KLM flight KL 6521: Multiple routes

Ad box here 1220564027 I FlightWNum Top Box
Select flight date:
FLIGHT SCHEDULE
Direct Codeshare Flights:
Daily 11:43 Syracuse (SYR) 13:09 New York John F. Kennedy (JFK) 4
KL 6521 Non-stop Canadair CRJ 900 (CR9) 1:26 Effective 2026-01-05 through 2026-02-11
Codeshare flight, operated by Delta Air Lines.(DL 5436)
Daily 11:45 Syracuse (SYR) 13:09 New York John F. Kennedy (JFK) 4
KL 6521 Non-stop Canadair CRJ 900 (CR9) 1:24 Effective 2026-02-12 through 2026-03-07
Codeshare flight, operated by Delta Air Lines.(DL 5436)
Mon,Thu 11:45 Cleveland (CLE) 13:39 Boston Logan (BOS) A
KL 6521 Non-stop Embraer EMB 175 (E75) 1:54 Effective 2026-04-13 through 2026-10-05
Codeshare flight, operated by Delta Air Lines.(DL 5674)
Mon,Thu 11:45 Cleveland (CLE) 13:37 Boston Logan (BOS) A
KL 6521 Non-stop Embraer EMB 175 (E75) 1:52 Effective 2026-10-08 through 2026-10-22
Codeshare flight, operated by Delta Air Lines.(DL 5674)
Sat 13:00 Cleveland (CLE) 14:54 Boston Logan (BOS) A
KL 6521 Non-stop Embraer EMB 175 (E75) 1:54 Effective 2026-04-18 through 2026-06-06
Codeshare flight, operated by Delta Air Lines.(DL 5674)
Mon,Wed,Fri,Sun 14:00 Cleveland (CLE) 15:50 Boston Logan (BOS) A
KL 6521 Non-stop Embraer EMB 175 (E75) 1:50 Effective 2026-03-29 through 2026-04-12
Codeshare flight, operated by Delta Air Lines.(DL 5641)
Daily 15:15 Seattle-Tacoma (SEA) 16:43 Medford (MFR)
KL 6521 Non-stop Embraer EMB 175 (E7W) 1:28 Effective from 2026-10-25
Codeshare flight, operated by Delta Air Lines.(DL 3770)
Wed,Fri,Sun 17:00 Cleveland (CLE) 18:57 Boston Logan (BOS) A
KL 6521 Non-stop Embraer EMB 175 (E75) 1:57 Effective 2026-04-15 through 2026-05-22
Codeshare flight, operated by Delta Air Lines.(DL 5641)
Wed,Fri,Sun 17:00 Cleveland (CLE) 18:57 Boston Logan (BOS) A
KL 6521 Non-stop Embraer EMB 175 (E75) 1:57 Effective 2026-05-27 through 2026-07-03
Codeshare flight, operated by Delta Air Lines.(DL 5641)
Wed,Fri 17:00 Cleveland (CLE) 18:57 Boston Logan (BOS) A
KL 6521 Non-stop Embraer EMB 175 (E75) 1:57 Effective 2026-07-08 through 2026-10-02
Codeshare flight, operated by Delta Air Lines.(DL 5641)
Wed,Fri 17:00 Cleveland (CLE) 18:54 Boston Logan (BOS) A
KL 6521 Non-stop Embraer EMB 175 (E75) 1:54 Effective 2026-10-07 through 2026-10-23
Codeshare flight, operated by Delta Air Lines.(DL 5641)
Ad flat here 1377413384 I FlightWNum Lower
Parallax here -
This flight number is listed as serving the following routes:


Feedback - Disclaimer - Privacy - new_base.html - DESKTOP - CACHE: False - LANG: en - IS_EU: False
FlightMapper.net Flight Search Countries Airlines
LANGUAGES
KLM flight KL 6521: Multiple routes
Ad mobi flat here (320x100px) 6074960173 M FlightWNum Top Flat
Select flight date:
FLIGHT SCHEDULE
Direct Codeshare Flights:
KLM KL6521
11:43
Syracuse (SYR)

13:09
New York John F. Kennedy (JFK) 4
Effective 2026-01-05 through 2026-02-11
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Codeshare flight, operated by Delta Air Lines. (DL 5436)
Duration: 1:26, non-stop
Canadair CRJ 900 (CR9)
Direct Codeshare Flights:
KLM KL6521
11:45
Syracuse (SYR)

