Quick answer
Blue Lights season 4 premieres in the U.S. on Thursday, November 12, 2026 on BritBox (6 episodes).
New episodes follow weekly through December 17, 2026 (6 episodes).
- U.S. premiere
- November 12, 2026
- Where
- BritBox
- Time
- Not announced
- Episodes
- 6
- Finale
- December 17, 2026
- U.K. premiere
- September 29, 2026
Season 4 episode schedule (U.S.)
| Ep. | Title | U.S. date | Time | Status |
|---|---|---|---|---|
| 1 | Eyes | [1][3][6] | Time not announced | Next |
| 2 | Numbers | [1][6] | Time not announced | Projected |
| 3 | Everybody Knows | [1][6] | Time not announced | Projected |
| 4 | So Far | [1][6] | Time not announced | Projected |
| 5 | Ghosts | [1][6] | Time not announced | Projected |
| 6 | The Line | [1][6] | Time not announced | Announced |
"Projected" dates follow the announced weekly pattern but were not individually listed by the platform. We replace them when a listing is published.
Broadcast times are the network's national slot and your local station may differ. Streaming times are converted to your time zone when your browser allows it.
Where to watch season 4
Common questions
When is Blue Lights season 4 coming to the U.S.?
Thursday, November 12, 2026, on BritBox. One new episode arrives each week, ending with the finale on December 17.
How many episodes are in Blue Lights season 4?
Six, the same as earlier seasons.
Can I watch Blue Lights season 4 on BBC iPlayer in the U.S.?
No. BBC iPlayer only works in the U.K. In the U.S., BritBox is the place to stream it, and it also has seasons 1 to 3.
Who is back for season 4?
Siân Brooke, Katherine Devlin, Martin McCann and Nathan Braniff lead the cast, and Richard Dormer and Jonathan Harden return from season 1.
When is the next episode of Blue Lights?
Episode 1, "Eyes", of season 4 is on Thursday, November 12, 2026 on BritBox.
When is the first episode of Blue Lights season 4?
Season 4 episode 1 premieres on Thursday, November 12, 2026 on BritBox.
About Blue Lights
A police drama following response officers in Belfast as they handle routine calls, organised crime and the pressures of policing in Northern Ireland.
Other seasons
Related guides
- Is Blue Lights based on a true story? The research behind the Belfast police drama
- Every British crime and mystery premiere coming to U.S. TV this fall
- BritBox vs. Acorn TV vs. PBS MASTERPIECE (PBS Passport): which is best for British mysteries?
- Is BritBox worth it this fall? What's new on BritBox in fall 2026
Sources
Update history
- Re-checked the November 12 BritBox premiere against TV Insider (Nov. 4, 2026); unchanged.
- BritBox U.S. premiere set for November 12, 2026, weekly on Thursdays through December 17 (Vital Thrills, Telly Visions). Episodes 2 to 5 are projected from the weekly pattern.
- Hub published. U.S. date for season 4 not yet announced.
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