Reliable Flight Search results
Best trips
18 nonstop, 28 with 1 connection · ranked by overall best · published legroom for 46 of 46
Fares seen on this date: nonstop from 165 · any route from 126 (recent searches, one way, per person; each card opens the live price)
Our best overall pick
92% chance you arrive on time · nonstop · 30 in legroom · planes about 1 years old · 4h 51m
Top pick#1 · Nonstop · 4h 51m
6:25 AM → 9:16 AM
77
score
price
live on Aviasales
92%
arrive on time
93% on time · 1.1% cancel6:25 AM ORD → 9:16 AM SFO4h 51m
United 246
Airbus A321neo · 1–22 yrs oldLegroom 30–31 in · 16.3–18.4 in wide · United EconomyFind United 246 fares Opens this date on Aviasales#2 · Nonstop · 4h 56m
7:40 AM → 10:38 AM
71
score
price
live on Aviasales
88%
arrive on time
89% on time · 0.7% cancel7:40 AM ORD → 10:38 AM SFO4h 56m
United 1116
Airbus A321neo or Boeing 757-300 · 1–25 yrs oldLegroom 30–31 in · 16.3–18.4 in wide · United EconomyFind United 1116 fares Opens this date on Aviasales#3 · Nonstop · 4h 40m
6:45 AM → 9:25 AM
65
score
price
live on Aviasales
85%
arrive on time
87% on time · 1.7% cancel6:45 AM ORD → 9:25 AM SFO4h 40m
American 2543
Boeing 737-800 · 10–26 yrs oldLegroom 30–31 in · 16.3–18.7 in wide · Main CabinFind American 2543 fares Opens this date on Aviasales#4 · Nonstop · 4h 43m
12:45 PM → 3:28 PM
57
score
price
live on Aviasales
76%
arrive on time
76% on time · 0.5% cancel12:45 PM ORD → 3:28 PM SFO4h 43m
United 1902 · also flew as 1097
Airbus A321neo · 0–30 yrs oldLegroom 30–31 in · 17–18.4 in wide · United EconomyFind United 1902 fares Opens this date on Aviasales#5 · Nonstop · 4h 55m
12:05 PM → 3:00 PM
54
score
price
live on Aviasales
77%
arrive on time
78% on time · 0.9% cancel12:05 PM ORD → 3:00 PM SFO4h 55m
United 2860
Boeing 737-900ER · 10–14 yrs oldLegroom 30–31 in · 16.3–17.8 in wide · United EconomyFind United 2860 fares Opens this date on Aviasales#6 · Nonstop · 4h 57m
2:15 PM → 5:12 PM
53
score
price
live on Aviasales
74%
arrive on time
75% on time · 1.7% cancel2:15 PM ORD → 5:12 PM SFO4h 57m
United 1577
Airbus A321neo · 0–3 yrs oldLegroom 30–31 in · 16.3–18.4 in wide · United EconomyFind United 1577 fares Opens this date on Aviasales#7 · Nonstop · 4h 59m
9:40 PM → 12:39 AM
52
score
price
live on Aviasales
74%
arrive on time
75% on time · 2.0% cancel9:40 PM ORD → 12:39 AM SFO4h 59m
United 2106
Airbus A321neo or Boeing 737 MAX 9 · 1–3 yrs oldLegroom 30–31 in · 16.3–18.4 in wide · United EconomyFind United 2106 fares Opens this date on Aviasales#8 · Nonstop · 4h 57m
6:55 AM → 9:52 AM
50
score
price
live on Aviasales
75%
arrive on time
75% on time · 1.0% cancel6:55 AM ORD → 9:52 AM SFO4h 57m
American 1253
Boeing 737-800 or 737 MAX 8 · 1–26 yrs oldLegroom 30–31 in · 16.3–18.7 in wide · Main CabinFind American 1253 fares Opens this date on Aviasales#9 · Nonstop · 4h 57m
8:05 AM → 11:02 AM
48
score
price
live on Aviasales
73%
arrive on time
74% on time · 1.4% cancel8:05 AM ORD → 11:02 AM SFO4h 57m
American 1557
Boeing 737-800 · 8–26 yrs oldLegroom 30 in · 16.6–17.8 in wide · Main CabinFind American 1557 fares Opens this date on Aviasales#10 · Nonstop · 4h 57m
4:40 PM → 7:37 PM
48
score
price
live on Aviasales
70%
arrive on time
71% on time · 0.7% cancel4:40 PM ORD → 7:37 PM SFO4h 57m
United 2251 · also flew as 1863
Airbus A321neo · 0–6 yrs oldLegroom 30–31 in · 16.3–18.4 in wide · United EconomyFind United 2251 fares Opens this date 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.
ORD → SFO
Chicago to San Francisco: 5,607 nonstop flights a year
On time (12 months)
70%
Cancelled
1.3%
avg delay 23 min
Best time to leave
Before 9 AM
84% on time vs 54% 6 to 9 PM
Most reliable airline
United
71% chance on time
Lowest nonstop fare seen in the next two months: $165 (American 2158 on 2026-10-18). Fares open on our travel partner (Aviasales). Pick the flight number you chose here.
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- United Airlines71%
3,772 flights · 72% on time as flown · 1.0% cancel
- American Airlines65%
1,755 flights · 66% on time as flown · 1.8% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM84%
1,327 flights · avg delay 13 min
- 9 AM to noon69%
936 flights · avg delay 24 min
- Noon to 3 PM75%
820 flights · avg delay 22 min
- 3 to 6 PM69%
1,012 flights · avg delay 25 min
- 6 to 9 PM54%
1,173 flights · avg delay 31 min
- After 9 PM66%
339 flights · avg delay 22 min
Best day: Saturday (77%). Worst: Friday (70%).
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