KLM flight KL 6721: Multiple routes

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FLIGHT SCHEDULE
Direct Codeshare Flights:
Daily 06:00 Ontario, Los Angeles (ONT) 2 08:55 Seattle-Tacoma (SEA)
KL 6721 Non-stop Embraer EMB 175 (E7W) 2:55 Effective 2026-03-29 through 2026-04-12
Codeshare flight, operated by Delta Air Lines.(DL 4042)
Daily 07:00 Ontario, Los Angeles (ONT) 2 10:01 Seattle-Tacoma (SEA)
KL 6721 Non-stop Airbus A220-300 (223) 3:01 Effective 2026-04-13 through 2026-05-06
Codeshare flight, operated by Delta Air Lines.(DL 1071)
Daily 07:00 Ontario, Los Angeles (ONT) 2 10:01 Seattle-Tacoma (SEA)
KL 6721 Non-stop Embraer EMB 175 (E7W) 3:01 Effective 2026-05-07 through 2026-10-05
Codeshare flight, operated by Delta Air Lines.(DL 3816)
Daily 07:00 Ontario, Los Angeles (ONT) 2 10:05 Seattle-Tacoma (SEA)
KL 6721 Non-stop Embraer EMB 175 (E7W) 3:05 Effective 2026-10-06 through 2026-10-24
Codeshare flight, operated by Delta Air Lines.(DL 3816)
Mon-Fri,Sun 14:00 Omaha (OMA) 17:01 Detroit (DTW) M
KL 6721 Non-stop Canadair CRJ 900 (CR9) 2:01 Effective from 2026-10-25
Codeshare flight, operated by Delta Air Lines.(DL 3762)
Mon,Tue,Thu-Sun 19:45 Detroit (DTW) M 21:32 Charlotte (CLT)
KL 6721 Non-stop Boeing 717 (717) 1:47 Effective 2026-01-06 through 2026-01-13
Codeshare flight, operated by Delta Air Lines.(DL 2352)
Daily 19:45 Detroit (DTW) M 21:32 Charlotte (CLT)
KL 6721 Non-stop Boeing 717 (717) 1:47 Effective 2026-01-14 through 2026-03-07
Codeshare flight, operated by Delta Air Lines.(DL 2352)
Tue,Thu,Sat 19:48 Detroit (DTW) M 21:31 Charlotte (CLT)
KL 6721 Non-stop Boeing 717 (717) 1:43 Effective 2026-03-10 through 2026-03-28
Codeshare flight, operated by Delta Air Lines.(DL 2352)
Daily 19:59 Detroit (DTW) M 21:50 Charlotte (CLT)
KL 6721 Non-stop Boeing 717 (717) 1:51 Valid until 2026-01-03
Codeshare flight, operated by Delta Air Lines.(DL 2352)
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This flight number is listed as serving the following routes:


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KLM flight KL 6721: Multiple routes
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Select flight date:
FLIGHT SCHEDULE
Direct Codeshare Flights:
KLM KL6721
06:00
Ontario, Los Angeles (ONT) 2

08:55
Seattle-Tacoma (SEA)
Effective 2026-03-29 through 2026-04-12
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Codeshare flight, operated by Delta Air Lines. (DL 4042)
Duration: 2:55, non-stop
Embraer EMB 175 (E7W)
Direct Codeshare Flights:
KLM KL6721
07:00
Ontario, Los Angeles (ONT) 2

10:01
Seattle-Tacoma (SEA)
Effective 2026-04-13 through 2026-05-06
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Codeshare flight, operated by Delta Air Lines. (DL 1071)
Duration: 3:01, non-stop
Airbus A220-300 (223)
Direct Codeshare Flights:
KLM KL6721
07:00
Ontario, Los Angeles (ONT) 2

10:01
Seattle-Tacoma (SEA)
Effective 2026-05-07 through 2026-10-05
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Codeshare flight, operated by Delta Air Lines. (DL 3816)
Duration: 3:01, non-stop
Embraer EMB 175 (E7W)
Direct Codeshare Flights:
KLM KL6721
07:00
Ontario, Los Angeles (ONT) 2

10:05
Seattle-Tacoma (SEA)
Effective 2026-10-06 through 2026-10-24
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Codeshare flight, operated by Delta Air Lines. (DL 3816)
Duration: 3:05, non-stop
Embraer EMB 175 (E7W)
Direct Codeshare Flights:
KLM KL6721
14:00
Omaha (OMA)

17:01
Detroit (DTW) M
Effective from 2026-10-25
Mon
Tue
Wed
Thu
Fri
Sat
-
Sun
Codeshare flight, operated by Delta Air Lines. (DL 3762)
Duration: 2:01, non-stop
Canadair CRJ 900 (CR9)
Direct Codeshare Flights:
KLM KL6721
19:45
Detroit (DTW) M

21:32
Charlotte (CLT)
Effective 2026-01-06 through 2026-01-13
Mon
Tue
Wed
-
Thu
Fri
Sat
Sun
Codeshare flight, operated by Delta Air Lines. (DL 2352)
Duration: 1:47, non-stop
Boeing 717 (717)
Direct Codeshare Flights:
KLM KL6721
19:45
Detroit (DTW) M

21:32
Charlotte (CLT)
Effective 2026-01-14 through 2026-03-07
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Codeshare flight, operated by Delta Air Lines. (DL 2352)
Duration: 1:47, non-stop
Boeing 717 (717)
Direct Codeshare Flights:
KLM KL6721
19:48
Detroit (DTW) M

21:31
Charlotte (CLT)
Effective 2026-03-10 through 2026-03-28
Mon
-
Tue
Wed
-
Thu
Fri
-
Sat
Sun
-
Codeshare flight, operated by Delta Air Lines. (DL 2352)
Duration: 1:43, non-stop
Boeing 717 (717)
Direct Codeshare Flights:
KLM KL6721
19:59
Detroit (DTW) M

21:50
Charlotte (CLT)
Valid until 2026-01-03
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Codeshare flight, operated by Delta Air Lines. (DL 2352)
Duration: 1:51, non-stop
Boeing 717 (717)
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This flight number is listed as serving the following routes:
  • Detroit (DTW) - Charlotte (CLT)
  • Omaha (OMA) - Detroit (DTW)
  • Ontario, Los Angeles (ONT) - Seattle-Tacoma (SEA)
All KLM flights
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