KLM flight KL 6623: Multiple routes

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Select flight date:
FLIGHT SCHEDULE
Direct Codeshare Flights:
Daily 09:47 Atlanta (ATL) I 11:55 San Jose (SJO) M
KL 6623 Non-stop Boeing 757 (757) 4:08 Effective 2026-03-08 through 2026-03-28
Codeshare flight, operated by Delta Air Lines.(DL 1937)
Daily 09:52 Atlanta (ATL) I 12:56 San Jose (SJO) M
KL 6623 Non-stop Boeing 757 (757) 4:04 Valid until 2026-01-04
Codeshare flight, operated by Delta Air Lines.(DL 1937)
Daily 09:59 Atlanta (ATL) I 13:00 San Jose (SJO) M
KL 6623 Non-stop Boeing 757 (757) 4:01 Effective 2026-01-05 through 2026-02-11
Codeshare flight, operated by Delta Air Lines.(DL 1937)
Tue-Sun 10:00 Atlanta (ATL) I 13:00 San Jose (SJO) M
KL 6623 Non-stop Boeing 757 (757) 4:00 Effective 2026-02-12 through 2026-02-25
Codeshare flight, operated by Delta Air Lines.(DL 1937)
Tue-Sun 10:00 Atlanta (ATL) I 13:00 San Jose (SJO) M
KL 6623 Non-stop Boeing 757 (757) 4:00 Effective 2026-02-27 through 2026-03-07
Codeshare flight, operated by Delta Air Lines.(DL 1937)
Mon 10:10 Atlanta (ATL) I 13:10 San Jose (SJO) M
KL 6623 Non-stop Boeing 757 (757) 4:00 Effective 2026-02-16 through 2026-03-02
Codeshare flight, operated by Delta Air Lines.(DL 1937)
Mon-Fri,Sun 15:15 New York John F. Kennedy (JFK) 4 17:10 Chicago O'Hare (ORD) 5
KL 6623 Non-stop Canadair CRJ 900 (CR9) 2:55 Effective 2026-03-29 through 2026-04-12
Codeshare flight, operated by Delta Air Lines.(DL 4931)
Daily 15:40 New York John F. Kennedy (JFK) 4 17:41 Chicago O'Hare (ORD) 5
KL 6623 Non-stop Embraer EMB 175 (E75) 3:01 Effective 2026-04-13 through 2026-10-05
Codeshare flight, operated by Delta Air Lines.(DL 5783)
Daily 15:40 New York John F. Kennedy (JFK) 4 17:34 Chicago O'Hare (ORD) 5
KL 6623 Non-stop Embraer EMB 175 (E75) 2:54 Effective 2026-10-06 through 2026-10-24
Codeshare flight, operated by Delta Air Lines.(DL 5783)
Sat 18:20 New York John F. Kennedy (JFK) 4 20:15 Chicago O'Hare (ORD) 5
KL 6623 Non-stop Airbus A220-100 (221) 2:55 Effective 2026-04-04 through 2026-04-11
Codeshare flight, operated by Delta Air Lines.(DL 623)
Daily 21:15 Atlanta (ATL) S 22:39 Charleston (CRW)
KL 6623 Non-stop Canadair CRJ 900 (CR9) 1:24 Effective from 2026-10-25
Codeshare flight, operated by Delta Air Lines.(DL 3810)
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This flight number is listed as serving the following routes:


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KLM flight KL 6623: Multiple routes
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Select flight date:
FLIGHT SCHEDULE
Direct Codeshare Flights:
KLM KL6623
09:47
Atlanta (ATL) I

11:55
San Jose (SJO) M
Effective 2026-03-08 through 2026-03-28
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Codeshare flight, operated by Delta Air Lines. (DL 1937)
Duration: 4:08, non-stop
Boeing 757 (757)
Direct Codeshare Flights:
KLM KL6623
09:52
Atlanta (ATL) I

12:56
San Jose (SJO) M
Valid until 2026-01-04
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Codeshare flight, operated by Delta Air Lines. (DL 1937)
Duration: 4:04, non-stop
Boeing 757 (757)
Direct Codeshare Flights:
KLM KL6623
09:59
Atlanta (ATL) I

13:00
San Jose (SJO) M
Effective 2026-01-05 through 2026-02-11
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Codeshare flight, operated by Delta Air Lines. (DL 1937)
Duration: 4:01, non-stop
Boeing 757 (757)
Direct Codeshare Flights:
KLM KL6623
10:00
Atlanta (ATL) I

13:00
San Jose (SJO) M
Effective 2026-02-12 through 2026-02-25
Mon
-
Tue
Wed
Thu
Fri
Sat
Sun
Codeshare flight, operated by Delta Air Lines. (DL 1937)
Duration: 4:00, non-stop
Boeing 757 (757)
Direct Codeshare Flights:
KLM KL6623
10:00
Atlanta (ATL) I

13:00
San Jose (SJO) M
Effective 2026-02-27 through 2026-03-07
Mon
-
Tue
Wed
Thu
Fri
Sat
Sun
Codeshare flight, operated by Delta Air Lines. (DL 1937)
Duration: 4:00, non-stop
Boeing 757 (757)
Direct Codeshare Flights:
KLM KL6623
10:10
Atlanta (ATL) I

13:10
San Jose (SJO) M
Effective 2026-02-16 through 2026-03-02
Mon
Tue
-
Wed
-
Thu
-
Fri
-
Sat
-
Sun
-
Codeshare flight, operated by Delta Air Lines. (DL 1937)
Duration: 4:00, non-stop
Boeing 757 (757)
Direct Codeshare Flights:
KLM KL6623
15:15
New York John F. Kennedy (JFK) 4

17:10
Chicago O'Hare (ORD) 5
Effective 2026-03-29 through 2026-04-12
Mon
Tue
Wed
Thu
Fri
Sat
-
Sun
Codeshare flight, operated by Delta Air Lines. (DL 4931)
Duration: 2:55, non-stop
Canadair CRJ 900 (CR9)
Direct Codeshare Flights:
KLM KL6623
15:40
New York John F. Kennedy (JFK) 4

17:41
Chicago O'Hare (ORD) 5
Effective 2026-04-13 through 2026-10-05
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Codeshare flight, operated by Delta Air Lines. (DL 5783)
Duration: 3:01, non-stop
Embraer EMB 175 (E75)
Direct Codeshare Flights:
KLM KL6623
15:40
New York John F. Kennedy (JFK) 4

17:34
Chicago O'Hare (ORD) 5
Effective 2026-10-06 through 2026-10-24
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Codeshare flight, operated by Delta Air Lines. (DL 5783)
Duration: 2:54, non-stop
Embraer EMB 175 (E75)
Direct Codeshare Flights:
KLM KL6623
18:20
New York John F. Kennedy (JFK) 4

20:15
Chicago O'Hare (ORD) 5
Effective 2026-04-04 through 2026-04-11
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Codeshare flight, operated by Delta Air Lines. (DL 623)
Duration: 2:55, non-stop
Airbus A220-100 (221)
Direct Codeshare Flights:
KLM KL6623
21:15
Atlanta (ATL) S

22:39
Charleston (CRW)
Effective from 2026-10-25
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Codeshare flight, operated by Delta Air Lines. (DL 3810)
Duration: 1:24, non-stop
Canadair CRJ 900 (CR9)
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This flight number is listed as serving the following routes:
  • Atlanta (ATL) - Charleston (CRW)
  • Atlanta (ATL) - San Jose (SJO)
  • New York John F. Kennedy (JFK) - Chicago O'Hare (ORD)
All KLM flights
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