oldLegroom: not published for this aircraft and cabin yet
    80% on time · 1.2% cancel
    Find this Delta trip Look for Delta 1031 + SkyWest 3969 on Aviasales

Aircraft and ages come from the planes each flight number actually flew in the last 3 months of data (FAA registry build years); airlines can swap planes. Legroom is the seat pitch the airline or a seat-map source publishes for that aircraft and cabin; we never estimate it, and seat maps change, so check the airline’s seat map when you book.

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • Delta Air Lines78%

    1,245 flights · 79% on time as flown · 2.1% cancel

  • Frontier Airlines68%

    246 flights · 68% on time as flown · 2.3% cancel

On time by departure time

All airlines, scheduled local departure, Jun 2025 to May 2026.

  • Before 9 AM86%

    52 flights · avg delay 9 min

  • 9 AM to noon82%

    534 flights · avg delay 12 min

  • Noon to 3 PM75%

    255 flights · avg delay 13 min

  • 3 to 6 PM71%

    286 flights · avg delay 17 min

  • After 9 PM75%

    362 flights · avg delay 16 min

Best day: Wednesday (84%). Worst: Sunday (73%).

Historical odds, not a guarantee. Built from the US DOT Bureau of Transportation Statistics on-time reports (Jun 2025 to May 2026), FAA ground stop and delay program advisories, and 20 years of airport weather observations. Covers US airlines that report to the DOT; schedules are flights operated recently, so confirm times when you book. ATIS Alerts is not affiliated with any airline. Fares are what Aviasales travelers saw in recent searches (USD, one way, 1 adult), not live quotes; the partner site shows the current price. Fare links go to our travel partner and may earn us a commission at no cost to you. Affiliate disclosure