13:09
New York John F. Kennedy (JFK) 4
Effective 2026-02-12 through 2026-03-07
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Codeshare flight, operated by Delta Air Lines. (DL 5436)
Duration: 1:24, non-stop
Canadair CRJ 900 (CR9)
Direct Codeshare Flights:
KLM KL6521
11:45
Cleveland (CLE)

13:39
Boston Logan (BOS) A
Effective 2026-04-13 through 2026-10-05
Mon
Tue
-
Wed
-
Thu
Fri
-
Sat
-
Sun
-
Codeshare flight, operated by Delta Air Lines. (DL 5674)
Duration: 1:54, non-stop
Embraer EMB 175 (E75)
Direct Codeshare Flights:
KLM KL6521
11:45
Cleveland (CLE)

13:37
Boston Logan (BOS) A
Effective 2026-10-08 through 2026-10-22
Mon
Tue
-
Wed
-
Thu
Fri
-
Sat
-
Sun
-
Codeshare flight, operated by Delta Air Lines. (DL 5674)
Duration: 1:52, non-stop
Embraer EMB 175 (E75)
Direct Codeshare Flights:
KLM KL6521
13:00
Cleveland (CLE)

14:54
Boston Logan (BOS) A
Effective 2026-04-18 through 2026-06-06
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Codeshare flight, operated by Delta Air Lines. (DL 5674)
Duration: 1:54, non-stop
Embraer EMB 175 (E75)
Direct Codeshare Flights:
KLM KL6521
14:00
Cleveland (CLE)

15:50
Boston Logan (BOS) A
Effective 2026-03-29 through 2026-04-12
Mon
Tue
-
Wed
Thu
-
Fri
Sat
-
Sun
Codeshare flight, operated by Delta Air Lines. (DL 5641)
Duration: 1:50, non-stop
Embraer EMB 175 (E75)
Direct Codeshare Flights:
KLM KL6521
15:15
Seattle-Tacoma (SEA)

16:43
Medford (MFR)
Effective from 2026-10-25
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Codeshare flight, operated by Delta Air Lines. (DL 3770)
Duration: 1:28, non-stop
Embraer EMB 175 (E7W)
Direct Codeshare Flights:
KLM KL6521
17:00
Cleveland (CLE)

18:57
Boston Logan (BOS) A
Effective 2026-04-15 through 2026-05-22
Mon
-
Tue
-
Wed
Thu
-
Fri
Sat
-
Sun
Codeshare flight, operated by Delta Air Lines. (DL 5641)
Duration: 1:57, non-stop
Embraer EMB 175 (E75)
Direct Codeshare Flights:
KLM KL6521
17:00
Cleveland (CLE)

18:57
Boston Logan (BOS) A
Effective 2026-05-27 through 2026-07-03
Mon
-
Tue
-
Wed
Thu
-
Fri
Sat
-
Sun
Codeshare flight, operated by Delta Air Lines. (DL 5641)
Duration: 1:57, non-stop
Embraer EMB 175 (E75)
Direct Codeshare Flights:
KLM KL6521
17:00
Cleveland (CLE)

18:57
Boston Logan (BOS) A
Effective 2026-07-08 through 2026-10-02
Mon
-
Tue
-
Wed
Thu
-
Fri
Sat
-
Sun
-
Codeshare flight, operated by Delta Air Lines. (DL 5641)
Duration: 1:57, non-stop
Embraer EMB 175 (E75)
Direct Codeshare Flights:
KLM KL6521
17:00
Cleveland (CLE)

18:54
Boston Logan (BOS) A
Effective 2026-10-07 through 2026-10-23
Mon
-
Tue
-
Wed
Thu
-
Fri
Sat
-
Sun
-
Codeshare flight, operated by Delta Air Lines. (DL 5641)
Duration: 1:54, non-stop
Embraer EMB 175 (E75)
Ad mobi box here (300x250px) 8888825773 M FlightWNum Bottom Box
Parallax here -
This flight number is listed as serving the following routes:
  • Cleveland (CLE) - Boston Logan (BOS)
  • Seattle-Tacoma (SEA) - Medford (MFR)
  • Syracuse (SYR) - New York John F. Kennedy (JFK)
All KLM flights
Feedback     -     Disclaimer     -     Privacy - new_base.html - MOBILE

- CACHE: False - LANG: en - IS_EU: False