F-4 Phantom II vs MiG-21

Spec-driven on-paper analysis — who wins what scenario.

F-4 Phantom II
F-4 Phantom II ↗
MiG-21
MiG-21 ↗

Spec table

SpecF-4 Phantom IIMiG-21
Max speed (mph) (mph) 1,472 1,351
Max speed (Mach) (Mach) 2.23 2.05
Combat radius / range (mi) 1,750 1,056
Service ceiling (ft) 60,000 62,335
MTOW (lb) 61,795 22,046
Empty weight (lb) 30,328 12,882
Payload (lb) 18,650 3,307
Endurance (hr) 2.5 2
Length (ft) 63 48.2
Wingspan (ft) 38.4 23.5
Thrust-to-weight ratio (MTOW) 0.55 0.75

Green = leader on that dimension. Higher is treated as better for all rows shown.

On-paper verdict

Beyond Visual Range (BVR, > 40 nm)

F-4 Phantom II entered service 2 years later, so it generally fields a more modern radar generation (AESA vs. mechanically-scanned arrays in older airframes) and longer-range BVR weapons. In BVR engagements, the newer-radar aircraft typically wins the first-shot opportunity.

Within Visual Range (WVR, dogfight)

MiG-21 carries a thrust-to-weight ratio of 0.75 versus 0.55 for F-4 Phantom II (using MTOW; combat-weight T/W is meaningfully higher for both). The higher T/W gives MiG-21 better instantaneous acceleration after a turn, better energy retention through a sustained turn, and a more vertical fight option. F-4 Phantom II likely depends more on energy-management discipline to come out on top in a knife fight.

High-altitude intercept

F-4 Phantom II has the speed advantage (Mach 2.23 vs 2.05); MiG-21 has the altitude advantage (62,335 ft vs 60,000 ft). Whoever owns the intercept depends on the target's flight profile.

Strike / strategic mission

F-4 Phantom II reaches 1,750 mi unrefueled — 66% more range than the other (1,056 mi). In strike profiles where the target sits deep behind enemy lines, the longer-legged aircraft engages without tanker support. F-4 Phantom II carries 18,650 lb of payload (464% more), letting it hit the target with more weapons or stand off with larger / longer-range munitions.

Caveat: these scenarios are on paper. Real combat outcomes hinge on pilot skill, training quality, doctrine, tactics, electronic warfare, radar generation upgrades, missile choices, and ground-controlled intercept support — none of which fit into a spec table. Treat as a starting point for further research, not a verdict.

Frequently asked questions

Which is more agile, F-4 Phantom II or MiG-21?

By thrust-to-weight ratio (a strong proxy for instantaneous turn performance), MiG-21 leads with 0.75 versus 0.55. Agility in actual combat also depends on wing loading, flight-control law, pilot skill, and energy-management discipline.

Which has the longer combat radius?

F-4 Phantom II: 1750 mi vs 1056 mi (manufacturer-published unrefueled range; actual combat radius is typically 30-50% lower depending on weapons load and reserves).

Which has the more modern radar / avionics?

F-4 Phantom II entered service in 1961, MiG-21 in 1959. The newer-service-entry airframe usually carries a more modern radar generation, though both have received upgrades over their lifetime.

Could they realistically face each other in combat?

Both are operated by major air forces. Whether they have actually flown against each other in combat or only in exercises depends on the specific airframes and political climate. The reference pages link to documented service histories.

Is this comparison authoritative?

No. This is a spec-driven on-paper analysis. Real combat outcomes are dominated by pilot skill, training quality, doctrine, tactics, ground-controlled-intercept support, electronic warfare, and weapons-loadout choices — none of which appear in the public spec sheet. Treat this as a starting point for further research, not a verdict.

Sources

Spec values pulled from each aircraft's reference page in the gallery, which aggregates manufacturer-published figures with Wikipedia-cited sources:

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